Notes on IASI Performance
COLLARD, A.D.
The Infrared Atmospheric Sounding Interferometer (IASI) is to be launched on the METOP series of satellites starting in early 2003. IASI will be one of a new breed of infra-red atmospheric sounding instruments with high spectral resolution and thousands of individual channels. It is anticipated that these orders of magnitude improvement over current infra-red sounding instruments will produce large improvements in our abilities to measure atmospheric temperatures and humidities from space. According to the mission requirements, with IASI one should be able to measure the temperature of the atmosphere with an accuracy of 1K and a vertical resolution of 1km in the lower troposphere and measure relative humidity to an accuracy of 10% and a vertical resolution of 1-2 km in the same altitude range. If one interprets these requirements (as is often the case) as the ability to retrieve to the required accuracy on a grid of 1km or less, IASI retrievals will be able to reach these criteria. Another ...
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