Application of ALOS-PALSAR to Estimates CO2 Transfer Velocities (kCO2) comparing with Satellite Wind Speed Data, A comparison between 2007 and 2008

Gas exchange contributes to the mitigation of an anthropogenic greenhouse effect through absorption of excess atmospheric CO2 by the oceans. The gas transfer velocity requires computation in order to describe gas exchange and interaction. The absolute calibration of the relationship between air and sea CO2 transfer velocity and wind speed (U10) has been under debate for a long time because the global averages of the CO2 exchange coefficients, deduced from many experimental data relationships, disagreed with each other. In this research, the CO2 transfer velocity (kCO2 ) was derived from satellite wind speeds that were computed using three different parameterizations (k–U) and was then compared with the kCO2 derived from Phased Array type L-band Synthetic Aperture Radar (PALSAR) (kP). To obtain the transfer velocity of CO2 between the atmosphere and ocean using PALSAR in the Bali Sea area close to the Indian Ocean, daily sea surface temperature, wind friction velocity (U?) from PALSAR images and oceanography data were collected and analysed. Additionally, kCO2 values were computed from the QuikSCAT satellite wind speed and compared to three different k–U relationships suggested by different authors. The three algorithms of kCO2 parameterization were used with QuikSCAT daily data and produced a value that was close to that of kCO2 derived from PALSAR (kP).