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The Atmospheric InfraRed Sounder (AIRS) is the first of a new generation of high spectral resolution infrared sounder with 2378 channels measuring outgoing radiance between 650cm-1 and 2675 cm-1.The improved vertical resolving power of AIRS has been proved to greatly improve the accuracy of temperature and moisture soundings, as well as other important climate parameters, such as sea surface temperature, OLR, trace gases, etc..