Carbon pump dynamics and limited organic carbon burial during OAE1a


"Oceanic Anoxic Events (OAEs) are conspicuous intervals in the geologic record that are associated with the deposition of organic carbon (OC)-rich marine sediment, linked to extreme biogeochemical perturbations, and characterized by widespread ocean deoxygenation. Mechanistic links between the marine biological carbon pump (BCP), redox conditions, and organic carbon burial during OAEs, however, remain poorly constrained. In this work we reconstructed the BCP in the western Tethys Ocean across OAE1a (~120 Mya) using sediment geochemistry and OC mass accumulation rates (OCAcc). [...]".


Source: Wiley Online Library
Authors: Kohen W. Bauer et al.

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Changes in phytoplankton concentration now drive increased Arctic Ocean primary production


"Historically, sea ice loss in the Arctic Ocean has promoted increased phytoplankton primary production because of the greater open water area and a longer growing season. However, debate remains about whether primary production will continue to rise should sea ice decline further. Using an ocean color algorithm parameterized for the Arctic Ocean, we show that primary production increased by 57% between 1998 and 2018. Surprisingly, whereas increases were due to widespread sea ice loss during the first decade[...]"


Source: American Association For The Advancement Of Science 
Authors: K. M. Lewis et al.
DOI: 10.1126/science.aay8380 

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Sinking flux of particulate organic matter in the oceans: Sensitivity to particle characteristics


"The sinking of organic particles produced in the upper sunlit layers of the ocean forms an important limb of the oceanic biological pump, which impacts the sequestration of carbon and resupply of nutrients in the mesopelagic ocean. Particles raining out from the upper ocean undergo remineralization by bacteria colonized on their surface and interior, leading to an attenuation in the sinking flux of organic matter with depth. [...]"

Source: Scientific Reports
Authors: Melissa M. Omand et al.
DOI: 10.1038/s41598-020-60424-5

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Understanding the remote influences of ocean weather on the episodic pulses of particulate organic carbon flux


"The biological carbon pump has been estimated to export ∼5–15 Gt C yr−1 into the deep ocean, and forms the principal deep-sea food resource. Irregular, intense pulses of particulate organic carbon (POC) have been found to make up about one-third of the overall POC fluxes at a long-term deep-sea research station influenced by coastal upwelling of the California Current, Station M (34°50′N, 123° W, 4000 m depth). However, the drivers of these pulses have been challenging to quantify. [...]"

Source: Deep Sea Research Part II: Topical Studies in Oceanography
Authors: Henry A. Ruhl et al.
DOI: 10.1016/j.dsr2.2020.104741

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