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Algorithms proposed to retrieve water vapor are usually developed using statistical regression. Recent results have shown that this global statistical approach creates systematic geographical errors implying systematic biases. In the particular case of the wet tropospheric correction for altimetry missions, these biases directly distort the sea level estimation. After an in-depth analysis of the retrieval...
In order to correct the altimeter range for tropospheric humidity, a Microwave Radiometer is added to altimetry missions (Envisat/MWR, Jason/JMR, TOPEX-Poseidon/TMR). Over open ocean, the combination altimeter/radiometer is satisfactory. This is not the case in coastal zones, where the signal coming from the surrounding land surfaces contaminates the radiometer measurement and makes the humidity retrieval...
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