Table of Contents
International Journal of Atmospheric Sciences
Volume 2014, Article ID 645970, 10 pages
Research Article

Retrieval of Layer Averaged Relative Humidity Profiles from MHS Observations over Tropical Region

Geophysical-Parameter Retrievals Division, Atmospheric and Oceanic Sciences Group Earth, Ocean, Atmosphere, Planetary Sciences and Applications Area Space Applications Centre (ISRO), Ahmedabad 380015, India

Received 2 April 2014; Revised 19 June 2014; Accepted 19 June 2014; Published 17 July 2014

Academic Editor: Francesco Cairo

Copyright © 2014 R. K. Gangwar et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The present paper deals with the retrieval of the atmospheric layer averaged relative humidity profiles using data from the Microwave Humidity Sounder (MHS) onboard the MetOp satellite. The retrieval has been innovatively performed by firstly retrieving humidity for pairs of thick overlapping layers (TOLs) used subsequently to derive humidity for associated thin isolated layer (TIL). A water vapour dependent (WVD) algorithm has been developed and applied to infer the humidity of TOLs. Thus, the retrieved profiles have been finally compared with standard algorithm (NORM). These algorithms have been developed based on radiative transfer simulations and study of sensitivities of MHS channels on humidity of various types of layers (TOL, TIL). The algorithm has been tested with MHS data and validated using concurrent radiosonde as well as NCEP reanalysis data indicating profile errors of ~15% and ~19%, respectively.