Guido Grosse

@grosseguido.bsky.social

770 followers 210 following 65 posts

Permafrost researcher and curious Arctic explorer, observer of rapid change. Spent some years in Alaska and Siberia, now at AWI Potsdam.

Videos

Environmental science 38%

Geology 28%

Posts Replies Media Videos

Reposted by Guido Grosse

Qiusheng Wu @giswqs.bsky.social · 4d

Introducing the Maxar Open Data Plugin for QGIS 🚀

The Maxar Open Data Program provides free high-resolution satellite imagery to support global disaster response and recovery. To date, it has released around 150,000 images totaling ~14 TB, all freely accessible through the AWS Open Data Program.

Guido Grosse @grosseguido.bsky.social · 8d

PhD position with focus on modelling of ground ice formation and rapid thaw processes in permafrost landscapes now open in our PeTCaT project. The position is at VU Amsterdam: workingat.vu.nl/vacancies/ph...

Vacancy — PhD on process-based and data-driven modeling of rapid permafrost thaw

Are you enthusiastic about climate research in the Arctic and keen to find out how the rapidly changing permafrost landscapes have developed since the last ice age and how they will respond to ongoing...

workingat.vu.nl

Reposted by Guido Grosse, Ben Bond‐Lamberty, Stephen D. Murphy , and 2 more Guido Grosse, Ben Bond‐Lamberty, Stephen D. Murphy, Jesse M. Alston, Tiziana A. Gelmi‐Candusso

Qiusheng Wu @giswqs.bsky.social · 11d

🎁 A New Year’s gift to the geospatial community: a brand-new QGIS plugin that unlocks access to 80+ petabytes of satellite imagery and geospatial datasets with zero coding required.

Reposted by Peter Thorne, Guido Grosse, Benjamin I. Cook , and 1 more Peter Thorne, Guido Grosse, Benjamin I. Cook, Kevin J. Anchukaitis

Quanta Magazine @quantamagazine.bsky.social · 16d

Paleoclimatologist Jessica Tierney recently published a global temperature record covering almost the past half-billion years. According to her model, 50 million years ago, inland temperatures approached 122 degrees Fahrenheit. www.quantamagazine.org/climate-extr...

Reposted by Guido Grosse

Rick Thoman @alaskawx.bsky.social · 29d

We’ve got a piece in The Conversation about the 2025 Arctic Report Card and the implications of 20 years of tracking rapid Arctic change. #Arctic #akwx #Climate

theconversation.com/from-record-...

From record warming to rusting rivers, 2025 Arctic Report Card shows a region transforming faster than expected

The 20th anniversary of the annual report tracks how sea ice, snow cover and many other vital signs of the Arctic have changed, and the impact that’s having on people and wildlife.

theconversation.com

Reposted by Guido Grosse, John Mecklin

Peter Gleick @petergleick.bsky.social · 29d

As long correctly predicted by global #climate models...

"New report finds the Arctic continues to warm faster than the planet as a whole"

www.npr.org/2025/12/16/n...

New report finds the Arctic continues to warm faster than the planet as a whole

This year's Arctic Report Card from the National Oceanic and Atmospheric Administration finds that the northernmost part of the Earth is warming faster than the global average, leading to melting glac...

www.npr.org

Reposted by Guido Grosse

The Associated Press @apnews.com · Nov 23

Storms that battered Alaska’s western coast this fall have brought renewed attention to low-lying Indigenous villages left increasingly vulnerable by climate change.

Alaska Native villages have few options and little US help as climate change devours their land

Storms that battered Alaska’s western coast this fall have brought renewed attention to low-lying Indigenous villages left increasingly vulnerable by climate change.

bit.ly

Guido Grosse @grosseguido.bsky.social · Nov 3

Nina published her new inventory of retrogressive thaw slumps in West Siberia, covering the Yamal, Gydan, and Tazovsky peninsulas. Thaw slumps evolve by rapidly melting ground ice in very ice-rich permafrost. The dataset is based on high-res sat data and manual verification. doi.org/10.5194/essd...

High-resolution inventory and classification of retrogressive thaw slumps in West Siberia

Abstract. Permafrost thaw disrupts ecosystems, hydrology, and biogeochemical cycles, reinforcing climate change through a positive permafrost-carbon feedback loop. Thaw can be gradual, deepening the a...

doi.org

Reposted by Guido Grosse

Thomas Opel @thomasopel.bsky.social · Oct 20

Die @zeit.de hat über einen See in Alaska berichtet, der aufgrund der Degradation von #Permafrost ausgelaufen ist und über damit zusammenhängende Forschung des @awi.de sowie Kooperationspartnern (Geschenk-Link): www.zeit.de/2025/44/klim....

Klimawandel: Und plötzlich war kein See mehr da

In Alaska verschwindet binnen Stunden ein See. Der Grund: tauender Permafrost. Forscher wollen nun wissen, wann das System kippen könnte und ganze Landschaften verändern.

www.zeit.de

Reposted by Guido Grosse, Doerthe Tetzlaff, Dustin Mulvaney

Rick Thoman @alaskawx.bsky.social · Oct 14

I’ve got a short piece up in The Conversation on the catastrophic flooding in Southwest Alaska from ex-typhoon Halong and the challenges of recovery work. #akwx #ExtremeWeather #Alaska #AlaskaSky

theconversation.com/typhoon-leav...

Typhoon leaves flooded Alaska villages facing a storm recovery far tougher than most Americans will ever experience

‘As the storm approached Alaska, everything went sideways,’ leaving people no time to evacuate and little time to prepare. An Alaska meteorologist explains what happened and the challenges ahead.

theconversation.com

Reposted by Guido Grosse

Dr. Evan J. Gowan @evangowan.bsky.social · Oct 13

There aren't very many proxies of past sea level during the Last Glacial Maximum (27,000-19,000 ybp). Jones et al present a sediment core from Beringia that transitioned from being a lake to being submerged by the ocean during the early parts of the deglaciation. www.tandfonline.com/doi/abs/10.1...

Sea-level driven isolation of glacial plant refugia revealed by submerged lake sediment from the Bering Land Bridge and St. Matthew Island

Bering Land Bridge (BLB) climate and vegetation during the Last Glacial Maximum (LGM) remains largely understudied, given challenges associated with collecting records from the submerged BLB. Previ...

www.tandfonline.com

Guido Grosse @grosseguido.bsky.social · Oct 12

Nice study with a large database of driftwood samples 👍. Carl will be venturing into various aspects of recent Arctic driftwood dynamics with remote sensing and AI over the next few years.

Guido Grosse @grosseguido.bsky.social · Oct 12

Thanks - yes, Carl is working on this.

Reposted by David N. Thomas

Guido Grosse @grosseguido.bsky.social · Oct 12

The many uses of #driftwood: the first large-scale mapping of Arctic coastlines. #AWI Press release for Carl‘s paper using AI to map driftwood abundance along the North American arctic coast with Planet satellite imagery. www.awi.de/en/about-us/...

Multitalent Treibholz: Erste großflächige Kartierung an arktischen Küsten - AWI

Driftwood plays a key role in Arctic coastal ecosystems: it stores carbon, stabilises coastlines and provides a habitat for animals. At the same time, it can offer clues regarding climate change in the Arctic region, providing information on the likes of storm surges, coastal erosion and shifting fluvial dynamics. Despite the crucial role it plays, there is still a lot that we do not know about the large-scale distribution patterns of driftwood. Now, for the first time, researchers from the Alfred Wegener Institute have systematically mapped driftwood deposits along an 11,000 kilometre stretch of coastline in Alaska and North West Canada, using satellite imagery and AI-powered evaluation methods. The result is the largest database ever produced, with researchers able to identify over 19,000 stable driftwood deposits. The findings will soon be published in the Scientific Reports journal.

www.awi.de

Reposted by Guido Grosse

Alaska Ocean Observing System (AOOS) @aoos-alaska.bsky.social · Oct 8

Thinking of everyone in Kotzebue braving this storm — stay safe! 💙🌊

View local water level data (not all data is up to the minute):
🔗 water-level-watch.portal.aoos.org#metadata/100...

More info: awlw.aoos.org

@alaskaskies.bsky.social @alaskawx.bsky.social

Guido Grosse @grosseguido.bsky.social · Oct 8

Unser neues #permafrost Projekt PeTCaT @awi.de ist offiziell gestartet: Wir werden in den kommenden 5 Jahren mit einem großartigen internationalen Team zum schnellen Permafrosttauen forschen und einige der wichtigsten Fragen zum Permafrost-Kohlenstoff-Feedback beantworten: www.awi.de/ueber-uns/se...

„PeTCaT“ untersucht den Einfluss von Treibhausgasen aus schnell tauendem Permafrost - AWI

Permafrost in der Arktis speichert große Mengen an organischem Kohlenstoff in gefrorenen Böden und tieferen Ablagerungen. Doch die Arktis erwärmt sich besonders schnell und lässt diese Speicher auftauen. Die Folge: Immer mehr Treibhausgase aus den Böden gelangen in die Atmosphäre. Wo und wie schnell Permafrost auftaut, ist erst wenig erforscht, ebenso wie die Prozesse, die das Tauwetter antreiben. Das internationale Projekt PeTCaT will insbesondere die Wissenslücken um schnelle Tauprozesse schließen. Unter der Leitung des Alfred-Wegener-Instituts werden Forschende aus Deutschland, den USA, Kanada, den Niederlanden und Schweden einen neuartigen Datensatz aufbauen, mit dem sie die möglichen Entwicklungen und Einflüsse von Treibhausgasen aus tauendem Permafrost projizieren können. Gefördert wird das Projekt von der gemeinnützigen Organisation Schmidt Sciences.

www.awi.de

Guido Grosse @grosseguido.bsky.social · Oct 3

The #PeTCaT team includes researchers from UAF, UofA, UHH, VUA, SU, WARC, ARI, and NTGS with expertise in permafrost, soil carbon, carbon fluxes, greenhouse gases, limnology, ground ice, plant-soil interactions, spatial analysis, remote sensing, deep learning, and process and Earth system modelling.

Reposted by Richard Davy

Guido Grosse @grosseguido.bsky.social · Oct 3

I am happy to announce that we received major funding from Schmidt Sciences under their VICC program to study rapid #Permafrost Thaw Carbon Trajectories (PeTCaT). The 5-year project led by my team @awi.de partners with an international team to quantify how rapid thaw contributes to climate change.

Schmidt Sciences @schmidtsciences.bsky.social · Oct 2

We're investing $45M over 5 years to launch the Virtual Institute for the Carbon Cycle (VICC).

Four global teams will combine AI, advanced observations & modeling to close major carbon cycle gaps, strengthening climate projections worldwide.

🔗 buff.ly/8WVpM9s
WIRED coverage: buff.ly/YsLAcRZ

Schmidt Sciences awards $45M to narrow carbon cycle knowledge gap - Schmidt Sciences

Globe-spanning interdisciplinary teams will dramatically improve climate modeling to drive better energy, environmental, economic decision making Contact: Carlie Wiener, [email protected]…

www.schmidtsciences.org

Reposted by Guido Grosse

Schmidt Sciences @schmidtsciences.bsky.social · Oct 2

Schmidt Sciences awards $45M to narrow carbon cycle knowledge gap - Schmidt Sciences

Globe-spanning interdisciplinary teams will dramatically improve climate modeling to drive better energy, environmental, economic decision making Contact: Carlie Wiener, [email protected]…

www.schmidtsciences.org

Reposted by Guido Grosse

Dave in AK @bikewritedave.bsky.social · Sep 30

UAF people and Fairbanks residents:

Reposted by Guido Grosse

Brendan O’Neill @permafrostee.bsky.social · Sep 28

Our latest ground ice mapping. This time improved maps of the Mackenzie Valley and Delta regions, both areas with significant existing and proposed infrastructure. Behind the scenes we are modelling away in other areas toward Ground Ice Map of Canada V2 1/ www.researchgate.net/publication/...

(PDF) Preliminary ground ice modelling of the Mackenzie Valley and Delta regions, Northwest Territories, Canada

PDF | New regional-scale ground ice modelling for the Mackenzie Valley and Delta regions, based on surficial geology aligned with the Geological Survey... | Find, read and cite all the research you ne...

www.researchgate.net

Reposted by Guido Grosse

Science Magazine @science.org · Sep 23

Long-buried layers of saline permafrost seem to be accelerating climate change’s transformation of the Arctic. https://scim.ag/46AxH2E

Even subzero parts of the Arctic are thawing. Ancient salt is the culprit

Long-buried layers of saline permafrost seem to be accelerating climate change's transformation of the Arctic

scim.ag

Guido Grosse @grosseguido.bsky.social · Sep 14

Our new study led by Carl Stadie is using #deeplearning U-Net methods to train on aerial imagery and then analyzed ~32,000 high-res #PlanetScope images across 1.3 million sqkm of the North American Arctic #coastline, mapping close to 20,000 #driftwood deposits. @awi.de www.nature.com/articles/s41...

Large driftwood accumulations along arctic coastlines and rivers - Scientific Reports

Scientific Reports - Large driftwood accumulations along arctic coastlines and rivers

www.nature.com

Reposted by Philip Bell

Guido Grosse @grosseguido.bsky.social · Sep 11

A new PNAS study links #permafrost thaw and water toxicity levels from metal concentrations. This is bad news for Arctic rivers, their ecosystems, and food chains: www.pnas.org/doi/full/10..... Salmon River in NW Alaska, once praised for its pristine waters, has turned toxic to aquatic life.

Wild, scenic, and toxic: Recent degradation of an iconic Arctic watershed with permafrost thaw | PNAS

The streams of Alaska’s Brooks Range lie within a vast (~14M ha) tract of protected wilderness and have long supported both resident and anadromous...

www.pnas.org

Guido Grosse @grosseguido.bsky.social · Aug 31

New @awi.de study by Inauen et al developed a machine learning method to map landscape-scale #permafrost thaw such as baydzherakh development and thermo-erosion gully change in North Siberia with panchromatic historical Hexagon spy imagery and modern panchromatic sat imagery. doi.org/10.1029/2024...

Using Texture‐Based Image Segmentation and Machine Learning With High‐Resolution Satellite Imagery to Assess Permafrost Degradation Landforms in the Russian High Arctic

Image segmentation enables landscape-scale mapping of permafrost degradation stages based on their texture in panchromatic imagery Convolutional Neural Networks outperform feature-based Random Fo...

doi.org

Reposted by Guido Grosse

Doomer Girl News @doomergirlnews.bsky.social · Aug 29

Study by researchers at the University of Gothenburg shows that almost half of the rising carbon dioxide emissions after the ice age may have come from thawing permafrost.

phys.org/news/2025-08...

Thawing permafrost raised carbon dioxide levels after the last ice age, study shows

Carbon dioxide levels in the atmosphere vary naturally between ice ages and interglacial periods. A new study by researchers at the University of Gothenburg shows that an unexpectedly large proportion...

phys.org

Reposted by Guido Grosse, Santiago Gassó

Paul Voosen @voosen.me · Aug 29

The NSF-funded Arctic Research Consortium of the United States (ARCUS) will shut down at the end of Sept. ARCUS has been around since the late 80s; in recent years their staff had dwindled, and NSF said earlier this year that their grant would not be renewed. Another blow to polar science.

ARCUS Monthly Report - August 2025

mailchi.mp

Reposted by Guido Grosse, Ben Bond‐Lamberty

David Olefeldt @olefeldt.bsky.social · Aug 28

New study where McKenzie Kuhn, I and co-authors show that accounting for differences among wetland and lake types is crucial for estimating current and future boreal-Arctic methane emissions – out now in Nature Climate Change.

www.nature.com/articles/s41...