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Constraining Southern Ocean CO2 flux uncertainty using uncrewed surface vehicle observations


Sutton, AJ and Williams, NL and Tilbrook, B, Constraining Southern Ocean CO2 flux uncertainty using uncrewed surface vehicle observations, Geophysical Research Letters, 48, (3) Article e2020GL091748. ISSN 0094-8276 (2021) [Refereed Article]

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DOI: doi:10.1029/2020GL091748


Remote, harsh conditions of the Southern Ocean challenge our ability to observe the regionís influence on the climate system. Southern Ocean air-sea CO2 flux estimates have significant uncertainty due to the reliance on limited ship-dependent observations in combination with satellite-based and interpolated data products. We utilize a new approach, making direct measurements of air-sea CO2, wind speed, and surface ocean properties on an Uncrewed Surface Vehicle (USV). In 2019, the USV completed the first autonomous circumnavigation of Antarctica providing hourly CO2 flux estimates. Using this unique data set to constrain potential error in different measurements and propagate those through the CO2 flux calculation, we find that different wind speed products and sampling frequencies have the largest impact on CO2 flux estimates with biases that range from −4% to +20%. These biases and poorly constrained interannual variability could account for discrepancies between different approaches to estimating Southern Ocean CO2 uptake.

Item Details

Item Type:Refereed Article
Keywords:CO2 flux, new observing technology, Southern Ocean CO2 sink, surface ocean pCO2
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Chemical oceanography
Objective Division:Environmental Management
Objective Group:Management of Antarctic and Southern Ocean environments
Objective Field:Antarctic and Southern Ocean oceanic processes
UTAS Author:Tilbrook, B (Dr Bronte Tilbrook)
ID Code:152044
Year Published:2021
Web of Science® Times Cited:12
Deposited By:Australian Antarctic Program Partnership
Deposited On:2022-08-10
Last Modified:2022-08-24

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