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sediments

Photo of an ocean with snow-capped mountains in the background.
Posted inEditors' Vox

Marine Sediments Reveal Past Climate Responses to CO2 Changes

by Sze Ling Ho and Erin McClymont 21 September 202320 September 2023

Climate records stored in marine sediments reveal different ice sheet and ocean responses to falling atmospheric CO2 concentrations from the warm Pliocene to the ice ages of the Pleistocene.

Photo of monitoring station in a river and map of study area with mass of bedload transport.
Posted inEditors' Highlights

Seismometers Listening at Rivers to Measure Sediment Transport

by Odin Marc 8 September 20236 September 2023

Bedload sediment, transported throughout an alpine catchment by a flood, was remotely tracked in detail by analyzing the ground vibrations recorded by a network of 24 seismic sensors.

Three soil blocks from a subice core taken in Camp Century, Greenland
Posted inNews

Greenland Was Much Greener 416,000 Years Ago

by Bill Morris 31 August 20238 September 2023

A fresh analysis of a historic ice core has revealed evidence of a much smaller ice cap.

Une image sous-marine montre un scientifique plongeur forant dans un grand dôme de corail
Posted inResearch Spotlights

La chimie du corail reflète l’expansion économique d’Asie du Sud-Est

by Rebecca Dzombak 22 August 202322 August 2023

Les sols en érosion en raison du développement économique ont transporté des sédiments en mer de Chine méridionale… et jusque dans le squelette corallien.

A snow-capped ridge with a sharp peak in the middle sits in front of a bright blue sky.
Posted inNews

A Massive Landslide Beheaded One of the World’s Highest Peaks

by Saima May Sidik 7 August 20237 August 2023

Annapurna IV toppled in a Himalayan landslide, and scientists finally figured out when and how it happened.

Air bubbles of different sizes rise through water.
Posted inNews

Scientists Discover a Way of Forming Suspended Layers of Sediment

Katherine Kornei, Science Writer by Katherine Kornei 1 August 20232 August 2023

Laboratory experiments suggest that underwater gas eruptions—due to the venting of gas hydrates, for example—could trigger the formation of layers of suspended sediment in the ocean.

Satellite view of part of Badwater Basin in Death Valley, Calif., showing meandering river channels running through the arid landscape
Posted inResearch Spotlights

Mud Could Have Made Meandering Rivers Long Before Plants Arrived

by Rebecca Dzombak 31 July 202331 July 2023

New evidence from 1.2-billion-year-old rocks suggests that single, sinuous channels could have formed in muddy floodplain sediments without the stabilizing help of vegetation.

Mosaic of four images of Comet 67P/Churyumov-Gerasimenko
Posted inEditors' Highlights

Dancing Dust on Comet 67P/Churyumov-Gerasimenko

by Naomi Murdoch and Laurent G. J. Montési 19 July 202318 July 2023

Cometary activity moves sediments over the surface of 67P/Churyumov-Gerasimenko, with long-term sinks near the poles of the comet.

Layers of stacked sedimentary rock of different thicknesses.
Posted inResearch Spotlights

Specious Timescales from Sedimentary Layers

by Saima May Sidik 12 July 202322 August 2023

Changing environments can dramatically change how quickly layers form in sedimentary rocks, leading to incorrect time estimates.

Graphs from the paper
Posted inEditors' Highlights

Using Bayesian Inference to Improve Sediment-Transport Models

by Terence O'Kane 6 July 20235 July 2023

A new Bayesian approach is used for the estimation and uncertainty quantification of unobservable parameters required to model tracer evolution in ocean sediment transport and tracer concentrations.

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