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#weathering

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Public *
💧🌏 Greg Cocks

Edge Of Mars’ Great Dichotomy Eroded Back By Hundreds Of Kilometres
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arstechnica.com/science/2025/0 <-- shared technical article
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dx.doi.org/10.1038/s41561-024- <-- shared paper
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#GIS #spatial #mapping #planet #Mars #remotesensing #imagery #landsurface #geology #topography #astrogeology #elevation #morphology #martian #geography #marsdichotomy #plateau #lowlands #model #3dmodel #basin #highlands #shoreline #ocean #crust #structuralgeology #chemostratigraphy #morphostratigraphy #geomorphometry #geomorphology #water #hydrology #CaSSIS #HiRISE #stratigraphy #strata #MOLA #laser #LiDAR #MawrthVallis #crater #mound #profile #crosssection #geochemistry #mineralogy #CRISM #CTX #HRSC #DTM #erosion #weathering #spatialanalysis #spatiotemporal

images - Morphological similarities between the stratigraphy in the mounds and the Mawrth Vallis plateau region
3D model, map, images and charts - Chemostratigraphy and morphostratigraphy of a well-exposed mound
3D map and cross section - Three-dimensional view of study area with stacked elevation profiles
image/map - the topography of Mars by the Mars Orbital Laser Altimeter (MOLA)
Public *
💧🌏 Greg Cocks

Atop The Oregon Cascades, [Research] Team Finds A Huge Buried Aquifer
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eurekalert.org/news-releases/1 <-- shared technical article
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doi.org/10.1073/pnas.241515512 <-- shared paper
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usgs.gov/centers/oregon-water- <-- shared USGS technical article, 2011, ‘McKenzie River Source Water Study’
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youtu.be/6R8e5HwGMwU?si=sniW4b <-- shared media video overview
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#GIS #spatial #mapping #model #modeling #water #hydrology #Oregon #Cascades #CascadeMountains #PNW #PacificNorthwest #volcanic #rocks #aquifer #waterresources #watermanagement #climatechange #snowpack #drought #spatialanalysis #CriticalZone #geohazards #geology #engineeringgeology #landscapes #weathering #bedrock #holocene #groundwater #structuralgeology #orogeny #remotesensing #geophysics #sampling #drilling #porosity #permability #tomography #lava #spring #seep #breccia #discharge #streams #runoff #precipitation #climate #rainfall #recharge

photo - Scientists examine a large-volume spring in young volcanic rocks of the McKenzie River watershed on the west side of the Cascade topographic crest that was monitored as part of this study. Credit: Benjamin Nash
map, photo and charts - (A) Electrical resistivity tomography of Olallie North Spring, which emerges along a flow contact of _25 ka Scott Mountain lava flows. Lateral variations correspond to spring discharge points along the lava flow basal breccia such as depicted in (B) (photo: Benjamin Nash). (C) Mean of total yearly range in discharge _Q divided by mean annual flow Qavg versus average upstream age for springs and streams. The horizontal line defines “spring-” versus “runoff-” dominated. (D) SD of yearly average summer discharge (June–September), normalized by Qavg, with CZ state shift labeled.
maps and chart - (A) Distribution of geothermal drill holes. Thin black circles’ radii scale with total logged length, and colors indicate the fraction of length for which dT=dz < 20_C/km (implying downward flux of meteoric water). Red circles are the fraction with inverted gradients (dT=dz < 0_C/km). The purple contour indicates bedrock ages <2 Ma, while stars mark Holocene age phreatomagmatic eruption vents. (B) Two example temperature-depth logs from deep wells in old and young bedrock. (C) Porosity (blue) and resistivity (orange) in the Santiam Pass drill hole SP 77-24. Dashed lines indicate low porosity at high measured resistivity. (D) Chemical weathering tracked by oxidation state of iron in the Santiam Pass drill hole. The green box indicates range of Quaternary High Cascades lavas (SI Appendix), indicating that much of the SP 77-24 hole has been oxidized.
maps and cross section - Oregon Cascades study site. (A) Topography, rivers (from USGS blue lines), stream gauges, lakes, and faults. Olallie North Spring (ONS) and HJ Andrews Experimental Forest (HJA) are labeled. (B) Surface bedrock ages (18), geothermal drill holes, and Quaternary volcanic vents (19). Labeled vents exhibited Holocene phreatomagmatic activity: Sand Mountain volcanic field (SMF), Blue Lake Crater (BLC), Twin Craters (TC). Gray areas are mapped as “Sedimentary deposits and rocks” in ref. 18. (C) Cross-section of swath topography and surface bedrock ages (N-S average of _4 km from Santiam Pass, pink box in panel A), with subsurface structures based on published geologic maps (SI Appendix). The proposed Critical Zone (CZ) state shift and physiographic “Western” and “High” Cascade provinces are labeled. (D) Temperature gradient versus depth in drill holes from panel (C). Near-isothermal or inverted temperature gradients define the “rain curtain.”
Public
Or M. Bialik

Sometimes, we think we understand something, and then we get more details.
The thought was that mountain building (orogenesis) is a major #CO2 sink (#CarbonCapture) because of #weathering and related reactions to the atmosphere. However, this # #research claims that the metamorphosis of rocks underneath the orogen releases a similar amount of CO2 as that sequestered by weathering.
sciencedirect.com/science/arti

Public
Tabletop Sentinel

AmmoMig has cooked up a storm for WWII modelling nerds this month, and it's not just the usual suspects. Besides an array of paints and powders that’ll make the Luftwaffe blush, they've thrown in a 180-page guide to German armour and even handy tools for precision glueing. And yes, pillows for the serious hobbyist - because nothing screams 'dedicated modeler' quite like dozing off mid-war scene. tinyurl.com/34vc5csf

The image depicts a small bottle of Mig AMMO's new Fast Ultraliquid cyanocrylate glue. The bottle has a white triangular cap and a brown label with the word "FAST" in bold. The label also includes additional text and a small logo. To the left of the bottle is the square Mig AMMO logo, which is yellow with a black border and features three vertical black lines inside the square. The background is plain white.
Public
Tabletop Sentinel

AmmoMig has cooked up a storm for WWII modelling nerds this month, and it's not just the usual suspects. Besides an array of paints and powders that’ll make the Luftwaffe blush, they've thrown in a 180-page guide to German armour and even handy tools for precision glueing. And yes, pillows for the serious hobbyist - because nothing screams 'dedicated modeler' quite like dozing off mid-war scene. tinyurl.com/34vc5csf

The image depicts a small bottle of Mig AMMO's new Fast Ultraliquid cyanocrylate glue. The bottle has a white triangular cap and a brown label with the word "FAST" in bold. The label also includes additional text and a small logo. To the left of the bottle is the square Mig AMMO logo, which is yellow with a black border and features three vertical black lines inside the square. The background is plain white.
Public
Chuck Darwin

As the Late Permian gave way to the Triassic, Earth stayed warm for an unusually long time
—around 5 million years
—according to oxygen isotopes preserved in prehistoric fish teeth and other fossils.

A new study published in the Proceedings of the National Academy of Sciences of the United States of America suggests that the reason lies in the Early Triassic’s near-lifeless oceans and a process called #reverse #weathering, or the formation of #marine #clay.

eos.org/articles/clays-may-hav

Eos · Clays May Have Slowed Earth’s Recovery After the Great DyingBy Kate Evans
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💧🌏 Greg Cocks

Alaska's Rusting Waters - Pristine Rivers And Streams Turning Orange | Metal Mobilization From Thawing Permafrost To Aquatic Ecosystems Is Driving Rusting Of Arctic Streams
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phys.org/news/2024-05-alaska-r <-- shared technical article
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doi.org/10.1038/s43247-024-014 <-- shared paper
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#GIS #spatial #mapping #remotesensing #satellite #imagery #Landsat #earthobservation #Alaska #water #hydrology #Arctic #permafrost #melting #thawing #climatechange #waterchemistry #ecosystem #upland #waterquality #humanimpacts #discolourisation #BrooksRange #aquatic #foodweb #drinkingwater #watersecurity #subsistence #fishing #iron #Fe #rust #minerals #mineralogy #sediment #soil #sampling #pH #sulfides #weathering #erosion #drainage #streamflow #iron #zinc #nickel #copper #cadmium #waterresources #ecosystems

map - orange stream observations across the Brooks Range in northern Alaska
photo - aerial view of the Kutuk River in Alaska's Gates of the Arctic National Park that looks like orange paint spilling into the clear blue water.
photos, maps & charts - Time-series analysis of three discolored streams in northwest Alaska using Landsat
schematic - Conceptual models of hypothesized processes contributing to the discoloration of Arctic streams in Alaska’s Brooks Range
Public
David Hembrow

This afternoon's bike trip was a 37 km round trip in one hour and ten minutes to collect a 20 kg sack of "greensand" olivine for the garden.

I think it's a good example of the efficiency of velomobiles: how they make human power even more effective than when riding a normal bike. Even on the return journey with a headwind and loaded with the sack of sand, it was easy to keep the speed above 35 km/h.

Being able to stow a lot of things inside the aerodynamic form of the bike helps a lot with efficiency. You feel extra weight when accelerating, not so much once you get going.

And why the olivine ? I calculated a few weeks back that in the worst case this last winter our heating could have emitted 105 kg of CO2. This sack is enough to absorb about a fifth of that amount from the atmosphere.

Each time we plant things indoors or in our garden we add a bit of olivine.

Once humanity (especially those of us in the highly emitting richer countries) has reduced emissions by a lot, it's possible to make a bit of a dent by using a product like this. But there's no chance of compensating for ever larger emissions by trying to mine ever larger amounts of olivine.

Mango velomobile next to our front garden with a sack of olivine resting against it. Visible behind the velomobile are a water butt, an apple tree, a plum tree, some rhubarb, and quite a lot of dandilions on the bit we let get wild each spring because it's good for the insects. Hopefully this doesn't annoy our neighbours too much.
#recumbent#velomobile#regel17
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