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Topics - uniquorn

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1
Developers Corner / Dev library
« on: September 12, 2019, 11:48:41 AM »
Resizing table for overlays:
satellite           pxl       %      ~km/pxl    ~km^2/pxl
SMOS              397.5    75.815   11.92      5.06
Ascat              524.3   100.000    9.04      6.67
OsiSaf            1075.5   204.711    4.41     13.66
SMOS-SMAP   1146.0   218.577    4.13     14.59
AMSR2           1197.6   228.419    3.96     15.24



2
Arctic sea ice / MOSAiC news
« on: September 11, 2019, 11:43:21 AM »
The MOSAiC expedition begins on the Sep20.

Quote
MOSAiC - Multidisciplinary drifting Observatory for the Study of Arctic Climate

It could be the largest-scale Arctic research expedition of all time: in September 2019 the German research icebreaker Polarstern will depart from Tromsø, Norway and, once it has reached its destination, will spend the next year drifting through the Arctic Ocean, trapped in the ice. A total of 600 people from 19 countries, who will be supplied by other icebreakers and aircraft, will participate in the expedition – and several times that number of researchers will subsequently use the data gathered to take climate and ecosystem research to the next level. The mission will be spearheaded by the Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI).

The expedition programme is here
More information here:  https://www.meereisportal.de/en/mosaic/

Image of the general set-up
Area of MOSAiC start location overlaid onto unihamburg amsr2-uhh, aug1-sep11
edit: tidied up a bit and updated Polarstern position image
 

3
Reposting here for easier reference.
Following up on persistent ESS ice in post https://forum.arctic-sea-ice.net/index.php/topic,2591.msg224137.html#msg224137. Here showing a 16days/sec worldview animation from feb2015-aug2019 of the two probable shoals which look like they are well inside the GMRT bathymetry 25m contour, perhaps indicating a near surface gravel bank or similar. Elevation indicates -20m. https://www.gmrt.org/GMRTMapTool/np/

Polarview sentinel1 image of the two possible shoals from 20190823
72.3031 164.2392 EPSG:3413
72.7482 161.3865 EPSG:3413
https://www.polarview.aq/arctic

GMRT bathymetry, heavy contrast to show contours with worldview terra modis aug23 overlay(rotated 45deg)

4
Arctic sea ice / Ice edge at minimum poll
« on: April 08, 2019, 11:08:18 PM »
There may be a gloomy melting season ahead. Here is a lighthearted competition to take our minds off the seriousness of it all.
Two brave posters have already made predictions for the shape of the ice edge at minimum in september. The winner of this poll has the dubious honour of becoming option1 in the july poll. Hopefully you will be able to change your vote. If not, I'll wait till the 20th when entries close and ask neven to fix it.

Three simple steps to submit an entry:
download the top map named option1
add your own prediction using a new colour.
attach your prediction to a post on this thread giving the colour a name.
New entries will then be added to the options

In the event that there are 2 very similar entries the earliest will be added to the options.
Maximum number of dimensions = 24. That's probably about 11 entries.
Closing date for entries is 20th april, voting closes on 30th.

Hat tip to Niall and bbr for the idea

5
Developers Corner / poll test
« on: April 08, 2019, 09:46:39 PM »
tst

6
Arctic sea ice / Arctic Ocean salinity, temperature and waves
« on: October 04, 2018, 01:05:42 PM »
I thought this topic needed a dedicated thread as comments tend to get lost in the freezing/melting season threads. Fish Out of Water noticed a rapid increase in salinity at 300m on the Mercator Ocean model and questions were raised as to it's validity. Snips and links below
Update on Mercator 300m salinity, aug1-sep30. (every 2days, scale is not static)
http://bulletin.mercator-ocean.fr/en/permalink/PSY4/animation/3/20180801/20180930/2/4

Is this still real? And if so, any explanations?

If it was a Kelvin wave from the deep waters, this could change the whole dynamic of the arctic: lowering freezing temps, holding more heat in summer, drawing up a long chain of warmer water? and likely half hidden under the existing pack as it looks to only show around the edges!  Wondering if the 'bobbing effect' of so many smaller bergs might serves as a pump to circulate itself.
<snippage> another possibility is that the saline water is moving across the Beaufort at depth and is backing up in the direction it's coming from and merely leaking into the Beaufort gyre following the shelf bathymetry. That is it's Atl. water.
<snippage>
I think the wind shift caused a coastal Kelvin wave of shoaling of warm salty Atlantic water from depths below 300m up to the 300m level. I have forgotten who suggested it was a Kelvin wave, but I think that's correct because shifts in wind regimes can cause coastal Kelvin waves.
Extraordinary amounts of warm salty Pacific water have been flowing towards the Barrow submarine canyon, but that water hasn't had the time to reach the CAA and loops show that that water may be rotating clockwise towards the Chukchi shelf margins, not the CAA. The warm water that's sinking in the Chukchi region will likely store heat in the water layers above 300m.
<snippage>
Is it likely that long distance waves and, to some extent, tidal movements have been suppressed by thick pack ice and that, as the percentage of open water increases, we will begin to see evidence of larger scale 'bottom mixing' as well as more localised storm driven 'top mixing' of arctic waters?
As the Windy wave image shows, the damping effect of arctic ice appears to be diminishing.
Mercator 300m salinity and temperature, aug1-oct4.
Windy ecmwf waves and SST, oct4

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