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gerontocrat

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Greenland 2022-23 SMB, melting and GRACE mass
« on: September 03, 2022, 10:40:31 AM »
It's a new Greenland year as far as DMI is concerned for SMB data,  and I have NOT set up new graphs. Which is a pity, because on the 2nd September unusually intense warmth rain and melt entered Western Greenland. The melt (on 21% of Greenland's surface area) may well be a record for this day.

It also looks like the melt event will last until Monday, with maximum melt today (3rd Sept) and tomorrow (4th Sept)

click images to enlarge
« Last Edit: September 03, 2022, 10:51:27 AM by gerontocrat »
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oren

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Re: Greenland 2022-23 SMB, melting and GRACE mass
« Reply #1 on: September 03, 2022, 10:52:45 AM »
Thanks for starting the new thread Gero, and in general for keeping us up to date.

gerontocrat

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Re: Greenland 2022-23 SMB, melting and GRACE mass
« Reply #2 on: September 04, 2022, 09:15:31 AM »
Melt such as this should not be happening as late as the 3rd September.
This warmth & wet (much of it rain) looks like continuing for a couple more days.

All part of the transition of the Arctic into a warmer, wetter place.
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gerontocrat

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Re: Greenland 2022-23 SMB, melting and GRACE mass
« Reply #3 on: September 05, 2022, 11:46:44 AM »
Melt even higher on this day - 4th September.
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sidd

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Re: Greenland 2022-23 SMB, melting and GRACE mass
« Reply #4 on: September 05, 2022, 10:23:20 PM »
Thats a disturbing picture, almost all of south dome including the saddle at 67N is melting. And this is quite late in the year ...

sidd

gerontocrat

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Re: Greenland 2022-23 SMB, melting and GRACE mass
« Reply #5 on: September 06, 2022, 02:44:46 PM »
Data as at 5th Sep

Another day of extreme melt, espcially for early September.
Some more days of above average melt likely.

But not much sign of high run-off in the SMB data,

I also attach for interest a gif on Freya Glascier (NE Greenland) 4.4 mb.

click gifs to start - run 5 times
« Last Edit: September 07, 2022, 11:34:29 AM by gerontocrat »
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gerontocrat

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Re: Greenland 2022-23 SMB, melting and GRACE mass
« Reply #6 on: September 06, 2022, 07:51:35 PM »
JPL have produced Greenland Ice Mass change data from JPL to July 22.

1st graph attached links that data to SMB change from DMI from Oct 2018.

2nd graph is GRACE data from 2002 to July 22.

click images to enlarge
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gerontocrat

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Re: Greenland 2022-23 SMB, melting and GRACE mass
« Reply #7 on: September 07, 2022, 11:40:01 AM »
Data as at 5th Sep

Another day of very high melt, especially for early September.
Some more days of above average melt likely.
"Para a Causa do Povo a Luta Continua!"
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gerontocrat

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Re: Greenland 2022-23 SMB, melting and GRACE mass
« Reply #8 on: September 09, 2022, 12:21:47 PM »
Data as at 8th Sep

Although the peak has passed, another day of above average melt
Some more days of above average melt possible, perhaps prolonging the melt season as far as mid-September.

SMB gain so far a bit below average. The Accumulated SMB anomaly graph shows the influence of melt on run-off in early September

gif runs five times, click to start
click images to enlarge
« Last Edit: September 09, 2022, 12:35:13 PM by gerontocrat »
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Tor Bejnar

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Re: Greenland 2022-23 SMB, melting and GRACE mass
« Reply #9 on: September 09, 2022, 05:27:42 PM »
How unusual is the 'new fiscal year' melt?  It is way way above 'average' but how about comparing it to other extreme years?  (I recall that some graphs showing melt indicate the historical range, less the two most extreme year's data [both high and low], or something like that (i.e., not 2 sigma as is common).
Arctic ice is healthy for children and other living things because "we cannot negotiate with the melting point of ice"

gerontocrat

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Re: Greenland 2022-23 SMB, melting and GRACE mass
« Reply #10 on: September 09, 2022, 07:40:29 PM »
How unusual is the 'new fiscal year' melt?  It is way way above 'average' but how about comparing it to other extreme years?  (I recall that some graphs showing melt indicate the historical range, less the two most extreme year's data [both high and low], or something like that (i.e., not 2 sigma as is common).
The DMI graphs exclude the two most extreme year's data [both high and low]

DMI (about a year or 2 ago) to publish daily data of SMB change and melt %, starting from Sept 2017 (SMB data) and Feb 2018 (Melt data). These can be found at http://ensemblesrt3.dmi.dk/data/prudence/temp/PLA/PP_GSMB/

However, they have not published the data of the long-term averages of daily SMB change and daily melt, which is a drag.

As regards the early September melt, looking at the DMI graph the Sept to Sept 6 look to be records for the day of the year. From my data early Sept 2021 managed a max of 13%, in the earlier years 6% to 8%.

Definitely early Sept 2022 has been an event worth noting, building on the high but not extreme values of last year.

AND..
NSIDC at  http://nsidc.org/greenland-today/greenland-today-data-and-analysis-tools/ produced a spreadsheet of daily melt data which dates back to 1978-79, which I used to downlaoad.

However, it is held on the net at an ftp address, so I have only got data to 2020. (I have asked NSIDC for help on this) -

I attach 2 graphs from this data - UP TO 2020. From these it still looks as if the September 2-7 2022 data is a record-breaker by far.

AND...
Here is the Graph from Greenland Today which also make it obvious that 2022 is a record
« Last Edit: September 09, 2022, 08:31:10 PM by gerontocrat »
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Tor Bejnar

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Re: Greenland 2022-23 SMB, melting and GRACE mass
« Reply #11 on: September 09, 2022, 09:20:35 PM »
Quote
Definitely early Sept 2022 has been an event worth noting, building on the high but not extreme values of last year.
Thanks for checking, geront!  (Or should it be Mr. O'Crat? :) )
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sidd

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Tor Bejnar

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Re: Greenland 2022-23 SMB, melting and GRACE mass
« Reply #13 on: September 09, 2022, 11:55:46 PM »

image from that NASA publication. (Thanks sidd.)

Greenland did have a similar melt event a week earlier, once.
Arctic ice is healthy for children and other living things because "we cannot negotiate with the melting point of ice"

gerontocrat

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Re: Greenland 2022-23 SMB, melting and GRACE mass
« Reply #14 on: September 11, 2022, 10:07:39 AM »
Data as at 10th Sept

Above average daily melt continues.

SMB gain to date a wee bit below average

click gif to start, runs 5 times.
click images to enlarge
"Para a Causa do Povo a Luta Continua!"
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gerontocrat

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Re: Greenland 2022-23 SMB, melting and GRACE mass
« Reply #15 on: September 14, 2022, 12:07:53 PM »
Data as at 13th Sept

Above average daily melt continues, and looks like continuing for a few days more

SMB gain to date a wee bit below average. The cumulative SMB image shows above average melt loss on the coast.
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gerontocrat

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Re: Greenland 2022-23 SMB, melting and GRACE mass
« Reply #16 on: September 14, 2022, 12:43:57 PM »
And this is what the data looks from NSIDC's Greenland today data

NSIDC have now given me the direct link to the spreadsheet which is  https://daacdata.apps.nsidc.org/pub/DATASETS/nsidc0755_nrt_greenland_melt_v1/

Notev you have to sign up to NASA's EarthData - which is easy
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gerontocrat

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Re: Greenland 2022-23 SMB, melting and GRACE mass
« Reply #17 on: September 17, 2022, 08:35:13 AM »
Data as at 16th Sept

Above average daily melt continues, and looks like continuing for maybe 2 days more

SMB gain to date a wee bit below average. The cumulative SMB anomaly image shows well above average melt loss on the coast.
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gerontocrat

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Re: Greenland 2022-23 SMB, melting and GRACE mass
« Reply #18 on: September 19, 2022, 08:54:34 AM »
Data as at 18th Sept

September continues to be an unusually energetic month

Well above average daily melt continues, but looks like falling back after today. However there may be another melt spike from 23rd to 25th September.

SMB gain to date rises to average due to high precipitation in the last few days. The cumulative SMB anomaly image shows well above average melt loss on the coast.
"Para a Causa do Povo a Luta Continua!"
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gerontocrat

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Re: Greenland 2022-23 SMB, melting and GRACE mass
« Reply #19 on: September 22, 2022, 05:45:01 PM »
DMI not updated for the last 2 days so here is melt using data from NSIDC's Greenland Today
Data as at 20th Sept

September continues to be an unusually energetic month

Well above average daily melt continues. There may be another melt spike from Friday 23rd to Tuesday 27th September as the remains of hurricane Fiona push into Baffin Bay.

EDIT: The record maximum cumulative melt in September to October before 2022 was in 2010, which at 2 million km2 compares with previous maxima in 2002 and 2003 at 1.6 and 1,9 million km2. At 3.2 million 2022 cumulative area melt to 20 September is definitely remarkable, with some more melt to come.

ANOTHER EDIT:- This late melt in 2022 is after what was a somewhat feeble melt season up to the end of August (see last image)

This is likely to include signicant rainfall on the South & West coasts and snow at higher altitudes.
« Last Edit: September 22, 2022, 06:30:55 PM by gerontocrat »
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gerontocrat

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Re: Greenland 2022-23 SMB, melting and GRACE mass
« Reply #20 on: September 23, 2022, 11:10:54 AM »
Data as at 22nd Sept

DMI updated after 2 days asleep.

September continues to be an unusually energetic month

Well above average daily melt continued although at a lower rate. However, thanks to the remains of Hurricane Fiona, it looks like another melt spike from today to the 25th or 26th September.

SMB gain to date rises to average. The cumulative SMB anomaly image shows well above average melt loss on the coast.

click images to enlarge
click gif to start - runs 5 times
"Para a Causa do Povo a Luta Continua!"
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gerontocrat

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Re: Greenland 2022-23 SMB, melting and GRACE mass
« Reply #21 on: September 23, 2022, 03:51:09 PM »
Freya Glacier

It has snowed.
It is cold
"Para a Causa do Povo a Luta Continua!"
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gerontocrat

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Re: Greenland 2022-23 SMB, melting and GRACE mass
« Reply #22 on: September 24, 2022, 10:22:04 AM »
Data as at 23rd Sept

September continues to be an unusually energetic month

Well above average daily melt continued although at a lower rate. The remains of Hurricane Fiona look like continuing to cause another melt spike up to the 25th or 26th September.

SMB gain on this day very high. Precipitation included rain on the SW coast, with more to come.
"Para a Causa do Povo a Luta Continua!"
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gerontocrat

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Re: Greenland 2022-23 SMB, melting and GRACE mass
« Reply #23 on: September 25, 2022, 01:01:40 PM »
Data as at 24th Sept

September continues to be an unusually energetic month

Well above average daily melt continued. The remains of Hurricane Fiona look like continuing to cause melt spikes up to the 26th or 27th September.

SMB gain on this day extremely high. Precipitation included rain on the South coast, with more to come.
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gerontocrat

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Re: Greenland 2022-23 SMB, melting and GRACE mass
« Reply #24 on: September 26, 2022, 03:55:24 PM »
Data as at 25th September

Somewhat above average melt on the 25th Sept

But today, the 26th, looks like the last burst of really significant melt as Fiona fades into history.
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gerontocrat

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Re: Greenland 2022-23 SMB, melting and GRACE mass
« Reply #25 on: September 27, 2022, 10:37:12 AM »
Data as at 26th September

Daily melt rose to 12% - looks like the last spike in this unique September

Accumulated SMB continues above average

click images to enlarge
"Para a Causa do Povo a Luta Continua!"
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