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Biological carbon pump estimate based on multidecadal hydrographic data

The transfer of photosynthetically produced organic carbon from surface to mesopelagic waters draws carbon dioxide from the atmosphere1. However, current observation-based estimates disagree on the strength of this biological carbon pump (BCP)2. Earth system models (ESMs) also exhibit a large spread of BCP estimates, indicating limited representations of the known carbon export pathways3. Here we use several decades of hydrographic observations to produce a top-down estimate of the strength of the BCP with an inverse biogeochemical model that implicitly accounts for all known export pathways. Our estimate of total organic carbon (TOC) export at 73.4 m (model euphotic zone depth) is 15.00 ± 1.12 Pg C year−1, with only two-thirds reaching 100 m depth owing to rapid remineralization of organic matter in the upper water column. Partitioned by sequestration time below the euphotic zone, τ, the globally integrated organic carbon produ ....

Arabian Sea , India General , Atlantic Ocean , Pacific Ocean , Coupled Model Intercomparison Project Phase , Southern Ocean , North Pacific , Extended Data , North Atlantic , North Atlantic Ocean , South Atlantic ,

To Meet Climate Goals, Protect the Tongass and Chugach Forests

The two largest U.S. national forests, both in Alaska, have low wildfire risk and provide crucial forest carbon stocks and biodiversity benefits. ....

United States , Rachel Fritts , Chugach National Forests , Coupled Model Intercomparison Project Phase ,

Enhanced Cyclone Simulation Urged for Future Climate Models

Enhanced Cyclone Simulation Urged for Future Climate Models
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Environmental Research Letters On Oct , Shanghai Typhoon Institute Of China Meteorological Administration , North Pacific , Environmental Research Letters , Shanghai Typhoon Institute , China Meteorological Administration , Atmospheric Physics , Chinese Academy , Coupled Model Intercomparison Project Phase ,