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paleoclimatology & paleoceanography

Photo of a sample under a microscope
Posted inEditors' Vox

Rare and Revealing: Radiocarbon in Service of Paleoceanography

by Luke C. Skinner and Edouard Bard 7 February 20237 February 2023

While radiocarbon is best known as a dating tool, this rare isotope can also provide unique and wide-ranging insights into the cycling of carbon in the Earth system.

An artist’s rendering of Earth covered in ice
Posted inNews

How Animals May Have Conquered Snowball Earth

by Chris Baraniuk 9 January 202323 January 2023

We know there were animals during Earth’s chilliest era. The question is, What did they look like?

Posted inEditors' Highlights

Marine Molybdenum Loss During the Toarcian Ocean Anoxic Event

by Nicolas Gruber 7 January 202327 January 2023

The reconstructed loss of molybdenum during the Toarcian ocean anoxic event suggests deeply anoxic conditions during this time period allowing massive amounts of organic carbon being buried.

Posted inEditors' Highlights

A Drier or Wetter Future for Southwestern North America?

by Susan Trumbore 31 December 202226 January 2023

Bhattacharya et al. present evidence that expansion of the North American Monsoon explains a wetter southwest in the mid-Pliocene and suggest this mechanism can explain current monsoon variations.

Two people, flanked by two observers, stand among a field of boulders, guiding a large hand drill through the length of a white fossilized coral.
Posted inNews

El Niño Varies More Intensely Now Than in the Past Millennium

by Luis Melecio-Zambrano 15 December 20221 February 2023

Researchers found evidence for a strengthening El Niño in living and fossilized Galápagos corals.

Two graphs from the paper.
Posted inEditors' Highlights

Clumped 18O –18O in Ice Reveals Past Ozone and Wildfire

by Sarah Feakins 9 December 20227 December 2022

Reactive gases like ozone are hard to preserve, but clumped isotopes and models provide clues to past ozone and suggest a global increase in wildfire at megafaunal extinction.

Black-and-white satellite image showing a valley and paleolake on Mars’s surface
Posted inResearch Spotlights

Long-Lived Lakes Reveal a History of Water on Mars

by Sarah Derouin 6 December 20226 December 2022

High-resolution imagery of newly discovered paleolakes shows a period of consistent liquid water flow.

Diagram showing the formation and preservation of the iron sulfide greigite in bioturbidated anoxic sediments.
Posted inEditors' Highlights

New Mechanism for “Giant” Greigite Growth in Deep-Sea Sediments

by Agnes Kontny 2 December 202229 November 2022

Understanding greigite formation pathways in sediments is a prerequisite for assessing the marine iron-sulfur-carbon cycle and yield reliable near-syn-sedimentary paleomagnetic records.

A crew of about a dozen people handle a sediment core at their scientific drilling site at Chew Bahir in Ethiopia.
Posted inNews

Did a Chaotic Climate Drive Human Evolution?

by Elise Cutts 7 November 20221 February 2023

A new 620,000-year climate record from East Africa reveals dramatic swings between wet and dry conditions that may have influenced human evolution.

Australia’s remote Nullarbor Plain.
Posted inNews

A Mysterious Dome Reveals Clues to Australia’s Miocene History

by Nathaniel Scharping 17 October 202226 January 2023

The Nullarbor Plain has been relatively untouched by geological forces, leaving traces of the continent’s deep past.

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Features from AGU Journals

RESEARCH SPOTLIGHTS
JGR: Solid Earth
“New Tectonic Plate Model Could Improve Earthquake Risk Assessment”
By Morgan Rehnberg

EDITORS' HIGHLIGHTS
AGU Advances
“Eminently Complex – Climate Science and the 2021 Nobel Prize”
By Ana Barros

EDITORS' VOX
Perspectives of Earth and Space Scientists
“New Directions for Perspectives of Earth and Space Scientists”
By Michael Wysession


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