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Messages - Watching_from_Canberra

Pages: [1] 2
1
Arctic sea ice / Re: Arctic Image of the Day
« on: August 24, 2020, 12:23:53 PM »

2
Antarctica / Re: Weddell Sea Polynya Opening
« on: October 11, 2017, 12:41:43 PM »
I saw this mentioned in a tweet on my timeline today:
https://twitter.com/ConnorSouthard/status/917755027275513857

One of the comments referred to the following article:
https://m.phys.org/news/2017-09-antarctica-weddell-polynya-kiel-climate.html

3
Arctic sea ice / Re: IJIS
« on: August 18, 2017, 06:56:39 AM »
Is the global extent graph new?
https://ads.nipr.ac.jp/vishop/#/extent

4
Antarctica / Re: Sea Ice Extent around Antarctica
« on: August 02, 2017, 07:17:51 AM »
An oddity ? - will it persist?

Well, according to JAXA, Antarctic extent has dropped more in the last 2 days than Arctic extent!

5
Arctic sea ice / Re: The 2017 melting season
« on: August 02, 2017, 06:47:28 AM »
Would you believe JAXA is also showing that the Antarctic extent has dropped more in the last 2 days than the Arctic??  (Sorry - a bit OT.)

6
Arctic sea ice / Re: What the Buoys are telling
« on: June 30, 2017, 09:55:57 AM »
Just looking at the OB14 pitch and roll graphs:
http://obuoy.datatransport.org/monitor#buoy14/gps

Pitch fluctuates by up to 10 degrees, generally returning to zero.  Roll is only fluctuating by fractions of a degree around an average that is changing slightly.  Seems odd for one to vary by significantly more than the other.  Thoughts?  Malfunctioning sensors?

7
Arctic sea ice / Re: What the Buoys are telling
« on: June 25, 2017, 10:58:52 AM »
I am waiting fora clearer view of what we are seeing there, but I have noticed a darker area to the right and another further away to the left which are not shadows and have become more pronounced over the last 12h. Now a bear footprint has become darker as well, I think this is water accumulating on the ice surface which makes the water logged snow transparent and therefore appear dark as the underlying sea.

The ice in that area last year looks fairly broken up on Worldview.  OB14 might be on the move again soon...

8
Arctic sea ice / Re: What the Buoys are telling
« on: June 15, 2017, 12:18:04 PM »
Wow - it sure looks like footprints.  Bear?

9
Arctic sea ice / Re: What the Buoys are telling
« on: May 30, 2017, 03:02:40 PM »
The attached image is from Worldview, 28 May.  OB14 is roughly in the centre of the image.  There do seem to be some largish cracks developing in the area.

10
Arctic sea ice / Re: What the Buoys are telling
« on: May 03, 2017, 10:44:41 AM »
Look, a UFO!  :P


11
Arctic sea ice / Re: IJIS
« on: March 19, 2017, 11:36:36 AM »
IJIS:

...and lowest measured for the date.

It looks like the lowest recorded for any day between 18 Feb and 31 March.  That's just from looking at the graph, not the data.

12
Arctic sea ice / Re: What the Buoys are telling
« on: March 16, 2017, 09:20:01 AM »
What's the second colour on the battery graph?  Lithium batteries starting to take charge?
http://obuoy.datatransport.org/monitor#buoy14/batteries

13
Arctic sea ice / Re: The 2016/2017 freezing season
« on: March 06, 2017, 10:31:07 AM »
Major drain for Arctic Sea ice is unplugged.
Er, is that the Nares Strait flowing free of ice about 3 months earlier than usual?  In fact, if you scroll back in time, it actually opened up almost that much between 29 January and 3 Feb. :o

14
Arctic sea ice / Re: What the Buoys are telling
« on: February 21, 2017, 03:57:32 PM »
Location of OB14 is evident from the project page (posted previously in this thread):

http://obuoy.datatransport.org/monitor#overview/gpstracks

15
Arctic sea ice / Re: What the Buoys are telling
« on: February 21, 2017, 07:43:44 AM »
OB14 seems to be in the vicinity of the cross marked in the attached pic.  Looks like it might be on the move soon...



16
Arctic sea ice / Re: What the Buoys are telling
« on: February 20, 2017, 07:49:11 AM »
Seems like another blip of life today.  6 days to collect enough energy for 2hrs operation.

17
Arctic sea ice / Re: The 2016/2017 freezing season
« on: January 31, 2017, 08:18:31 AM »
I could be in error here, but it appears that NeilT is being unfairly singled out. Isnt there at least a little room for different points of view here?
Seconded.

18
Arctic sea ice / Re: The 2016/2017 freezing season
« on: January 17, 2017, 06:03:42 AM »
That distinction between the two hemispheres might be seasonal.  Try going back in time on Nullschool to a point where it is summer in the north and winter in the south.  I suspect the pattern might be reversed.

19
Arctic sea ice / Re: The 2016/2017 freezing season
« on: January 01, 2017, 08:44:47 AM »
203 days (55%) of 2016 set record low extent figures for the day of the year (JAXA figures).   2005 is the oldest year in the records for low extent (11 days of the calendar year).

2016 = 203 days at record low extent
2012 = 83
2015 = 24
2011 = 23
2006 = 12
2005 = 11
2010 = 6
2007 = 4

Jan
2016: 1-7, 9, 15, 28-31 = 13 days at lowest recorded extent
2011: 8, 10-14 = 6 days
2006: 16-27 = 12 days

Feb
2016: 1-5, 7-24 = 23 days
2015: 27-29 = 3 days
2005: 6, 25, 26 = 3 days

Mar
2016: 30-31 = 2 days
2015: 1-21 = 21 days
2005: 22-29 = 8 days

April
2016: 1-30 = 30 days

May
2016: 1-31 = 31 days

June
2016: 1-27 = 27 days
2010: 28-30 = 3 days

July
2016: 4-7 = 4 days
2012: 25-31 = 7 days
2011: 8-24 = 17 days
2010: 1-3 = 3 days

August
2012: 1-31 = 31 days

September
2012: 1-30 = 30 days

October
2016: 20-31 = 12 days
2012: 1-15 = 15 days
2007: 16-19 = 4 days

November
2016: 1-30 = 30 days

December
2016: 1-31 = 31 days

20
Arctic sea ice / Re: The 2016/2017 freezing season
« on: December 20, 2016, 07:56:57 AM »
It's very quiet at work, so to occupy myself I looked at JAXA's extent graph of each year since 1978 and noted which year had the lowest extent for each day of the year.  As at 19 December, the results are:

2016 = 191 days at record low extent
2012 = 83
2015 = 24
2011 = 23
2010 = 18
2006 = 12
2005 = 11
2007 = 4

All that can happen over the next 12 days is 2016 will take days away from 2010.  Ie. if 2016 stays below 2010 for the rest of the year, it will be 2016= 203 and 2010 = 6.

Jan
2016: 1-7, 9, 15, 28-31 = 13 days at lowest recorded extent
2011: 8, 10-14 = 6 days
2006: 16-27 = 12 days

Feb
2016: 1-5, 7-24 = 23 days
2015: 27-29 = 3 days
2005: 6, 25, 26 = 3 days

Mar
2016: 30-31 = 2 days
2015: 1-21 = 21 days
2005: 22-29 = 8 days

April
2016: 1-30 = 30 days

May
2016: 1-31 = 31 days

June
2016: 1-27 = 27 days
2010: 28-30 = 3 days

July
2016: 4-7 = 4 days
2012: 25-31 = 7 days
2011: 8-24 = 17 days
2010: 1-3 = 3 days

August
2012: 1-31 = 31 days

September
2012: 1-30 = 30 days

October
2016: 20-31 = 12 days
2012: 1-15 = 15 days
2007: 16-19 = 4 days

November
2016: 1-30 = 30 days

December
2016: 1-19 = 19 days
2010: 20-31 = 12 days

21
Arctic sea ice / Re: The 2016/2017 freezing season
« on: November 20, 2016, 11:12:08 AM »
Obviously here wip did Arctic and Antarctic separately before doing the curious and unexpected combo so all three are out there for dissecting contributions to the anomaly. Something is thus wrong because NSIDC should be able to replicate the first two and so the third.

I have to agree with Meier that producing this combo could be a poor idea in general. It is the kind of thing used to confuse by the denier community. Also the poles are totally out of phase with summer insolation and winter radiation back to space.

I don't think it's such a curious or unexpected combo.  Various causally unconnected things can be reported on a global basis.  Eg. deforestation in Brazil is unrelated to deforestation in Indonesia, but a global figure is nonetheless useful.  It seems a rather obvious graphic to do in order to present a broader picture.  I think it's a great graphic and it has certainly raised awareness.  I've had friends who don't follow the cryosphere retweeting it.

The fact that the Antarctic and Arctic are currently each more than 1M km2 lower than the nearest previous low (let alone average) is very newsworthy and Wipneus' graphic is the perfect way to present it.  Next year may not appear as dramatic on the chart, but it won't erase that one big canary-in-the-coal-mine from this year's chart.

22
Arctic sea ice / Re: The 2016/2017 freezing season
« on: November 16, 2016, 11:30:06 AM »
Wow, JAXA is showing Arctic ice extent at a record low for this time of year, with growth flattening out for a few days.  And the Antarctic is also at a record low for this day, by a huge margin, and plummeting.

23
Arctic sea ice / Re: The 2016/2017 freezing season
« on: November 01, 2016, 09:44:16 PM »
The unknowns include:
Is the extra heat in the arctic exogenous (imported from lower latitudes) or endogenous (albedo-related or upwelled from warmer water at depth or both)?

Either way, it must be resulting from more heat in the system as a whole.  Unless, of course, it's anomalously cold somewhere else?

24
Arctic sea ice / Re: What the Buoys are telling
« on: September 26, 2016, 10:30:52 AM »
There seems to be a reasonable number out there, all with different sensors though:
http://iabp.apl.washington.edu/maps_daily_map.html

The O-Buoy project is the only one I've really followed though, probably because a picture (webcam) is worth a thousand words.

25
Arctic sea ice / Re: The 2016 melting season
« on: September 18, 2016, 02:01:19 PM »
Don't they usually wait until the end of the month for this kind of rankings??

If it has already gone lower than 2007, the only question remaining is whether it goes lower than 2012 (which seems unlikely).  In other years the rank might still be an open question at this time.

26
Arctic sea ice / Re: What the Buoys are telling
« on: September 15, 2016, 08:39:58 PM »
I wonder whether the camera's azimuth is the same as the GPS instrument's azimuth?

27
Arctic sea ice / Re: The 2016 melting season
« on: September 10, 2016, 04:07:14 PM »
Attached is an animated gif showing the ice movement and break-up North of Greenland and Ellesmere Island over the last week.  The frames of the gif are 3 September to 9 September (and back). Thanks to Jim Hunt who noted that I needed to reduce it to 700px width for the animation to work.  It's less detailed, but the effect is still noticeable.  Warning: 2.1Mb gif.

28
Developers Corner / Re: Creating Animated GIFs
« on: September 10, 2016, 04:02:51 PM »
Thanks for the pointer - that seems to be the issue.  I'll go and post it where I first posted it now...

29
Developers Corner / Re: Creating Animated GIFs
« on: September 10, 2016, 03:36:08 PM »
just testing an animated gif that doesn't seem to animate...

30
Arctic sea ice / Re: The 2016 melting season
« on: September 10, 2016, 10:06:18 AM »
Re the 'garlic press' - OB14 is currently heading down through McClure Strait with the ice.

31
Arctic sea ice / Re: What the Buoys are telling
« on: September 08, 2016, 01:33:41 PM »
i don't know whether it's any more accurate, but the obuoy site is showing it slightly further to the east (into the strait) - perhaps closer to the compacted ice?

it has been a fascinating journey - i wonder where it will be spending winter?

32
Arctic sea ice / Re: The 2016 melting season
« on: September 04, 2016, 06:07:04 AM »
So, according to JAXA's graph, this year's extent is now (3 Sept) the second lowest on record:
https://ads.nipr.ac.jp/vishop/#/extent

Looking at what previous years have done from this date (3 Sept), extent has mostly stayed flat or started to rise.  Just from looking at the graph, it seems there were 4 years with notable drops after today's date: 1984, 2007, 2010 and 2012.  The data for 1984 seems incomplete, so it may not be useful for comparison.  Of the others:

- 2007 dropped a further 310,000 km2
- 2010 dropped a further 410,000 km2
- 2012 dropped a further 270,000 km2

So, if 2016 equalled the previous largest post 3 September drop, it would drop to 3.64M km2.

33
Arctic sea ice / Re: The 2016 melting season
« on: September 03, 2016, 10:52:42 AM »
You are showing Jim Pettit's VOLUME (km^3) graph, but quoting ice EXTENT (km^2) numbers.

Oops!  So i did... apologies for any confusion.

The extent graph is attached, but it's now from 1 September.  The extent graph doesn't show anything counter-intuitive though it doesn't seem to include data from the 80's/90's.

34
Arctic sea ice / Re: The 2016 melting season
« on: September 02, 2016, 01:51:33 PM »
It's interesting looking back at Jim Pettit's projections graph from a month ago.  On 1 August the extent was around 6.7M km2 and it's now a touch over 4M km2.  The interesting thing is that the lower projections from a month ago follow trajectories from the 80's and 90's (from 1 August).  Now that we know what occurred from 1 August to 1 September, we can see that this year followed a trajectory from the 80's (a blue line).

Looking at the graph, most of the trajectories (from 1 August) for the last decade would have resulted in  higher minima.  Note the orange lines tending towards the higher minima.  It's interesting that from 1 August, the extent could have reached a new record minimum by following an 80's/90's trajectory.

So, looking at trajectories starting from the same point, why are the years with lower minima tending towards the projections with *higher* minima?  It seems counter intuitive.

Edit: typo


35
Arctic sea ice / Re: What the Buoys are telling
« on: August 29, 2016, 08:33:06 AM »
Shame about the drop on the lens at the moment - would have been a great sunset pic...

36
Arctic sea ice / Re: What the Buoys are telling
« on: August 20, 2016, 12:30:44 AM »
Camera seems to be updating every 15 minutes now?

I wonder why azimuth would be relatively stable?  I would have thought if it's floating free it would spin around freely.  Maybe a weather vane effect?

37
Arctic sea ice / Re: The 2016 melting season
« on: August 19, 2016, 04:08:20 AM »
Fascinating insight!

38
Arctic sea ice / Re: What the Buoys are telling
« on: August 16, 2016, 02:46:46 PM »
Yep - that's 12 hours!

39
Arctic sea ice / Re: What the Buoys are telling
« on: August 16, 2016, 12:27:16 PM »
Is that it in the background??

40
Arctic sea ice / Re: What the Buoys are telling
« on: August 16, 2016, 11:37:02 AM »
Now you don't ...

41
Arctic sea ice / Re: What the Buoys are telling
« on: August 16, 2016, 11:35:53 AM »
Now you see it...

42
Arctic sea ice / Re: What the Buoys are telling
« on: August 16, 2016, 08:26:52 AM »
That pond looks like a polynya now...

43
Arctic sea ice / Re: The 2016 melting season
« on: July 03, 2016, 02:49:57 PM »
Fragmented ice on the North pole.
This link shows ice fragmentation near the pole at the same time in 2013:
http://go.nasa.gov/29qBnIn

Looked much worse then.

44
Arctic sea ice / Re: The 2016 melting season
« on: June 21, 2016, 11:31:37 AM »
Almost a 100K km2 drop in extent today according to JAXA.  It's neck-and-neck between 2016 and 2012...

46
Arctic sea ice / Re: Arctic Image of the Day
« on: June 16, 2016, 08:55:38 AM »
Is that a rainbow? Icebow?

47
Arctic sea ice / Re: The 2016 melting season
« on: June 13, 2016, 07:42:57 AM »

48
Arctic sea ice / Re: Arctic Image of the Day
« on: June 06, 2016, 02:51:07 PM »
The East Siberian Sea looks spectacular today...

49
Arctic sea ice / Re: The 2016 melting season
« on: June 05, 2016, 05:49:16 AM »
Apparently sea ice extent INCREASED today.  10,350,720 for June 3 and 10,354,257 for June 4 = an increase of 3,537 km2.  Go figure.

Figures from the CSV file download:
https://ads.nipr.ac.jp/vishop/vishop-extent.html?N


50
Arctic sea ice / Re: The 2016 melting season
« on: June 02, 2016, 10:32:25 AM »
JAXA site seems to be back online and up-to-date:
https://ads.nipr.ac.jp/vishop/vishop-extent.html?N

Reporting 10,405,086 km2, June 1, 2016.  Still 440,000 km2 below any other year.


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