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uniquorn

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Re: What the Buoys are telling
« Reply #1950 on: August 12, 2020, 09:13:16 PM »
t74, melted out, jul15-aug10
t75, melted out, jul15-aug7
t76, looks like big melt pond, jul15-21
t79, jul15-31

« Last Edit: August 12, 2020, 09:18:50 PM by uniquorn »

uniquorn

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Re: What the Buoys are telling
« Reply #1951 on: August 12, 2020, 09:41:51 PM »
Tbuoy drift and locations, some final.

uniquorn

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Re: What the Buoys are telling
« Reply #1952 on: August 13, 2020, 12:13:44 AM »
whoi ftp server is back up again. Many thanks to Rick Krishfield for that :)
Here is itp114, day213-225, after the last high drift speed event. 7-40m temps varying ~0.2C. Larger variations at 70m.

uniquorn

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Re: What the Buoys are telling
« Reply #1953 on: September 26, 2020, 03:12:36 PM »
Mosaic T78 and T81 at 89.6N both almost flatlining again at ocean temperature.

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Re: What the Buoys are telling
« Reply #1954 on: September 26, 2020, 05:27:25 PM »

uniquorn

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Re: What the Buoys are telling
« Reply #1955 on: September 27, 2020, 01:17:03 PM »
experimental large presentation of the last 6days of iabp buoys showing overview and close up (by zooming and scrolling). whoi itp buoys haven't updated on iabp since sep21.
updated below
« Last Edit: September 29, 2020, 01:00:15 AM by uniquorn »

uniquorn

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Re: What the Buoys are telling
« Reply #1956 on: September 27, 2020, 11:23:55 PM »
Ignatius Rigor from the IABP talks about testing buoy sensors and buoy deployment.
http://www.apl.washington.edu/project/project.php?id=arctic_buoys

« Last Edit: September 27, 2020, 11:43:57 PM by uniquorn »

uniquorn

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Re: What the Buoys are telling
« Reply #1957 on: September 29, 2020, 12:40:04 AM »
great. Thanks to Ignatius and Wendy, WHOI itp buoys are back on IABP. So here is a larger presentation showing overview and close up. It's one day shorter to keep file size down. This is probably close enough to show inertial oscillations. A bit like osi-saf on steroids.
itp103 looks very straight
updated below
« Last Edit: September 30, 2020, 12:02:48 AM by uniquorn »

uniquorn

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Re: What the Buoys are telling
« Reply #1958 on: September 29, 2020, 12:56:27 PM »
T78 and T81 temperature charts at ~89.3N today

uniquorn

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Re: What the Buoys are telling
« Reply #1959 on: September 29, 2020, 11:39:16 PM »
iabp buoy drift update, 5days. I think this will be the size, just need to think about the crop.
itp120 and 121 not on iabp yet

drift speeds of the first 5 buoys
« Last Edit: September 30, 2020, 12:05:15 AM by uniquorn »

uniquorn

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Re: What the Buoys are telling
« Reply #1960 on: October 03, 2020, 11:06:09 PM »
iabp drift update
whoi buoys not updated again

uniquorn

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Re: What the Buoys are telling
« Reply #1961 on: October 05, 2020, 09:36:13 PM »
buoys north of 45N, apr-oct. Best viewed at half speed.
moved to test space
« Last Edit: October 05, 2020, 09:50:21 PM by uniquorn »

uniquorn

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Re: What the Buoys are telling
« Reply #1962 on: October 08, 2020, 07:10:06 PM »
iabp drift update with surface temperatures (where available) roughly every 3hrs, oct3-8
click twice and scroll
edit: some reported temperatures look questionable
« Last Edit: October 08, 2020, 09:02:33 PM by uniquorn »

uniquorn

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Re: What the Buoys are telling
« Reply #1963 on: October 14, 2020, 10:12:41 PM »
overview of 50m temperature from whoi itp buoys, 2006-2020.

uniquorn

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Re: What the Buoys are telling
« Reply #1964 on: October 15, 2020, 10:48:20 PM »
A closer look at the Atlantic side temperatures at 80m depth. Max temp has been capped at -0.8C to show detail along the transpolar drift line. This means that some data is not shown fully at the Yermak plateau. I plan to look at that in more detail later.
« Last Edit: October 15, 2020, 10:56:44 PM by uniquorn »

A-Team

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Re: What the Buoys are telling
« Reply #1965 on: October 16, 2020, 12:26:10 AM »
Quote
A closer look at the Atlantic side temperatures at 80m depth
Amazing. From Sept 2006 on! Has anyone has ever put buoy data together across projects before?

A wake version might have some advantages in synchronicity as the older tracks fade out rather than pile up. Normally kriging would be used as the interpolative technique to infill temperatures between the buoys into a continuously colored field. Here it would have to be time-dependent kriging(t). However, it seems like just thickening buoy tracks accomplishes this more easily with variable wake retention time windowing (discretizing) the approximation to kriging(t).

Calendar cyclicity might also be informative. Here tracks would only appear at their designated day number regardless of year. Some confusion might arise for multi-year buoys. Even at 80m, there may be seasonality trends in temperature in locations with tidal or near-inertial turbulence.

It is just two quick sorts if the current ordering has separate IMEI year month day columns.

« Last Edit: October 16, 2020, 12:38:53 AM by A-Team »

uniquorn

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Re: What the Buoys are telling
« Reply #1966 on: October 16, 2020, 09:07:22 PM »
something like splitting seasons at day265. Working on that

uniquorn

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Re: What the Buoys are telling
« Reply #1967 on: November 03, 2020, 12:13:46 AM »
iabp drift and surface temperature
removed, was a bit large at 15MB
« Last Edit: November 03, 2020, 01:19:43 AM by uniquorn »

uniquorn

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Re: What the Buoys are telling
« Reply #1968 on: November 03, 2020, 03:10:56 PM »
iabp drift and surface temperature oct27-nov2
smaller pixel size, 13MB

SimonF92

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Re: What the Buoys are telling
« Reply #1969 on: November 04, 2020, 05:48:43 PM »
Still trying to clean up the very dirty data out of the IABP
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uniquorn

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Re: What the Buoys are telling
« Reply #1970 on: November 26, 2020, 10:49:59 PM »
whoi itp121 50m temperatures in the Beaufort were very close to 2C again today.

Quote
2020  331.03258   44    1.1299   30.1789
2020  331.03249   46    1.7846   30.3549
2020  331.03240   48    1.9994   30.5065
2020  331.03230   50    1.9087   30.6098
2020  331.03221   52    1.4870   30.7180
2020  331.03212   54    0.9313   30.7859
2020  331.03203   56    1.4279   30.8602

Had a look at salinity at 50m since 2007. Possibly a touch higher this year but mostly just warmer along the 121 drift path.

uniquorn

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Re: What the Buoys are telling
« Reply #1971 on: December 11, 2020, 08:34:57 PM »
iabp drift update, dec1-11  (9.5MB)
Still some movement south of the Mclure Strait
Drift reversal in the Beaufort
Spaghetti close to the Yermak Plateau
Mosaic buoys making steady progress towards Fram
« Last Edit: December 11, 2020, 08:42:48 PM by uniquorn »

uniquorn

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Re: What the Buoys are telling
« Reply #1972 on: December 11, 2020, 09:57:11 PM »
whoi itp121 update.
Drifted back into the ~50m warm zone. This may give us a better chance to map it with itp120 also nearing itp121's deployment location.

52m-58m over 2C
Quote
2020   345.25325   48   1.8761   30.5395
2020   345.25333   50   1.9683   30.6382
2020   345.25341   52   2.0335   30.7441
2020   345.2535     54   2.1183   30.8525
2020   345.25358   56   2.1151   30.9513
2020   345.25367   58   2.0266   31.0404
2020   345.25375   60   1.9014   31.1142
2020   345.25383   62   1.756   31.177
« Last Edit: December 11, 2020, 10:02:31 PM by uniquorn »

uniquorn

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Re: What the Buoys are telling
« Reply #1973 on: December 15, 2020, 12:57:10 AM »
What some old buoys said. iabp 1979-81
edit: https://iabp.apl.uw.edu/Data_Products/BUOY_DATA/
BuoyID,Year,Hour,DOY,Lat,Lon,BP,Ts
« Last Edit: December 15, 2020, 03:36:09 PM by uniquorn »

SimonF92

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Re: What the Buoys are telling
« Reply #1974 on: December 15, 2020, 01:12:08 PM »
Any other metrics except speed (location) provided with these old buoys? Would you mind linking the data?
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uniquorn

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Re: What the Buoys are telling
« Reply #1975 on: December 15, 2020, 09:13:54 PM »
@SimonF92, would be very interested in avg drift speed/mth if possible per region(lon?). Your charts are better (probably quicker) than mine.

Here are old iabp buoys drift 1982-84. Not much gyre in this one.
« Last Edit: December 15, 2020, 09:21:58 PM by uniquorn »

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Re: What the Buoys are telling
« Reply #1976 on: December 15, 2020, 10:20:57 PM »
Nice idea, will look into this
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uniquorn

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Re: What the Buoys are telling
« Reply #1977 on: December 15, 2020, 10:28:33 PM »
You may have to treat the alaskan coast as a special case

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Re: What the Buoys are telling
« Reply #1978 on: December 15, 2020, 10:31:38 PM »
Im going to have to think about it quite thoroughly because the buoys transition from one region to another over time. Will drop data off the alaskan coast initially too
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uniquorn

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Re: What the Buoys are telling
« Reply #1979 on: December 17, 2020, 12:09:58 AM »
old iabp buoys drift 1985-87.
itp121, last 4 profiles(171-174)
« Last Edit: December 17, 2020, 12:58:49 AM by uniquorn »

uniquorn

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Re: What the Buoys are telling
« Reply #1980 on: December 17, 2020, 09:43:16 PM »
old iabp buoys drift 1987-89

HapHazard

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Re: What the Buoys are telling
« Reply #1981 on: December 18, 2020, 11:43:51 AM »
Great stuff, as always. Very interesting, that one. Thanks for everything.
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Re: What the Buoys are telling
« Reply #1982 on: December 21, 2020, 12:30:03 PM »
uniquorn, finally got a good window to write this code, but cant find the old 1980s data- could you provide a link? Its not here:

https://iabp.apl.uw.edu/maps_daily_table.html

/////////////// scratch that, I found it here :
https://iabp.apl.uw.edu/Data_Products/BUOY_DATA/3HOURLY_DATA/1979/
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Re: What the Buoys are telling
« Reply #1983 on: December 21, 2020, 05:21:44 PM »
Getting there with this, need to add regions- suspicious of the change at 1986
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Re: What the Buoys are telling
« Reply #1984 on: December 21, 2020, 05:44:24 PM »
Becomes far more meaningful with locations, are we on to something interesting here?
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Re: What the Buoys are telling
« Reply #1985 on: December 21, 2020, 07:29:23 PM »
I figured the colors meant something like that, Simon! 
Just a brainstorm guess, but might there have been a change in published units in 1986? (Minutes to Milliradians, or something...  :-\)
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Re: What the Buoys are telling
« Reply #1986 on: December 21, 2020, 09:04:25 PM »
I figured the colors meant something like that, Simon! 
Just a brainstorm guess, but might there have been a change in published units in 1986? (Minutes to Milliradians, or something...  :-\)

Thanks Tor, that's a really good point and something i had already bounced off my friend who is a pilot. His response was similar to yours:

"Maybe gone from normal degrees and minutes to decimal degrees"

I will try to figure out the issue and work on a conversion.

Up to 1996 there are 3,000,000 rows of data so may my computer rest in peace when i try to use the full dataset to 2020.
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oren

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Re: What the Buoys are telling
« Reply #1987 on: December 21, 2020, 09:53:52 PM »
Amazing stuff. Keep up the good work uniquorn and Simon.

uniquorn

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Re: What the Buoys are telling
« Reply #1988 on: December 21, 2020, 11:30:26 PM »
Quote
BuoyID,Year,Hour,DOY,Lat,Lon,BP,Ts
3161,1985,18,363.75,70.382,237.543,1010.75500,-25.60900
3161,1985,21,363.875,70.367,237.546,1011.57300,-27.00900
3161,1986,18,1.75,70.317,-122.276,1017.96774,-29.97823
3161,1986,21,1.875,70.318,-122.288,1018.32592,-29.68675

3164,1985,12,365.5,72.994,215.895,1024.58500,-34.32100
3164,1985,15,365.625,72.988,215.904,1023.66000,-34.10000
3164,1986,12,1.5,72.944,-144.147,-999.90000,-999.90000
3164,1986,15,1.625,72.952,-144.140,1018.92558,-29.83742

Not sure how you're calculating velocity but Longitude changes from pos360° to +-180° in 1986.
In the middle of a file ?!
The r animation didn't bat an eyelid lol. (or maybe it did, will check)

Quote
#calc distance with haversine
drift <- 0
for (i in 2:nrow(data)){
  if(data$BuoyID==data$BuoyID[i-1]){
  drift <- distHaversine(c(data$Lon,data$Lat),c(data$Lon[i-1],data$Lat[i-1]),r=6378137)/((as.numeric(data$DOY)-as.numeric(data$DOY[i-1]))*86400)
  }else(drift  <- 0 )
  }
« Last Edit: December 21, 2020, 11:46:42 PM by uniquorn »

SimonF92

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Re: What the Buoys are telling
« Reply #1989 on: December 22, 2020, 10:16:13 AM »
Ah this explains it.

In 1986 therefore, the Lon values effectively became compressed by a factor of 2 in the raw data- which is pretty much reflected in the figure. 0-360 became -180:0:180. I should be able to convert pretty easily.

Currently using pythagoras to calculate distance a2=b2+c2 (treating the surface as a plane), but i was intending on using haversine if i ever got it figured out so thanks very much for posting your code.


//////////////// PS, would welcome criticism of my Arctic-donut approach to defining region (will also be bugged before 1986):

lon=(df.Lon.values.tolist())
lat=(df.Lat.values.tolist())

locations=[]

for lon_i,lat_i in zip(lon,lat):


    if lat_i > 80:
        location='Central Arctic Basin'
    else:
        if lon_i > -161 and lon_i < -125:
            location= 'Beaufort'
        elif lon_i > 148 and lon_i < 178:
            location= 'ESS'
        elif lon_i > 95 and lon_i < 148:
            location= 'Laptev'
        elif lon_i > 56 and lon_i < 95:
            location= 'Kara'
        elif lon_i > 16 and lon_i < 56:
            location= 'Barents'
        elif lon_i > -15 and lon_i < 16:
            location= 'Greenland'
        else:
            location= 'Chukchi'
           

    locations.append(location)
       
       
df['location']= locations
« Last Edit: December 22, 2020, 10:39:21 AM by SimonF92 »
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oren

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Re: What the Buoys are telling
« Reply #1990 on: December 22, 2020, 10:35:01 AM »
Nice explanation. It's weird they didn't back-change the data to match the current format.

uniquorn

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Re: What the Buoys are telling
« Reply #1991 on: December 22, 2020, 12:36:17 PM »
From 1991 to 1998 year data is truncated to 2 digits 91, 92 etc, then goes back to 4 digits in 1999. Things settle down after that. Duplicate .dat files are introduced in 2011 but it's probably easier to stay with .csv till the 3hourly data ends in 2016

Full res data (60m, 30m or10m) starts in 2004 with what may be a test then only a few buoys till 2010 after which there are many. I haven't checked if they are duplicates of the 3hourly of the same years.

I'm still juggling with data formats before posting more animations.

uniquorn

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Re: What the Buoys are telling
« Reply #1992 on: December 22, 2020, 05:54:58 PM »

//////////////// PS, would welcome criticism of my Arctic-donut approach to defining region (will also be bugged before 1986):

lon=(df.Lon.values.tolist())
lat=(df.Lat.values.tolist())
locations=[]
for lon_i,lat_i in zip(lon,lat):
    if lat_i > 80:
        location='Central Arctic Basin'
    else:
        if lon_i > -161 and lon_i < -125:
            location= 'Beaufort'
        elif lon_i > 148 and lon_i < 178:
            location= 'ESS'
        elif lon_i > 95 and lon_i < 148:
            location= 'Laptev'
        elif lon_i > 56 and lon_i < 95:
            location= 'Kara'
        elif lon_i > 16 and lon_i < 56:
            location= 'Barents'
        elif lon_i > -15 and lon_i < 16:
            location= 'Greenland'
        else:
            location= 'Chukchi'     
    locations.append(location)   
df['location']= locations
A couple of suggestions to align a bit closer to wipneus and nsidc. I think 80N is a good compromise.
if lon_i > -157 and lon_i < -125:     ## utqiagvic as marker
            location= 'Beaufort'
        elif lon_i > 145.5 and lon_i < 178:
            location= 'ESS'
        elif lon_i > 97 and lon_i < 145.5:  ##mid NSI
            location= 'Laptev'
        elif lon_i > 64 and lon_i < 97:
            location= 'North Kara'  ##not many buoys in Kara anyway?
        elif lon_i > 16 and lon_i < 64:
            location= 'Barents'
        elif lon_i > -45 and lon_i < 16:  ##coastal drift might be interesting
            location= 'Greenland'
        else:                   ## 157 to 178 though this will include bering, cutoff at 66.5N?
            location= 'Chukchi' ##probably best to define chukchi or it may pick up CAA/baffin outliers

SimonF92

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Re: What the Buoys are telling
« Reply #1993 on: December 22, 2020, 10:19:41 PM »
Thanks uniquorn, appreciate your help with this. Agree about Chukchi. Going to get stuck into this over the next few days
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uniquorn

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Re: What the Buoys are telling
« Reply #1994 on: December 22, 2020, 11:30:08 PM »
Looking forward to another visit from macid sometime, is leagues ahead of me.

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Re: What the Buoys are telling
« Reply #1995 on: December 23, 2020, 02:03:26 PM »
It is taking me about 30min each time to mine the data now, but thanks to all the useful help here and a bit of googling I have corrected the 1986 conversion issue. Uniquorn has shown me the haversine method.

I am really interested to see if mean velocity per region changes in the 00's and 10's.
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Tor Bejnar

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Re: What the Buoys are telling
« Reply #1996 on: December 23, 2020, 04:48:09 PM »
This is very interesting work you're doing, Simon!

Is this graph saying that ice (as recorded by buoys) moves in some regions at a fairly steady pace while in the CAB it moves slowly to quickly?  Watching A-Team's movies, doesn't the ice stop moving sometimes - i.e., it moves in a jerking motion?

What are the 13 or so dots on the right side of the graph (way after 2020)?  Data points without a year?
Arctic ice is healthy for children and other living things because "we cannot negotiate with the melting point of ice"

SimonF92

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Re: What the Buoys are telling
« Reply #1997 on: December 23, 2020, 05:57:52 PM »
This is very interesting work you're doing, Simon!

Is this graph saying that ice (as recorded by buoys) moves in some regions at a fairly steady pace while in the CAB it moves slowly to quickly?  Watching A-Team's movies, doesn't the ice stop moving sometimes - i.e., it moves in a jerking motion?

What are the 13 or so dots on the right side of the graph (way after 2020)?  Data points without a year?

Yes Tor, definitely more within and between-buoy velocity variability in the CAB, though generally the velocity is slower than in some peripheral seas. You can actually follow individual buoys in scatter by following strings of dots.

Doing that is what led me to realise that IABP have discovered teleportation, because many buoys appear to teleport from the Greenland Sea to Chukchi (its clearly bugged)

Regional means per day (1979-2000):


PS, yes I think those are orphaned data points





///////// update i fixed the location bug by adding more flow control, those buoys are the ones moving out of the arctic :)
Bunch of small python Arctic Apps:
https://github.com/SimonF92/Arctic

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Re: What the Buoys are telling
« Reply #1998 on: December 24, 2020, 05:24:09 PM »
back to the present with a drift update, nov24-dec23

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Re: What the Buoys are telling
« Reply #1999 on: December 24, 2020, 05:35:03 PM »
Regional means per day (1979-2000):
If you are still using pythagoras on LatLon for distance that will affect velocity calcs. Longitude distances get very small closer to 90°N