Grant Macdonaldโ„๏ธ's Avatar

Grant Macdonaldโ„๏ธ

@geogeordie

Studying the poles - sea ice, ice shelves, and now emperor๐Ÿง, using ๐Ÿ›ฐ๏ธ & field workโ„๏ธ. Postdoc at Durham. Formerly of UChicago, UTSA, UVic.

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12.09.2024
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Latest posts by Grant Macdonaldโ„๏ธ @geogeordie

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Emperor Penguins must change their feathers - it may now be killing them The birds moult to protect themselves, but in a warming world, it could be endangering them.

Our latest paper is now out, and it's not good news www.bbc.co.uk/news/article...

25.02.2026 10:14 ๐Ÿ‘ 5 ๐Ÿ” 4 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 1
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Scientists reveal our best- and worst-case scenarios for a warming Antarctica - British Antarctic Survey New study on the Antarctic Peninsula shows that the choices we make in the next decade will determine Antarcticaโ€™s fate for centuries

The future of the Antarctic Peninsula depends upon the choices we make today.

www.bas.ac.uk/media-post/s...

20.02.2026 11:57 ๐Ÿ‘ 12 ๐Ÿ” 10 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
Polar Ocean Mixing by Internal Tsunamis

We are seeking a 3+ year postdoc in ocean modelling, to work on an exciting project investigating underwater tsunamis in Antarctica.

More about the project here: www.polomints.ac.uk
Read more about the post here: lnkd.in/eBjndZPv

Please share and help connect us with the best candidates!

11.02.2026 09:37 ๐Ÿ‘ 58 ๐Ÿ” 56 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
addison-wheeler-fellowship - Durham University

๐Ÿšจjob opportunity๐Ÿšจ

Durham is advertising 3-year fellowships (any field). We are very keen to hear from Antarctic/Cryo people who might be interested in joining a great group. The positions come with some travel & research funds. See here for details or get in touch www.durham.ac.uk/research/ins...

05.02.2026 12:08 ๐Ÿ‘ 3 ๐Ÿ” 8 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

Antarctic ice sheet folk, I'm looking for a Postdoctoral Fellow in Antarctic Ice Sheet Reconstruction [readvertised] for a 3.5yr appointment in Tasmania. Very flexible start date!

Join our new team, figuring out what is happening and what may happen in East Antarctica. 1/4
โ„๏ธ

06.02.2026 01:18 ๐Ÿ‘ 50 ๐Ÿ” 44 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 4
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Instagram Create an account or log in to Instagram - Share what you're into with the people who get you.

Penguin swimcam www.instagram.com/reel/DUUDvq6...

03.02.2026 23:24 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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Great to visit BAS yesterday to chat penguins and meet more of the wildlife from space community (what a cool name for a research theme).

27.01.2026 21:15 ๐Ÿ‘ 3 ๐Ÿ” 1 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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Penguin saviours needed in the Buenos Aires region ๐Ÿ‡ฆ๐Ÿ‡ท www.instagram.com/p/DUBttt5kmt...

27.01.2026 20:41 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
Details | Working at Bristol | University of Bristol

We're looking for a postdoctoral research associate to measure Greenland meltwater using Cryoeggs and seismometers. Join our dream team, apply here by 9 Feb: www.bristol.ac.uk/jobs/find/de...
Job ID ACAD108442
#glaciologyjobs

26.01.2026 17:02 ๐Ÿ‘ 9 ๐Ÿ” 13 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 1
Line graph time series of 2026's daily Arctic sea ice extent compared to decadal averages from the 1980s to the 2010s. The decadal averages are shown with different colored lines with purple for the 1980s, blue for the 1990s, green for the 2000s, and white for the 2010s. Thin white lines are also shown for each year from 2000 to 2025. 2026 is shown with a thick gold line. There is a long-term decreasing trend in ice extent for every day of the year shown on this graph between January and March by looking at the decadal average line positions.

Line graph time series of 2026's daily Arctic sea ice extent compared to decadal averages from the 1980s to the 2010s. The decadal averages are shown with different colored lines with purple for the 1980s, blue for the 1990s, green for the 2000s, and white for the 2010s. Thin white lines are also shown for each year from 2000 to 2025. 2026 is shown with a thick gold line. There is a long-term decreasing trend in ice extent for every day of the year shown on this graph between January and March by looking at the decadal average line positions.

Friday ice update - #Arctic sea ice extent is currently the *lowest* on record (JAXA data)...

โ€ข about 500,000 kmยฒ below the 2010s mean
โ€ข about 1,090,000 kmยฒ below the 2000s mean
โ€ข about 1,640,000 kmยฒ below the 1990s mean
โ€ข about 2,110,000 kmยฒ below the 1980s mean

More: zacklabe.com/arctic-sea-i...

23.01.2026 13:29 ๐Ÿ‘ 69 ๐Ÿ” 27 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 8

I would like to point out @jamesmlea.bsky.social 's GEEDiT tool really helped with this work!

23.01.2026 13:53 ๐Ÿ‘ 2 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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There are almost 300,000 data points in the IWC blue whale catch record, not one catch is recorded in the area of recent summer sea ice loss near the coast of West Antarctica. This shows that that Antarctic summer sea ice has not been as low as it is now for more than a century.

23.01.2026 09:42 ๐Ÿ‘ 6 ๐Ÿ” 1 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

I am very happy to announce that my first PhD paper has been published today at the Journal of Animal Ecology!!!

It is on how three penguin species have been shifting their breeding times in Antarctica and the sub-Antarctic in response to climate change. They are the fastest birds in doing so!

20.01.2026 19:59 ๐Ÿ‘ 24 ๐Ÿ” 9 ๐Ÿ’ฌ 2 ๐Ÿ“Œ 2
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Emperor Penguins in a Changing World: Unveiling Current Trends and Predicting Future Scenarios - Antarctic Environments Portal

Emp๐Ÿง continue to surprise us and we're doing more work to help us better understand how they will respond to their changing env.
We do know they face an uncertain future and current predictions make sad reading.But they also suggest reduced emissions can make a signif difference tinyurl.com/4ws6fk7u

21.01.2026 11:25 ๐Ÿ‘ 2 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
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Interestingly all three colonies were observed on the ice shelf in some years, and on icebergs in some instances. We observed two of the colonies on ice shelves over 20 years ago and when fast ice was stable.๐Ÿ•ต๏ธ It seems we may have underestimated how often these clumsy birds move up onto glacier ice.

21.01.2026 11:11 ๐Ÿ‘ 2 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

Early fast ice breakouts that likely impacted breeding were observed at two colonies. As early as Sep in 2016 at Mertz. But colonies returned to approx the same site in subsequent years.

Mertz early breakouts were since 2016, and also pre-2010 when tongue/colony extended further N before calving.

21.01.2026 11:11 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
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Major calving events at the Mertz and SANAE colonies caused colonies to relocate to different sites in the region. But in both cases they eventually returned to sites analogous* to their original.

(*they're situated next to moving ice shelves, so the colony's geographic location often 'drifts'!)

21.01.2026 11:03 ๐Ÿ‘ 2 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

In this study we delved into the archive of satellite imagery to look at 3 colonies over 4 decades. We wanted to know how they'd responded to key ice changes, such as major calving events and early fast ice breakout. So we can better understand how they'll respond to changing ice this century!
,

21.01.2026 11:01 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
Response of emperor penguins to 40 years of changing ice conditions at the Astrid, Mertz and SANAE colonies using satellite remote sensing (1984โ€“2024) | Antarctic Science | Cambridge Core Response of emperor penguins to 40 years of changing ice conditions at the Astrid, Mertz and SANAE colonies using satellite remote sensing (1984โ€“2024)

Our first paper from the 'EPIC' project- 'How will Emperor Penguins Respond to Changing Ice Conditions?'๐Ÿงโ„๏ธ - is now out. ๐ŸŽ‰

My first first-author penguin paper๐Ÿง! w co-authors @changingice.bsky.social, Chris Stokes, Melanie Marochov, @ptfretwell.bsky.social, Stรฉphanie Jenouvrier

tinyurl.com/4635pdwh

21.01.2026 10:58 ๐Ÿ‘ 13 ๐Ÿ” 7 ๐Ÿ’ฌ 2 ๐Ÿ“Œ 1
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For many years we have watched the Wilkins Ice shelf slowly break up. In 2009 it detached from Charcot Island to form Attenborough Strait. Yesterday, the last sliver joining it to Rothschild Island began to disintegrate. I'm waiting for tomorrow's image.

19.01.2026 18:08 ๐Ÿ‘ 8 ๐Ÿ” 4 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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East Antarctic โ€˜sea ice factoryโ€™ revealed as unexpected global current driver - AAPP A surprising source of deep-ocean ventilation in East Antarctica, with implications for global ocean currents and climate systems

1๏ธโƒฃ๐ŸŒŠ Coastal polynyas (semi-permanent areas of ice-free ocean) are known as โ€˜sea ice factoriesโ€™ because they produce vast amounts of new ice. This process drives the global current system which redistributes heat and #carbon around the world.

โ–ถ๏ธ aappartnership.org.au/east-antarct...

๐Ÿ“ธ @esa.int

14.01.2026 02:34 ๐Ÿ‘ 13 ๐Ÿ” 5 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 1
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Himalayan winters are seeing less snowfall as more ice melts Experts say dwindling snowfall during winter will impact the lives and livelihoods of millions.

www.bbc.com/news/article...

12.01.2026 11:55 ๐Ÿ‘ 4 ๐Ÿ” 1 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
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Research Associate in Mars Glaciology at University of Sheffield An academic position as a Research Associate in Mars Glaciology is being advertised on jobs.ac.uk. Click now to find more details and explore additional academic job opportunities.

I'm hiring!

3-year postdoc on an exciting new @royalsociety.org funded project on Martian glaciers @sheffielduni.bsky.social

Advert: tinyurl.com/6rzzk5d4

Terrestrial folks encouraged to apply (e.g. GIS, glacier modelling, geomorphology, or deep learning)

Closes 19th Jan. Queries via email.

05.01.2026 11:11 ๐Ÿ‘ 8 ๐Ÿ” 14 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 1
Line graph time series of 2026's daily Arctic sea ice extent compared to decadal averages from the 1980s to the 2010s. The decadal averages are shown with different colored lines with purple for the 1980s, blue for the 1990s, green for the 2000s, and white for the 2010s. Thin white lines are also shown for each year from 2000 to 2025. 2026 is shown with a thick gold line. There is a long-term decreasing trend in ice extent for every day of the year shown on this graph between January and March by looking at the decadal average line positions.

Line graph time series of 2026's daily Arctic sea ice extent compared to decadal averages from the 1980s to the 2010s. The decadal averages are shown with different colored lines with purple for the 1980s, blue for the 1990s, green for the 2000s, and white for the 2010s. Thin white lines are also shown for each year from 2000 to 2025. 2026 is shown with a thick gold line. There is a long-term decreasing trend in ice extent for every day of the year shown on this graph between January and March by looking at the decadal average line positions.

Monday ice update - #Arctic sea ice extent is currently the 2nd lowest on record (JAXA data)

โ€ข about 450,000 kmยฒ below the 2010s mean
โ€ข about 1,000,000 kmยฒ below the 2000s mean
โ€ข about 1,570,000 kmยฒ below the 1990s mean
โ€ข about 2,000,000 kmยฒ below the 1980s mean

More: zacklabe.com/arctic-sea-i...

05.01.2026 13:03 ๐Ÿ‘ 64 ๐Ÿ” 20 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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A picture is worth 1000 words...

This appeared on the BBC News today, showing the increase in solar electric generation in the UK.

Not sure who produced it, but genuinely think this is a genius piece of scientific communication - the construct and choice of colour scale is near-perfect.

Chapeau!

02.01.2026 16:53 ๐Ÿ‘ 584 ๐Ÿ” 203 ๐Ÿ’ฌ 14 ๐Ÿ“Œ 18
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Earthโ€™s frozen regions are sending a clear warning about climate change โ€“ but politicians are ignoring it The warning lights from the cryosphere have been flashing red for several years and governments and policymakers ignore this at their peril.

As scientists ๐Ÿงช who regularly attend UN #climate summits, we've noticed efforts to downplay, confuse and dilute the latest scientific findings, especially from the cryosphere โ„๏ธ.

This is alarming.

More details in @theconversation.com

theconversation.com/earths-froze...

@geogdurham.bsky.social

18.12.2025 11:44 ๐Ÿ‘ 20 ๐Ÿ” 12 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 5
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Pumas came back to Patagoniaโ€”and met penguins. What happened next surprised scientists. A natural experiment in a national park in Patagonia shows how the return of a large predator can reshape an ecosystem.

This isn't very christmassy.

www.nationalgeographic.com/animals/arti...

18.12.2025 03:45 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
Photo of a marine terminating glacier in Greenland with icebergs in front of it

Photo of a marine terminating glacier in Greenland with icebergs in front of it

๐ŸšจPOSTDOC JOB ALERT๐Ÿšจ

We have an exciting opportunity for a 2 year postdoc on remote sensing of icebergs and marine terminating glaciers. See the link below for more info!

Please spread widely, and feel free to email me with any Q's :)

tinyurl.com/2jjcmea9

17.12.2025 12:16 ๐Ÿ‘ 9 ๐Ÿ” 13 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

That's 4 for me now in wild (Adรฉlie, blue, yellow-eyed and Humboldt), 14 to go!

16.12.2025 19:20 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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15.12.2025 02:05 ๐Ÿ‘ 2 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0