USAP-DC

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The Role of Cyclonic Upwelling Eddies in Southern Ocean CO2 Flux Short Title: The Role of Cyclonic Upwelling Eddies in Southern Ocean CO2 Flux Start Date: 2021-06-01 End Date: 2024-05-30 Description/Abstract We propose to better characterize the role of eddies in wintertime air-sea carbon dioxide (CO2) fluxes in the Indian sector of the Southern Ocean using two autonomous sailing vehicles called Saildrones during austral winter 2021. The Saildrones will carry sensors to directly measure atmospheric and oceanic concentrations of CO2 (pCO2), atmospheric pressure, and wind speed to allow calculation of air-sea CO2 flux at 5-km resolution and similar accuracy to an underway ship-based measurement. The Saildrone data from this mission, a 2019 mission, and BGC Argo float data from 2014–2020 will be co-located with eddies derived from satellite altimetry to quantify the relationships between eddies and ocean carbon content. The overall objectives of this project are to determine the relationship between wintertime pCO2 variability and the presence and structure of eddies and to use these relationships to create a better representation of mesoscale variability in Southern Ocean CO2 flux. Personnel Person Role Williams, Nancy Investigator and contact Chambers, Don Co-Investigator Lindstrom, Eric Co-Investigator Carter, Brendan Co-Investigator Tamsitt, Veronica Researcher Bonin, Jennifer Researcher Funding Antarctic Ocean and Atmospheric Sciences Award # 2048840 AMD - DIF Record(s) USAP-2048840_1 Data Management Plan Williams_OPP_DataManagement.pdf Product Level: 1 (processed data) Publications Tamsitt, V. (2023). New insights into air-sea fluxes and their role in Subantarctic Mode Water formation. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 381(2249). (doi:10.1098/rsta.2022.0066) Keywords Amd/Us Argo Float CO2 DISSOLVED GASES OCEAN CHEMISTRY OCEAN MIXED LAYER PH Saildrone Southern Ocean Platforms and Instruments Ships