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Reposted by Aslak Grinsted

Helle Astrid Kjær @h-a-kjaer.bsky.social · Jun 8

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

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Aslak Grinsted @glaciology.net · Jun 5

Here's the code: github.com/grinsted/pop...

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Aslak Grinsted @glaciology.net · Jun 2

A PhD fellowship in computational and mathematical modelling of flow and fracture in ice sheets.

jobportal.ku.dk/phd/?show=16...

Application deadline tomorrow

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Aslak Grinsted @glaciology.net · May 26

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...

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

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Reposted by Aslak Grinsted

Paul Bierman @paul-bierman.bsky.social · May 23

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...

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

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Aslak Grinsted @glaciology.net · May 22

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)

5 random places in EU . Shows how my ML model 'guesses' where people live.

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Aslak Grinsted @glaciology.net · May 21

I solved it using np.ix_ ... (But it makes no sense to me why they would not be equivalent)

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Aslak Grinsted @glaciology.net · May 21

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!

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Aslak Grinsted @glaciology.net · May 19

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).

Group photo of the ice coring crew at Müller ice cap posing with the bottom part of the ice core. A sign says "Müller ice cap 613m"

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Aslak Grinsted @glaciology.net · May 14

They got the EGRIP camp weather data flowing out of camp. alice.egrip.camp

screenshot of the EGRIP weather web page.

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Reposted by Aslak Grinsted

Mike Sowden @mikeachim.bsky.social · May 12

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/

Unsplash photo by Tino Rischawy of a large wave crashing against rock.

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Aslak Grinsted @glaciology.net · May 12

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...

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Aslak Grinsted @glaciology.net · May 8

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
🥲

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Aslak Grinsted @glaciology.net · May 6

An open position for a Global climate and ice sheet modelling scientist at DMI.

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

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Reposted by Aslak Grinsted

Adrian Luckman @adrianluckman.bsky.social · May 1

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

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Aslak Grinsted @glaciology.net · May 1

Alot of ML at EGU. Some of it good, but also some pretty random stuff.

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Reposted by Aslak Grinsted

Andrea Securo @andreasecuro.bsky.social · Apr 28

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 😞

Polar Geospatial Center @polargeospatial.bsky.social · Apr 28

📢 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

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Reposted by Aslak Grinsted

Uofficiel dr.dk nyheder bot @drdk-nyheder-bot.bsky.social · Apr 23

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

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Reposted by Aslak Grinsted

Tas van Ommen @tasvo.bsky.social · Apr 15

#IPICS followers take note. The icecore subcategory is around 4GB and probably worth having at hand. #AlexandriaLibraryLuddites

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Aslak Grinsted @glaciology.net · Apr 13

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

Helle Astrid Kjær @h-a-kjaer.bsky.social · Apr 11

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

PhD fellowship in computational and mathematical modelling of flow and fracture in ice sheets

jobportal.ku.dk

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Reposted by Aslak Grinsted

Ruth Mottram @ruthmottram.bsky.social · Apr 10

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...

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

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Reposted by Aslak Grinsted

Helle Astrid Kjær @h-a-kjaer.bsky.social · Apr 7

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

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Aslak Grinsted @glaciology.net · Apr 2

Scandinavia in March vs April
#modis

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Aslak Grinsted @glaciology.net · Mar 26

The background is that the students implemented a shallow water tsunami model immediately prior to me showing this, and the numerical scheme and code is so similar ... Hopefully makes it easy to understand.