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Circulation, biogeochemistry and carbon cycling in ocean margins
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Northwest Atlantic coastal acidification under climate change
P-M1-18-S
Yuan-Yuan Xu* , University of Delaware
Wei-Jun Cai, University of Delaware
Baoshan Chen, University of Delaware
Presenter Email: yyx@udel.edu |
| Coastal acidification is a complex problem due to multiple interactions of the coastal water with the land, the open ocean, and the atmosphere. It also affects calcifying species and threatens the coastal ecosystems. Based on five cruise observations since 1994, we found the on-going acidification in the South Atlantic Bight (SAB), but the acidification signal is concealed in the Mid-Atlantic Bight (MAB). To extend the temporal coverage, we use Surface Ocean CO2 Atlas fugacity of CO2 (fCO2) data product to develop empirical equations for DIC estimation and validate the empirical equations using mooring data. Then we reconstruct the aragonite saturation state (Warag) time series from 1958 to 2017 using DIC and salinity-derived TA. Furthermore, we predict future DIC and Warag variations for the MAB and the SAB up to 2100. Over a long period (decades and longer), we observe DIC increase and Warag decrease in both the MAB and the SAB. However, the acidification signal is dampened in the MAB because of temperature increase and is intensified in the SAB due to cooling. It is critical to consider the temperature influence on DIC and Warag through its influence on fCO2 solubility and thus air-sea CO2 flux in the estimate of carbonate system trends in regional models. |
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