AN ASSESSMENT OF THE IMPACT OF SATELLITE MICROWAVE SOUNDER INCIDENCE ANGLE AND SCAN GEOMETRY ON THE ACCURACY OF ATMOSPHERIC-TEMPERATURE PROFILE RETRIEVALS

Cross-track and conical scan microwave sounder designs are compared wi th respect to temperature profile retrieval accuracy in nonprecipitati ng atmospheres and with respect to the beamfilling effect of precipita tion. The conical design shows slightly better accuracy at pressure le vels of 3 hPa or less, while the cross-track design performs slightly better at pressure levels of 850 hPa or greater. Under the assumption that precipitation-contaminated fields of view would be rejected, cons ideration of beamfilling by rain cells indicates that retrieval yield would be higher for the cross-track design.