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Shallow calcium carbonate cycling in the North Pacific Ocean

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Date
17/05/2022
Author
Subhas, Adam V.
Dong, Sijia
Naviaux, John D.
Rollins, Nick E.
Ziveri, Patrizia
Gray, William
Rae, James W. B.
Liu, Xuewu
Byrne, Robert H.
Chen, Sang
Moore, Christopher
Martell-Bonet, Loraine
Steiner, Zvi
Antler, Gilad
Hu, Huanting
Lunstrum, Abby
Hou, Yi
Kemnitz, Nathaniel
Stutsman, Johnny
Pallacks, Sven
Dugenne, Mathilde
Quay, Paul D.
Berelson, William M.
Adkins, Jess F.
Keywords
Calcium carbonate
Dissolution
Carbon cycle
GB Physical geography
DAS
MCC
Metadata
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Abstract
The cycling of biologically produced calcium carbonate (CaCO3) in the ocean is a fundamental component of the global carbon cycle. Here, we present experimental determinations of in situ coccolith and foraminiferal calcite dissolution rates. We combine these rates with solid phase fluxes, dissolved tracers, and historical data to constrain the alkalinity cycle in the shallow North Pacific Ocean. The in situ dissolution rates of coccolithophores demonstrate a nonlinear dependence on saturation state. Dissolution rates of all three major calcifying groups (coccoliths, foraminifera, and aragonitic pteropods) are too slow to explain the patterns of both CaCO3 sinking flux and alkalinity regeneration in the North Pacific. Using a combination of dissolved and solid-phase tracers, we document a significant dissolution signal in seawater supersaturated for calcite. Driving CaCO3 dissolution with a combination of ambient saturation state and oxygen consumption simultaneously explains solid-phase CaCO3 flux profiles and patterns of alkalinity regeneration across the entire N. Pacific basin. We do not need to invoke the presence of carbonate phases with higher solubilities. Instead, biomineralization and metabolic processes intimately associate the acid (CO2) and the base (CaCO3) in the same particles, driving the coupled shallow remineralization of organic carbon and CaCO3. The linkage of these processes likely occurs through a combination of dissolution due to zooplankton grazing and microbial aerobic respiration within degrading particle aggregates. The coupling of these cycles acts as a major filter on the export of both organic and inorganic carbon to the deep ocean.
Citation
Subhas , A V , Dong , S , Naviaux , J D , Rollins , N E , Ziveri , P , Gray , W , Rae , J W B , Liu , X , Byrne , R H , Chen , S , Moore , C , Martell-Bonet , L , Steiner , Z , Antler , G , Hu , H , Lunstrum , A , Hou , Y , Kemnitz , N , Stutsman , J , Pallacks , S , Dugenne , M , Quay , P D , Berelson , W M & Adkins , J F 2022 , ' Shallow calcium carbonate cycling in the North Pacific Ocean ' , Global Biogeochemical Cycles , vol. 36 , no. 5 , e2022GB007388 . https://doi.org/10.1029/2022GB007388
Publication
Global Biogeochemical Cycles
Status
Peer reviewed
DOI
https://doi.org/10.1029/2022GB007388
ISSN
0886-6236
Type
Journal article
Rights
Copyright © 2022. American Geophysical Union. All Rights Reserved. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the final published version of the work, which was originally published at https://doi.org/10.1029/2022GB007388
Description
This work was funded by NSF OCE-1220301 to W.B., NSF OCE-1220600 to J.F.A., and startup funding for A.V.S.
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/26421

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