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Author Topic: 2016 sea ice area and extent data  (Read 492296 times)

Jim Pettit

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Re: 2016 sea ice area and extent data
« Reply #150 on: April 16, 2016, 02:13:05 PM »
ADS-NIPR Extent:
13,134,117 km2 (15 April)
Down 808,390 km2 (5.8%) from 2016 maximum of 13,942,507 km2 on 29 February.
9,956,662 km2 above record minimum extent of 3,177,455 km2 (16 September 2012).
Down 23,553 km2 (-.18%) from previous day.
Down 103,595 km2  (-.78%) over past seven days (daily average: -14,799 km2).
Down 362,083 km2  (-2.96%) for April (daily average: -24,139 km2).
586,567 km2 below 2000s average for this date.
477,945 km2 below 2010s average for this date.
221,042 km2 below 2015 value for this date.
916,413 km2 below 2012 value for this date.
Lowest year-to-date (01 January - 15 April) average.
Lowest April to-date average.
Lowest value for the date.
51 days this year (48.57% year-to-date) have recorded the lowest daily extent.
27 days (25.71%) have recorded the second lowest.
14 days (13.33%) have recorded the third lowest.
92 days in total (87.62%) have been among the lowest three on record.

Jim Pettit

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Re: 2016 sea ice area and extent data
« Reply #151 on: April 19, 2016, 12:59:14 PM »
ADS-NIPR Extent:
12,996,593 km2 (18 April)
NOTE: Earliest sub-13 million km2 reading on record.
Down 945,914 km2 (6.78%) from 2016 maximum of 13,942,507 km2 on 29 February.
9,819,138 km2 above record minimum extent of 3,177,455 km2 (16 September 2012).
Down 62,543 km2 (-.48%) from previous day.
Down 122,288 km2  (-.93%) over past seven days (daily average: -17,470 km2).
Down 499,607 km2  (-4.08%) for April (daily average: -27,756 km2).
607,644 km2 below 2000s average for this date.
498,748 km2 below 2010s average for this date.
347,023 km2 below 2015 value for this date.
967,833 km2 below 2012 value for this date.
Lowest year-to-date (01 January - 18 April) average.
Lowest April to-date average.
Lowest value for the date.
54 days this year (50% year-to-date) have recorded the lowest daily extent.
27 days (25%) have recorded the second lowest.
14 days (12.96%) have recorded the third lowest.
95 days in total (87.96%) have been among the lowest three on record.

jdallen

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Re: 2016 sea ice area and extent data
« Reply #152 on: April 19, 2016, 03:10:56 PM »
ADS-NIPR Extent:
<<< snippage >>>
967,833 km2 below 2012 value for this date.
Lowest year-to-date (01 January - 18 April) average.
<<< snippage >>>
95 days in total (87.96%) have been among the lowest three on record.
Worth noting, between now and minimum in 2012, the Arctic shed 10.78 million KM2 of ice.
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AmbiValent

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Re: 2016 sea ice area and extent data
« Reply #153 on: April 19, 2016, 03:22:10 PM »
The CT area anomaly seems to have gone back to pre-hiccup levels. Is there any indication when CT area accuracy will be completely repaired?
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Wipneus

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Re: 2016 sea ice area and extent data
« Reply #154 on: April 19, 2016, 04:16:17 PM »
The CT area anomaly seems to have gone back to pre-hiccup levels. Is there any indication when CT area accuracy will be completely repaired?

CT area is derived from NSIDC concentration, same as NSIDC's own sea ice index (extent).

Problems seem to be much reduced for the last couple of days. In the latest data, released yesterday, only in the Japanese and Yellow Seas there is some pattern of suspicious ice. On the other hand there may be other problems there ( bad weather) having nothing to do with the sensor failure.

We will have to wait until NSIDC completes their investigation.

Wipneus

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Re: 2016 sea ice area and extent data
« Reply #155 on: April 20, 2016, 02:04:48 PM »
NSIDC confirms that the situation has improved/restored (hat tip to Michael Yorke ):

Quote
Notice (04/05/2016): Notice (04/19/2016): Daily sea ice concentration updates have improved. On 04/05/2016 a change in the solar panel position to shade the nitrogen tank on board the Defense Meteorological Satellite Program (DMSP) F-17 satellite was made. In doing so, the integrity of the vertically polarized 37 GHz channel (37V) of the Special Sensor Microwave Imager and Sounder (SSMIS) was compromised. This is a primary channel used in the sea ice processing. On 04/13/16 an additional change in the solar panel position was made.This change has improved the problems we were seeing in the 37V GHz channel. The affected daily files from 04/05 – 04/13 have been removed from distribution.

(Colored by NSIDC ).

https://nsidc.org/data/nsidc-0081

Jim Pettit

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Re: 2016 sea ice area and extent data
« Reply #156 on: April 20, 2016, 02:24:10 PM »
NSIDC confirms that the situation has improved/restored (hat tip to Michael Yorke ):

Quote
Notice (04/05/2016): Notice (04/19/2016): Daily sea ice concentration updates have improved. On 04/05/2016 a change in the solar panel position to shade the nitrogen tank on board the Defense Meteorological Satellite Program (DMSP) F-17 satellite was made. In doing so, the integrity of the vertically polarized 37 GHz channel (37V) of the Special Sensor Microwave Imager and Sounder (SSMIS) was compromised. This is a primary channel used in the sea ice processing. On 04/13/16 an additional change in the solar panel position was made.This change has improved the problems we were seeing in the 37V GHz channel. The affected daily files from 04/05 – 04/13 have been removed from distribution.

(Colored by NSIDC ).

https://nsidc.org/data/nsidc-0081

That's great news. Now, will CT also remove their SIA data from 04/05 - 04/13? Or, more accurately, 04/07 through 04/15?

Neven

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Re: 2016 sea ice area and extent data
« Reply #157 on: April 20, 2016, 02:37:06 PM »
This is great! I thought the sensor had failed, but apparently it was because of that solar panel.
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TerryM

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Re: 2016 sea ice area and extent data
« Reply #158 on: April 20, 2016, 05:02:29 PM »
From Jim Pettit's outstanding SIA chart, it seems as though it's never taken more than 26 days to blow through the 11M ice, and in many years 13 days sufficed. We are starting far earlier than in the past so the sun will be at a lower angel and we'll have less insolation than in the past. It is however approximately the same regions of ice that will be melting.
DMI shows that north of 80 has still never cooled off to 'normal' levels. 110 days of April like weather since Jan 1. If this softer, warmer, more mobile ice melts as rapidly as it has in past years we could be in for a record setting September.


Terry

Jim Pettit

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Re: 2016 sea ice area and extent data
« Reply #159 on: April 21, 2016, 02:23:13 PM »
ADS-NIPR Extent:
12,877,955 km2 (20 April)
Down 1,064,552 km2 (7.64%) from 2016 maximum of 13,942,507 km2 on 29 February.
9,700,500 km2 above record minimum extent of 3,177,455 km2 (16 September 2012).
Down 50,162 km2 (-.39%) from previous day.
Down 301,885 km2  (-2.29%) over past seven days (daily average: -43,126 km2).
Down 618,245 km2  (-5.05%) for April (daily average: -30,912 km2).
677,457 km2 below 2000s average for this date.
545,834 km2 below 2010s average for this date.
415,001 km2 below 2015 value for this date.
1,054,059 km2 below 2012 value for this date.
Lowest year-to-date (01 January - 20 April) average.
Lowest April to-date average.
Lowest value for the date.
56 days this year (50.91% year-to-date) have recorded the lowest daily extent.
27 days (24.55%) have recorded the second lowest.
14 days (12.73%) have recorded the third lowest.
97 days in total (88.18%) have been among the lowest three on record.


CT Area:
12,125,451 km2 (20 April [Day 0.2986])
Down 795,907 km2 (6.16%) from 2016 maximum of 12,921,358 km2 on 29 March [Day 0.2384].
9,891,442 km2 above record minimum area of 2,234,010 km2 (14 September 2012).
Down 75,161 km2 (-.62%) from previous day.
Down 276,489 km2 (-2.48%) for April (daily average: -13,824 km2).
523,272 km2 below 2000s average for this date.
450,561 km2 below 2010s average for this date.
400,946 km2 below 2015 value for this date.
888,195 km2 below 2012 value for this date.
Lowest year-to-date (Day 0.0000 - Day 0.2986) average.
Lowest April to-date average.
Lowest value for the date.
61 days this year (60.4% year-to-date) have recorded the lowest daily area.
19 days (18.81%) have recorded the second lowest.
11 days (10.89%) have recorded the third lowest.
91 days in total (90.1%) have been among the lowest three on record.

Wipneus

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Re: 2016 sea ice area and extent data
« Reply #160 on: April 22, 2016, 07:55:15 AM »
The problems have resurfaced again:

Quote
Notice (04/21/2016): On 04/05/2016 a change in the solar panel position to shade the nitrogen tank on board the Defense Meteorological Satellite Program (DMSP) F-17 satellite was made. In doing so, the integrity of the vertically polarized 37 GHz channel (37V) of the Special Sensor Microwave Imager and Sounder (SSMIS) was compromised. On 04/13/16 an additional change in the solar panel position was made. This change had improved the problems we were seeing in the 37V GHz channel for data from April 13 to April 19; however, on April 20, the 37V GHz channel started to produce bad data again. Thus, data from April 20 onward should not be used until further notice. The affected daily files from 04/05 – 04/13 have been removed from distribution.

(color by NSIDC)


Jim Pettit

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Re: 2016 sea ice area and extent data
« Reply #161 on: April 22, 2016, 02:44:05 PM »
Assuming the -128k drop in CT SIA stands--and there's no reason it shouldn't--2016 area fell below 12 million the earliest it ever has. In fact, this year's SIA fell below 12 million on the same day--0.3014--that 2012 fell below 13 million. Of course, one of the things that helped 2012 break the record was losing more than 1 million km2 over the next two weeks; it will be Very Interesting to see whether this year can maintain its huge lead...


Jim Pettit

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Re: 2016 sea ice area and extent data
« Reply #162 on: April 23, 2016, 02:27:33 PM »
CT SIA's numbers are way off again today, showing a one-day increase of 1.387 million km2, and setting a new annual maximum nearly 400k higher than what it was.

Sigh...

Oh well, at least we got six days of accurate and usable  numbers in the past two-and-a-half weeks. I think.  ::)

In the meantime:

ADS-NIPR Extent:
12,747,752 km2 (22 April)
Down 1,194,755 km2 (8.57%) from 2016 maximum of 13,942,507 km2 on 29 February.
9,570,297 km2 above record minimum extent of 3,177,455 km2 (16 September 2012).
Down 89,382 km2 (-.7%) from previous day.
Down 386,365 km2  (-2.94%) over past seven days (daily average: -55,195 km2).
Down 748,448 km2  (-6.12%) for April (daily average: -34,020 km2).
745,950 km2 below 2000s average for this date.
624,417 km2 below 2010s average for this date.
554,843 km2 below 2015 value for this date.
1,102,009 km2 below 2012 value for this date.
Lowest year-to-date (01 January - 22 April) average.
Lowest April to-date average.
Lowest value for the date.
58 days this year (51.79% year-to-date) have recorded the lowest daily extent.
27 days (24.11%) have recorded the second lowest.
14 days (12.5%) have recorded the third lowest.
99 days in total (88.39%) have been among the lowest three on record.

Tor Bejnar

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Re: 2016 sea ice area and extent data
« Reply #163 on: April 23, 2016, 04:48:58 PM »
CT SIA's numbers are ... setting a new annual maximum nearly 400k higher than what it was.
...
That's the best news I've heard all year!   ;D
(Because this didn't actually happen, I need to go for a walk by the sea or in a forest or through a desert, and breathe.  Heck, we should all do that!)
Arctic ice is healthy for children and other living things.

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Re: 2016 sea ice area and extent data
« Reply #164 on: April 23, 2016, 10:58:45 PM »
Quote
1,102,009 km2 below 2012 value for this date.

Frigging incredible....... :o
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Jim Pettit

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Re: 2016 sea ice area and extent data
« Reply #165 on: April 25, 2016, 04:21:57 PM »
ADS-NIPR Extent:
12,633,672 km2 (24 April)
Down 1,308,835 km2 (9.39%) from 2016 maximum of 13,942,507 km2 on 29 February.
9,456,217 km2 above record minimum extent of 3,177,455 km2 (16 September 2012).
Down 48,001 km2 (-.38%) from previous day.
Down 425,464 km2  (-3.26%) over past seven days (daily average: -60,781 km2).
Down 862,528 km2  (-7.05%) for April (daily average: -35,939 km2).
768,978 km2 below 2000s average for this date.
619,682 km2 below 2010s average for this date.
476,522 km2 below 2015 value for this date.
1,033,249 km2 below 2012 value for this date.
Lowest year-to-date (01 January - 24 April) average.
Lowest April to-date average.
Lowest value for the date.
60 days this year (52.63% year-to-date) have recorded the lowest daily extent.
27 days (23.68%) have recorded the second lowest.
14 days (12.28%) have recorded the third lowest.
101 days in total (88.6%) have been among the lowest three on record.


CT Area:
11,817,238 km2 (24 April [Day 0.3096])
Down 1,104,120 km2 (8.54%) from 2016 maximum of 12,921,358 km2 on 29 March [Day 0.2384].
9,583,228 km2 above record minimum area of 2,234,010 km2 (14 September 2012).
724,800 km2 below 2000s average for this date.
600,173 km2 below 2010s average for this date.
513,767 km2 below 2015 value for this date.
1,113,250 km2 below 2012 value for this date.
Lowest year-to-date (Day 0.0000 - Day 0.3096) average.
Lowest April to-date average.
Lowest value for the date.
63 days this year (61.17% year-to-date) have recorded the lowest daily area.
19 days (18.45%) have recorded the second lowest.
11 days (10.68%) have recorded the third lowest.
93 days in total (90.29%) have been among the lowest three on record.




jdallen

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Re: 2016 sea ice area and extent data
« Reply #166 on: April 25, 2016, 06:53:23 PM »
CT Area:
11,817,238 km2 (24 April [Day 0.3096])
Down 1,104,120 km2 (8.54%) from 2016 maximum of 12,921,358 km2 on 29 March [Day 0.2384].
9,583,228 km2 above record minimum area of 2,234,010 km2 (14 September 2012).
724,800 km2 below 2000s average for this date.
600,173 km2 below 2010s average for this date.
513,767 km2 below 2015 value for this date.
1,113,250 km2 below 2012 value for this date.
If this year follows 2012's trajectory, we would be within a couple 100,000KM2 of dropping under 2 million KM2 extent and 1 million KM2 of area.

Letting that sink in now.
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Jim Pettit

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Re: 2016 sea ice area and extent data
« Reply #167 on: April 25, 2016, 07:37:06 PM »
CT Area:
11,817,238 km2 (24 April [Day 0.3096])
Down 1,104,120 km2 (8.54%) from 2016 maximum of 12,921,358 km2 on 29 March [Day 0.2384].
9,583,228 km2 above record minimum area of 2,234,010 km2 (14 September 2012).
724,800 km2 below 2000s average for this date.
600,173 km2 below 2010s average for this date.
513,767 km2 below 2015 value for this date.
1,113,250 km2 below 2012 value for this date.
If this year follows 2012's trajectory, we would be within a couple 100,000KM2 of dropping under 2 million KM2 extent and 1 million KM2 of area.

Letting that sink in now.

Correct. More precisely, were the rest of 2016's melt season to follow 2012 exactly, this year would sea a mid-September low of 1,120,760 km2.

Phil.

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Re: 2016 sea ice area and extent data
« Reply #168 on: April 25, 2016, 07:53:02 PM »
Assuming the -128k drop in CT SIA stands--and there's no reason it shouldn't--2016 area fell below 12 million the earliest it ever has. In fact, this year's SIA fell below 12 million on the same day--0.3014--that 2012 fell below 13 million. Of course, one of the things that helped 2012 break the record was losing more than 1 million km2 over the next two weeks; it will be Very Interesting to see whether this year can maintain its huge lead...


Looks pretty close to the timing in 2007?

Neven

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Re: 2016 sea ice area and extent data
« Reply #169 on: April 25, 2016, 08:09:12 PM »
test

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Neven

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Re: 2016 sea ice area and extent data
« Reply #170 on: April 25, 2016, 08:15:23 PM »
It's strange. That ADS-NIPR JAXA SIE graph no longer appears on the front page of the ASIG, but I haven't changed anything and all the HTML is as it's supposed to be. As you can see in the comment above I can link to the image and it shows up.

Does anyone have a clue why this is? Given that the JAXA graph is one of the few that is still working properly, I'd really like to have it back on the ASIG.
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crandles

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Re: 2016 sea ice area and extent data
« Reply #171 on: April 25, 2016, 08:17:18 PM »
It's strange. That ADS-NIPR JAXA SIE graph no longer appears on the front page of the ASIG, but I haven't changed anything and all the HTML is as it's supposed to be. As you can see in the comment above I can link to the image and it shows up.

Does anyone have a clue why this is? Given that the JAXA graph is one of the few that is still working properly, I'd really like to have it back on the ASIG.

Displaying on graphs page for me. (As well as here 2 posts above.)

Neven

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Re: 2016 sea ice area and extent data
« Reply #172 on: April 25, 2016, 08:23:50 PM »
Displaying on graphs page for me. (As well as here 2 posts above.)

Really? That's good, as it means that probably most people can see it.

But why just me?  :'( ;)

It's not a browser issue, as both Chrome and Firefox aren't showing it for me. Could it be an IP issue and the Japanese have banned me because I accessed the image too often? I'm going to try and check that now (using VPN).
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doogi

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Re: 2016 sea ice area and extent data
« Reply #173 on: April 25, 2016, 09:16:22 PM »
Displaying on graphs page for me. (As well as here 2 posts above.)

Really? That's good, as it means that probably most people can see it.

But why just me?  :'( ;)

It's not a browser issue, as both Chrome and Firefox aren't showing it for me. Could it be an IP issue and the Japanese have banned me because I accessed the image too often? I'm going to try and check that now (using VPN).

I can't see it, neither here or on ASIG.
I do however se it if i take the url in your post #169 (wich i can see when i press quote) and paste it in a new window.


Edit:
I belive it's an adblock issue, everything works fine when i disable adblock.
« Last Edit: April 25, 2016, 09:22:45 PM by doogi »

Neven

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Re: 2016 sea ice area and extent data
« Reply #174 on: April 25, 2016, 09:47:28 PM »
This must be the annual 'Neven thinks there's something wrong, but it's just his bloody Adblocker'-moment. I think this is the third time now this has happened to me. And I'm only 42.

Thanks, doogi! That did the trick!
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OldLeatherneck

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Re: 2016 sea ice area and extent data
« Reply #175 on: April 26, 2016, 02:25:54 AM »
This must be the annual 'Neven thinks there's something wrong, but it's just his bloody Adblocker'-moment. I think this is the third time now this has happened to me. And I'm only 42.

Thanks, doogi! That did the trick!

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Re: 2016 sea ice area and extent data
« Reply #176 on: April 26, 2016, 06:00:40 PM »
DMSP F17 troubles are still there (nearly a millennium jump in extent today). OSI-SAF reports that the changeover to the F18 is now complete including reprocessing of the sea ice concentration product.

Quote
The OSI SAF continuous reprocessed sea ice concentration offline product
(OSI-430) is back to nominal production and distribution, now with SSMIS
data from DMSP F18. Production has been rerun with SSMIS F18 data to cover
the missing dates since 13th April, and all data are available on our ftp
server ftp://osisaf.met.no/reprocessed/ice/conc-cont-reproc/v1p2/2016/03/


sedziobs

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Re: 2016 sea ice area and extent data
« Reply #177 on: April 26, 2016, 06:22:35 PM »
DMSP F17 troubles are still there (nearly a millennium jump in extent today). OSI-SAF reports that the changeover to the F18 is now complete including reprocessing of the sea ice concentration product.

According to Robert Grumbine, there are some issues with F18.  He notes that the satellite instruments are designed for a 5 year lifespan, which both the F-17 and F-18 have already exceeded.  In a summary of all the satellites he says:
Quote
F-17 is/was widely used, so many places are having difficulty.  F-18 has a very bad channel at 150 GHz, but the other imaging channels seem to be ok.  F-19 should be the best of the group, being the youngest, but quit providing data.
Quote
F-18: Mostly ok, but reduced volume of data.  Many orbits' data not making it through.
http://moregrumbinescience.blogspot.com/2016/04/2016-tough-on-sea-ice-satellites.html

Jim Pettit

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Re: 2016 sea ice area and extent data
« Reply #178 on: April 29, 2016, 02:12:35 PM »
ADS-NIPR Extent:
12,413,834 km2 (28 April)
Down 1,528,673 km2 (10.96%) from 2016 maximum of 13,942,507 km2 on 29 February.
9,236,379 km2 above record minimum extent of 3,177,455 km2 (16 September 2012).
Down 85,164 km2 (-.68%) from previous day.
Down 423,300 km2  (-3.3%) over past seven days (daily average: -60,471 km2).
Down 1,082,366 km2  (-8.85%) for April (daily average: -38,656 km2).
811,314 km2 below 2000s average for this date.
580,259 km2 below 2010s average for this date.
401,936 km2 below 2015 value for this date.
876,780 km2 below 2012 value for this date.
Lowest year-to-date (01 January - 28 April) average.
Lowest April to-date average.
Lowest value for the date.
64 days this year (54.24% year-to-date) have recorded the lowest daily extent.
27 days (22.88%) have recorded the second lowest.
14 days (11.86%) have recorded the third lowest.
105 days in total (88.98%) have been among the lowest three on record.


CT Area:
11,547,403 km2 (28 April [Day 0.3206])
Down 1,373,955 km2 (10.63%) from 2016 maximum of 12,921,358 km2 on 29 March [Day 0.2384].
9,313,394 km2 above record minimum area of 2,234,010 km2 (14 September 2012).
Down 502,439 km2 (-4.51%) for April (daily average: -17,944 km2).
795,909 km2 below 2000s average for this date.
587,385 km2 below 2010s average for this date.
437,383 km2 below 2015 value for this date.
1,103,418 km2 below 2012 value for this date.
Lowest year-to-date (Day 0.0000 - Day 0.3206) average.
Lowest April to-date average.
Lowest value for the date.
66 days this year (62.26% year-to-date) have recorded the lowest daily area.
19 days (17.92%) have recorded the second lowest.
11 days (10.38%) have recorded the third lowest.
96 days in total (90.57%) have been among the lowest three on record.


Jim Pettit

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Re: 2016 sea ice area and extent data
« Reply #179 on: May 03, 2016, 02:23:00 PM »
ADS-NIPR Extent:
12,164,312 km2 (02 May)
Down 1,778,195 km2 (12.75%) from 2016 maximum of 13,942,507 km2 on 29 February.
8,986,857 km2 above record minimum extent of 3,177,455 km2 (16 September 2012).
Down 31,101 km2 (-.26%) from previous day.
Down 431,506 km2  (-3.43%) over past seven days (daily average: -61,644 km2).
Down 129,135 km2  (-1.06%) for May (daily average: -64,568 km2).
895,110 km2 below 2000s average for this date.
606,596 km2 below 2010s average for this date.
470,584 km2 below 2015 value for this date.
849,792 km2 below 2012 value for this date.
Lowest year-to-date (01 January - 02 May) average.
Lowest May to-date average.
Lowest value for the date.
68 days this year (55.74% year-to-date) have recorded the lowest daily extent.
27 days (22.13%) have recorded the second lowest.
14 days (11.48%) have recorded the third lowest.
109 days in total (89.34%) have been among the lowest three on record.


CT Area:
11,320,857 km2 (02 May [Day 0.3315])
Down 1,600,501 km2 (12.39%) from 2016 maximum of 12,921,358 km2 on 29 March [Day 0.2384].
9,086,848 km2 above record minimum area of 2,234,010 km2 (14 September 2012).
866,183 km2 below 2000s average for this date.
578,520 km2 below 2010s average for this date.
676,849 km2 below 2015 value for this date.
875,744 km2 below 2012 value for this date.
Lowest year-to-date (Day 0.0000 - Day 0.3315) average.
Lowest May to-date average.
Lowest value for the date.
At least 67* days this year have recorded the lowest daily area.
At least 19* days have recorded the second lowest.
At least 11* days have recorded the third lowest.
At least 97* days in total have been among the lowest three on record.
* - Multiple days in the Cryosphere Today 2016 data are missing and/or invalid; for that reason, they are not represented in these sums.
« Last Edit: May 03, 2016, 05:10:14 PM by Jim Pettit »

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Re: 2016 sea ice area and extent data
« Reply #180 on: May 03, 2016, 04:25:10 PM »
ADS-NIPR Extent:
109 days in total (89.34%) have been among the lowest three on record.


CT Area:
97 days in total (90.65%) have been among the lowest three on record.

Thanks for these updates. I am just curious about the different number of days between these two data sets. Do you only have CT Area info for a subset of the year, so those 97 days constitutes a greater percentage (90.65%) of the recorded days, vs the 109 days of the Extent data (which only come up to 89.34%)?

Thanks

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Re: 2016 sea ice area and extent data
« Reply #181 on: May 03, 2016, 05:10:59 PM »
ADS-NIPR Extent:
109 days in total (89.34%) have been among the lowest three on record.


CT Area:
97 days in total (90.65%) have been among the lowest three on record.

Thanks for these updates. I am just curious about the different number of days between these two data sets. Do you only have CT Area info for a subset of the year, so those 97 days constitutes a greater percentage (90.65%) of the recorded days, vs the 109 days of the Extent data (which only come up to 89.34%)?

Thanks

Thanks. Note the edits to the previous post.

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Re: 2016 sea ice area and extent data
« Reply #182 on: May 03, 2016, 05:33:56 PM »
Quote
Note the edits to the previous post.
Thanks, Jim, for the explanation.
Arctic ice is healthy for children and other living things.

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Re: 2016 sea ice area and extent data
« Reply #183 on: May 03, 2016, 05:42:56 PM »

Thanks for these updates. I am just curious about the different number of days between these two data sets.

hehe... thought the same days ago but was afraid to ask, thought i just missed an important point that would be obvious :-) thanks for asking and

thanks @Jim Pettit for the prompt and accurate explanation  8)

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Re: 2016 sea ice area and extent data
« Reply #184 on: May 04, 2016, 08:39:17 AM »
From NSIDC data announcements, it will take a minimum of two months until sea ice concentration and sea ice index will be updating regularly again:

Quote
Sea Ice Index Processing Suspended
May 3, 2016   

The Sea Ice Index is typically updated every day to display yesterday’s ice extent for both hemispheres. The Index relies on data that come from the DMSP F17 satellite. However, these data have not been reliable since early April; so the NOAA@NSIDC team has not been able to update the Sea Ice Index since 31 March 2016.

Sea Ice Index processing uses an NSIDC NASA DAAC product, Near-Real-Time DMSP SSMIS Daily Polar Gridded Sea Ice Concentrations (NSIDC-0081), as input. The NSIDC DAAC has started the work needed to move to a new source for NSIDC-0081. This involves retrieving F18 and F16 satellite brightness temperatures from our data providers and then implementing parallel processing for ice concentration to determine which satellite will be best suited to continue the time series. The satellite selected will be the primary replacement for F17, but should that satellite fail, we will be able to switch to the other one without a service interruption.

An interim version of the NSIDC-0081 data stream will be used for the ASINA product, which is based on the Sea Ice Index, to continue to report on sea ice conditions. However, the Sea Ice Index processing itself will not resume until a version of NSIDC-0081 is available that is vetted by the science team. It is not known how long this will take, but we expect it will be a minimum of two months before NSIDC-0081 is updating regularly again with a new vetted source and the Sea Ice Index is processing that new input.

Users may want to explore daily arctic-wide ice extent from the NIC/NSIDC MASIE product as an alternative product for the Northern Hemisphere. The MASIE ice extent record is not consistent with that from the Sea Ice Index, however, nor is it necessarily internally consistent. See the MASIE documentation in order to gain a better understanding of how the product is created.

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Re: 2016 sea ice area and extent data
« Reply #185 on: May 04, 2016, 10:30:29 AM »

Thanks for these updates. I am just curious about the different number of days between these two data sets.

hehe... thought the same days ago but was afraid to ask, thought i just missed an important point that would be obvious :-) thanks for asking and

thanks @Jim Pettit for the prompt and accurate explanation  8)
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Re: 2016 sea ice area and extent data
« Reply #186 on: May 04, 2016, 02:13:07 PM »
From NSIDC data announcements, it will take a minimum of two months until sea ice concentration and sea ice index will be updating regularly again:

Quote
Sea Ice Index Processing Suspended
May 3, 2016   

The Sea Ice Index is typically updated every day to display yesterday’s ice extent for both hemispheres. The Index relies on data that come from the DMSP F17 satellite. However, these data have not been reliable since early April; so the NOAA@NSIDC team has not been able to update the Sea Ice Index since 31 March 2016.

Sea Ice Index processing uses an NSIDC NASA DAAC product, Near-Real-Time DMSP SSMIS Daily Polar Gridded Sea Ice Concentrations (NSIDC-0081), as input. The NSIDC DAAC has started the work needed to move to a new source for NSIDC-0081. This involves retrieving F18 and F16 satellite brightness temperatures from our data providers and then implementing parallel processing for ice concentration to determine which satellite will be best suited to continue the time series. The satellite selected will be the primary replacement for F17, but should that satellite fail, we will be able to switch to the other one without a service interruption.

An interim version of the NSIDC-0081 data stream will be used for the ASINA product, which is based on the Sea Ice Index, to continue to report on sea ice conditions. However, the Sea Ice Index processing itself will not resume until a version of NSIDC-0081 is available that is vetted by the science team. It is not known how long this will take, but we expect it will be a minimum of two months before NSIDC-0081 is updating regularly again with a new vetted source and the Sea Ice Index is processing that new input.

Users may want to explore daily arctic-wide ice extent from the NIC/NSIDC MASIE product as an alternative product for the Northern Hemisphere. The MASIE ice extent record is not consistent with that from the Sea Ice Index, however, nor is it necessarily internally consistent. See the MASIE documentation in order to gain a better understanding of how the product is created.

Alright then. Thanks for that basketful of bad but not altogether unexpected news. Now, the press release stated it would be "a minimum of two months" before things are stabilized. So, pessimistically-speaking, we could possibly lose most--or even all--of the melt season?

Awesome... :\

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Re: 2016 sea ice area and extent data
« Reply #187 on: May 04, 2016, 03:26:02 PM »
If it is going to be 2 months perhaps we should try to get a list of products and the extent to which each is affected.

E.g. is Cryosphere area reliable? (seems like a few days affected but many OK? Or shouldn't we trust any data since early April?)
PIOMAS ??
MASIE - presume unaffected from that announcement.
Ads / NIPR (IJIS) - appears unaffected?
Uni Bremen AMSR2 - appears unaffected?
DMI Volume - appears unaffected?
DMI Extent - appears unaffected?
IMS - appears unaffected?

NSIDC Extent - data ceased til ~July
NORSEX SSM  - data ceased

Perhaps there are better ways of doing it or more useful data could be displayed like what satellite services each product uses so that if/when there is a future problem we can see which products will be affected. A separate thread with first post updated?

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Re: 2016 sea ice area and extent data
« Reply #188 on: May 05, 2016, 02:32:11 PM »
ADS-NIPR Extent:
12,081,393 km2 (04 May)
Down 1,861,114 km2 (13.35%) from 2016 maximum of 13,942,507 km2 on 29 February.
8,903,938 km2 above record minimum extent of 3,177,455 km2 (16 September 2012).
Down 63,054 km2 (-.52%) from previous day.
Down 417,605 km2  (-3.34%) over past seven days (daily average: -59,658 km2).
Down 212,054 km2  (-1.73%) for May (daily average: -53,014 km2).
881,220 km2 below 2000s average for this date.
592,392 km2 below 2010s average for this date.
507,605 km2 below 2015 value for this date.
816,381 km2 below 2012 value for this date.
Lowest year-to-date (01 January - 04 May) average.
Lowest May to-date average.
Lowest value for the date.
70 days this year (56.45% year-to-date) have recorded the lowest daily extent.
27 days (21.77%) have recorded the second lowest.
14 days (11.29%) have recorded the third lowest.
111 days in total (89.52%) have been among the lowest three on record.


CT Area:
11,021,056 km2 (04 May [Day 0.337])
NOTE: the sea ice area data shown here may be inaccurate and subject to change or deletion. Use at your own risk.
Down 1,900,302 km2 (14.71%) from 2016 maximum of 12,921,358 km2 on 29 March [Day 0.2384].
8,787,047 km2 above record minimum area of 2,234,010 km2 (14 September 2012).
Down 115,006 km2 (-1.03%) from previous day.
994,026 km2 below 2000s average for this date.
661,057 km2 below 2010s average for this date.
812,250 km2 below 2015 value for this date.
979,720 km2 below 2012 value for this date.
Lowest year-to-date (Day 0.0000 - Day 0.337) average.
Lowest May to-date average.
Lowest value for the date.
At least 69* days this year have recorded the lowest daily area.
At least 19* days have recorded the second lowest.
At least 11* days have recorded the third lowest.
At least 99* days in total have been among the lowest three on record.
* -Multiple days in the Cryosphere Today 2016 data are missing and/or invalid; for that reason, they are not represented in these sums.
« Last Edit: May 05, 2016, 02:46:53 PM by Jim Pettit »

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Re: 2016 sea ice area and extent data
« Reply #189 on: May 06, 2016, 09:31:07 AM »
It is official:

Quote
Dear colleague,

The Sea Ice Index has suspended processing due to unreliable input data. Sea Ice Index processing uses a NSIDC NASA DAAC product, Near-Real-Time DMSP SSMIS Daily Polar Gridded Sea Ice Concentrations (NSIDC-0081), as input. The NSIDC-0081 product utilizes data from the 37V channel of the DMSP F-17 satellite which is producing unreliable data. The last date available is 31 March 2016.

The NSIDC DAAC has started the work needed to move to a new data source for NSIDC-0081. An interim version of the NSIDC-0081 data stream will be available with the new data source, however Sea Ice Index processing will not resume until a calibrated version of NSIDC-0081 is available. For more information please see http://nsidc.org/the-drift/data-update/sea-ice-index-processing-suspended/

Access to the data and documentation is provided on the Sea Ice Index web site at: https://nsidc.org/data/seaice_index/

If you have questions, please contact NSIDC's User Services Office at nsidc@nsidc.org

Data Acknowledgements
Data authors: Fetterer, F., K. Knowles, W. Meier, and M. Savoie
Data set DOI:http://dx.doi.org/10.7265/N5QJ7F7W
Data center: NOAA@NSIDC (http://nsidc.org/noaa/)
Sponsor: NOAA/NESDIS/NGDC and the NOAA Arctic Research Program

Best regards,
NSIDC User Services

See also:
http://nsidc.org/the-drift/data-update/nsidc-halts-production-of-the-near-real-time-dmsp-ssmis-daily-polar-gridded-sea-ice-concentrations-f17-data/

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Re: 2016 sea ice area and extent data
« Reply #190 on: May 06, 2016, 09:38:53 AM »
The mentioned uncalibrated F18 based sea ice concentration is available now (from first of April).

I have changed my programs to make use of the new data source (and ignoring any F17 data since 1st of April). The graphs and data files have been updated accordingly.

Attached is the latest delta map.

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Re: 2016 sea ice area and extent data
« Reply #191 on: May 06, 2016, 01:21:26 PM »
CT Area:
 
11,021,056 km2 (04 May [Day 0.337])
NOTE: the sea ice area data shown here may be inaccurate and subject to change or deletion.
Quote
Use at your own risk.
Down 1,900,302 km2 (14.71%) from 2016 maximum of 12,921,358 km2 on 29 March [Day 0.2384].
8,787,047 km2 above record minimum area of 2,234,010 km2 (14 September 2012).
 
Down 115,006 km2 (-1.03%) from previous day.
994,026 km2 below 2000s average for this date.
661,057 km2 below 2010s average for this date.
812,250 km2 below 2015 value for this date.
979,720 km2 below 2012 value for this date.

Part of Jim's data is above.

For those wanting a "visual idea".  That 812,250 km2 is just under TWICE THE SIZE OF TEXAS.  That's....a LOT.

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Re: 2016 sea ice area and extent data
« Reply #192 on: May 06, 2016, 03:28:58 PM »
CT Area:
 
11,021,056 km2 (04 May [Day 0.337])
NOTE: the sea ice area data shown here may be inaccurate and subject to change or deletion.
Quote
Use at your own risk.
Down 1,900,302 km2 (14.71%) from 2016 maximum of 12,921,358 km2 on 29 March [Day 0.2384].
8,787,047 km2 above record minimum area of 2,234,010 km2 (14 September 2012).
 
Down 115,006 km2 (-1.03%) from previous day.
994,026 km2 below 2000s average for this date.
661,057 km2 below 2010s average for this date.
812,250 km2 below 2015 value for this date.
979,720 km2 below 2012 value for this date.

Part of Jim's data is above.

For those wanting a "visual idea".  That 812,250 km2 is just under TWICE THE SIZE OF TEXAS.  That's....a LOT.
On behalf of New Scientists' Feedback page can I  ask how big is that in Elephant Hides ;D
Toto, I've a feeling we're not in Kansas anymore

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Re: 2016 sea ice area and extent data
« Reply #193 on: May 06, 2016, 04:10:03 PM »
CT Area:
 
11,021,056 km2 (04 May [Day 0.337])
NOTE: the sea ice area data shown here may be inaccurate and subject to change or deletion.
Quote
Use at your own risk.
Down 1,900,302 km2 (14.71%) from 2016 maximum of 12,921,358 km2 on 29 March [Day 0.2384].
8,787,047 km2 above record minimum area of 2,234,010 km2 (14 September 2012).
 
Down 115,006 km2 (-1.03%) from previous day.
994,026 km2 below 2000s average for this date.
661,057 km2 below 2010s average for this date.
812,250 km2 below 2015 value for this date.
979,720 km2 below 2012 value for this date.

Part of Jim's data is above.

For those wanting a "visual idea".  That 812,250 km2 is just under TWICE THE SIZE OF TEXAS.  That's....a LOT.
On behalf of New Scientists' Feedback page can I  ask how big is that in Elephant Hides ;D

Using the formula S = -8.245 + 6.807H + 7.073FFC
(Estimation of the total surface area in Indian elephants (Elephas maximus indicus) Sreekumar / Nirmalan et al), it's calculated that an average pachyderm has a surface area of about 20 square meters. Thus, (812,250 km2 / 1,000,000) / 20 = 40,612,500,000, or 40.6125 billion elephants.
« Last Edit: May 06, 2016, 04:20:08 PM by Jim Pettit »

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Re: 2016 sea ice area and extent data
« Reply #194 on: May 06, 2016, 04:11:13 PM »
812,000 km2 is about 20% bigger than Texas. But it's still a hell of a lot -- very nearly twice the size of California.

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Re: 2016 sea ice area and extent data
« Reply #195 on: May 06, 2016, 04:42:35 PM »


Quote
812,000 km2 is about 20% bigger than Texas. But it's still a hell of a lot -- very nearly twice the size of California.

"User error" when inputting the numbers.  I HATE THAT when that happens.  Good catch, my bad...thanks

And yes...it is still "big"...


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Re: 2016 sea ice area and extent data
« Reply #196 on: May 06, 2016, 11:07:28 PM »
CT Area:
 
11,021,056 km2 (04 May [Day 0.337])
NOTE: the sea ice area data shown here may be inaccurate and subject to change or deletion.
Quote
Use at your own risk.
Down 1,900,302 km2 (14.71%) from 2016 maximum of 12,921,358 km2 on 29 March [Day 0.2384].
8,787,047 km2 above record minimum area of 2,234,010 km2 (14 September 2012).
 
Down 115,006 km2 (-1.03%) from previous day.
994,026 km2 below 2000s average for this date.
661,057 km2 below 2010s average for this date.
812,250 km2 below 2015 value for this date.
979,720 km2 below 2012 value for this date.

Part of Jim's data is above.

For those wanting a "visual idea".  That 812,250 km2 is just under TWICE THE SIZE OF TEXAS.  That's....a LOT.
On behalf of New Scientists' Feedback page can I  ask how big is that in Elephant Hides ;D

Using the formula S = -8.245 + 6.807H + 7.073FFC
(Estimation of the total surface area in Indian elephants (Elephas maximus indicus) Sreekumar / Nirmalan et al), it's calculated that an average pachyderm has a surface area of about 20 square meters. Thus, (812,250 km2 / 1,000,000) / 20 = 40,612,500,000, or 40.6125 billion elephants.

Oh sure. You use the smaller Indian elephant to exaggerate the problem.  >:(

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Re: 2016 sea ice area and extent data
« Reply #197 on: May 07, 2016, 12:35:40 AM »
CT Area:
 
11,021,056 km2 (04 May [Day 0.337])
NOTE: the sea ice area data shown here may be inaccurate and subject to change or deletion.
Quote
Use at your own risk.
Down 1,900,302 km2 (14.71%) from 2016 maximum of 12,921,358 km2 on 29 March [Day 0.2384].
8,787,047 km2 above record minimum area of 2,234,010 km2 (14 September 2012).
 
Down 115,006 km2 (-1.03%) from previous day.
994,026 km2 below 2000s average for this date.
661,057 km2 below 2010s average for this date.
812,250 km2 below 2015 value for this date.
979,720 km2 below 2012 value for this date.

Part of Jim's data is above.

For those wanting a "visual idea".  That 812,250 km2 is just under TWICE THE SIZE OF TEXAS.  That's....a LOT.
On behalf of New Scientists' Feedback page can I  ask how big is that in Elephant Hides ;D

Using the formula S = -8.245 + 6.807H + 7.073FFC
(Estimation of the total surface area in Indian elephants (Elephas maximus indicus) Sreekumar / Nirmalan et al), it's calculated that an average pachyderm has a surface area of about 20 square meters. Thus, (812,250 km2 / 1,000,000) / 20 = 40,612,500,000, or 40.6125 billion elephants.

Oh sure. You use the smaller Indian elephant to exaggerate the problem.  >:(

Hey, don't blame me; 'twas Sreekumar & Nirmalan who wrote the paper.They're obviously part of the dark-money Worldwide Elephant Hide Area Comparsion cabal. Bastards...

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Re: 2016 sea ice area and extent data
« Reply #198 on: May 07, 2016, 01:30:35 AM »


Hey, don't blame me; 'twas Sreekumar & Nirmalan who wrote the paper.They're obviously part of the dark-money Worldwide Elephant Hide Area Comparsion cabal. Bastards...

Ahhhhhhh, yes, the Elephanati.
Paid Insane Murdoch Drone

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Re: 2016 sea ice area and extent data
« Reply #199 on: May 07, 2016, 03:27:51 PM »
ADS-NIPR Extent:
11,986,358 km2 (06 May)
NOTE: Earliest sub-12M reading by six days; ahead of ten-year average by > 13 days
Down 1,956,149 km2 (14.03%) from 2016 maximum of 13,942,507 km2 on 29 February.
8,808,903 km2 above record minimum extent of 3,177,455 km2 (16 September 2012).
Down 52,727 km2 (-.44%) from previous day.
Down 361,622 km2  (-2.93%) over past seven days (daily average: -51,660 km2).
Down 307,089 km2  (-2.51%) for May (daily average: -51,182 km2).
871,517 km2 below 2000s average for this date.
591,431 km2 below 2010s average for this date.
438,752 km2 below 2015 value for this date.
838,282 km2 below 2012 value for this date.
Lowest year-to-date (01 January - 06 May) average.
Lowest May to-date average.
Lowest value for the date.
72 days this year (57.14% year-to-date) have recorded the lowest daily extent.
27 days (21.43%) have recorded the second lowest.
14 days (11.11%) have recorded the third lowest.
113 days in total (89.68%) have been among the lowest three on record.