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To estimate sea surface temperature(SST)with high accuracy from radiometrie measure-ments,it is no longer acceptable to assume that sea surface emissivity is unity or any other con-stant.This note presents an investigation of the desirable emissivity accuracy in relation to re-trieval.It was found that 1% error in surface emissivity can cause up to 0.7 K error in the re-trieved SST,although this sensitivity is often reduced to about 0.5 K on average because of thedownward atmospheric radiation at surface partially compensates for the emissivity error.Since thedownward atmospheric radiation ratio is controlled to a large extent by the integrated water vaporin the atmosphere and,secondarily,by view angle,the sensitivity of SST retrieval to surface emis-sivity has been computed as a function of these two parameters.
To estimate sea surface temperature (SST) with high accuracy from radiometrie measure-ments, it is no longer acceptable to assume that sea surface emissivity is unity or any other con-stant. This note presents an investigation of the desirable emissivity accuracy in relation to re- trieval. It was found that 1% error in surface emissivity can cause up to 0.7 K error in the re-trieved SST, although this sensitivity is often reduced to about 0.5 K on average because of the downwardward atmospheric radiation at surface partially compensates for the emissivity error. Since the downward atmospheric radiation ratio is controlled by a large extent by the integrated water vapor in the atmosphere and, secondarily, by view angle, the sensitivity of SST retrieval to surface emis-sivity has been computed as a function of these two parameters .