Abstract
The remote sensing of evaporation over sea mainly requires to derive three quantities from satellite data: Sea surface temperature, surface wind speed and specific air humidity. The sea surface temperature is derived from infrared imagery of the Advanced Very High Resolution Radiometer (AVHRR), flown on the NOAA polar orbiters and from the Along Track Scanning Radiometer (ATSR) operated on the ERS-1 satellite. Split- and dual-window techniques are employed in order to correct the satellite-measured brightness temperatures for atmospheric effects, mainly due to water vapors. Recent techniques include nonlinear terms and information from other radiometers improving the retrieval accuracy. Attention must be paid to the difference between bulk and skin surface temperatures which can be as great as ± 1K due to the skin cooling and the diurnal thermocline. This difference is of the order of the retrieval accuracy achieved nowadays and must be known when interpreting satellite-derived sea surface temperatures. Surface wind speed and near-surface humidity are obtained from passive microwave measurements of the Special Sensor Microwave/Imager (SSM/I) that is part of the DMSP satellite series. While the surface wind speed is derived from brightness-temperature variations induced by emissivity changes in resposne to surface roughness and foam coverage the determination of the surface air humidity is related to the water-vapour columns that can be retrieved from multi-channel retrieval schemes applied to the satellite-measured microwave data. Recent investigations show that the SSM/I not only allows to retrieve the total precipitable water but also the water-vapour column of the lower 500 m which is closer related to the surface air humidity than the total water-vapour column. The retrieval methods are developed by means of radiative transfer simulations and subsequent multivariate analysis. An application of the theoretically developed techniques to real satellite data and comparisons with in-situ measurements are performed to test the single parameter retrievals. A subsequent intercomparison of the latent heat fluxes dared from satellites with those obtained from from ship measurements sheds light on the retrieval accuracy and on the differences between various methods in use. For single match-ups the standard deviation between ship and satellite measurements is about 30 W/m2 leading to monthly mean errors less than 10 W/m2.
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© 1996 Springer-Verlag Berlin Heidelberg
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Schlüssel, P. (1996). Satellite Remote Sensing of Evaporation over Sea. In: Raschke, E. (eds) Radiation and Water in the Climate System. Nato ASI Series, vol 45. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-03289-3_16
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DOI: https://doi.org/10.1007/978-3-662-03289-3_16
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