Signe Aaboe

Giant sun flower

Happy (Giant) Sun Flower 🌻🌱
Born in 13 degrees and rain. Grew through heat periods. Survived droughts, and stood straight through heavy winds.
I’m so impressed 😍

Nothing every changes but the climate When I became a climate scientist nearly 22 years ago, I started accumulating books on the subject. One of the first was called something1 like “Global Warming: Apocalypse or Hot Air?” …

Nothing ever changes but the climate

Some initial notes on the DOE Critical Review of Impact of Greenhouse Gas Emissions on the US Climate

And a 🧵 of other responses I'm aware of (let me know if you know of others)

diagrammonkey.wordpress.com/2025/08/01/n...

1/n

These assholes often back down when we push back.

We should push back more.

Piles of white coulds reaching into the sky from the sea

A bloom of cloud over the Rosnæs peninsula

The wake of a ferry with a cloudscape overhead

Some bon-Danish colleagues yesterday were talking about how strange it is on Denmark that you can always see he horizon, there are no mountains in the background really. That's definitely only partly true, but on the other hand we have incredible clouds.

#Cloudscapes

Great to see 😀

#Antarctic #SeaIce July 2025. One interesting feature is the huge iceberg A23a returning south at about 30 W.

Map showing the Antarctic anomaly of the July 2025 sea-ice concentration relative to the mean July ice concentration in 1981-2010. Especially, the sea ice around the Antarctic Peninsula, and in the King Haakon VII sea, shows large areas of negative anomaly (red colour). Source data is OSI SAF sea-ice concentration CDR v3.0.

The line graph displays the monthly sea-ice extent in the Antarctic for July from 1979 to 2025. In 2025, the July extent ranked as the third lowest on record. Source data is OSI SAF sea-ice index.

Disregarding the extreme and record-low sea-ice extent in Antarctic the last two years, this year's July extent is exceptionally low, ranking as the 3rd lowest on record.

The July extent over the last four years differs significantly from that of the previous four decades.

@osi-saf.eumetsat.int

New status on OSISAF Sea Ice Index.
With the continuation of SSMIS data distribution, the sea-ice index v2.2 (based on SSMIS) will continue as usual.

The newly implemented branch providing a calibrated AMSR-based index will be monitored and work as a backup.

👉 osi-saf.eumetsat.int/community/li...

Graph showing the Arctic Sea Ice Extent daily value for each year since 1978 (each year is represented with a curve of a different color)

Graph showing the Antarctic Sea Ice Extent daily value for each year since 1978 (each year is represented with a curve of a different color)

In July 2025, the #SeaIce global extent was 8.9% below 1991-2020 mean. Since the beginning of records (1978):
- #Arctic, 4th lowest monthly mean, with 9.9% less extent (-906.931 km²)
- #Antarctic, 3rd lowest monthly mean, 8.3% less exent (-1.363.243 km²)
For more: osisaf-hl.met.no/v2p2-sea-ice...

Note - that the decommission of the DMSP (SSMIS) has been postponed ...
And SSMIS data will be provided on a "best effort" basis.

Stay updated on product implications here 👉 osi-saf.eumetsat.int/community/st...

@osi-saf.eumetsat.int

DOE climate report response form We are collecting names to assemble a writing team to respond to the DOE climate working group report. If you'd like to contribute, enter your info below. At this point, there is no guarantee what we'll do (if anything), but we want to keep our options open by collecting names. If you have any further questions, feel free to email me. We are primarily looking for Ph.D. scientists at universities or government labs in appropriate fields. I realize that this will exclude some qualified people and I apologize, but we felt this was necessary for a variety of reasons.

🚨 If you're interested in working on a coordinated response to the DOE climate report, please enter your info on this google form 🚨

Please RT this so as many people see it as possible.

forms.gle/BL9xUAfRxA...

Forecast 2-m temperatures today in Finland, based on the MEPS regional model.

20 straight days with 30 °C in Finland! Truly unprecedented heatwave still in full swing with maximum today about 32-33 degrees.

Even the Arctic regions (e.g. Sodankylä Tähtelä) have seen three weeks above 25 °C, and may rival tomorrow their August heat records.

Impact of the loss of SSMIS data on the OSI SAF Sea Ice Index | OSI SAF As previously announced, U.S. SSMIS data will no longer be available after July 31st, 2025. This service message describes the impact on our Sea Ice Index (OSI-420, https://osi-saf.eumetsat.int/products/osi-420).

For more details, please see our service message here: osi-saf.eumetsat.int/community/li...

Line graph showing sea-ice extent in 2025 for the Northern Hemisphere. In blue is the original sea-ice index (SII) v2.2, which is based on SSMIS. In orange is the similar SII based on AMSR-2 instead. And in red is the calibrated AMSR-based SII, which will be used to extend the SII from August 2025. Source: OSI SAF Sea-index (OSI-420)

How do we at @osi-saf.eumetsat.int prepare the Sea-Ice Index for the potential End-of-Life of SSMIS after July?

1. Compute indexes from AMSR-2 instead
2. Develop a calibration tuned over 2021-2025
3. Continue the index time series with calibrated AMSR-based indexes from August 2025.

👉 (link below)

📣 Note - Are you using sea-ice concentration climate data from OSI SAF,

please be aware

that an AMSR-2-based product is now being released

to replace the SSMIS-based product (soon end-of-life) 👉

A world with less ice Global impacts of Antarctic summer sea-ice extremes

the animation is part of this
aapp.shorthandstories.com/a-world-with...

YouTube video by Australian Antarctic Program Partnership Sea ice is a global climate driver

Amazing animation of satellite data showing the seasonal cycle of sea-ice extent around Antarctica and in the Arctic, along with global sea surface temperature, over five years from 2020 to 2025

www.youtube.com/watch?v=RYDf...

I meant on Sunday…

Screendump from yr.no showing weather forecast on July 27th and the time for that day’s sun rise and two sunsets.

I’m gonna enjoy a couple of sunsets on Thursday 😜

(Had to think for a second to understand 😅)

Two landscape photos of the same view towards the north, showing a steep mountain, a small abandoned village, and the sea. Photos are taken at 8PM and 11.30PM, respectively.

Somewhere in the North
and the never-setting-sun ☀️

Same view before and after a beautiful evening paddle on a mirror-like ocean 🛶

Red line graph time series of monthly carbon dioxide abundance from January 1959 through June 2025. There is a seasonal cycle and long-term increasing trend. Current levels of CO2 are at 430 ppm. This is the Keeling Curve graph. A line for CO2 10 years ago is also annotated.

Carbon dioxide (CO₂) averaged about 430 ppm in June 2025

10 years ago June averaged about 403 ppm

Preliminary data from @noaa.gov: gml.noaa.gov/ccgg/trends/

SAGE Daybinar "Beyond Sea Ice Area: Exploring Alternative Diagnostics for Assessing Polar Climate Change" The Sea Ice Age and Drift (SAGE) Project, funded by the European Space Agency (ESA) Climate Change Initiative (CCI) is organizing a multi-time zone, one-day webinar (daybinar) on Friday September 19, ...

forms.gle/Ure5JxiGUZsY...

The webinar is organized by the ESA-funded project "Sea Ice Age and Drift" (SAGE).
The SAGE team consists of leading experts in the field:
@polarbremen.bsky.social
@umanitoba.bsky.social
@nansensenteret.bsky.social
@uni-hamburg.de
#UCLouvain
#S&T
and
@met.no

The Sea Ice Age and Drift (SAGE) Project, funded by the European Space Agency @esa.int Climate Change Initiative (CCI) is organizing a multi-time zone, one-day webinar (daybinar) on Friday September 19, 09:00-20:00 CEST.

Photo showing ice floes in the Arctic. Photo by Olaf Schneider, Norwegian Polar Institute, Norway.

📣 Join our Webinar "Beyond Sea Ice Area" on September 19th.

Sea Ice Age is the focus🔎

Main topics:
1. Review ECV sea ice products
2. Refine sea ice age product
3. Explore polar data issues

For more information and registration, 👉https://forms.gle/Ure5JxiGUZsYyjuf9
Please repost and share

#ESA

Meet us at the UK Space Conference in Manchester on 16-17 July and visit our interactive globe! Discover how the Climate Change Initiative captures Essential Climate Variables & how missions like EarthCARE and Biomass contribute to global climate monitoring🌍 #UKSC2025

NASA Website Will Not Provide Previous National Climate Reports

Today NASA backtracked on its statement earlier this month that the National Climate Assessments would be hosted on their website.

“NASA has no legal obligations to host globalchange.gov’s data,” a spokeswoman said today. “We never did and will not host the data.”www.nytimes.com/2025/07/14/c...re

East Asian aerosol cleanup has likely contributed to the recent acceleration in global warming - Communications Earth & Environment Restrictions of atmospheric aerosol and precursor emissions in East Asia have contributed to the observed global surface warming acceleration since 2010, according to Earth System Model simulations is...

New article published today by my colleague @bjornsamset.bsky.social in Nature Comms: Earth and Environment. Evidence from eight Earth System Models that the reduction in East Asia's (primarily China's) air pollution is consistent with the sharper growth in warming.

Map of northern hemisphere centred on Greenland showing red for unusually warm.and blue for unusually cold. Arrows show average 10m wind speed and direction for period 8th to 12th July.

Makes a lot of sense when you look at the prevailing winds the last few weeks eh on @polarportal.bsky.social

polarportal-prod.dmi.dk/api/v1/serve...

A large polynya has developed northeast of Greenland.
This is clearly visible in the new AMSR-based sea-ice concentration product (OSI-438), but is less visible in the SSMIS-based product (OSI-430) due to its lower spatial resolution.
🧪🌊🥼❄️