#weathering — Public Fediverse posts on home.social

💧🌏 Greg Cocks @[email protected] · 2026-09-04 · 02:28 UTC

To Predict Tree Death, Scientists Tapped Gamma Rays To Peer Underground
(Airborne radiation sensors could help forecast and prevent drought-driven tree mortality_
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https://www.science.org/content/article/predict-tree-death-scientists-tapped-gamma-rays-peer-underground <-- shared technical article
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https://doi.org/10.1029/2026GL122182 <-- shared paper
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H/T @hannah Richter
“Over an 18-month period starting in 2023, the dense forests of Western Australia [WA] experienced a record-setting drought. Jarrah trees towering 35 metres high died off in patchy brown splotches, turning 400 square kilometres - 3% of the forest - into brittle, fire-prone stands. The event led researchers to wonder whether there was a better way to predict where such die-offs might occur both there and in other forests, a problem that has long been tricky to solve because important factors such as soil depth are hidden underground…
Now, those same researchers have unveiled a surprising new tool for predicting tree mortality: gamma rays [link above.] Resulting from the natural decay of the potassium-40 isotope from granite-rich bedrock, the radiation acts as a proxy for soil depth, which in turn signals how much water a tree can access during drought. The new method could be applied to other highly weathered soils, which cover one-third of Earth’s ice-free land...”
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"... PLAIN LANGUAGE SUMMARY: During a record-breaking drought and heat event in 2023–2024, forests in southwestern Australia experienced widespread, patchy die-off. While we know that extreme weather triggers these events, it is often a hidden factor, the thickness of soil and the depth to underlying bedrock, that determines which trees live or die. Trees growing in shallow soil over solid rock are highly vulnerable due to limited water storage. Here, [they] show how to map these hidden zones from the air using gamma rays that are naturally emitted by potassium in the ground. Like southwestern Australia, many parts of the world have highly weathered soils where potassium has been washed out of the upper layers of soil. However, [they] showed that higher potassium areas signal that potassium-rich bedrock is closer to the surface and this is sensitive for tens of meters. By comparing gamma ray maps with ground-based geophysical surveys and satellite data, [they] showed that these potassium hotspots accurately predict where forests are most likely to experience die-off during a drought. These types of soils cover about one-third of the Earth's land, so the method provides a powerful new tool for managers to identify and protect vulnerable forests from future, hotter droughts…”
#GIS #spatial #mapping #spatialanalysis #spatiotemporal #Australia #WesternAustralia #WA #forests #vegetation #bush #jarrah #karri #drought #heat #extremedrought #extremeweather #climatechange #water #waterresources #dieoff #soil #weathering #erosion #moisture #nutrients #airborne #gammarays #GRS #granite #gneiss #bedrock #geology #potassium40 #potassium #K #remotesensing #earthobservation #groundwater #interstitial #subsurface #waterstorage #electricalresistivitytomography

#gis #spatial #mapping #spatialanalysis #spatiotemporal #australia

ISD @[email protected] · 2026-02-16 · 19:11 UTC

Hummel pin washed, cleaned up, then chipped and after that again dirtified wit different brown oils like fresh and old rust and just "mud", and all gently blended around. So much fun.

When all that had dried up, I matt varnished the whole model. Tomorrow I'll use some mud pigments and a graphite pen for final highligts and call the Bumblebee done.

#ScaleModeling #WIP #weathering #oilPaints

#scalemodeling #wip #weathering #oilpaints

💧🌏 Greg Cocks @[email protected] · 2026-02-05 · 06:35 UTC

Climatic And Anthropogenic Controls On Late Holocene Sediment Transport To The Gulf Of Mexico By The Mississippi River
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https://doi.org/10.1016/j.earscirev.2026.105401 <-- shared paper
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#water #hydrology #hydrography #humanimpacts #human #settlement #anthropogenic #levees #engineering #spatialanalysis #spatialtemporal #erosion #weathering #Mississippi #River #Sediment #Provenance #Zircon #grainsize #alluvial #alluvium #hydrogeomorphology #headwater #coast #coastal #delta #geology #Holocene #geochemistry #Sr #Nd #isotope #Strontium #Neodymium #detrital #climate #GulfofMexico

#water #hydrology #hydrography #humanimpacts #human #settlement

Stefan F. Wirth @[email protected] · 2025-12-05 · 15:54 UTC

#Chitonida (#Mollusca) exist since the #Cambrian. Bodies are covered with #calcareous #plates, flexibly connected. Most feed on vegetation cover. The #CambrianExplosion made based i.a. on #oxygen significant leaps in #animalevolution. Y. Zhang et al. (2025) assume a change in Earth's orbit altering #solarradiation, leading to land #weathering and #nutrients flow to the sea. Algae thrived and produced much oxygen.
© #StefanFWirth 2025

Ref
https://doi.org/10.1029/2025GL118689

#Pics
#AIassisted, © S.F.Wirth

#chitonida #mollusca #cambrian #calcareous #plates #cambrianexplosion

Stefan F. Wirth @[email protected] · 2025-12-05 · 15:54 UTC

#Chitonida (#Mollusca) exist since the #Cambrian. Bodies are covered with #calcareous #plates, flexibly connected. Most feed on vegetation cover. The #CambrianExplosion made based i.a. on #oxygen significant leaps in #animalevolution. Y. Zhang et al. (2025) assume a change in Earth's orbit altering #solarradiation, leading to land #weathering and #nutrients flow to the sea. Algae thrived and produced much oxygen.
© #StefanFWirth 2025

Ref
https://doi.org/10.1029/2025GL118689

#Pics
#AIassisted, © S.F.Wirth

#chitonida #mollusca #cambrian #calcareous #plates #cambrianexplosion

Stefan F. Wirth @[email protected] · 2025-12-05 · 15:54 UTC

#Chitonida (#Mollusca) exist since the #Cambrian. Bodies are covered with #calcareous #plates, flexibly connected. Most feed on vegetation cover. The #CambrianExplosion made based i.a. on #oxygen significant leaps in #animalevolution. Y. Zhang et al. (2025) assume a change in Earth's orbit altering #solarradiation, leading to land #weathering and #nutrients flow to the sea. Algae thrived and produced much oxygen.
© #StefanFWirth 2025

Ref
https://doi.org/10.1029/2025GL118689

#Pics
#AIassisted, © S.F.Wirth

#chitonida #mollusca #cambrian #calcareous #plates #cambrianexplosion

Stefan F. Wirth @[email protected] · 2025-12-05 · 15:54 UTC

#Chitonida (#Mollusca) exist since the #Cambrian. Bodies are covered with #calcareous #plates, flexibly connected. Most feed on vegetation cover. The #CambrianExplosion made based i.a. on #oxygen significant leaps in #animalevolution. Y. Zhang et al. (2025) assume a change in Earth's orbit altering #solarradiation, leading to land #weathering and #nutrients flow to the sea. Algae thrived and produced much oxygen.
© #StefanFWirth 2025

Ref
https://doi.org/10.1029/2025GL118689

#Pics
#AIassisted, © S.F.Wirth

#aiassisted #pics #stefanfwirth #nutrients #weathering #solarradiation

Stefan F. Wirth @[email protected] · 2025-12-05 · 15:54 UTC

#Chitonida (#Mollusca) exist since the #Cambrian. Bodies are covered with #calcareous #plates, flexibly connected. Most feed on vegetation cover. The #CambrianExplosion made based i.a. on #oxygen significant leaps in #animalevolution. Y. Zhang et al. (2025) assume a change in Earth's orbit altering #solarradiation, leading to land #weathering and #nutrients flow to the sea. Algae thrived and produced much oxygen.
© #StefanFWirth 2025

Ref
https://doi.org/10.1029/2025GL118689

#Pics
#AIassisted, © S.F.Wirth

#chitonida #mollusca #cambrian #calcareous #plates #cambrianexplosion

ISD @[email protected] · 2025-03-18 · 11:45 UTC

And then one of the cats knocked the damn thing to the floor. Nose wheel broke and the repair looks like it was AI-generated 😅

I applied a yellow-grey-buff dot filtering on the top, used some Industrial Earth on the bottom and satin varnished the thing. Too shiny, will do a matt one later. And after that I'll drybrush some black on the Vulcan port, maybe the vents too.

#ScaleModeling #WIP #OilPaints #weathering #Decepticon #Seeker

#scalemodeling #wip #oilpaints #weathering #decepticon #seeker

ISD @[email protected] · 2025-03-15 · 09:13 UTC

Instead of a finely controlled and elegant pin wash I covered the whole F-15E model in a dynamic thinness wash of Abteilung's Sepia. After a bit of time I cleaned it mostly up. There's still more to do, and I'll use some dot filtering and/or buff later on some bits, and a bit of Industrial Earth on the underside. I think 😄

The drop tank gluing sucks badly, and the left landing gear came off. This fiddliness aggravates me to no end.

#WIP #ScaleModeling #OilPaints #weathering #Decepticon #Seeker