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Geochemistry

Phytoplankton bloom in the Tasman Sea captured by the MODIS instrument on the Aqua satellite on 21 November 2017.
Posted inFeatures

Interpreting Mosaics of Ocean Biogeochemistry

by Andrea Fassbender, A. Bourbonnais, S. Clayton, P. Gaube, M. Omand, P. J. S. Franks, M. A. Altabet and D. J. McGillicuddy Jr. 17 December 201829 April 2022

Advances in technology and modeling capabilities are driving a surge in progress in our understanding of how ocean ecosystems mix and mingle on medium to small scales.

3D rendering of an O. megalodon shark
Posted inNews

Extinct Megatoothed Shark May Have Been Warm-Blooded

by Kimberly M. S. Cartier 11 December 201826 January 2023

Preliminary results from a recent study may begin to shed light on why megalodons died out before the most recent ice age.

Researchers look at metals in the millimeter-thick sea surface microlayer to better understand how the layer can affect ocean health
Posted inResearch Spotlights

Why Trace Metals Cling to the Ocean’s Skin

by E. Underwood 14 August 201825 August 2022

Metals within the millimeter-thick sea surface microlayer may impact ocean health and climate.

Fireworks of many colors.
Posted inGeoFIZZ

A Rock Guide to Fireworks

by Jenessa Duncombe 3 July 20187 March 2022

Before a firework was red, it was a strontium salt waiting for its moment.

Posted inEditors' Vox

Multiple Choices Exist for Changing Ocean Oxygen Concentrations

by P. Brewer 14 May 201827 January 2023

Widespread declines in ocean oxygen concentrations are now being reported with authors offering quite different explanations. Which ones are correct?

Researchers examine the chemical relationships between water, sediment, and organisms that thrive beneath riverbeds
Posted inResearch Spotlights

Life in the Hyporheic Zone

by S. Witman 23 April 201822 December 2021

Defining the chemical relationships between water, sediment, and organisms that thrive beneath riverbeds.

Marine mollusk shells record the magnitude of the radiocarbon marine reservoir effect in their habitat.
Posted inEditors' Vox

Radiocarbon in the Oceans

by E. Q. Alves 17 April 201827 January 2022

Offsets in radiocarbon concentration within the ocean or between the ocean and the atmosphere are particularly useful proxies for a variety of studies.

Posted inEditors' Highlights

Unraveling Hemispheric Ocean Nitrate Supply Pathways

by S. B. Moran 10 April 201827 September 2022

Subsurface measurements of nitrogen and oxygen isotope ratios in nitrate reveal a predominantly southern hemisphere supply of nitrate to the equatorial Pacific.

A rough, uncut diamond sitting in kimberlite rock.
Posted inNews

Diamond Impurities Reveal Water Deep Within the Mantle

by Kimberly M. S. Cartier 2 April 201823 December 2021

A high-pressure form of ice, trapped within diamonds forged in the lower mantle, suggests that aqueous fluids reside deeper in Earth than we knew.

Researchers examine mudstone in Mars’s Gale crater to unravel the history of liquid surface water
Posted inResearch Spotlights

History of Water on Mars’s Surface Is Longer Than We Thought

by Terri Cook 2 February 20183 January 2023

Curiosity’s two-step heating experiment of mudstone at Gale crater reveals minerals that formed in the presence of water less than 3 billion years ago.

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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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