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A New Metric of the Biological Carbon Pump: Number of Pump Passages and Its Control on Atmospheric pCO2

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Title
A New Metric of the Biological Carbon Pump: Number of Pump Passages and Its Control on Atmospheric pCO2
Author(s)
Holzer, Mark; Eun Young Kwon; Pasquier, Benoit
Subject
PARTICULATE ORGANIC-MATTER, ; GLOBAL OCEAN, ; TRANSPORT, ; AIR, ; FLUXES, ; EXPORT, ; CO2, ; VARIABILITY, ; SATELLITE, ; PHOSPHATE
Publication Date
2021-06
Journal
GLOBAL BIOGEOCHEMICAL CYCLES, v.35, no.6
Publisher
Blackwell Publishing Ltd
Abstract
© 2021. American Geophysical Union. All Rights Reserved.We develop novel locally defined diagnostics for the efficiency of the ocean's biological pump by tracing carbon throughout its lifetime in the ocean from gas injection to outgassing and counting the number of passages through the soft-tissue and carbonate pumps. These diagnostics reveal that the biological pump's key controls on atmospheric pCO2 are the mean number of lifetime pump passages per dissolved inorganic carbon (DIC) molecule at the surface and the mean aphotic sequestration time of regenerated DIC. We apply our diagnostics to an observationally constrained carbon-cycle model that features spatially varying stoichiometric ratios and is embedded in a data-assimilated global ocean circulation. We find that for the present-day ocean an average of 44 ± 4% of DIC in a given water parcel makes at least one lifetime passage through the soft tissue pump, and about 4% makes at least one passage through the carbonate pump. The global mean number of lifetime pump passages per molecule, including the fraction with zero passages, is (Formula presented.) and (Formula presented.) for the soft-tissue and carbonate pumps. Using idealized perturbations to sweep out a sequence of states ranging from zero biological activity ((Formula presented.) ppmv) to complete surface nutrient depletion ((Formula presented.) ppmv), we find that fractional changes in (Formula presented.) are dominated by fractional changes in the number of soft-tissue pump passages. At complete surface nutrient depletion, the mean fraction of DIC that has at least one lifetime passage through the soft-tissue pump increases to 69 ± 5% with (Formula presented.).
URI
https://pr.ibs.re.kr/handle/8788114/9936
DOI
10.1029/2020GB006863
ISSN
0886-6236
Appears in Collections:
Center for Climate Physics(기후물리 연구단) > 1. Journal Papers (저널논문)
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