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Mechanistic Drivers of Reemergence of Anthropogenic Carbon in the Equatorial Pacific

Author(s): Zhai, Ping; Rodgers, Keith B; Griffies, Stephen M; Slater, Richard D; Iudicone, Daniele; et al

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Abstract: Relatively rapid reemergence of anthropogenic carbon (Cant) in the Equatorial Pacific is of potential importance for its impact on the carbonate buffering capacity of surface seawater and thereby impeding the ocean's ability to further absorb Cant from the atmosphere. We explore the mechanisms sustaining Cant reemergence (upwelling) from the thermocline to surface layers by applying water mass transformation diagnostics to a global ocean/sea ice/biogeochemistry model. We find that the upwelling rate of Cant (0.4 PgC yr−1) from the thermocline to the surface layer is almost twice as large as air‐sea Cant fluxes (0.203 PgC yr−1). The upwelling of Cant from the thermocline to the surface layer can be understood as a two‐step process: The first being due to diapycnal diffusive transformation fluxes and the second due to surface buoyancy fluxes. We also find that this reemergence of Cant decreases dramatically during the 1982/1983 and 1997/1998 El Niño events.
Publication Date: 12-Sep-2017
Citation: Zhai, Ping, Keith B. Rodgers, Stephen M. Griffies, Richard D. Slater, Daniele Iudicone, Jorge L. Sarmiento, and Laure Resplandy. "Mechanistic drivers of reemergence of anthropogenic carbon in the equatorial Pacific." Geophysical Research Letters 44, no. 18 (2017): 9433-9439. doi: 10.1002/2017GL073758.
DOI: doi:10.1002/2017GL073758
ISSN: 0094-8276
EISSN: 1944-8007
Pages: 9433 - 9439
Type of Material: Journal Article
Journal/Proceeding Title: Geophysical Research Letters
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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