Since a certain “sceptic” has recently been comparing 2024 sea ice extent to “20 years ago”, here’s the current JAXA/ViSHOP extent graph of selected years, including 2004:

The CryoSat-2/SMOS merged Arctic sea ice volume graph finishes on April 15th, but older data is being reanalysed and here is the latest version:

The gap in the near real time data due to the problem with the SMOS satellite during the first half of March has been filled in, but the result doesn’t look very convincing to say the least!

The PIOMAS gridded thickness data for April 2024 is now available. Here’s the end of month volume graph:

Maximum volume for 2024 was 22.88 thousand km³ on April 19th, which was 7th lowest in the 46 year satellite record.

Here too is the end of month thickness map:

It shows the ice thickening in the Chukchi Sea, with the Beaufort Sea continuing to look vulnerable to early melt. The last SMOS/SMAP thin ice thickness map of the spring reveals thin ice in the Amundsen Gulf and eastern Beaufort Sea, as well as on the Chukchi coast of Alaska:

The April Rutgers Global Snow Lab northern hemisphere snow cover chart has not yet been released, so here’s the Northern Hemisphere Multisensor Snow Extent graph instead:

[Update – May 9th]

The National Snow and Ice Data Center has published the April edition of their Arctic Sea Ice News:

The average Arctic sea ice extent for April 2024 was 14.12 million square kilometers, placing it sixteenth lowest in the passive microwave satellite record. As of the beginning of May, extent is well below average in the Sea of Okhotsk, and slightly below average in the Bering and Barents Seas and off the coast of Labrador. Ice is near the average position along the eastern coast of Greenland.

The global average temperature in April was at a record high in many assessments. By contrast in the Arctic, April 2024 temperatures at the 925 hPa level (about 2,500 feet above the surface) were below average by 3 to 5 degrees Celsius along the Siberian coast and northwestern coast of Scandinavia. Markedly warm conditions were the rule over most of Canada and northern Greenland. The regions near Hudson Bay and along Peary Land on the north coast of Greenland were 3 to 5 degrees Celsius above the 1991 to 2020 climate reference period.

The atmospheric pattern for April featured high sea level pressure centered over the Barents Sea but lower pressure over most of the rest of the Arctic Ocean. In Hudson Bay and Greenland, pressures were relatively high. The pattern in March that favored faster outflow of ice through Fram Strait did not persist into April.

The April Rutgers Global Snow Lab northern hemisphere snow cover anomaly chart reveals a record low area:

[Update – May 11th]

There is now significant open water in the eastern Beaufort Sea and Amundsen Gulf:

[Update – May 16th]

The first signs of surface melt are now apparent in the Coronation Gulf:

The sea ice in Hudson Bay is breaking up slightly earlier then usual:

[Update – May 18th]

The mid month PIOMAS gridded thickness data has been published, so here is the PIOMAS thickness map for May 15th 2024:

Here too is the mid month volume graph, now looking forward to the summer minimum:

Water is starting to appear on the fast ice off the Mackenzie Delta:

There is also now a clearer view of the surface melt on the sea ice in the Coronation Gulf:

As an extra special treat for our loyal reader(s), “Snow” and I got brassed of with YouTube’s refusal to let “us” post links to authoritative Arctic sources in comments. Hence “we” hastily produced this video:

Your feedback is most welcome, but note that it is already apparent that:

1) I evidently need a new microphone!

2) John Robson’s words and deeds seem to gradually get out of sync, but I haven’t got time to fix that at the moment.

[Update – May 30th]

I’ve been out on the road for a week, with no time to make my usual regular inspections of Worldview. On my return I note that, amongst other things, the Lena Delta has turned to liquid and much of the fast ice in the Laptev Sea is covered in melt ponds:

The conversation continues over on the June open thread.