Space‐based retrievals of air‐sea gas transfer velocities using altimeters: Calibration for dimethyl sulfide

摘要: This study is the first to directly correlate gas transfer velocity, measured at sea using eddy-correlation (EC) technique, and satellite altimeter backscattering. During eight research cruises in different parts of world, velocity dimethyl sulfide (DMS) was measured. The sample times locations were compared with overpass remote sensing satellites carrying Ku-band altimeters: ERS-1, ERS-2, TOPEX, POSEIDON, GEOSAT Follow-On, JASON-1, JASON-2 ENVISAT. result 179 pairs measurements backscattering coefficients. An inter-calibration altimeters significantly reduced data scatter. inter-calibrated best fitted a quadratic relation between inverse coefficients measurements. A parameterization based on backscattering, corresponding surface roughness, might be expected perform better than wind speed-based parameterizations. Our results, however, did not show improvement direct correlation shipboard speeds. relationship satellite-derived backscatter, or speed, useful provide retrieval algorithms. Gas (cm/hr), corrected Schmidt number 660, proportional speed (m/s). controlled by both individual water-side air-side velocities. We calculated latter numerical scheme, derive velocity. DMS sufficiently soluble neglect bubble-mediated transfer, thus, velocities could applied estimate through unbroken any other gas Key Points: - Show relations field values air-sea transfer - can used gas - Direct (for Sc = 660) roughly double 10 m