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Author Topic: Arctic Ocean salinity, temperature and waves  (Read 13614 times)

uniquorn

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Re: Arctic Ocean salinity, temperature and waves
« Reply #100 on: November 23, 2018, 07:25:03 PM »
A very good view of the eddy north of Svalbard yesterday on polarview. Definitely some rotation there.
« Last Edit: November 23, 2018, 07:40:45 PM by uniquorn »

uniquorn

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Re: Arctic Ocean salinity, temperature and waves
« Reply #101 on: November 26, 2018, 10:24:00 PM »
Quite a storm brewing on the atlantic side this week.
ecmwf wave forecast from windy, nov27-dec5

uniquorn

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Re: Arctic Ocean salinity, temperature and waves
« Reply #102 on: November 26, 2018, 10:44:46 PM »
Forgot about ice surface temperature.
DMI polarportal, sep14-nov25

uniquorn

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Re: Arctic Ocean salinity, temperature and waves
« Reply #103 on: December 01, 2018, 06:19:04 PM »
Update on the whoi buoys ITP103-110. Their drift track has been more in line with the annual ice drift recently. ITP107 is showing a deeper lower salinity layer as it drifts closer to the gyre. ITP109 is also starting to show a change in profile. Im not sure how to read ITP110.

Shared Humanity

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Re: Arctic Ocean salinity, temperature and waves
« Reply #104 on: December 02, 2018, 06:17:10 PM »
Quite a storm brewing on the atlantic side this week.
ecmwf wave forecast from windy, nov27-dec5

Those waves have to wreak havoc on the ice in the Greenland Sea. Especially with sea surface temperatures between 0C and -1.5C lurking nearby.
« Last Edit: December 02, 2018, 06:25:41 PM by Shared Humanity »

uniquorn

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Re: Arctic Ocean salinity, temperature and waves
« Reply #105 on: December 03, 2018, 10:30:30 PM »
More stormy weather is forecast. I'll revisit this one in a few days.
windy-wam-dec3-forecast-for-dec12, atlantic side.

A comparison of mercator temperature at 0m and 34m depth with JAXA RGB from nov1-dec2 in the Chukchi sea. While the JAXA images that I can easily download are smaller (lower resolution) than amsr2 products they do give a better representation of differing ice types.
When the newer thin ice in the Beaufort meets the eddies on the edge of the gyre the interaction can be seen from ~10-17nov. After that, the thicker ice (in blue) is not so responsive and has picked up a lot of momentum from the continuous 25-40km/h winds over the last week.
Chukchi and Beaufort, Mercator temperature 0m and 34m, jaxa rgb, nov1-dec2

edit:added mercator temperature scales
« Last Edit: December 03, 2018, 11:28:47 PM by uniquorn »

oren

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Re: Arctic Ocean salinity, temperature and waves
« Reply #106 on: December 04, 2018, 01:56:47 AM »
Superb graphics/animations, thanks uniquorn.

uniquorn

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Re: Arctic Ocean salinity, temperature and waves
« Reply #107 on: December 08, 2018, 01:56:59 PM »
Worldview, viirs, bt15day doing a great job yesterday in relatively clear weather with a cyclone over the Beaufort gyre (click on the image for full size). Ice lifting off the CAA tending to confirm the mercator model indicating upwelling east and west of the Mclure strait.
Mercator, CAA, 0m and 30m salinity, nov1-dec7.
edit:added salinity scales. (some of the 0m salinity increase should be brine exclusion from freezing ice, but probably not in the Amundsen gulf or along the CAA coast)

worldview link: https://tinyurl.com/yaszxycm

edit2: Added ascat to the salinity animation.

« Last Edit: December 08, 2018, 08:25:30 PM by uniquorn »

uniquorn

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Re: Arctic Ocean salinity, temperature and waves
« Reply #108 on: December 09, 2018, 04:19:26 PM »
Ice near the Mclure Strait rotating anticlockwise during the passage of the last cyclone. edit:Probably temporary.
Worldview, viirs bt15n, dec7-9  https://tinyurl.com/y8qnzkyr
« Last Edit: December 09, 2018, 04:24:54 PM by uniquorn »

uniquorn

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Re: Arctic Ocean salinity, temperature and waves
« Reply #109 on: December 10, 2018, 04:45:14 PM »
Update on Mercator 0m salinity model showing an atlantic push eastward during the recent stormy weather, possibly causing upwelling on the southern Kara sea coast.
The model also indicating upwelling on the CAA/Beaufort and Chukchi coast. I don't know if the increase in salinity along the CAA is due to brine exclusion or upwelling. Wind driven lift off from the coast is visible on Worldview, but it's been very cold so it's likely the fast ice has been weakened from below. Comments very welcome.
Mercator 0m salinity, nov20-dec9 (scale same as above)
« Last Edit: December 10, 2018, 05:14:59 PM by uniquorn »

uniquorn

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Re: Arctic Ocean salinity, temperature and waves
« Reply #110 on: December 11, 2018, 06:34:05 PM »
The ecmwf wave forecast on dec3 wasn't too bad that far out, though there are pretty large waves most days at the moment. Barents/Kara getting a battering tomorrow but not the CAB.
windy ecmwf wam dec12

edit:
Polarview image yesterday of lower concentration ice north of FJL. Mercator 0m salinity and amsr2-uhh ice concentration inset.
« Last Edit: December 11, 2018, 09:40:29 PM by uniquorn »

uniquorn

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Re: Arctic Ocean salinity, temperature and waves
« Reply #111 on: December 13, 2018, 10:36:22 PM »
Thanks to Brigantine for the heads up on the ARGO float 3902910 currently north of FJL.
The first image shows the drift trajectory and the cycle (report) number. The projection could be better for the arctic but Svalbard is clearly identifiable centre left, FJL under the 80N text.

The animation shows temperature and salinity charts for cycle 65,70,73 and 83-87 (latest). From my limited understanding of the charts, this float appears to have drifted along the ice front in the warm current at depth, surfacing sometimes into cold meltwater, other times into the warm current.
2 days ago SST was 2.5C salinity34.85, today -1.6C salinity 34.15

http://www.argo.ucsd.edu/How_Argo_floats.html
Quote
Argo is an international collaboration that collects high-quality temperature and salinity profiles from the upper 2000m of the ice-free global ocean and currents from intermediate depths. The data come from battery-powered autonomous floats that spend most of their life drifting at depth where they are stabilised by being neutrally buoyant at the "parking depth" pressure by having a density equal to the ambient pressure and a compressibility that is less than that of sea water. At present there are several models of profiling float used in Argo. All work in a similar fashion but differ somewhat in their design characteristics. At typically 10-day intervals, the floats pump fluid into an external bladder and rise to the surface over about 6 hours while measuring temperature and salinity. Satellites or GPS determine the position of the floats when they surface, and the floats transmit their data to the satellites. The bladder then deflates and the float returns to its original density and sinks to drift until the cycle is repeated. Floats are designed to make about 150 such cycles.

data here http://www.argodatamgt.org/Access-to-data/Description-of-all-floats2
choose 3901910

"These data were collected and made freely available by the Coriolis project and programmes that contribute to it (http://www.coriolis.eu.org)."
edit: slowed the gif a bit
« Last Edit: December 13, 2018, 10:51:43 PM by uniquorn »