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Global Biogeochemical Cycles

A large swirling plankton bloom is seen in the Gulf of Alaska in this satellite image taken in June 2016
Posted inResearch Spotlights

A Promising Development for Detecting Ocean Productivity

by Terri Cook 3 November 2020

A comparison of primary productivity measurements across the North Pacific Ocean demonstrates the potential for using autonomous instruments to discern effects of climate change on the marine food web.

View of sea ice and part of the West Antarctic Peninsula from just offshore, with the bow of a research ship in the foreground
Posted inResearch Spotlights

How Long Does Iron Linger in the Ocean’s Upper Layers?

by Elizabeth Thompson 26 October 202028 January 2022

A new study refines our understanding of marine residence times of iron, which supports carbon-sequestering sea life, offering valuable data to inform biogeochemical models.

A bunch of jellyfish
Posted inResearch Spotlights

Jellies Transfer a Significant Amount of Carbon to the Deep Ocean

by Rachel Fritts 14 October 20205 January 2021

Jellyfish and sea salps aren’t getting the credit they deserve for their role in ocean carbon cycling, according to a new study.

Underwater bubbles rise toward the water surface
Posted inResearch Spotlights

Deep-Ocean Oxygen May Increase with Climate Change

by Kate Wheeling 17 September 2020

A millennial-scale ocean simulation indicates that oxygen gains in the deep ocean may offset oxygen losses in the upper water layer under a protracted climate change scenario.

Satellite imagery showing a dust cloud spanning the tropical North Atlantic on 20 June 2020
Posted inResearch Spotlights

Trans-Atlantic Dusts May Not Enrich Amazon as Much as Thought

by David Shultz 16 September 20202 November 2021

New research indicates that nutrient loads delivered to South American ecosystems by dust originating in Africa are far lower than suggested in previous studies.

Swirls of photosynthetic algae thrive in the Arabian Sea in February 2015.
Posted inResearch Spotlights

Anaerobic Activity Is a Big Contributor in Marine “Dead Zones”

by Sarah Stanley 17 January 202020 April 2022

Climate models that do not account for anaerobic microbial activity may underestimate future expansion of oxygen-depleted waters.

Close-up view of Sargassum natans, a seaweed commonly found in the Gulf of Mexico
Posted inResearch Spotlights

Sunlight Stimulates Brown Algae to Release Organic Carbon

by Sarah Stanley 2 December 201929 September 2021

Sargassum and other brown algae might be an underappreciated contributor of organic compounds called polyphenols to the open ocean.

An iceberg floats in the Southern Ocean.
Posted inResearch Spotlights

Ship-Based Measurements Overestimate Southern Ocean Carbon Sink

by Kate Wheeling 19 November 201929 September 2021

New research suggests that combining ship- and float-based observations provides a more accurate measure of how much carbon the Southern Ocean absorbs.

Researchers aboard a ship prepare to deploy an instrument to collect organic carbon in the ocean.
Posted inResearch Spotlights

Revealing the Ocean’s Rare but Prolific Carbon Export Events

by Sarah Stanley 3 September 2019

New findings suggest that rare events underlie a global inverse relationship between primary production of organic carbon in the upper ocean and the fraction that is exported to the deep sea.

Diagram of oxygen concentrations at 350 meters depth that shows the oxygen deficient zone, or shadow zone, in the eastern tropical North Pacific Ocean
Posted inResearch Spotlights

How the Ocean’s “Shadow Zone” Breathes

by E. Underwood 28 August 201922 December 2021

A new study uses Argo floats and an ocean circulation model to track the sources supplying pulses of oxygen to the deep North Pacific.

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