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ToolsRibas-Ribas, Mariana, Battaglia, Gianna, Humphreys, Matthew P. and Wurl, Oliver (2019) Impact of nonzero intercept gas transfer velocity parameterizations on global and regional ocean–atmosphere CO2 fluxes. Geosciences, 9 (5). ISSN 2076-3263
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Abstract
Carbon dioxide (CO2) fluxes between the ocean and atmosphere (FCO2) are commonly computed from differences between their partial pressures of CO2 (∆pCO2) and the gas transfer velocity (k). Commonly used wind-based parameterizations for k imply a zero intercept, although in situ field data below 4 m s−1 are scarce. Considering a global average wind speed over the ocean of 6.6 m s−1, a nonzero intercept might have a significant impact on global FCO2. Here, we present a database of 245 in situ measurements of k obtained with the floating chamber technique (Sniffle), 190 of which have wind speeds lower than 4 m s−1. A quadratic parameterization with wind speed and a nonzero intercept resulted in the best fit for k. We further tested FCO2 calculated with a different parameterization with a complementary pCO2 observation-based product. Furthermore, we ran a simulation in a well-tested ocean model of intermediate complexity to test the implications of different gas transfer velocity parameterizations for the natural carbon cycle. The global ocean observation-based analysis suggests that ignoring a nonzero intercept results in an ocean-sink increase of 0.73 Gt C yr−1. This corresponds to a 28% higher uptake of CO2 compared with the flux calculated from a parameterization with a nonzero intercept. The differences in FCO2 were higher in the case of low wind conditions and large ∆pCO2 between the ocean and atmosphere. Such conditions occur frequently in the Tropics.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | carbon cycle,carbon dioxide,gas transfer velocity,low wind speed,ocean-atmosphere co flux,earth and planetary sciences(all) ,/dk/atira/pure/subjectarea/asjc/1900 |
| UEA Research Groups: | Faculty of Science > Research Groups > Centre for Ocean and Atmospheric Sciences |
| Related URLs: | |
| Depositing User: | LivePure Connector |
| Date Deposited: | 05 Jul 2019 10:30 |
| Last Modified: | 22 Oct 2022 04:58 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/71638 |
| DOI: | 10.3390/geosciences9050230 |
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