Relating estimates of CaCO3 production, export, and dissolution in the water column to measurements of CaCO3 rain into sediment traps and dissolution on the sea floor: A revised global carbonate budget

[1] The global CaCO3 budget is constrained by new estimates of standing stocks, fluxes through the water column, and dissolution in the water column and on the sea floor. Previous estimates of carbonate production and export are indistinguishable within a large range of values, 0.4 - 1.8 Gt PIC yr(-...

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Bibliographic Details
Published in:Global Biogeochemical Cycles
Main Authors: Berelson, WM, Balch, WM, Najjar, R, Feely, RA, Sabine, C, Lee, K
Other Authors: 환경연구소, 10056383
Format: Article in Journal/Newspaper
Language:English
Published: AMER GEOPHYSICAL UNION 2007
Subjects:
IN-SITU MEASUREMENTS
NORTH-ATLANTIC OCEAN
CALCIUM-CARBONATE
ORGANIC-CARBON
DEEP-SEA
EQUATORIAL PACIFIC
CONTINENTAL-MARGIN
INORGANIC CARBON
BENTHIC REMINERALIZATION
CHEMICAL LYSOCLINE
BIOGENIC PARTICLE FLUXES
ORGANIC-MATTER
Pacific
North Atlantic
Online Access:https://oasis.postech.ac.kr/handle/2014.oak/23503
https://doi.org/10.1029/2006GB002803
Description
Summary:[1] The global CaCO3 budget is constrained by new estimates of standing stocks, fluxes through the water column, and dissolution in the water column and on the sea floor. Previous estimates of carbonate production and export are indistinguishable within a large range of values, 0.4 - 1.8 Gt PIC yr(-1). Globally, excess alkalinity (TA*) and water mass tracers indicate dissolution of 1.0 Gt PIC yr(-1) between 200 and 1500 m, suggesting production and export must at least equal this amount. Most water column dissolution occurs at high latitudes, and alkalinity fluxes from outer shelf and upper slope sediments ( 100 - 1500 m) only support 5 - 10% of the TA* inventory. Below 2000 m, the sinking flux of PIC (0.6 Gt PIC yr(-1)) is consistent with the rate of sea floor dissolution (0.4 Gt PIC yr(-1)) plus burial (0.1 Gt PIC yr(-1)). This rain rate constrains the export value to > 1.6 Gt PIC yr(-1). Satellite-based estimates of standing stocks of CaCO3 indicate a decrease equatorward, which is opposite in trend to sediment trap fluxes. This observation may be explained by an equatorward decrease in sinking particle dissolution, systematic changes in PIC residence time with latitude, or satellite retrieval problems. Globally averaged euphotic zone standing stock (5.4 mmol m(-2)) and export estimates indicate PIC residence times of 5 - 18 days. X 1 1 77 81 scie scopus

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