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• W2024193997 abstract "Recent independent lines of evidence suggest that the dissolution of calcium carbonate (CaCO 3 ) particles is substantial in the upper ocean above the calcite 100% saturation horizon. This shallow‐water dissolution of carbonate particles is in contrast with the current paradigm of the conservative nature of pelagic CaCO 3 at shallow water depths. Here we use more than 20,000 sets of carbon measurements in conjunction with CFC and 14 C data from the WOCE/JGOFS/OACES global CO 2 survey to estimate in situ dissolution rates of CaCO 3 in the Atlantic Ocean. A dissolution rate is estimated from changes in alkalinity as a parcel of water ages along an isopycnal surface. The in situ CaCO 3 dissolution increases rapidly at the aragonite 100% saturation horizon. Estimated dissolution rates north of 40 o N are generally higher than the rates to the south, which is partly attributable to the production of exported CaCO 3 being higher in the North Atlantic than in the South Atlantic. As more CaCO 3 particles move down the water column, more particles are available for in situ dissolution. The total water column CaCO 3 dissolution rate in the Atlantic Ocean is determined on an annual basis by integrating estimated dissolution rates throughout the entire water column and correcting for alkalinity input of approximately 5.6 × 10 12 mol C yr −1 from CaCO 3 ‐rich sediments. The resulting water column dissolution rate of CaCO 3 for the Atlantic Ocean is approximately 11.1 × 10 12 mol C yr −1 . This corresponds to about 31% of a recent estimate (35.8 × 10 12 mol C yr −1 ) of net CaCO 3 production by Lee [2001] for the same area. Our calculation using a large amount of high‐quality water column alkalinity data provides the first basin‐scale estimate of the CaCO 3 budget for the Atlantic Ocean." @default.
• W2024193997 created "2016-06-24" @default.
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• W2024193997 date "2003-10-09" @default.
• W2024193997 modified "2023-10-14" @default.
• W2024193997 title "Calcium carbonate budget in the Atlantic Ocean based on water column inorganic carbon chemistry" @default.
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• W2024193997 doi "https://doi.org/10.1029/2002gb002001" @default.
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