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Greg Cocks @GregCocks@techhub.social

New Map Of Landscape Beneath Antarctica Unveiled
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https://phys.org/news/2025-03-landscape-beneath-antarctica-unveiled.html <-- shared technical article
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https://doi.org/10.1038/s41597-025-04672-y <-- shared paper
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#GIS #spatial #mapping #Bedmap3 #icebed #surface #thickness #gridded #datasets #Antarctica #raster #model #modeling #landscape #elevation #icesheet #survey #remotesensing #earthobservation #climatechange #warming #climate #melt #melting #seafloor #subglacial #geophysical #survey #topography #geology #bathymetry #topobathy #BritishAntarcticSurvey
@BritishAntarcticSurvey

schematic / flow chart - Schematic showing the Bedmp3 source datasets (white boxes) combining to make intermediate products (blue boxes) and ultimately the final set of grids (orange boxes) and their uncertainties (yellow boxes). Note that the surface grid has a uniform estimated uncertainty (Section Uncertainty estimates).

maps - Bedmap3 grids of (a) bed topography and (b) surface elevation, in metres above sea level (g104c geoid), and (c) ice thickness in metres. Locations labelled in (b) are referred to in the text

The BedMachine v3 bed has some subjective advantages over Bedmap3 where glacier flow is relatively fast, but survey data are sparse. (a) Surface flow speed43; (b) BedMachine v3 bed topography; (c) Bedmap3 bed topography, both overlaid on shaded relief and with survey data shown as grey lines. The black dotted line highlights a trough under slow-flowing ice that is more smoothly continuous in Bedmap3. The white oval highlights the trough of a relatively fast-flowing ice stream that in BedMachine v3 is more smoothly streamlined and subjectively more realistic than in Bedmap3, given the typical streamlined form of deglaciated ice stream landscapes. An objective test of bed accuracy in this area requires more survey data.

maps - The Bedmap3 survey dataset allows us to calibrate the more continuous and extensive freeboard-based ice shelf thickness grid. (a) Pointwise ice thickness biases between 119,000 survey measurements and the freeboard-derived ice thickness grid47 on the Ross Ice Shelf, showing coherent patterns of bias; (b) these pointwise offsets median-filtered over a 20 km radius; (c) spline-interpolated calibration grid of the filtered offsets in (b); (d) bias-corrected version of the freeboard-derived ice thickness grid after subtraction of the calibration grid in (c).

Greg Cocks @GregCocks@techhub.social

Glacial Lake Mapping Using Remote Sensing Geo-Foundation Model
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https://doi.org/10.1016/j.jag.2025.104371 <-- shared paper
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HIGHLIGHTS:
• Proposed U-ViT model based on Prithvi GFM for multi-sensor glacial lake mapping.
• Achieved an F1 score of 0.894 on Sentinel-1&2, surpassing CNNs scoring below 0.8.
• Maintains strong performance with 50% less training data, proving efficiency.
• Excels in detecting small lakes (<0.01km²) and handling clouds and complex terrains..."
#GIS #spatial #mapping #glaciallake #GeospatialFoundationModel #satellite #Sentinel #GaoFen #remotesensing #earthobservation #model #modeling #climatechange #glacial #glacier #melt #melting #UViT #deepleanring #AI #framework #performance #metrics #opensource

phot - glacier with glacial lake, Karakoram mountain range

Y⃒̸̷̝̜̙ͥͥͥngmar @yngmar@social.tchncs.de

Drippy icicles. The roof is warming in the sun, but it's still -4°C. Perfect icicle weather.

GIF

#Icicle #Ice #Snow

GarretSidzaka @GarretSidzaka@mastodon.social

A serious geologic issue is occurring in Canada and Alaska.
https://www.youtube.com/watch?v=Lxfpgqn6NOo
#environment #climatechange #river #permafrost #melting #emergency #canada #alaska #unitedstates #usa

a screenshot of google earths depicting a red pin near a river. to the left of the pin the river is normal colored, to the right the river is a very clearly a sickly orange color.

Greg Cocks @GregCocks@techhub.social

Permafrost Thaw Threatens Up To 3 Million People In The Arctic
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https://phys.org/news/2025-01-permafrost-threatens-million-people-arctic.html <-- shared technical article
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https://doi.org/10.1038/s43247-024-01883-w <-- shared paper
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#GIS #spatial #mapping #arctic #climatechange #permafrost #thaw #communities #impacts #humanimpacts #infrastructure #risk #hazard #northernhemisphere #global #threat #Sweden #greenland #alaska #yukon #russia #canada #norway #landuse #melting #ecosystems #livelihoods #firstnation #indigenous #inhabitants #population #cost #economics #policymaking #planning #management #spatialanalysis #adapation #transportation #supplies #waterquality #watersecurity #foodsecurity #disease #contaminants #multifactor #analysis #MFA #social #culture #cultural #transdisciplinary #ground #temperature #physicalprocesses #consequences #mobility #supplies #biogeochemical #water #hydrology #engineeringgeology #erosion #ecosystem #FATE

schematic - Composite overview synthesizing the risks from permafrost thaw identified across the four study areas

map - Map of the study areas and trends in the ground temperature over the period 2000–2019

photo - A drone picture shows private houses on a territory of former airfield, damaged by thermokarst processes in the village of Churapcha in the Republic of Sakha (Yakutia), Russia September 5, 2021

Permafrost risk analysis workflow diagram

Greg Cocks @GregCocks@techhub.social

After Millennia As CO₂ Sink, More Than One-Third Of Arctic-Boreal Region Is Now A Source
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https://phys.org/news/2025-01-millennia-arctic-boreal-region-source.html <-- shared technical article
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https://doi.org/10.1038/s41558-024-02234-5 <-- shared paper
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#GIS #spatial #mapping #arctic #boreal #carbonsink #carbonsource #permafrost #melting #tundra #wetlands #forest #co2 #CO₂ #spatialanalysis #climatechange #fire #wildfire #carbon #carbonfootprint #carbondioxide #sampling #monitoring #model #modeling #spatialanalysis #spatiotemporal

photo - rhododendrons and wildflowers along a tundra lake in West Greenland

Map of Arctic-boreal zone study area depicting boreal forests, tundra, and permafrost region

maps - Spatial variability in Arctic–boreal CO2 fluxes

map - Average terrestrial CO2 balance from 2001–2020 based on a synthesis of field measurements and machine learning models

Greg Cocks @GregCocks@techhub.social

Over 3,000 Billion Litres Of Water Flooded Out Of A Glacial Lake In Just 18 Days [GLOF]
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https://www.iflscience.com/over-3000-billion-liters-of-water-flooded-out-of-a-glacial-lake-in-just-18-days-77263 <-- shared technical article
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https://nbi.ku.dk/english/news/news24/one-of-worlds-largest-glacier-floods-triggered-in-greenland/ <-- shared technical article
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#GIS #spatial #mapping #remotesensing #earthobservation #CatalinaLake #Greenland #glaciallakeoutburstflood #GLOF #EastGreenland #glacial #cryosphere #climatechange #melting #warming #meltwater #flood #flooding #Sentinel2 #risk #hazard #outflow

aerial photo - oblique - Catalina Lake, East Greenland, 2013 (NASA)

image - after - 20241015

satellite image - Sentinel 2 - 20241008 showing a sediment plume in the sea

image - before - 20240812

Greg Cocks @GregCocks@techhub.social

Permafrost - A Central Hub For Permafrost Information In Canada.
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https://geo.ca/communities/permafrost/?hsid=f464bd17-b45b-4beb-ad6b-1f55f6ccd489
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“As #GeographyAwarenessWeek approaches, it's the perfect time to highlight Canada’s permafrost - a crucial component of our northern ecosystems that plays a key role in shaping both our environment and infrastructure.
[You are] invite[d] to discover GEO.ca’s new Permafrost Community space, a go-to resource for anyone interested in learning more about permafrost thawing and its impacts across Canada…”
#Permafrost #GeoDiscovery #ClimateChange #GIS #spatial #mapping #arctic #spatialanalysis #spatiotemporal #geography #canada #spatiotemporal #northern #ecosystems #infrastructure #change #damage #carbon #carbonstorage #environment #foodweb #melt #melting

map - permafrost and carbon stored in peat, Canada

photo - helicopter landed on melting permafrost, Canada

photo - researchers measuring thawing permafrost on Herschel Island, a few kilometres off the Yukon coast. Dramatic changes to landscapes in the North could be accelerated by the permafrost carbon feedback loop.

aerial image - The Mackenzie River system is Canada’s largest watershed, and the tenth largest water basin in the world. Parts of the watershed sit atop permafrost, making it vulnerable to climate change. Approximately 40 per cent of Canada’s landmass overlays permafrost.

Continued thread

Nonilex @Nonilex@masto.ai

As a result, #SeaIce is #melting faster & more dramatically in a season. Trees & plants are growing where they haven’t in recent decades.
 #Wildlife is also encountering #diseases not previously seen in their lifetimes.

Stories have surfaced of #animals fighting off new diseases, & sometimes losing that fight. The #BirdFlu infected & killed a #PolarBear & #walruses in the #Arctic for the first time.

#Climate #ClimateCrisis #Ecosystems

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