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uniquorn

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Re: Arctic Ocean salinity, temperature and waves
« Reply #800 on: January 27, 2021, 12:08:04 AM »
Haven't noticed turbulence west of FJL before. I hesitate to say that they look like standing waves...

uniquorn

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Re: Arctic Ocean salinity, temperature and waves
« Reply #801 on: February 01, 2021, 10:22:32 PM »
Looking  more closely at the mixed layer depth in the West Spitsbergen current. Here the scale is set from 10m-350m so black is deeper than 350m as we are not clamping out of range values.
https://tinyurl.com/y2gkyfug

dec1-feb1 (7.2MB)

uniquorn

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Re: Arctic Ocean salinity, temperature and waves
« Reply #802 on: February 05, 2021, 01:45:07 PM »
A small cyclone whipped over the Yermak plateau yesterday

uniquorn

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Re: Arctic Ocean salinity, temperature and waves
« Reply #803 on: February 05, 2021, 08:32:09 PM »
Ice beginning to win the war of attrition with the West Spitzbergen current northwest of FJL.
rammb, jan26-feb4

added awi-amsr2-v103-feb1-5

and wv brightness temp, feb6  https://go.nasa.gov/3oTdw83

and argo float 3902108 reporting SST of well over 4C on Feb4. Holding that temp to a depth of 200m. Hopefully this float will stay with the WSC as it turns east.
Quote
PLATFORM_CODE   DATE (YYYY-MM-DDTHH:MI:SSZ)   DATE_QC   LATITUDE (degree_north)   LONGITUDE (degree_east)   POSITION_QC   PRES (decibar)   PRES_QC   PSAL (psu)   PSAL_QC   TEMP (degree_Celsius)   TEMP_QC
3902108   2021-02-04T20:23:30Z   1   77.84765   9.33892   1   2.9   1   35.015   1   4.27   1
3902108   2021-02-04T20:23:30Z   1   77.84765   9.33892   1   4.2   1   35.015   1   4.271   1
3902108   2021-02-04T20:23:30Z   1   77.84765   9.33892   1   5      1   35.014   1   4.274   1
3902108   2021-02-04T20:23:30Z   1   77.84765   9.33892   1   5.9   1   35.012   1   4.275   1
3902108   2021-02-04T20:23:30Z   1   77.84765   9.33892   1   6.7   1   35.017   1   4.27   1
.
.
3902108   2021-02-04T20:23:30Z   1   77.84765   9.33892   1   199.2   1   35.006   1   4.278   1   199.2   1   4.278
3902108   2021-02-04T20:23:30Z   1   77.84765   9.33892   1   201.1   1   35.01   1   4.274   1   201.1   1   4.274
3902108   2021-02-04T20:23:30Z   1   77.84765   9.33892   1   203   1   35.01   1   4.274   1   203   1   4.274
3902108   2021-02-04T20:23:30Z   1   77.84765   9.33892   1   205.4   1   35.008   1   4.274   1   205.4   1   4.274
3902108   2021-02-04T20:23:30Z   1   77.84765   9.33892   1   207.9   1   35.009   1   4.273   1   207.9   1   4.273
3902108   2021-02-04T20:23:30Z   1   77.84765   9.33892   1   209.8   1   35.008   1   4.269   1   209.8   1   4.269
3902108   2021-02-04T20:23:30Z   1   77.84765   9.33892   1   211.8   1   35.008   1   4.265   1   211.8   1   4.265
3902108   2021-02-04T20:23:30Z   1   77.84765   9.33892   1   213.8   1   35.007   1   4.259   1   213.8   1   4.259
« Last Edit: February 06, 2021, 06:47:25 PM by uniquorn »

uniquorn

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Re: Arctic Ocean salinity, temperature and waves
« Reply #804 on: February 06, 2021, 01:20:05 AM »
https://go.nasa.gov/3cFyViG
:bookmark for weak Laptev ice north and west of NSI
« Last Edit: February 06, 2021, 12:49:00 PM by uniquorn »

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Re: Arctic Ocean salinity, temperature and waves
« Reply #805 on: February 06, 2021, 12:50:52 PM »
Polarview S1B crop of WSC area above. (half size)

location of the image.
A lot of images of the white band area recently

uniquorn

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Re: Arctic Ocean salinity, temperature and waves
« Reply #806 on: February 06, 2021, 04:25:40 PM »
Laptev ice dynamics, jan7-feb5. The Polarview S1A sweep missing out the crucial frame.
40km/h surface winds at -16C close to NSI during feb2-3 with cloud. Up to 70km/h at 1000hPa
« Last Edit: February 06, 2021, 08:04:30 PM by uniquorn »

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Re: Arctic Ocean salinity, temperature and waves
« Reply #807 on: February 07, 2021, 11:25:51 AM »
This constant high pressure with less clouds gives us a great winter view of ice movement.
https://go.nasa.gov/3cPUmNR, amsr2-uhh inset, Kara,  jan12-feb6

Much less fast ice than usual this year. Again, feb2-4 causing lift off.

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Re: Arctic Ocean salinity, temperature and waves
« Reply #808 on: February 09, 2021, 01:09:57 AM »
Argo float 6903547 a little further off the west coast of Svalbard showing colder temps of -1.727C at 6.1m depth on Feb6.

uniquorn

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Re: Arctic Ocean salinity, temperature and waves
« Reply #809 on: February 09, 2021, 01:58:25 PM »
rough overlay of buoy positions onto amsr2-uhh, feb6 explaining the drop in temperatures at Argo float 6903547 on the tip of the tongue in the fram strait

float7900550, north of Svalbard also resurfaced on feb6, quite a chart. Will have to check some other days though it is right on the shelf break.

« Last Edit: February 09, 2021, 03:41:18 PM by uniquorn »

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Re: Arctic Ocean salinity, temperature and waves
« Reply #810 on: February 10, 2021, 11:56:57 PM »
Following on from here in the freezing season thread, a few more observations on the february anticyclone event.

Close up on the siberian side, feb9-10

A wider view showing the engagement of the Beaufort into a larger drift. feb5-10

rammb band I5, feb7-10   https://col.st/YDzXQ

lol polarview


« Last Edit: February 11, 2021, 12:42:50 AM by uniquorn »

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Re: Arctic Ocean salinity, temperature and waves
« Reply #811 on: February 11, 2021, 04:28:34 PM »
Argo float 6903558 in the WSC west of Svalbard a little farther away from the ice edge recording SST of just over 2.5C on feb9. I suppose that is mixed layer to 200m.

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Re: Arctic Ocean salinity, temperature and waves
« Reply #812 on: February 12, 2021, 12:10:45 PM »
A close up of the ess break up edge, feb3-11  https://go.nasa.gov/3jJQe3B

Laptev, feb3-11.  https://go.nasa.gov/2Z9Q247
« Last Edit: February 12, 2021, 12:22:17 PM by uniquorn »

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Re: Arctic Ocean salinity, temperature and waves
« Reply #813 on: February 19, 2021, 12:28:32 PM »
Refreeze tails near the ice edge over the WSC north west of FJL. Wind is from bottom right to top left. I suppose the brine sinks and the fresher water refreezes. Or maybe it's just ablation and smaller pieces don't catch the wind.

S1B_EW_GRDM_1SDH_20210218T060452_994C_N_1.final cropped, half size.

Full size close up.

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Re: Arctic Ocean salinity, temperature and waves
« Reply #814 on: February 23, 2021, 01:10:47 AM »
arc feb22 for ref

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Re: Arctic Ocean salinity, temperature and waves
« Reply #815 on: February 28, 2021, 02:22:13 PM »
https://go.nasa.gov/2NDCZWH  brightness temp from suomi/npp and noaa20, feb28

uniquorn

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Re: Arctic Ocean salinity, temperature and waves
« Reply #816 on: March 01, 2021, 11:25:05 AM »
Worldview aqua modis of Chukchi today, slight contrast adjustment
https://go.nasa.gov/2O8uJO7

Perhaps all caused by pressure difference across the bering strait, maybe a component from underlying ocean current.

Nearest buoy is air launched buoy AXIB 300234065495020 attempting a complete circuit of 'the gyre'. Temps very cold recently. No salinity data. Jan2018-feb2021, a sturdy buoy.
« Last Edit: March 01, 2021, 11:48:37 AM by uniquorn »

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Re: Arctic Ocean salinity, temperature and waves
« Reply #817 on: March 02, 2021, 10:24:29 AM »
https://go.nasa.gov/3e0Pfek, atlantic side, heavy contrast
updated below
« Last Edit: March 03, 2021, 10:19:59 AM by uniquorn »

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Re: Arctic Ocean salinity, temperature and waves
« Reply #818 on: March 03, 2021, 10:22:40 AM »
https://go.nasa.gov/2OfVdNV, mar2-3. Ice north of Greenland perhaps missing the larger MYI component this year.

a closer view with a bit less cloud
« Last Edit: March 03, 2021, 01:58:21 PM by uniquorn »

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Re: Arctic Ocean salinity, temperature and waves
« Reply #819 on: March 03, 2021, 11:40:47 PM »
Laptev, brightness temp and aqua modis, medium contrast. https://go.nasa.gov/3uUDP1I

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Re: Arctic Ocean salinity, temperature and waves
« Reply #820 on: March 04, 2021, 08:38:00 AM »
Quote
Ice north of Greenland perhaps missing the larger MYI component this year.

a closer view with a bit less cloud

Uniquorn, I wonder why the cracks are not visible on this DMI sentinel image taken the same day ?

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Re: Arctic Ocean salinity, temperature and waves
« Reply #821 on: March 04, 2021, 11:50:06 AM »
Quote
Ice north of Greenland perhaps missing the larger MYI component this year.
a closer view with a bit less cloud
Uniquorn, I wonder why the cracks are not visible on this DMI sentinel image taken the same day ?

Good idea, we could learn a lot from more comparisons of radar and brightness temperature images
Quote
Sentinel-1 is the first of the Copernicus Programme satellite constellation conducted by the European Space Agency.[4] This mission is composed of a constellation of two satellites, Sentinel-1A and Sentinel-1B, which share the same orbital plane. They carry a C-band synthetic-aperture radar instrument which provides a collection of data in all-weather, day or night. This instrument has a spatial resolution of down to 5 m and a swath of up to 400 km. The constellation is on a sun synchronous, near-polar (98.18°) orbit. The orbit has a 12-day repeat cycle and completes 175 orbits per cycle.

Quote
Brightness Temperature (Band I5, Night)
Temporal coverage: 17 September 2017 - Present

The VIIRS Brightness Temperature, Band I5 Night layer is the brightness temperature, measured in Kelvin (K), calculated from the top-of-the-atmosphere radiances. It does not provide an accurate temperature of either clouds nor the land surface, but it does show relative temperature differences which can be used to distinguish features both in clouds and over clear land. It can be used to distinguish land, sea ice, and open water over the polar regions during winter (in cloudless areas).

The VIIRS Brightness Temperature layer is calculated from VIIRS Calibrated Radiances (VNP02) and is available from the joint NASA/NOAA Suomi National Polar orbiting Partnership (Suomi NPP) satellite. The sensor resolution is 375m, the imagery resolution is 250m, and the temporal resolution is daily.

My layman interpretation is that Sentinel-1 is showing ice surface features picked up by reflected radar while VIIRS Brightness Temperature(Band 15) is showing temperature difference, in this case mostly that escaping from the ocean beneath the ice, for example, old leads in various thicknesses of refreeze.

A basic overlay is a useful start for further interpretation despite the huge difference in resolution. Large older floes are clearly identified amongst the younger refreeze by brightness temperature with radar showing their intricate surface features.
Brightness temperature scale ~200%, Sentinel-1 scale ~20%. Both images have been contrast adjusted to clarify the overlay. Different palettes might reveal more.

click for overlays

Thinking about it, it's possible that leads may be exaggerated somewhat by brightness temp detection from space. It is very good for showing ice dynamics during winter though. In summer the temperature diff is much less.
« Last Edit: March 04, 2021, 12:25:38 PM by uniquorn »

Niall Dollard

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Re: Arctic Ocean salinity, temperature and waves
« Reply #822 on: March 04, 2021, 12:42:28 PM »
Thanks !

That overlay is excellent.

oren

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Re: Arctic Ocean salinity, temperature and waves
« Reply #823 on: March 04, 2021, 12:49:09 PM »
Nice explanation uniquorn. The very visible leads in brightness temp are actually refrozen so hidden beneath the ice surface, waiting for the melting season to manifest their thinness.

uniquorn

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Re: Arctic Ocean salinity, temperature and waves
« Reply #824 on: March 04, 2021, 09:46:02 PM »
In case there's any doubt about cracks here's rammb, band I5, Fram funnel and Yermak, mar2-4
best viewed at half speed
https://col.st/mWRhW
« Last Edit: March 04, 2021, 09:57:16 PM by uniquorn »

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Re: Arctic Ocean salinity, temperature and waves
« Reply #825 on: March 04, 2021, 10:54:46 PM »
Had to get yermak first. Here is the area we were looking at. There aren't so many cloud free frames.
https://col.st/H6bhU  , mar3-4

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Re: Arctic Ocean salinity, temperature and waves
« Reply #826 on: March 06, 2021, 01:03:00 PM »
update on ice north of Greenland, https://go.nasa.gov/3qvcLTH mar3 and 6.

amsr2-uhh, baffin, feb26-mar5. Some rapid changes in wind direction recently.

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Re: Arctic Ocean salinity, temperature and waves
« Reply #827 on: March 08, 2021, 03:52:49 PM »
Ice melting in the WSC north east of Svalbard. Drift is, perhaps, a bit faster than melt at the moment.
rammb, mar7-8  https://col.st/cpTW8

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Re: Arctic Ocean salinity, temperature and waves
« Reply #828 on: March 12, 2021, 10:40:36 PM »
https://go.nasa.gov/38Bppdt  aqua modis, beaufort, mar10 for ref.

chukchi, mar12
« Last Edit: March 12, 2021, 10:56:48 PM by uniquorn »

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Re: Arctic Ocean salinity, temperature and waves
« Reply #829 on: March 14, 2021, 12:41:49 PM »
Laptev, aqua modis, mar14, high contrast

Cyclone over North Kara, rammb, day/night band, https://col.st/IPBn8, mar12-14

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Re: Arctic Ocean salinity, temperature and waves
« Reply #830 on: March 29, 2021, 05:39:02 AM »
Interesting salinity gif for the last 30 days. The Laptev has become a lot saltier during the last 30 days, and when the gif recycles, you can see how much the salinity edge has increased all over the CAB. I don't know if this is unusual, or normal. I just find it interesting. I'm hope the salinity experts will be able to say more about this.

And is it normal that salinity in the beaufort sea is going up this much along the CAA coast?
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Re: Arctic Ocean salinity, temperature and waves
« Reply #831 on: April 09, 2021, 06:19:15 PM »
<snippage>
And is it normal that salinity in the beaufort sea is going up this much along the CAA coast?

Isn't that water in the Beaufort and the CAB a little too salty?  :-\

Too salty? - Don't know. I find it difficult to interpret 0m salinity under ice and after seeing the Tbuoy data I'm not sure that much should be inferred from modelled data.