Donovan Dennis
@donovanpdennis.com
Glaciologist, geochemist, writer 🏳️🌈🔥. Fan of cold hard facts gathered via equitable means. 🏔️ enthusiast. Formerly @gfz.bsky.social, now @pik-potsdam.bsky.social. Hier privat 😘.
📍Berlin
www.donovanpdennis.com
📍Berlin
www.donovanpdennis.com
You read the study in the Global Tipping Points Report, now join @iceybethan.bsky.social @ricarda-winkelmann.bsky.social, Judy Daxootsu Ramos and Annika Ord and me to discuss glacier loss and tipping points southeast Alaska at the #COP30 Cryosphere Pavilion next Monday.
@pik-potsdam.bsky.social
@pik-potsdam.bsky.social
November 14, 2025 at 9:46 AM
You read the study in the Global Tipping Points Report, now join @iceybethan.bsky.social @ricarda-winkelmann.bsky.social, Judy Daxootsu Ramos and Annika Ord and me to discuss glacier loss and tipping points southeast Alaska at the #COP30 Cryosphere Pavilion next Monday.
@pik-potsdam.bsky.social
@pik-potsdam.bsky.social
Floods from Suicide Basin in '23, '24, and '25 each set records for the largest on record. Following the 2024 flood, which damaged 300+ homes, new temporary barriers were installed to protect the community, at a cost to homeowners of $6000+ dollars.
As Áakʼw Tʼáak Sítʼ...
www.juneauflood.com#/home
As Áakʼw Tʼáak Sítʼ...
www.juneauflood.com#/home
October 13, 2025 at 11:23 AM
Floods from Suicide Basin in '23, '24, and '25 each set records for the largest on record. Following the 2024 flood, which damaged 300+ homes, new temporary barriers were installed to protect the community, at a cost to homeowners of $6000+ dollars.
As Áakʼw Tʼáak Sítʼ...
www.juneauflood.com#/home
As Áakʼw Tʼáak Sítʼ...
www.juneauflood.com#/home
But a MAJOR focus of the case study is not just on "how/why" Áakʼw Tʼáak Sítʼ may tip, but the consequences of it doing so.
Indigenous Tlingit communities have lived in and stewarded the coastal rainforests and waters of southeast Alaska and southwest Canada for at least the last 10,000 years...
Indigenous Tlingit communities have lived in and stewarded the coastal rainforests and waters of southeast Alaska and southwest Canada for at least the last 10,000 years...
October 13, 2025 at 11:23 AM
But a MAJOR focus of the case study is not just on "how/why" Áakʼw Tʼáak Sítʼ may tip, but the consequences of it doing so.
Indigenous Tlingit communities have lived in and stewarded the coastal rainforests and waters of southeast Alaska and southwest Canada for at least the last 10,000 years...
Indigenous Tlingit communities have lived in and stewarded the coastal rainforests and waters of southeast Alaska and southwest Canada for at least the last 10,000 years...
flow off this high plateau, they cross over a steep lip, where icefalls like this form. This is key for several of the feedbacks that may lead to tipping:
1️⃣: 'ELA' rise. When average temperatures warm 📈, it decreases the amount of snow which remains through the winter, raising a glacier's...
1️⃣: 'ELA' rise. When average temperatures warm 📈, it decreases the amount of snow which remains through the winter, raising a glacier's...
October 13, 2025 at 11:23 AM
flow off this high plateau, they cross over a steep lip, where icefalls like this form. This is key for several of the feedbacks that may lead to tipping:
1️⃣: 'ELA' rise. When average temperatures warm 📈, it decreases the amount of snow which remains through the winter, raising a glacier's...
1️⃣: 'ELA' rise. When average temperatures warm 📈, it decreases the amount of snow which remains through the winter, raising a glacier's...
In it, we've gone into quite a bit of detail on how smaller glacial systems tip, building off the major body of work by @iceybethan.bsky.social, @jeremyely.bsky.social and colleagues.
These studies showed that the Icefield's source areas predominantly sit on a flat, high plateau. As the glaciers..
These studies showed that the Icefield's source areas predominantly sit on a flat, high plateau. As the glaciers..
October 13, 2025 at 11:23 AM
In it, we've gone into quite a bit of detail on how smaller glacial systems tip, building off the major body of work by @iceybethan.bsky.social, @jeremyely.bsky.social and colleagues.
These studies showed that the Icefield's source areas predominantly sit on a flat, high plateau. As the glaciers..
These studies showed that the Icefield's source areas predominantly sit on a flat, high plateau. As the glaciers..
The #JuneauIcefield is a deeply meaningful place for me and many others, part of the reason we put so much care into our case study on tipping of Áakʼw Tʼáak Sítʼ (Mendenhall Glacier), one of the icefield's major outlet glaciers.
The study is out today as part of the Global Tipping Points Report.
The study is out today as part of the Global Tipping Points Report.
October 13, 2025 at 11:23 AM
The #JuneauIcefield is a deeply meaningful place for me and many others, part of the reason we put so much care into our case study on tipping of Áakʼw Tʼáak Sítʼ (Mendenhall Glacier), one of the icefield's major outlet glaciers.
The study is out today as part of the Global Tipping Points Report.
The study is out today as part of the Global Tipping Points Report.
others are the “network” I talk about here.
In January, I finally defended a PhD here in Berlin. And the other happy ending is that Shivani, the other PhD who had to leave our group in Boston, joined us here at PIK last year as a post-doc. Finally we have the chance to work together on Antarctica.
In January, I finally defended a PhD here in Berlin. And the other happy ending is that Shivani, the other PhD who had to leave our group in Boston, joined us here at PIK last year as a post-doc. Finally we have the chance to work together on Antarctica.
May 14, 2025 at 12:03 PM
others are the “network” I talk about here.
In January, I finally defended a PhD here in Berlin. And the other happy ending is that Shivani, the other PhD who had to leave our group in Boston, joined us here at PIK last year as a post-doc. Finally we have the chance to work together on Antarctica.
In January, I finally defended a PhD here in Berlin. And the other happy ending is that Shivani, the other PhD who had to leave our group in Boston, joined us here at PIK last year as a post-doc. Finally we have the chance to work together on Antarctica.
Super stoked to be one of the speakers at this year's #PrideHike in the beautiful Kaisergebirge! I'll be chatting all weekend about the changing alpine environment and how that impacts us ~all~, especially those of us whose happy place is up in the thin air. Thanks to Osprey (packs) Europe for (1/2)
May 7, 2025 at 2:00 PM
Super stoked to be one of the speakers at this year's #PrideHike in the beautiful Kaisergebirge! I'll be chatting all weekend about the changing alpine environment and how that impacts us ~all~, especially those of us whose happy place is up in the thin air. Thanks to Osprey (packs) Europe for (1/2)
This quote at my SBahn stop hitting differently this week.
“What a time it is when talking about trees is almost a crime. Because it involves silence about so many misdeeds!”
How I feel coming and going talking about clim. change/Michelangelo, trying to ignore the rising tide in my former home.
“What a time it is when talking about trees is almost a crime. Because it involves silence about so many misdeeds!”
How I feel coming and going talking about clim. change/Michelangelo, trying to ignore the rising tide in my former home.
March 5, 2025 at 8:29 AM
This quote at my SBahn stop hitting differently this week.
“What a time it is when talking about trees is almost a crime. Because it involves silence about so many misdeeds!”
How I feel coming and going talking about clim. change/Michelangelo, trying to ignore the rising tide in my former home.
“What a time it is when talking about trees is almost a crime. Because it involves silence about so many misdeeds!”
How I feel coming and going talking about clim. change/Michelangelo, trying to ignore the rising tide in my former home.
Now off to France with the ‘rents 😍😎.
January 21, 2025 at 10:38 AM
Now off to France with the ‘rents 😍😎.
at EGU, then AGU, the panic as friends saw at it then looked back at me. Losing the fire somewhere along the route, finding it again recently. What a decade. 🥹. So many friends. Thanks to all—it took a village.
January 21, 2025 at 10:36 AM
at EGU, then AGU, the panic as friends saw at it then looked back at me. Losing the fire somewhere along the route, finding it again recently. What a decade. 🥹. So many friends. Thanks to all—it took a village.
Did a thing last week🎓. Really thought I wouldve left it before that day came tbh.
Can remember the moment I was accepted to a PhD, 21, totally gobsmacked. The day I left Boston and that first PhD, my supervisor in the Times for harassing his students in Antarctica. The first time w/ my 🌈 pin(1/2)
Can remember the moment I was accepted to a PhD, 21, totally gobsmacked. The day I left Boston and that first PhD, my supervisor in the Times for harassing his students in Antarctica. The first time w/ my 🌈 pin(1/2)
January 21, 2025 at 10:36 AM
Did a thing last week🎓. Really thought I wouldve left it before that day came tbh.
Can remember the moment I was accepted to a PhD, 21, totally gobsmacked. The day I left Boston and that first PhD, my supervisor in the Times for harassing his students in Antarctica. The first time w/ my 🌈 pin(1/2)
Can remember the moment I was accepted to a PhD, 21, totally gobsmacked. The day I left Boston and that first PhD, my supervisor in the Times for harassing his students in Antarctica. The first time w/ my 🌈 pin(1/2)
Had a great time at this year’s TIPMIP meeting with @docaharper.bsky.social and so many others! We had a night at the Maryland Science Center and a keynote by Sen. Sheldon Whitehouse as well as many many productive science conversations 😊.
December 8, 2024 at 12:19 AM
Had a great time at this year’s TIPMIP meeting with @docaharper.bsky.social and so many others! We had a night at the Maryland Science Center and a keynote by Sen. Sheldon Whitehouse as well as many many productive science conversations 😊.
Just spent the last two weeks crisscrossing the U.S. West with my TIPMIP colleague to talk climate and Earth system tipping points. We’ve learned so much about the state of tipping research in the U.S.!
Looking forward to our next stops on the East coast before our TIPMIP General Assembly and AGU!
Looking forward to our next stops on the East coast before our TIPMIP General Assembly and AGU!
December 1, 2024 at 6:34 AM
Just spent the last two weeks crisscrossing the U.S. West with my TIPMIP colleague to talk climate and Earth system tipping points. We’ve learned so much about the state of tipping research in the U.S.!
Looking forward to our next stops on the East coast before our TIPMIP General Assembly and AGU!
Looking forward to our next stops on the East coast before our TIPMIP General Assembly and AGU!
Happening today at Lettretage in Berlin! Join for a discussion of "The Shining Mountains" by Alix Christie, and a short warm-up reading by yours truly :).
Veteranenstr. 21, doors open at 19:00, readings begin 19:30.
Veteranenstr. 21, doors open at 19:00, readings begin 19:30.
December 11, 2023 at 10:38 AM
Happening today at Lettretage in Berlin! Join for a discussion of "The Shining Mountains" by Alix Christie, and a short warm-up reading by yours truly :).
Veteranenstr. 21, doors open at 19:00, readings begin 19:30.
Veteranenstr. 21, doors open at 19:00, readings begin 19:30.
pro tip: if you power walk to work listening to an aerobics playlist wearing a beige turtleneck, white high tops, and calvins, you kinda feel like your mom in the eighties which is fun.
November 21, 2023 at 9:05 AM
pro tip: if you power walk to work listening to an aerobics playlist wearing a beige turtleneck, white high tops, and calvins, you kinda feel like your mom in the eighties which is fun.
Berlin is cool cuz you can go from this and this to that and that without an outfit change.
November 20, 2023 at 7:55 PM
Berlin is cool cuz you can go from this and this to that and that without an outfit change.
Join us on 11. Dec. at Lettretage in Berlin for a Montana-filled evening :)!
November 14, 2023 at 9:55 AM
Join us on 11. Dec. at Lettretage in Berlin for a Montana-filled evening :)!
Welcome to Bluesky @flisaacs.bsky.social! Was going through some old photos and came across this evergreen photo.... Hope to see you sometime soon here in Potsdam :)... also spotted @juliusgarbe.bsky.social (who I'm sure would be just as excited to see you too). What a morning :) :) :)
October 20, 2023 at 3:19 PM
Welcome to Bluesky @flisaacs.bsky.social! Was going through some old photos and came across this evergreen photo.... Hope to see you sometime soon here in Potsdam :)... also spotted @juliusgarbe.bsky.social (who I'm sure would be just as excited to see you too). What a morning :) :) :)
Was such a delight to see @katharinehayhoe.com at PIK today 😊. Such a nice discussion on public perceptions of climate change/policies, the role of scientists in enacting climate policy change, and the space science and scientists occupy in political arenas. Thanks for the great talk (as always)!
October 16, 2023 at 2:55 PM
Was such a delight to see @katharinehayhoe.com at PIK today 😊. Such a nice discussion on public perceptions of climate change/policies, the role of scientists in enacting climate policy change, and the space science and scientists occupy in political arenas. Thanks for the great talk (as always)!
Are you modelling or interested in tipping points? Curious about the Tipping Points Modelling Intercomparison Project (TIPMIP)? We're hosting a "TIPMIP for All" event Mon. to update folks and get them interested in joining us. Sign up at tipmipforall.bpt.me. Looking forward to seeing folks there :)!
October 5, 2023 at 10:06 AM
Are you modelling or interested in tipping points? Curious about the Tipping Points Modelling Intercomparison Project (TIPMIP)? We're hosting a "TIPMIP for All" event Mon. to update folks and get them interested in joining us. Sign up at tipmipforall.bpt.me. Looking forward to seeing folks there :)!
Few things that make me as happy as this view 😊. Also zoom in on the clouds. They’re wonky.
📍Angel Pt., Flathead Lake
📍Angel Pt., Flathead Lake
September 26, 2023 at 2:48 PM
Few things that make me as happy as this view 😊. Also zoom in on the clouds. They’re wonky.
📍Angel Pt., Flathead Lake
📍Angel Pt., Flathead Lake
First time up to the lake in four years 😍.
September 19, 2023 at 1:36 PM
First time up to the lake in four years 😍.
Road snap from here in #BigSkyCountry. Another week in beautiful Montana.
September 18, 2023 at 2:04 AM
Road snap from here in #BigSkyCountry. Another week in beautiful Montana.
Wrote a little thing a while back which became my first published essay today. It’s about when I was 16 and a page in DC, and how I fell in love with a boy for the 1st time while listening to senators debate whether that kind of thing should be accepted.
hippocampusmagazine.com/2023/09/in-t...
hippocampusmagazine.com/2023/09/in-t...
September 11, 2023 at 12:59 PM
Wrote a little thing a while back which became my first published essay today. It’s about when I was 16 and a page in DC, and how I fell in love with a boy for the 1st time while listening to senators debate whether that kind of thing should be accepted.
hippocampusmagazine.com/2023/09/in-t...
hippocampusmagazine.com/2023/09/in-t...