Researchers study how oceans respire carbon, reexamining a critical part of the global carbon cycle.
Global Biogeochemical Cycles
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New Evidence Challenges Prevailing Views on Marine Carbon Flux
Small, slow-sinking organic particles may play a bigger role than previously thought in the transport of carbon below the surface ocean.
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New Baseline for Understanding Arctic Oxygen and Nutrient Fluxes
Significant spatial and temporal patterns emerge from the first pan-Arctic comparison of oxygen demand in marine sediments.
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Why Is There So Much Carbon Dioxide in Rivers?
Observations of carbon dioxide oversaturation in the freshwater of the world led scientists to study its underlying causes at more than 100 field locations across the nation.
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What’s the Average Methane Isotope Signature in Arctic Wetlands?
Aircraft measurements confirm that methane emissions from northern European wetlands exhibit a uniform regional carbon isotopic signature, despite considerable ground-level heterogeneity.
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High Arctic Emissions of a Strong Greenhouse Gas
Isotope data bring scientists one step closer to revealing the microbial processes behind nitrous oxide emission in the tundra.
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What Proportion of River Nutrients Reaches the Open Sea?
Results of the first geographically based estimates of river nutrient supply indicate that 75% of dissolved nitrogen and 80% of phosphorus reach the open ocean.
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Tiny Creatures Form Massive, Bright Ring Around Antarctica
Dense algae populations in the Great Calcite Belt could cause carbon dioxide release from the ocean into the atmosphere.
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Smoke Signals in the Amazon
Forest fires can occur naturally, but in the world's largest rain forest, fire can signal large-scale deforestation.
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Using Isotope Fingerprints to Solve a Methane Mystery
Atmospheric methane levels are rising, and isotopic ratios within the greenhouse gas suggest that the tropics may be to blame.