The findings are important because #methane is over 25 times more powerful than #CarbonDioxide as a #GreenhouseGas. #Arctic lakes are already major natural methane sources globally, but the processes that control how methane is produced and released from lake sediments have remained poorly understood—until now.

"We were surprised by how clearly the productivity of the ecosystem was linked to methane production," said Marie. "Our results show that warmer and wetter conditions increase biological productivity in Arctic lakes, which in turn drives methane #emissions from their sediments."

Most methane was produced within the top 10 cm of lake #sediment. In these shallow layers, the combination of fresh, organic-rich material and enhanced microbial activity creates ideal conditions for methane generation. The researchers calculated how much methane is likely to diffuse from the sediment into the overlying water and eventually into the atmosphere.

"The Arctic is changing rapidly, and we need to understand all the feedback involved," said Marie. "Our work suggests that increases in ecosystem productivity—something we could think of being positive—can also increase methane release and further accelerate warming."

https://phys.org/news/2025-07-arctic-lakes-methane.html

#ClimateScience
#Cryosphere
#Biogeoscience

**Dr. Or M. Bialik** @ombialik@mastodon.world · Jul 25

Jul 25

Dr. Or M. Bialik @ombialik@mastodon.world

#WeekendReading: Fernex et al., on the relation between the rate of #ammonia production in the #sediment and the amount and composition of organic matter coming from the overlaying #water column.
https://www.sciencedirect.com/science/article/pii/S027277149690075X

**Akkana Peck** @akkana@fosstodon.org · Jul 6

Jul 6

Akkana Peck @akkana@fosstodon.org

The Rio Grande through White Rock Canyon was an intense red-brown when I went by the Overlook a couple of days ago.

#SilentSunday #NewMexico #canyon

**Greg Cocks** @GregCocks@techhub.social · Jul 2

Jul 2

Greg Cocks @GregCocks@techhub.social

Reconstructing Ice-Margin Retreat Using Delta Morphostratigraphy
--
https://doi.org/10.1038/s41598-017-16763-x <-- shared paper
--
[an older paper, but fascinating - and well presented, especially the images/figures]
#GIS #spatial #mapping #icemargins #ice #delta #morphostratigraphy #paleogeography #icesheet #glacier #glacial #icesheet #glacialretreat #geology #landform #geomorphometry #geomorphology #LiDAR #engineeringgeology #remotesensing #icecontact #fluvial #water #hydrology #erosion #distal #glaciofluvial #paraglacial #sediment #deposition #quebec #canada #LaurentideIceSheet #retreat #delta #drainage #physiography #Québec

**Greg Cocks** @GregCocks@techhub.social · Jun 28

Jun 28

Greg Cocks @GregCocks@techhub.social

New Research Aims To Better Predict And Understand Cascading Land Surface Hazards
--
https://phys.org/news/2025-06-aims-cascading-surface-hazards.html <-- shared technical article
--
https://doi.org/10.1126/science.adp9559 <-- shared paper
--
#interconnected #geology #engineeringgeology #landcover #landsurface #GIS #spatial #mapping #landcover #hydrology #water #geomorphology # geomiorphmetry #risk #hazard #extremeweather #climatechange #cascading #cascadinghazards #debrisflow #wildfire #massmovement #landslides #flood #flooding #mudflow #susceptibility #chainreaction #spatialanalysis #spatiotemporal #prediction #management #planning #mitigation #multifactor #sediment #erosion #fluvial #earthquake #fault #faulting #hazardassessment #riskassessment #volcano #vulcanism #sealevelchange #cryosphere #ice #snow #GLOF #humanimpacts #urban #infrastructure #cost #economics #loss #damage #earthobservation #remotesensing #LiDAR #UAV

**Brad Rosenheim** @Brad_Rosenheim@climatejustice.social · Jun 20

Jun 20

Brad Rosenheim @Brad_Rosenheim@climatejustice.social

Imbrication: overlapping of sediment layers, fish scales, roof tiles, etc.

After our intense afternoon thunderstorms here in Florida, the streets abound with evidence of the deluge. Even in a land as flat as a pancake, leaves serve as the sediment imbricated by the intense rain. They have a surface area to mass ratio that is likely higher than even most clay particles, and thus they can behave this way even with relatively low slope and flow velocity. Imbrication happens in unidirectional currents and the grains organize with their upstream end higher than their downstream edge. So, in the geologic record they show us direction of ancient flows. Although formed by different processes, ripples in actual sediment can also show us direction and magnitude of ancient unidirectional flows.

All pictures taken from an alley in my neighborhood after a dousing thunderstorm.

https://en.m.wikipedia.org/wiki/Imbrication_(sedimentology)

#geology
#sediment
#sedimentology
#paleoclimatology