Inferring Air-Sea Carbon Dioxide Transfer Velocities From Sea Surface Scatterometer Measurements
DOI: https://doi.org/10.1029/2019JC014982
Persistent URL: http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/8976
Persistent URL: http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/8976
Ghobadian, M.; Stammer, D., 2019: Inferring Air-Sea Carbon Dioxide Transfer Velocities From Sea Surface Scatterometer Measurements. In: Journal of Geophysical Research: Oceans, Band 124, 11: 7974 - 7988, DOI: 10.1029/2019JC014982.
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C-band microwave sea surface radar backscatter observations from the FINO-2 tower in the western Baltic are analyzed with respect to their relevance for air-sea CO2 transfer velocity parameterizations. The scatterometer measurements observed from a height of 25 m above the sea surface using a multifrequency scatterometer instrument of the University of Hamburg were obtained quasi-simultaneously with eddy covariance CO2 flux measurements. Both data sets are merged here to derive a gas transfer velocity parameterization based on radar backscatter measurements. At the location of the FINO-2 tower, the resulting time-averaged gas transfer velocity amounts to 26.95 cm/hr. In combination with
ΔPCO2 measurements available from the vicinity of the FINO-2 platform, a time-mean CO2 flux of 0.23 μmol·m−2·s−1 into the Baltic was estimated. Applied to monthly mean satellite-based C-band ASCAT scatterometer data, the newly derived gas transfer velocity parameterization provides estimates of seasonal and annual mean global maps of air-sea transfer velocities. The new results agree in their general pattern with previous estimates using wind speed parameterization. However, the backscatter-based transfer velocities appear smaller at higher latitudes. Globally averaged air-sea CO2 fluxes would thereby be reduced by 20%. To what extent this is a robust result, or if it depends on the fact that the training data set did not represent conditions, has to be investigated in the future.
Statistik:
ZugriffsstatistikSammlung:
- Geographie, Hydrologie [454]
Schlagworte:
new air-sea flux parameterization for CO2 fluxesapplication of new parameterization to satellite scatterometer data
seasonal and annual mean CO2 estimates
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