Greenland 2023-24 SMB, melting and GRACE mass

[gerontocrat]

This thread is about the Surface Mass Balance change (i.e. snowfall) from 1 Sept 2023 to 31 Aug 2024, and Surface Melt April to October 2024,
plus DMI and JPL GIS Mass Loss data from GRACE /GRACE-FO data (whenever it is updated).
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2024 Melt Data

The melting season is over apart from occasional minor melt on odd days.
So here is a gif of daily melt 2024

click gif to start, runs 3 times, (each run around 50 seconds)

[HapHazard]

Awesome stuff, gero.

[gerontocrat]

2024 Melt Data to 31 October 2024

Although from now on there will be odd days when minimal melt occurs, melt is basically finished until March/April 2025.

The first two graphs attached show the comparison between melt recorded by NSIDC's "Greenland Today" and DMI. Greenland Today always shows less melt that DMI, but this year the difference is extreme, with DMI showing very high melt, and Greenland Today low melt.

As I have reported before, they both defend their algorithms so no explanation is forthcoming, which is a shame.

The 3rd graph shows DMI data in more detail including the 2018-22 average. DMI does not publish numerical melt data going back before 2018.

Greenland Today has data going back to 1979. The 4th Graph shows a summary of  that data, including decadal averages and the extraordinary 2012 year. Clearly melt is increasing as the years go by. However it seems that year round precipitation is also increasing, meaning SMB gains as yet are not decreasing. It is a pity we do not have access to SMB numerical data also going back to 1979 in a similar format to Greeland Today's melt data.

[gerontocrat]

JPL has released updated Greenland Mass Anomaly data - i.e. GIS mass change - to mid August 2024

A drop in July and August reflecting melt reducing SMB gain and glacial calving and melting of marine-terminating glaciers

[Bart Vreeken]

https://www.carbonbrief.org/guest-post-how-the-greenland-ice-sheet-fared-in-2024/

[Florifulgurator]

{JPL-Greenland Mass Loss from GRACE+GRACE-FO data.png}

Funny polynomial, with a completely different linear part. Is that Microsoft Excel math? (Beware the rounding error in line 32768 ) - But it shows a robustly linear melt. We are so lucky.

[gerontocrat]

{JPL-Greenland Mass Loss from GRACE+GRACE-FO data.png}

Funny polynomial, with a completely different linear part. Is that Microsoft Excel math? (Beware the rounding error in line 32768 ) - But it shows a robustly linear melt. We are so lucky.

The polynomial shows suggests a slight reduction in the rate of GIS mass loss. A recent paper suggests that a warmer wetter Greenland may lead in the short term to increased mass from from snowfall greater than current forecasts of mass loss from calving and melting of marine terminating glaciers and ice shelves.

But one year's data not enough to determine a trend

[Phil.]

{JPL-Greenland Mass Loss from GRACE+GRACE-FO data.png}

Funny polynomial, with a completely different linear part. Is that Microsoft Excel math? (Beware the rounding error in line 32768 ) - But it shows a robustly linear melt. We are so lucky.

The polynomial shows suggests a slight reduction in the rate of GIS mass loss. A recent paper suggests that a warmer wetter Greenland may lead in the short term to increased mass from from snowfall greater than current forecasts of mass loss from calving and melting of marine terminating glaciers and ice shelves.

But one year's data not enough to determine a trend

I suspect the the quadratic constant has been rounded to 0.00 but actually is non-zero, perhaps show it to 4 d.p.s?