Retrieval of Atmospheric Moisture Profiles over Indian Region with Two Different Approaches Using AMSU Data From NOAA-16 Satellite

摘要

The moisture information retrieved from the satellites, specially from the passive microwave data obtained from orbiting satellites have been recently used for a few studies over the Indian region. With the establishment of a new High Resolution Picture Transmission (HRPT) reception system at IMD, New Delhi , the real time data from microwave sounding instruments onboard the NOAA-K,L,M and N series of satellites has also become available. The raw HRPT data is being interfaced with the recently acquired new 'Atovs and Avhrr Preprocessing Package(AAPP)' levelld files to perform moisture retrievals from AMSU data of NOAA-16 satellite using two separate schemes ICI (inversion coupled imager) and Neural Network approach. In this study , NOAA-16 satellite data over Indian region were used for reconstructing temperature and moisture profiles for two different seasons(January and April,2002). The moisture retrieval results are evaluated by computing the bias and root mean square (RMS) difference between moisture retrievals and colocated ECMWF analysis. The results based on the analysis of data sets for the month of January and April ,2002 show that ICI approach yields better results for all atmospheric levels. The root mean square error of relative humidity is found to be less than 20% at all pressure levels except for upper atmospheric level of about 400 hPa where it is more than 20%. Further work is in progress to extend this analysis to different seasons over Indian region and the detailed results will be presented during the seminar.