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Messages - uniquorn

Pages: [1] 2 3 ... 36
1
Developers Corner / Re: Test space
« on: Today at 10:03:11 PM »
@oren 10MB is too big (everyone will want to post that size)

Here testing nullschool overlaid onto L Kaleschke leads. Irritating that I used PS locations from S1 images which stopped being available. Will rework this with p207 locs sometime. (substituted for the last few frames)
@johnm33 PS moves with the leads (except when there is no location data

2
I find it particularly interesting that the leads and apparent wave structures move through the ice rather than with it, the PS' slow progress is the best indication of this I've seen. The emergent double features indicates an acceleration?
Long version probably off topic for the mosaic thread.
Kaleschke Sic Leads, oct1-feb20 for further perusal. Lead motion likely wind based, will try a nullschool overlay sometime.

3
Arctic sea ice / Re: MOSAiC news
« on: Today at 01:19:29 PM »
drift as noted above

4
Arctic sea ice / Re: The 2019/2020 freezing season
« on: Today at 10:03:48 AM »
New maximum extent.
[ADS NIPR VISHOP (JAXA)] Arctic Sea Ice Extent.
February 20th, 2020:
     14,099,241 km2, a century increase of 114,662 km2:o
     Source: https://ads.nipr.ac.jp/vishop/#/extent
Less running commentary ;)

5
Developers Corner / Re: Test space
« on: February 20, 2020, 10:23:13 PM »
That is of course if you plan to ever make another...
rough and ready, date position moved in 2015/6 so you have to guess some of those.
pls download

6
Arctic sea ice / Re: The 2019/2020 freezing season
« on: February 20, 2020, 05:59:58 PM »
Drift on the Atlantic side before the forecast warm spell.
uni-hamburg amsr2-uhh, atl, feb10-19

7
Arctic sea ice / Re: The 2019/2020 freezing season
« on: February 20, 2020, 12:19:52 PM »
https://go.nasa.gov/37EBZFr, Okhotsk sea (north), feb10-20, unihamburg-amsr2uhh inset. ctr

edit: Early maximum extent just about hanging in there. Probably dependent mostly on possible increases in Okhotsk and Baffin/Newfoundland (still at all time low). Bering still high for recent years and Barents/Kara forecast for southerly winds, so drifting north. Very little MYI in Greenland and Baffin Seas.
Wipneus regional extent, feb18. updated to feb19 - barentsz/kara drop, baffin/nfld rise, okhotsk slightly up, bering(very southerly) likely over reached with the continuous drift.
hmm St Lawrence

8
Arctic sea ice / Re: MOSAiC news
« on: February 20, 2020, 12:04:14 PM »
Longitude dropping quickly as they continued north west yesterday.
updated below

9
Arctic sea ice / Re: MOSAiC news
« on: February 19, 2020, 12:34:50 PM »
PS continued drifting north west. With the current cyclone, perhaps the two teams will share the most northerly location in a few days time.
updated below

10
Another candidate (seen before) further east of NSI. 2 are visible on these images. ctr

11
Arctic sea ice / Re: MOSAiC news
« on: February 18, 2020, 05:58:23 PM »
Hopefully PS and KD are ok in deep water.
Quote
Given a similar calculation for L1 and L3
Tbuoy gps appear to be struggling somewhat. Wbuoys didn't last long. I and Fbuoys??
An equal combination of R8(L2), R9(L1) and S94(L3) gives the estimated PS location below. It looks a bit too far west. I'll run it back to known location points, it could work.

added jan5-15 as a test. Red dots are S1 calculated PS locations (timing not checked)

12
Arctic sea ice / Re: MOSAiC news
« on: February 18, 2020, 01:27:40 PM »
New Snowbuoy 2020S99. A touch south east of p207.

13
Arctic sea ice / Re: Arctic Ocean salinity, temperature and waves
« on: February 17, 2020, 01:32:19 PM »
osisaf drift, beaufort, sep21-feb15

14
Arctic sea ice / Re: Arctic Ocean salinity, temperature and waves
« on: February 16, 2020, 09:49:51 PM »
or not

15
Arctic sea ice / Re: MOSAiC news
« on: February 15, 2020, 12:30:14 AM »
.

16
Arctic sea ice / Re: The 2019/2020 freezing season
« on: February 14, 2020, 12:55:05 PM »
Despite the drift, plenty of 1-2yr old ice is still melting on arrival at Svalbard. The forecast deep cyclone over Barents/Kara persists from the long term into medium term.
Extent on feb10 "10,048 k, 790 k (8.5%) MORE than the average last 10 years gain to date of 9,258 k."
Near term Kara drift possibly outweighs upcoming Barents drift and melt.
Bering sea already way over recent maximums
Baffin at all time low, very little MYI component.
Relatively mild over Okhotsk coastal region.

Early maximum extent?
Wipneus regional area feb12
Worldview, Atlantic side, https://go.nasa.gov/3bFFajp (rotated-north is down)

17
Arctic sea ice / Re: MOSAiC news
« on: February 13, 2020, 11:36:31 PM »
Now, where to put that airstrip?
Here showing most Mosaic IABP buoys that report on the hour. Some report only on the half hour. Inset is nullschool wind isobaric at 1000hpa. Frames are repeated twice to match the hourly buoys. Projection is done using PlotSvalbard in R. Delaunay triangulation in Octave.
 

18
Arctic sea ice / Re: MOSAiC news
« on: February 13, 2020, 02:03:59 PM »
drift speed increased yesterday, mostly west, a touch north, feb10-13. Data for P204(middle) stops earlier than the others at 00hrs

19
Arctic sea ice / Re: Arctic Ocean salinity, temperature and waves
« on: February 12, 2020, 09:47:20 PM »
a rough and ready view of ascat, jan1-feb11 (no clean up, bad labelling)
The beaufort arch appears to have stalled. Hopefully normal service will be resumed in a couple of days.

20
Arctic sea ice / Re: The 2019/2020 freezing season
« on: February 12, 2020, 12:26:36 PM »
It's normal to see polynya and ridging along the fixed ice line. Not so sure about the large radial leads. https://go.nasa.gov/39ujJ38 (suomi/npp only goes back to sep2017)

Animation here

21
Arctic sea ice / Re: MOSAiC news
« on: February 12, 2020, 11:38:10 AM »
drifted west and north. Map from FoMo inset
250 frames@24fps. Interesting that the map is Greenland down (Perhaps it is a Nansen original)

22
Arctic sea ice / Re: MOSAiC news
« on: February 11, 2020, 09:32:45 PM »
Quote
persistent anti-cyclone to the north of Wrangel Island.
Hopefully not too far off topic, that shift is allowing significant leads to open in the ESS.
https://go.nasa.gov/39ujJ38, ESS, feb6-11. ctr

23
Arctic sea ice / Re: MOSAiC news
« on: February 11, 2020, 03:09:38 PM »
So many bright dots on S1 images. cffr (07:01:03 today)
KD 84.1N81.4E 2020-02-11 18:57 local time

24
Arctic sea ice / Re: MOSAiC news
« on: February 11, 2020, 01:12:41 PM »
drifted westnorth yesterday ;)

Quote
Christian Katlein@CKatlein
26 Jan
When he realized, that he won't drift to the pole, #Nansen went North by
skis. As we likely passed our northernmost point, we did the same ... As
we are already 150km further north than he ever reached, we only walked
for 1 hour and camped only 1 night to test our survival
Maybe they'll go camping again  https://twitter.com/CKatlein

tech note: nullschool locations are from p207, the northernmost buoy. The title is incorrect. It should say P201, 204 and 207. P193 often, but irregularly, misses ~2hrs of data so I went back to 201.

25
Arctic sea ice / Re: MOSAiC news
« on: February 10, 2020, 05:11:40 PM »
Polarstern just visible on rammb north of the 87.5N graticule.  https://col.st/a1WSn

26
Arctic sea ice / Re: MOSAiC news
« on: February 10, 2020, 02:16:59 PM »
drift update, still headed north west, picking up speed again.
No polarview of KD area today so here is best I could find through cloud on rammb day/night band ctr
Lat line is 82.5N
KD at 83.7N 79.73 at 2020-02-10 19:00 local time https://www.cruisemapper.com/?imo=7824405

27
Arctic sea ice / Re: MOSAiC news
« on: February 09, 2020, 11:25:08 AM »
Headed steadily north west
155franes@12fps
Chaperone? 82.85N76.0 and 82.88N76.77


28
Arctic sea ice / Re: Arctic Ocean salinity, temperature and waves
« on: February 08, 2020, 09:50:07 PM »
Ran the numbers on itp113 also. https://www.whoi.edu/page.do?pid=165156

29
Arctic sea ice / Re: Arctic Ocean salinity, temperature and waves
« on: February 08, 2020, 09:05:55 PM »
caption for image below from Nature
Quote
a Before and b after 2007, including the wind work, W (comprised of atmosphere-ocean, Wao, and ice–ocean, Wio, components), available potential energy (APE), and eddy dissipation, Weddy. The atmosphere and ocean circulations are illustrated by ua and ug, respectively. The size of the arrows/vectors represents their relative strength. The loss of sea ice after 2007 led to increased wind energy input to the BG, increased APE, and increased energy dissipation and freshwater stabilization by eddies.
Quote
Implications for the changing Arctic
Increases in the eddy diffusivity and increased mixing by eddy activity in a more energetic Arctic Ocean is also expected to enhance vertical transport of warm Atlantic water, with consequences for sea ice growth and mixing of biogeochemical tracers.

30
Arctic sea ice / Re: Arctic Ocean salinity, temperature and waves
« on: February 08, 2020, 08:24:59 PM »
Thanks Bruce Steele, who would have thought eddies were so important?
here are the temp/salinity charts, 7-200m
https://www.whoi.edu/page.do?pid=165196
microcat1 at 5m depth

31
Developers Corner / Re: thread lock test
« on: February 08, 2020, 03:09:08 PM »
nearly day3

32
Arctic sea ice / Re: MOSAiC news
« on: February 08, 2020, 02:52:00 PM »
It's rush hour. Which is KD?

33
Arctic sea ice / Re: MOSAiC news
« on: February 08, 2020, 12:12:41 PM »
PS drifted gently north yesterday, shorter timescale, feb1-8
256frames@12fps -updated below
KD heading for a lead at 0320utm this morning, 88 82.25N 68.77E, barely visible on the jpg
https://www.polarview.aq/arctic, not sure how long this link to the jp2 viewer will last
Latest position from cruisemapper is 82:39'35", 74:23'58". It appears to be following the line of the lighter, probably newer ice

edit: Cruisemapper Local time 2020-02-08 19:31, sailwx data stops on feb4


34
Arctic sea ice / Re: MOSAiC news
« on: February 07, 2020, 04:17:07 PM »
Quote
the lat-long grid is erased by the progression of buoy location
macid's original code uses R gganimate to create the animations. Adding the graticule from plotSvalbard slows down the process by 5-6 times, making a 5m job take 30mins. So I use a tip from A-Team to create the graticule with a 2frame animation, which takes a minute, clean up a couple of buoy dots, delete the second frame and insert it into the long animation at frame2.
Add an alpha channel to the frame, set white to transparent and merge it down to the first frame.
Much quicker, but the buoy paths overwrite the grat as they go along.
It's eco, saving the planet by using less processing power lol
mostly running on solar for 8mths/yr

Had a look for KD on S1B but all I could find was this. Looks more like a plane. cffr

35
Arctic sea ice / Re: Arctic Ocean salinity, temperature and waves
« on: February 07, 2020, 01:19:38 PM »
chukchi export. Ice movement revealing underlying current or bathy perhaps. ctr

36
Developers Corner / Re: thread lock test
« on: February 07, 2020, 11:41:37 AM »
day2

37
Arctic sea ice / Re: MOSAiC news
« on: February 07, 2020, 10:47:39 AM »
drift update, headed north west again yesterday. Here showing only points and coordinates. ctr

38
Arctic sea ice / Re: MOSAiC news
« on: February 06, 2020, 11:49:40 PM »
Gulp. Those calculations would be great if my labelling was correct. p193 ends at  87.5737,96.4523 on the last ani. I've corrected the labelling which is still done manually.

39
Developers Corner / Re: Test space
« on: February 06, 2020, 10:49:09 PM »
testing compression crf31 1000frames
glitch at the join, poor layer alignment - removed

40
Developers Corner / Re: Test space
« on: February 06, 2020, 10:34:11 PM »
pt2 oct21-nov11 - removed

41
Developers Corner / Re: Test space
« on: February 06, 2020, 08:52:41 PM »
and the size for posting longer series - removed

42
Developers Corner / Re: Test space
« on: February 06, 2020, 08:42:58 PM »
same thing, compression crf29 with white grat removed

43
Developers Corner / thread lock test
« on: February 06, 2020, 07:58:45 PM »
day1 in the locked thread

44
Arctic sea ice / Re: Arctic Ocean salinity, temperature and waves
« on: February 06, 2020, 07:41:43 PM »
From the rammb thread
Now that polar night is descending on the arctic, it's time to switch to band I04, shortwave IR discerns temperature.
link to location.
North of Svalbard/Yermak Plateau. The (hopefully) never ending battle between sea ice and the warm west spitzbergen current

45
Arctic sea ice / Re: MOSAiC news
« on: February 06, 2020, 01:45:27 PM »
Probably not a bad route. Quite a lot of new refreeze on the way.
unihamburg amsr2-uhh, fjl, jan29-feb5. (north is left)
added a closer look from rammb (north is down)
Great, 3 images in a row with different orientation
Hmm, maybe they'll drop a few buoys in that area. That would be interesting

46
Arctic sea ice / Re: MOSAiC news
« on: February 06, 2020, 12:13:25 PM »
data updated today, drift headed north west over  the last 2 days. Forgot to change the frame size so the ani is larger. ctr
770 frames@24fps
edit: corrected the longitude labelling.

47
Arctic sea ice / Re: MOSAiC news
« on: February 06, 2020, 01:44:39 AM »
Nice aspect ratio for wide screen. Some leads persist for a long time as lower concentration blobs.

Not many buoy 'proc' files were updated today. There are other unprocessed files providing latlon that we can use. Example from p201
DataId,CommId,DeviceName,DeviceDateTime,BatteryVoltage,GpsQuality,Latitude,Longitude,SubmergedBoolean,Temperature0cm,AccelerometerVariance,SamplingRate
24309464,"300234068912800","OSU-IT-0014",2020-02-05 21:00:25,10.5,3,87.524023,94.845873,0,,3,30
24309463,"300234068912800","OSU-IT-0014",2020-02-05 20:30:54,10.5,3,87.52297,94.856868,0,,3,30
https://data.meereisportal.de/download/buoys/2019P201_300234068912800.csv

Will look at that if they don't come back tomorrow. Different format so would require some small code changes.

48
Developers Corner / Re: Test space
« on: February 06, 2020, 12:58:00 AM »
testing oct1-21 with daily movement of PS loc where available. Probably have to change to white graticule
or..testing with less compression. much better but way too big a file size for forum. It'll just have to be smaller or ditch the nullschool layer.
removed

49
Developers Corner / Re: Test space
« on: February 04, 2020, 09:46:10 PM »
buoys in wychspace
need to add the nullschool data and get the labelling sorted. Maybe best to use daily PS loc, though it will partially obscure the close buoys
looks like my original labelling is incorrect. There are quite a few other errors.
nullschool labelling is incorrect-forgot to triple the frames - had enough for one day
removed

50
Arctic sea ice / Re: MOSAiC news
« on: February 04, 2020, 11:57:35 AM »
The art of moving without moving.
Here breaking out best time detail with 715 frames at 24fps.

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