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Peter T Fretwell

@ptfretwell.bsky.social
401 followers 59 following 151 posts

Scientist at British Antarctic Survey, Cambridge and author. Interest include Science, nature, cartography, Polar regions and satellite imagery/ remote sensing.

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Peter T Fretwell @ptfretwell.bsky.social · 26/09/2026
Currently (26 Sept 2026) there are four hurricane class storms in the equatorial Pacific at the same time. Is this unprecedented?
Live Hurricane Tracker | NESDIS | National Environmental Satellite, Data, and Information Service https://share.google/JSwrejw6ZgeyRLXSi
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Peter T Fretwell @ptfretwell.bsky.social · 23/09/2026
Latest paper now out www.frontiersin.org/journals/mar...
frontiersin.org
Frontiers | An updated census of southern elephant seals Mirounga leonina at South Georgia using satellite imagery
Historically, South Georgia supported the largest breeding population of southern elephant seals Mirounga leonina globally. Yet since 1995, this population h...
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Communications Biology @commsbio.nature.com · 21/09/2026
Satellite observations reveal five newly identified emperor penguin colony sites suggesting that colonies are dynamic relocating over long distances in response to changing ice conditions @ptfretwell.bsky.social @bas.ac.uk www.nature.com/articles/s42...
nature.com
Dynamic emperor penguin colonies - Communications Biology
Satellite observations reveal five newly identified emperor penguin colony sites, suggesting that colonies are dynamic, relocating over long distances in response to changing ice conditions and reshap...
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Peter T Fretwell @ptfretwell.bsky.social · 18/09/2026
Emperor penguins are moving to avoid climate change. New paper now out: www.nature.com/articles/s42...
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Peter T Fretwell @ptfretwell.bsky.social · 18/09/2026
Emperor penguins are moving home to avoid climate change. New paper now out: www.nature.com/articles/s42...
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British Antarctic Survey 🐧 @bas.ac.uk · 17/09/2026
Hundreds of whales strand on a remote beach – and no one notices for months. Strandings can be an early warning system for ocean health, flagging pollution, disease, and environmental change. But in remote areas, they often go unseen. 🐳 🧵1/2
A diagram showing satellite images of whale strandings on a beach.
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Peter T Fretwell @ptfretwell.bsky.social · 05/09/2026
www.solcreativefoundry.com/wild-world-a...
solcreativefoundry.com
Wild World: Antarctica Talk & Family Day | Sol Creative Foundry
A family day of Antarctic science, craft and storytelling in Dry Drayton, Cambridge, with a talk from British Antarctic Survey scientist Dr Peter Fretwell. 13 September.
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Peter T Fretwell @ptfretwell.bsky.social · 02/09/2026
Out today in paperback!
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Peter T Fretwell @ptfretwell.bsky.social · 02/09/2026
www.durham.ac.uk/news-events/...
durham.ac.uk
Tracking emperor penguins from space - Durham University
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Peter T Fretwell @ptfretwell.bsky.social · 27/08/2026
NASA piece on our emperor penguin work: science.nasa.gov/earth/earth-...
science.nasa.gov
A Changing World for Emperor Penguins - NASA Science
Experts are analyzing decades of images from Landsat satellites for clues about how the iconic birds have responded to sea ice disruptions in the past.
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Peter T Fretwell @ptfretwell.bsky.social · 20/08/2026
This is one of my favourite maps in my collection. The ill judged FIDS 1:200k series maps of Antarctica., which tried to map the whole of British Antarctic Territory. Like many of the maps in this series, although it covers 18,000 km2, there is virtually nothing on it.
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Lisa Fretwell @lisaefretwell.bsky.social · 16/07/2026
I'm starting a new Drawing class in Cottenham as of Sept 8 2026 If you are interested, please just let me know! Bookings are going fast.
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Gale Sinatra @galesinatra.bsky.social · 27/06/2026
I think we just passed oops.
A timeline of climate change concern.
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Peter T Fretwell @ptfretwell.bsky.social · 13/06/2026
Article in the Guardian I'm quoted in highlighting the continued decline of sea ice in West Antarctica, and some of the consequences.
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Gregory Andrews @lyrebirddream.bsky.social · 10/06/2026
Climate change isn’t waiting for us to finish with culture wars. Antarctica proves that every day.👇🏽 www.lyrebirddreaming.com/post/while-w...
lyrebirddreaming.com
While We Look Away, Antarctica is Melting
If you want a metaphor for our times, you could hardly do better than Antarctica in June 2026. While Pauline Hanson argues about migration and pronouns flags, and everyone gets whipped up into culture...
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Peter T Fretwell @ptfretwell.bsky.social · 11/06/2026
It's the middle of winter in Antarctica and temperatures have risen to +15 degrees C in some spots. Rain is melting the glaciers when snow should be replenishing them. Signs of accelerating change.
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Dr Michelle LaRue @drmichellelarue.bsky.social · 02/06/2026
We can track emperor penguins’ behavior… in the dark! During winter! When it’s just the males incubating eggs! This new tech gives us a leg up in understanding this iconic species 🌎🧪🦉🦑 Press release here: www.canterbury.ac.nz/news-and-eve...
Group of emperor penguins on the ice; photo taken under NZ permits to LaRue from a safe distance.
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Dr Michelle LaRue @drmichellelarue.bsky.social · 26/05/2026
Here's one for you: our paper has been sent to three journals over the course of nine months... without a full review. The first journal found ONE person. The last journal tried 15 times and no dice. What on earth. Anyone want to read a paper about emperor penguins? 🦉🦑🌍🧪
Emperor penguin close up
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Peter T Fretwell @ptfretwell.bsky.social · 22/05/2026
www.abc.net.au/news/2026-05...
abc.net.au
China and Russia block conservation bid for endangered emperor penguin
The annual meeting of Antarctic Treaty nations has failed to reach consensus to designate the endangered emperor penguin as a "Specially Protected Species".
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Peter T Fretwell @ptfretwell.bsky.social · 26/04/2026
Shrinking Sea Ice Is Ruffling Emperor Penguins’ Feathers eos.org/articles/shr...
eos.org
Shrinking Sea Ice Is Ruffling Emperor Penguins’ Feathers - Eos
A scientist stumbled upon evidence of penguin molting sites in satellite data, but the sea ice these birds rely on is disappearing.
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Hannah Cubaynes @whalesfromspace.bsky.social · 19/03/2026
Looking for walrus detectives! 🕵️‍♀️
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Center for Biological Diversity @biologicaldiversity.org · 09/04/2026
Emperor penguins were just declared endangered by IUCN. In the face of climate change, these beloved penguins have been losing the sea ice they need to survive. This is another urgent warning that the world needs to end our reliance on fossil fuels.
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Polar Prem 🦭(Prem Gill) @polarprem.bsky.social · 07/04/2026
Passed my viva and (pending minor corrections) am a “Dr of Seals”! Thanks to my supervisors @ptfretwell.bsky.social and Gareth Rees for guiding me to this stage. #academia #phd #cambridge @bas.ac.uk @scottpolar.bsky.social @ukri.org @wwf.org.uk
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Dominic Manchee @dpmanchee.bsky.social · 01/04/2026
Link link.dataspace.copernicus.eu/gn5j and lake in close up
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Peter T Fretwell @ptfretwell.bsky.social · 31/03/2026
@bsky.app This weeks Antarctic discovery: The largest lake on the Antarctic Peninsula. Unnamed, as it only deglaciated over the last decade. It's on a place called View Point on the Eastern side of the Peninsula. There are other larger lakes in the region, but this is the largest on the mainland.
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Point Blue Conservation Science @pointblue.bsky.social · 26/03/2026
🐧❄️🧪🌏🦑🦉 New publication! Led by @rosetazetta.bsky.social, we used satellite imagery to study Ross Sea #emperorpenguin populations over 20+ years & found that spring colony attendance is closely linked to sea ice conditions. Learn more: shorturl.at/joLZA
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Eos @eos.org · 24/03/2026
In new research, @ptfretwell.bsky.social @bas.ac.uk discovered emperor #penguin molting sites in satellite images—sites threatened by the disappearance of sea ice. 🐧🧊🧪 Comments from @drmichellelarue.bsky.social at Univ. of Canterbury; story by @andrewchapman.bsky.social. eos.org/articles/shr...
eos.org
Shrinking Sea Ice Is Ruffling Emperor Penguins’ Feathers - Eos
A scientist stumbled upon evidence of penguin molting sites in satellite data, but the sea ice these birds rely on is disappearing.
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Dr Michelle LaRue @drmichellelarue.bsky.social · 21/03/2026
🦑🦉🧪🌎
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British Antarctic Survey 🐧 @bas.ac.uk · 20/03/2026
Hello Walrus-spotters of Bluesky! Meet Dr Hannah Cubaynes, who is leading the Walrus from Space citizen science counting project. Help count here ➡️ geohive.vantor.com/walrus/login Watch Hannah's talk about her (prize-winning) work tracking animals with satellites 👇 www.youtube.com/watch?v=99YS...
youtube.com
Whales & walrus from space | Dr Hannah Cubaynes Law Prize Lecture | British Antarctic Survey
YouTube video by British Antarctic Survey
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Peter T Fretwell @ptfretwell.bsky.social · 18/03/2026
If your in London tomorrow come along to the Shackleton Store to hear about "Penguins in Peril" and the Penguin Book of Penguins at a free event.https://shackleton.com/pages/events
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British Antarctic Survey 🐧 @bas.ac.uk · 18/03/2026
Bluesky, we need your help to count walrus! 🦭 Previously on "Walrus from Space", volunteers like you sifted through around 500,000 satellite images to support our conservation research. Now we're asking the you to help us count the walrus in those images 👀 ➡️ geohive.vantor.com/walrus/login
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Peter T Fretwell @ptfretwell.bsky.social · 16/03/2026
I can announce that my Antarctic Atlas will be re-issued in paperback in September. I am just in the process of reviewing a retrospective work on the first ever Atlas of Antarctica published by the USSR 60 years ago. It took 10 years and 265 scientists, cartographers and reviewers to compile it!
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Heard Island Government @heardislandgov.bsky.social · 13/03/2026
Life imitates Art
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aretsch.bsky.social @aretsch.bsky.social · 11/03/2026
🇦🇶Antarctica 👍👏🏻 Rather too small for official names; but now maybe "Fretwell Islands"👍 📸🛰 #Sentinel2 2016 - 2026 @ptfretwell.bsky.social link.dataspace.copernicus.eu/5lc8
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Peter T Fretwell @ptfretwell.bsky.social · 11/03/2026
You might think that we have the world pretty well mapped. But Antarctica we are still finding new islands. Here are the locations of five islands and a larger island groups I discovered last week!
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World Meteorological Organization @wmo-global.bsky.social · 03/03/2026
Scientists have discovered that the shrinking sea ice in the Antarctic force penguins to crowd into smaller patches of stable ice to moult. On #WorldWildlifeDay, explore how researchers from @bas.ac.uk are studying this phenomenon using satellites imagery: bit.ly/40K4iQI
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András Zlinszky @azlinszky.bsky.social · 02/03/2026
Check compare visualization here: link.dataspace.copernicus.eu/w2h6 (Antarctica is covered by Extra-Wide Swath data, you have to choose HH+VV polarization in the Browser, and use HH Decibel Gamma to see ice and open water)
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Peter T Fretwell @ptfretwell.bsky.social · 02/03/2026
The ice shelf connecting Rothschild Island to Alexander Island has disintegrated. 100 km2 of shelf, a remnant from the Wilkins Ice shelf, broke up on the 1st March, making an 11km wide channel between the two islands. Images from Sentiel-1
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British Antarctic Survey 🐧 @bas.ac.uk · 25/02/2026
Here's the full story on our website: www.bas.ac.uk/news/acciden... And here's the paper in Communications Earth & Environment: www.nature.com/articles/s43...
bas.ac.uk
Accidental discovery reveals grim future for emperor penguins - British Antarctic Survey
Scientists studying satellite images of Antarctica have stumbled upon a discovery that sheds new light on moulting emperor penguins – and reveals a troubling threat to their survival.
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Peter T Fretwell @ptfretwell.bsky.social · 25/02/2026
Our latest paper is now out, and it's not good news www.bbc.co.uk/news/article...
bbc.co.uk
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.
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Daniel Cressey @dpcressey.bsky.social · 17/02/2026
Love this paper title: A roadmap towards monitoring walruses from space academic.oup.com/icesjms/arti... From @bas.ac.uk / @ptfretwell.bsky.social / and others
academic.oup.com
A roadmap towards monitoring walruses from space
Abstract. Walruses (Odobenus rosmarus) are experiencing rapid habitat change, concomitant with dramatic sea ice declines in the Arctic. Reduction in sea ic
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Heard Island Government @heardislandgov.bsky.social · 13/02/2026
Two can play this game of Canadian Palantir eh. “We shall track on the beaches, we shall track on the landing grounds, we shall track you in the fields and in the streets, we shall track in the hills; we shall never surrender.”
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Peter T Fretwell @ptfretwell.bsky.social · 09/02/2026
Nice phytoplankton booms in Marguerite Bay Antarctica
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aretsch.bsky.social @aretsch.bsky.social · 02/02/2026
What's going on with the Penguin 🐧 chicks 🐥 ?? Click to enlarge ↕️↔️ 📸🛰 #Sentinel2 Footage: @sentinelonline.bsky.social @ptfretwell.bsky.social Link.dataspace.copernicus.eu/r753
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Grant Macdonald❄️ @geogeordie.bsky.social · 27/01/2026
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).
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Zack Labe @zacklabe.com · 23/01/2026
Friday ice update - #Arctic sea ice extent is currently the *lowest* on record (JAXA data)... • about 500,000 km² below the 2010s mean • about 1,090,000 km² below the 2000s mean • about 1,640,000 km² below the 1990s mean • about 2,110,000 km² below the 1980s mean More: zacklabe.com/arctic-sea-i...
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.
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Peter T Fretwell @ptfretwell.bsky.social · 23/01/2026
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.
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Grant Macdonald❄️ @geogeordie.bsky.social · 21/01/2026
Our first paper from the 'EPIC' project- 'How will Emperor Penguins Respond to Changing Ice Conditions?'🐧❄️ - is now out. 🎉 My first first-author penguin paper🐧! w co-authors @changingice.bsky.social, Chris Stokes, Melanie Marochov, @ptfretwell.bsky.social, Stéphanie Jenouvrier tinyurl.com/4635pdwh
cambridge.org
Response of emperor penguins to 40 years of changing ice conditions at the Astrid, Mertz and SANAE colonies using satellite remote sensing (1984–2024) | 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 (1984–2024)
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Peter T Fretwell @ptfretwell.bsky.social · 19/01/2026
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.
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Peter T Fretwell @ptfretwell.bsky.social · 16/01/2026
There's a lot of chat about the new subglacial map of Antarctica on the BBC that was generated using inverse modelling. Spot the difference:
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