Aslak Grinsted
@glaciology.net
Associate Professor at the Niels Bohr Institute, University of Copenhagen. Interested in ice, climate, sea level, and extreme events. 🧪 ❄️ 🌊 🌀 🥼 🌡️
Dad of two teen girls, and one toddler boy.
Also on mastodon here: @[email protected]
Dad of two teen girls, and one toddler boy.
Also on mastodon here: @[email protected]
I just downloaded a textbook in epub format. It is actually possible to read it on my phone. (Unlike the pdf). I like it.
November 17, 2025 at 6:20 PM
I just downloaded a textbook in epub format. It is actually possible to read it on my phone. (Unlike the pdf). I like it.
Reposted by Aslak Grinsted
This is cool, 6 million year old ice from Antartica with inferred temperature ~12°C warmer than the late Pleistocene. No CO2 level yet! (That will be highly anticipated!)
www.pnas.org/doi/10.1073/...
www.pnas.org/doi/10.1073/...
PNAS
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans...
www.pnas.org
October 28, 2025 at 8:51 PM
This is cool, 6 million year old ice from Antartica with inferred temperature ~12°C warmer than the late Pleistocene. No CO2 level yet! (That will be highly anticipated!)
www.pnas.org/doi/10.1073/...
www.pnas.org/doi/10.1073/...
Reposted by Aslak Grinsted
Our traverse fieldwork had been accomplished www.green2ice.eu/2025/06/07/j...
June 7: Success! The casing of the GRIP borehole finally located – green2ice.eu
www.green2ice.eu
June 8, 2025 at 3:16 PM
Our traverse fieldwork had been accomplished www.green2ice.eu/2025/06/07/j...
A PhD fellowship in computational and mathematical modelling of flow and fracture in ice sheets.
jobportal.ku.dk/phd/?show=16...
Application deadline tomorrow
jobportal.ku.dk/phd/?show=16...
Application deadline tomorrow
June 2, 2025 at 4:29 AM
A PhD fellowship in computational and mathematical modelling of flow and fracture in ice sheets.
jobportal.ku.dk/phd/?show=16...
Application deadline tomorrow
jobportal.ku.dk/phd/?show=16...
Application deadline tomorrow
Woodworth and Rowe 2018: The tidal measurements of James Cook during the voyage of the Endeavour
(Cool paper and cool journal)
hgss.copernicus.org/articles/9/8...
(Cool paper and cool journal)
hgss.copernicus.org/articles/9/8...
The tidal measurements of James Cook during the voyage of the Endeavour
Abstract. The main priority of the first of James Cook's famous voyages of discovery
was the observation of the transit of Venus at Tahiti. Following that, he was
ordered to embark on a search for new...
hgss.copernicus.org
May 26, 2025 at 7:13 AM
Woodworth and Rowe 2018: The tidal measurements of James Cook during the voyage of the Endeavour
(Cool paper and cool journal)
hgss.copernicus.org/articles/9/8...
(Cool paper and cool journal)
hgss.copernicus.org/articles/9/8...
Reposted by Aslak Grinsted
We lost a giant in polar and climate science this spring. Chet Langway, a man who was there at the start of ice core science and kept miles of cores frozen for decades of scientific study.
❄️🧪💙📚
#scicomm
#climate
#UVMresearch
#science
🌎 🔬 ⚒️
#ClimateHealth
www.buffalo.edu/ubnow/storie...
❄️🧪💙📚
#scicomm
#climate
#UVMresearch
#science
🌎 🔬 ⚒️
#ClimateHealth
www.buffalo.edu/ubnow/storie...
Remembering Chet Langway
Considered the pioneer of ice core drilling, the late UB professor emeritus' work extracting climate data from ice sheets continues at the university today.
www.buffalo.edu
May 23, 2025 at 3:18 PM
We lost a giant in polar and climate science this spring. Chet Langway, a man who was there at the start of ice core science and kept miles of cores frozen for decades of scientific study.
❄️🧪💙📚
#scicomm
#climate
#UVMresearch
#science
🌎 🔬 ⚒️
#ClimateHealth
www.buffalo.edu/ubnow/storie...
❄️🧪💙📚
#scicomm
#climate
#UVMresearch
#science
🌎 🔬 ⚒️
#ClimateHealth
www.buffalo.edu/ubnow/storie...
I have built a cool little prototype ML algo that can estimate population density in 20m resolution from S2 imagery.
Here are 5 examples.
Row1: Sentinel-2. (input data)
Row2: population density from eurostat. (input data)
Row3: ML model population density. (output data)
Here are 5 examples.
Row1: Sentinel-2. (input data)
Row2: population density from eurostat. (input data)
Row3: ML model population density. (output data)
May 22, 2025 at 11:11 AM
I have built a cool little prototype ML algo that can estimate population density in 20m resolution from S2 imagery.
Here are 5 examples.
Row1: Sentinel-2. (input data)
Row2: population density from eurostat. (input data)
Row3: ML model population density. (output data)
Here are 5 examples.
Row1: Sentinel-2. (input data)
Row2: population density from eurostat. (input data)
Row3: ML model population density. (output data)
Why do these 2 numpy lines not give the same result? Aaargh!
data[range(1,3),range(1,3)].shape -> (2,)
data[1:3,1:3].shape -> (2,2)
I don't want the diagonal!
data[range(1,3),range(1,3)].shape -> (2,)
data[1:3,1:3].shape -> (2,2)
I don't want the diagonal!
May 21, 2025 at 6:28 PM
Why do these 2 numpy lines not give the same result? Aaargh!
data[range(1,3),range(1,3)].shape -> (2,)
data[1:3,1:3].shape -> (2,2)
I don't want the diagonal!
data[range(1,3),range(1,3)].shape -> (2,)
data[1:3,1:3].shape -> (2,2)
I don't want the diagonal!
Bedrock reached at the Ice coring on Müller ice cap (Axel Heiberg Island).
I bet that we would reach at 611m --- pretty close to the final 613m. (Bo guessed 612m so i didn't win).
I bet that we would reach at 611m --- pretty close to the final 613m. (Bo guessed 612m so i didn't win).
May 19, 2025 at 10:02 AM
Bedrock reached at the Ice coring on Müller ice cap (Axel Heiberg Island).
I bet that we would reach at 611m --- pretty close to the final 613m. (Bo guessed 612m so i didn't win).
I bet that we would reach at 611m --- pretty close to the final 613m. (Bo guessed 612m so i didn't win).
They got the EGRIP camp weather data flowing out of camp. alice.egrip.camp
May 14, 2025 at 2:24 PM
They got the EGRIP camp weather data flowing out of camp. alice.egrip.camp
Reposted by Aslak Grinsted
The resulting cataclysmic backsplash of water - a MEGATSUNAMI - was around 200 metres tall, and sent 100-metre-high waves racing across the fjord to smash against the other side of it.
(This is still not the crazy bit!)
5/
(This is still not the crazy bit!)
5/
May 12, 2025 at 3:41 PM
The resulting cataclysmic backsplash of water - a MEGATSUNAMI - was around 200 metres tall, and sent 100-metre-high waves racing across the fjord to smash against the other side of it.
(This is still not the crazy bit!)
5/
(This is still not the crazy bit!)
5/
Crude estimate of the bicycle accident risk per km. (Sure to convince my teen girls to wear their helmets.)
Numbers for denmark:
Accidents: 15000 per year
Trips: 2e6 per day
Avg trip length: 3.2km
=Approx: 1 accident per 150e3 km
stormgmtpbie.z6.web.core.windows.net/cykelregnska...
Numbers for denmark:
Accidents: 15000 per year
Trips: 2e6 per day
Avg trip length: 3.2km
=Approx: 1 accident per 150e3 km
stormgmtpbie.z6.web.core.windows.net/cykelregnska...
May 12, 2025 at 2:51 PM
Crude estimate of the bicycle accident risk per km. (Sure to convince my teen girls to wear their helmets.)
Numbers for denmark:
Accidents: 15000 per year
Trips: 2e6 per day
Avg trip length: 3.2km
=Approx: 1 accident per 150e3 km
stormgmtpbie.z6.web.core.windows.net/cykelregnska...
Numbers for denmark:
Accidents: 15000 per year
Trips: 2e6 per day
Avg trip length: 3.2km
=Approx: 1 accident per 150e3 km
stormgmtpbie.z6.web.core.windows.net/cykelregnska...
Greenland accumulation in terms of cucumbers.
* Greenland acc = ~600Gt/yr.
* global pop = ~9bn.
So ~7.5 kg/person/hour
* cucumber water content = ~166g
So ~45 cucumbers/person/hour
Unfortunately global cucumber production is only 95 Mt/yr
= 1.2 cucumber/person/week
🥲
* Greenland acc = ~600Gt/yr.
* global pop = ~9bn.
So ~7.5 kg/person/hour
* cucumber water content = ~166g
So ~45 cucumbers/person/hour
Unfortunately global cucumber production is only 95 Mt/yr
= 1.2 cucumber/person/week
🥲
May 8, 2025 at 7:20 AM
Greenland accumulation in terms of cucumbers.
* Greenland acc = ~600Gt/yr.
* global pop = ~9bn.
So ~7.5 kg/person/hour
* cucumber water content = ~166g
So ~45 cucumbers/person/hour
Unfortunately global cucumber production is only 95 Mt/yr
= 1.2 cucumber/person/week
🥲
* Greenland acc = ~600Gt/yr.
* global pop = ~9bn.
So ~7.5 kg/person/hour
* cucumber water content = ~166g
So ~45 cucumbers/person/hour
Unfortunately global cucumber production is only 95 Mt/yr
= 1.2 cucumber/person/week
🥲
An open position for a Global climate and ice sheet modelling scientist at DMI.
candidate.hr-manager.net/ApplicationI...
candidate.hr-manager.net/ApplicationI...
Global climate and ice sheet modelling scientist
The Danish Meteorological Institute (DMI) opens a 4 year, full-time position for a scientist to work on global climate modeling with a particular focus on how c
candidate.hr-manager.net
May 6, 2025 at 1:33 PM
An open position for a Global climate and ice sheet modelling scientist at DMI.
candidate.hr-manager.net/ApplicationI...
candidate.hr-manager.net/ApplicationI...
Reposted by Aslak Grinsted
Large fractures continue to open up at the grounding line of Thwaites Glacier Eastern Ice Shelf. Animation contains @copernicusland.bsky.social #Sentinel-1C data alongside 1A and 1B
May 1, 2025 at 1:08 PM
Large fractures continue to open up at the grounding line of Thwaites Glacier Eastern Ice Shelf. Animation contains @copernicusland.bsky.social #Sentinel-1C data alongside 1A and 1B
Alot of ML at EGU. Some of it good, but also some pretty random stuff.
May 1, 2025 at 6:21 PM
Alot of ML at EGU. Some of it good, but also some pretty random stuff.
Reposted by Aslak Grinsted
It's so sad to see that this incredible dataset, which has redefined how we approach many Arctic-related studies, may not be updated in the future 😞
📢 The final ArcticDEM & REMA release is here - and it might be the last. Funding cuts put vital polar data at risk. Help us rally support: take the survey! 🔗https://z.umn.edu/pgc-dem-survey #PolarScience #SavePolarData
April 28, 2025 at 8:40 PM
It's so sad to see that this incredible dataset, which has redefined how we approach many Arctic-related studies, may not be updated in the future 😞
Reposted by Aslak Grinsted
Norge vil lokke forskere til landet: 'Det handler især om situationen i USA'. I Norge har Forskningsrådet, der prioriterer og deler penge ud på vegne af staten, afsat 100 millioner norske kroner (cirka 63 millioner kroner) til at lokke udenlandske forskere til landet.
Norge vil lokke forskere til landet: 'Det handler især om situationen i USA'
I Norge har Forskningsrådet, der prioriterer og deler penge ud på vegne af staten, afsat 100 millioner norske kroner (cirka 63 millioner kroner) til at lokke udenlandske forskere til landet.
www.dr.dk
April 23, 2025 at 5:54 AM
Norge vil lokke forskere til landet: 'Det handler især om situationen i USA'. I Norge har Forskningsrådet, der prioriterer og deler penge ud på vegne af staten, afsat 100 millioner norske kroner (cirka 63 millioner kroner) til at lokke udenlandske forskere til landet.
Reposted by Aslak Grinsted
#IPICS followers take note. The icecore subcategory is around 4GB and probably worth having at hand. #AlexandriaLibraryLuddites
April 15, 2025 at 9:16 AM
#IPICS followers take note. The icecore subcategory is around 4GB and probably worth having at hand. #AlexandriaLibraryLuddites
I need a new circular saw and would like the batteries to be compatible with my other DeWalt tools. But i am wondering if i should jump ship to some non-US brand. Also - they apparently have extra high exposure to the tariff situation.
April 13, 2025 at 2:55 PM
I need a new circular saw and would like the batteries to be compatible with my other DeWalt tools. But i am wondering if i should jump ship to some non-US brand. Also - they apparently have extra high exposure to the tariff situation.
Reposted by Aslak Grinsted
Come work with us PhD fellowship modelling flow and fracture in #ice sheets
jobportal.ku.dk/phd/?show=16...
(application deadline 3 June) @precise-project.bsky.social
jobportal.ku.dk/phd/?show=16...
(application deadline 3 June) @precise-project.bsky.social
PhD fellowship in computational and mathematical modelling of flow and fracture in ice sheets
jobportal.ku.dk
April 11, 2025 at 5:27 PM
Come work with us PhD fellowship modelling flow and fracture in #ice sheets
jobportal.ku.dk/phd/?show=16...
(application deadline 3 June) @precise-project.bsky.social
jobportal.ku.dk/phd/?show=16...
(application deadline 3 June) @precise-project.bsky.social
Reposted by Aslak Grinsted
Who wants to work on the Arctic in Copenhagen? Super postdoc job going with our friends at Aarhus University* together with DMI on climate modelling and Arctic influences on the mid-latitudes:
*at a campus not actually in Aarhus but just outside Copenhagen
international.au.dk/about/profil...
*at a campus not actually in Aarhus but just outside Copenhagen
international.au.dk/about/profil...
Postdoc in Climate Modelling and Arctic-Midlatitude Connections - Vacancy at Aarhus University
Vacancy at Department of Environmental Science - Atmospheric Emissions & Modelling, Aarhus University
international.au.dk
April 10, 2025 at 3:41 PM
Who wants to work on the Arctic in Copenhagen? Super postdoc job going with our friends at Aarhus University* together with DMI on climate modelling and Arctic influences on the mid-latitudes:
*at a campus not actually in Aarhus but just outside Copenhagen
international.au.dk/about/profil...
*at a campus not actually in Aarhus but just outside Copenhagen
international.au.dk/about/profil...
Reposted by Aslak Grinsted
This week is your last chance to apply for the Ice core Analysis and Techniques PhD school indico.nbi.ku.dk/event/2111/ #P2F #Icelink @precise-project.bsky.social
ICAT PhD School 2025
Ice Core Analysis Techniques (ICAT) PhD school-2025 Supported by: University of Copenhagen and the Novo Nordic Foundation funded project PRECISE, the H2020 projects Icelink and P2F and the DFF project...
indico.nbi.ku.dk
April 7, 2025 at 7:21 AM
This week is your last chance to apply for the Ice core Analysis and Techniques PhD school indico.nbi.ku.dk/event/2111/ #P2F #Icelink @precise-project.bsky.social
The Overleaf integrations with git and zotero is so great.
New figures will appear in Overleaf when I commit and bib file sync also only takes a click.
New figures will appear in Overleaf when I commit and bib file sync also only takes a click.
March 26, 2025 at 6:36 PM
The Overleaf integrations with git and zotero is so great.
New figures will appear in Overleaf when I commit and bib file sync also only takes a click.
New figures will appear in Overleaf when I commit and bib file sync also only takes a click.