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Author Topic: Greenland 2022-23 SMB, melting and GRACE mass  (Read 40068 times)

Alexander555

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Re: Greenland 2022-23 SMB, melting and GRACE mass
« Reply #200 on: September 01, 2023, 11:44:23 PM »
I mean the numbers. Gains - surface melt, and i think there is a correction for bottom melt. And the loss from glaciers. Or is the total at the end of the year ?

sidd

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Re: Greenland 2022-23 SMB, melting and GRACE mass
« Reply #201 on: September 02, 2023, 08:27:50 AM »
Re: astonished that they can go it

It is a brilliant experiment. I went to grad school with somebody who worked on the first GRACE series. Then there was GOCE and then the GRACE Follow On and i hope they can find the funding to keep the series going.

Can't hide from gravity.

sidd

Alexander555

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Re: Greenland 2022-23 SMB, melting and GRACE mass
« Reply #202 on: September 02, 2023, 12:32:40 PM »
It's ok, i already know. The edge sufferd in a big way. The extra snow on top of the ice sheet is maybe good to slow down sea level rise a little bit.

gerontocrat

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Re: Greenland 2022-23 SMB, melting and GRACE mass
« Reply #203 on: September 04, 2023, 11:35:06 AM »
DMI data as at 3rd September from http://polarportal.dk/en/greenland/surface-conditions/ & https://ensemblesrt3.dmi.dk/data/prudence/temp/PLA/PP_GSMB/

Daily SMB For SMB it is a new year fpr DMI.

However, DMI uses the calendar year for melt data.
Daily melt down to average  at 7%.

Accumulated melt at 33.63 equivalent 100% days is 18% above the 2017-2022 total for the year.

I will not be posting daily during the winter unless there is a big surprise.

"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 #204 on: September 09, 2023, 10:00:29 PM »
Here is the latest analysis from NSIDC Greenland Today data

NSIDC GREENLAND TODAY ACCUMULATED MELT:  32,647,501 KM2 as at 08-Sep-2023

- Melt  on this day 0.01 million km2, 0.00 million k m2 more than the average gain on this day (of the last 10 years) of 0.01 million km2,
- Cumulative Melt on this date is 32.65 million km2, which is 9.46 million km2, 40.8% more than the 10 year average of 23.18 million km2.

- Cumulative Melt is at position #3 in the satellite record

- Melt is  9.71 million km2 MORE than 2020,
- Melt is  4.64 million km2 MORE than  2019,
- Melt is  0.16 million km2 LESS than 2010
- Melt is  13.86 million km2 LESS than 2012
- Melt is  1.43 million km2 MORE than 2016
- Melt is  5.37 million km2 MORE than the 2010's Average
_____________________________________________
On average 98.1% of Melt gains done, and 53 days to end of data collection.

Projections. (TableMaxProjection)

Average remaining Melt gain (of the last 10 years) would produce a maximum melt of 29.37 million km2, 18.04 million km2 below the Sept 2012 record high maximum of 47.41 million km2 and at position #3 in the 45 year data record.
_______________________________________________________________
N.B. Click on image 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 #205 on: September 09, 2023, 10:16:55 PM »
Greenland Ice Sheet Mass Loss
NASA / JPL have updated Antarctic Ice Sheet Mass Gains & Losses, latest is to mid June 2023.

From mid-May to mid-June SMB gains exceeded mass loss from melting of ocean-terminating glaciers and basal melt by 28 GT.
"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 #206 on: September 10, 2023, 08:58:44 PM »
DMI data as at 9 September from http://polarportal.dk/en/greenland/surface-conditions/ & https://ensemblesrt3.dmi.dk/data/prudence/temp/PLA/PP_GSMB/

Accumulated SMB
gain at 31GT is 16 GT (110%) above the 2017-2022 average of 15 GT.

DMI uses the calendar year for melt data.
Daily melt down to 2%, which is below the longterm average for the time of year.

Accumulated melt at 34.31 100% days equivalent, 19% above the total melt average 2017-22

The weather outlook for the next few days looks like being cool with not much melt and dryish Greenland.

It is certain that accumulated melt this year will finish at 3rd and maybe even 2nd highest in the satellite record (from NSIDC Greenland Today data). 2012 will still be by far the year of the record accumulated melt and lowest annual SMB gain.
"Para a Causa do Povo a Luta Continua!"
"And that's all I'm going to say about that". Forrest Gump
"Damn, I wanted to see what happened next" (Epitaph)

gerontocrat

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Re: Greenland 2022-23 SMB, melting and GRACE mass
« Reply #207 on: September 17, 2023, 05:40:51 PM »
DMI data as at 16 September from http://polarportal.dk/en/greenland/surface-conditions/ & https://ensemblesrt3.dmi.dk/data/prudence/temp/PLA/PP_GSMB/
[/b]

DMI measures SMB using the year 1 Sept to 31 Aug.
Accumulated SMB gain at 42GT is 9 GT (28%) above the 2017-2022 average of 33 GT.

DMI uses the calendar year for melt data.
Daily melt averageing about 2% in the last week, which is below the longterm average for the time of year.

Accumulated melt at 34.45 100% days equivalent, 19.6% above the total melt average 2017-22 of 28.80 days.

The weather outlook for the next few days looks like being cool with not much melt and a dryish Greenland.

It is certain that accumulated melt this year will finish at 3rd and maybe even 2nd highest in the satellite record (from NSIDC Greenland Today data).
"Para a Causa do Povo a Luta Continua!"
"And that's all I'm going to say about that". Forrest Gump
"Damn, I wanted to see what happened next" (Epitaph)

oren

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Re: Greenland 2022-23 SMB, melting and GRACE mass
« Reply #208 on: September 20, 2023, 02:29:59 PM »
Turns out summer 2023 broke temp records by a large margin in Greenland Summit. More details at https://forum.arctic-sea-ice.net/index.php/topic,1090.msg382506.html#msg382506

gerontocrat

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Re: Greenland 2022-23 SMB, melting and GRACE mass
« Reply #209 on: September 23, 2023, 07:33:32 PM »
DMI data as at 22 September from http://polarportal.dk/en/greenland/surface-conditions/ & https://ensemblesrt3.dmi.dk/data/prudence/temp/PLA/PP_GSMB/
[/b]

DMI measures SMB using the year 1 Sept to 31 Aug.
Accumulated SMB gain at 44GT is 2 GT (4%) above the 2017-2022 average of 42 GT.

DMI uses the calendar year for melt data.
Daily melt averaging below 2% in the last week, which is well below the longterm average for the time of year.

Accumulated melt at 34.49 100% days equivalent, 19.7% above the total melt average 2017-22 of 28.80 days.

The weather outlook for the next few days looks like being more cool than warm with not much melt and a maybe a dryish Greenland.

It is certain that accumulated melt this year will finish at 3rd and less likely to end 2nd highest in the satellite record unless a major pulse of warmth reaches Greenland (from NSIDC Greenland Today data).
"Para a Causa do Povo a Luta Continua!"
"And that's all I'm going to say about that". Forrest Gump
"Damn, I wanted to see what happened next" (Epitaph)

gerontocrat

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Re: Greenland 2022-23 SMB, melting and GRACE mass
« Reply #210 on: October 02, 2023, 02:00:02 PM »
DMI data as at 1 October from http://polarportal.dk/en/greenland/surface-conditions/ & https://ensemblesrt3.dmi.dk/data/prudence/temp/PLA/PP_GSMB/
[/b]

DMI measures SMB using the year 1 Sept to 31 Aug.
Accumulated SMB gain at 53GT is 10 GT (15%) above the 2017-2022 average of 63 GT.

DMI uses the calendar year for melt data.
Daily melt close to zero in the last week.

Accumulated melt at 34.49 100% days equivalent, 19.7% above the total melt average 2017-22 of 28.80 days.

It is certain that accumulated melt this year will finish at 3rd and less likely to end 2nd highest in the satellite record unless a major pulse of warmth reaches Greenland (from NSIDC Greenland Today data).
"Para a Causa do Povo a Luta Continua!"
"And that's all I'm going to say about that". Forrest Gump
"Damn, I wanted to see what happened next" (Epitaph)

gerontocrat

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Re: Greenland 2022-23 SMB, melting and GRACE mass
« Reply #211 on: October 13, 2023, 03:35:28 PM »
Greenland Ice Sheet (GIS) Mass Loss

At last GFZ have updated their GIS Mass Loss data from GRACE-FO after a long, long time. (They have no funding tp produce this data).

It is only to March 3023 - but that is better than September 2022, and once again we now have data by drainage basins (see map).

GIS Mass Loss has basically stalled for some time which seems to correspond woth thge La Nina timeframe. Coincidence?
"Para a Causa do Povo a Luta Continua!"
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kassy

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Re: Greenland 2022-23 SMB, melting and GRACE mass
« Reply #212 on: October 13, 2023, 03:40:58 PM »
It is only to March 3023

That is pretty impressive.  ;)
Þetta minnismerki er til vitnis um að við vitum hvað er að gerast og hvað þarf að gera. Aðeins þú veist hvort við gerðum eitthvað.

gerontocrat

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Re: Greenland 2022-23 SMB, melting and GRACE mass
« Reply #213 on: October 15, 2023, 08:23:17 PM »
DMI data as at 14 October from http://polarportal.dk/en/greenland/surface-conditions/ & https://ensemblesrt3.dmi.dk/data/prudence/temp/PLA/PP_GSMB/
[/b]

DMI measures SMB using the year 1 Sept to 31 Aug.
Accumulated SMB gain (2023-2024) at 87GT is 4 GT (4%) below the 2017-2022 average of 91 GT.

DMI uses the calendar year for melt data.
Daily melt close to zero in the last week.

Accumulated melt at 34.55 100% days equivalent, 20.0% above the total melt average 2017-22 of 28.80 days.
"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 #214 on: October 15, 2023, 08:27:17 PM »
GIS (& AIS) mass loss data

I've had an email from GFZ in Germany to say they have secured funding for extra processing resources for all their GRACE-FO projects. So over time we may see some more up-to-date Ice Sheet Mass Loss data.
"Para a Causa do Povo a Luta Continua!"
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Richard Rathbone

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Re: Greenland 2022-23 SMB, melting and GRACE mass
« Reply #215 on: October 23, 2023, 08:50:12 AM »
Season round up post by a couple of DMI authors at carbonbrief

https://www.carbonbrief.org/guest-post-how-the-greenland-ice-sheet-fared-in-2023/

Quote
The most remarkable feature in the evolution of the SMB in 2023 was the extended period of growth in June. At the end of that month, the accumulated SMB was almost 150Gt above average.

The effect of this extra snow meant that the onset of the melt – or “ablation” season was on 29 June – 16 days later than the 1981-2022 median. The ablation season is defined as the first day of three days in a row with an SMB below -1Gt.

As in previous summer seasons, the reason for the comparatively wet and cool spells over the Greenland ice sheet can be found quite far away from Greenland in “blocking” weather patterns.

Quote
The station at the summit of Greenland – about 3,000 metres above sea level – recorded a new average temperature record of -7.3C, almost 2C warmer than the previous record of -9.2C set in 2012 and 4C warmer than the long-term average at summit station.

Quote
For the past year, the TMB clocked in at a loss of 196Gt of ice. This means that 2022-23 was the 27th year in a row where the Greenland ice sheet has lost mass overall. As the chart shows, Greenland last saw an annual net gain of ice in 1996.

Quote
The two approaches to calculating TMB have a common period of 1 April 2002 to 31 March 2023. These estimates suggest that the Greenland ice sheet lost around 4,578Gt (Mankoff et al.) to 4,745Gt (GRACE) of ice over this time. Note that the two methods are completely independent.

The result from both datasets is equivalent to around 13mm of global average sea level rise.

gerontocrat

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Re: Greenland 2022-23 SMB, melting and GRACE mass
« Reply #216 on: November 05, 2023, 10:21:51 AM »
Time to finish this thread as it is now the 2023-24 season as far as DMI is concerned, and NSIDC's melt data stops at 31 October.

So here are NSIDC's melt graphs & tables in KM2, & DMI's melt graph in % of GIS area melt.

2023 saw the 3rd highest accumulated melt in the 1979 to 2023 satellite record.

The DMI data graph shows how short the melting season is.
"Para a Causa do Povo a Luta Continua!"
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oren

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Re: Greenland 2022-23 SMB, melting and GRACE mass
« Reply #217 on: November 08, 2023, 03:02:14 PM »
Thanks for all the updates. Onwards to a new SMB year.