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11
Arctic sea ice / Re: Home brew AMSR2 extent & area calculation
« Last post by Lord M Vader on Today at 08:13:46 AM »
Epiphyte: melt ponds I think close to the pole :)

Wipneus: not much time left until you can take a strong but minor boat through the Northern Sea Route... Any ideas about earliestdate the route has opened up?
12
Arctic sea ice / Re: The 2017 melting season
« Last post by epiphyte on Today at 08:13:26 AM »
Moving(warmer than surface) air and moisture speed up heat transfer, yes.

...So carrying that forward one more step, when theres a persistent, soggy (albeit low-grade) LP area over much of the arctic, as there has been for a while now, what useful information does the "thawing degree day" metric impart?
13
Arctic sea ice / Re: What the Buoys are telling
« Last post by Jim Hunt on Today at 08:06:30 AM »
I guess I gotta go back and review more pix to see what it met up with when it drifted down the channel.


How about this one,  from September 10th?

http://GreatWhiteCon.info/resources/arctic-sea-ice-images/winter-201617-images/#OBuoy14
14
Arctic sea ice / Re: Home brew AMSR2 extent & area calculation
« Last post by epiphyte on Today at 08:04:31 AM »
That last frame looks pretty scary right above the pole - to me at least...
15
Arctic sea ice / Re: Home brew AMSR2 extent & area calculation
« Last post by Wipneus on Today at 07:57:54 AM »
The fast ice is breaking away in the ESS.
16
Arctic sea ice / Re: The 2017 melting season
« Last post by Tigertown on Today at 07:57:01 AM »
Moving(warmer than surface) air and moisture speed up heat transfer, yes.
17
Arctic sea ice / Re: The 2017 melting season
« Last post by epiphyte on Today at 07:51:00 AM »
Latest thawing degree days: [from http://sites.uci.edu/zlabe/arctic-temperatures/]


I find myself asking what it is that this graph is measuring. In the presence of ice the surface itself can never get above freezing can it? So if it is possible for this number to be higher than that must  it not reflect the air temperature at some hight above the surface?

If the above is the case, and the temperature is at or above the melting-point of seawater ice, then I don't see how that of itself sheds any light on whether freezing or thawing conditions are extant.


I'm far from an expert on this and absolutely open to correction but it seems sensible to me that at the extremes -

 - a temp of 2C, under cloudy conditions, in still air, might indicate that no atmospheric heat is being lost to the surface - i.e. no melting.

- OTOH, under equally cloudy conditions, with a 40 knot surface wind, a 3 degree 950MB air temp, 100% humidity and 2MM/hr of rain, a "surface" temp of -1.6C might indicate that heat is being sucked out of the air almost instantly - i.e. rapid melting.

...is this wrong?


18
Arctic sea ice / Re: Home brew AMSR2 extent & area calculation
« Last post by Wipneus on Today at 07:45:27 AM »
Uni Hamburg updated as expected today, also the behavior with respect to changing previously calculated values was perfect.

So the extent and area values are very close to 2012 and 2016:

Update 20170627.

Extent: -131.6 (+84k vs 2016, -518k vs 2015, -203k vs 2014, -642k vs 2013, +11k vs 2012)
Area: -147.8 (+5k vs 2016, -523k vs 2015, -258k vs 2014, -659k vs 2013, -199k vs 2012)

The regional details show that Hudson, Baffin and Kara contribute most:

Extent:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                    1.5                    -9.6                    -0.6
               Kara Sea             Barents Sea           Greenland Sea
                  -32.3                     2.3                    12.3
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                  -49.0                     0.0                   -38.7
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                  -12.1                    -4.8                    -0.9
             Bering Sea          Sea of Okhotsk            Total Extent
                    0.4                    -0.2                  -131.6

Area:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                  -15.7                   -19.9                     3.6
               Kara Sea             Barents Sea           Greenland Sea
                  -31.1                    -0.4                     0.0
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                  -38.5                     0.0                   -32.0
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                  -17.1                     2.9                     0.2
             Bering Sea          Sea of Okhotsk              Total Area
                    0.2                    -0.1                  -147.8

19
Arctic sea ice / Re: The 2017 melting season
« Last post by Blizzard92 on Today at 06:17:53 AM »
Latest thawing degree days: [from http://sites.uci.edu/zlabe/arctic-temperatures/]

20
Arctic sea ice / Re: What the Buoys are telling
« Last post by vigilius on Today at 05:49:42 AM »
Anyway back to real time updates. That foreground sure is a dark color....
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