Atmospheric humidity profile retrieval algorithms for Megha-Tropiques SAPHIR: a simulation study and analysis of AMSU-B data

B. S. Gohil; A. K. Mathur; A. Sarkar; Vijay K. Agarwal

doi:10.1117/12.693566

8 December 2006 Atmospheric humidity profile retrieval algorithms for Megha-Tropiques SAPHIR: a simulation study and analysis of AMSU-B data

B. S. Gohil, A. K. Mathur, A. Sarkar, Vijay K. Agarwal

Author Affiliations +

Proceedings Volume 6408, Remote Sensing of the Atmosphere and Clouds; 640803 (2006) https://doi.org/10.1117/12.693566
Event: SPIE Asia-Pacific Remote Sensing, 2006, Goa, India

Abstract

Emission based radiative transfer simulations have been carried out to study the impact of atmospheric humidity on clear-sky microwave emissions at various channels of Megha-Tropiques SAPHIR and NOAA AMSU-B sounders. Detailed investigations reveal that under cool and drier conditions, water vapour channels in the far wing region like 183.31±7 GHz of AMSU-B and others behave like microwave imagers in contradiction to these being sounding channels. This feature affects their utility for sounding the lower atmosphere. Simulation study confirms that the layer average relative humidity is retrieved better as compared to its other forms requiring temperature information and has logarithmic dependency on radiation. Present study deals with development of retrieval algorithms using multi-channel sounder data for deriving average relative humidity for different layers of the atmosphere. AMSU-B data during June and October 2002 over Indian region have been used for testing the algorithms to derive relative humidity in three layers between 300 to 1000 hpa. The satellite derived humidity fields have been compared and found to be in good agreement with those from NCEP data.

Citation Download Citation

B. S. Gohil, A. K. Mathur, A. Sarkar, and Vijay K. Agarwal "Atmospheric humidity profile retrieval algorithms for Megha-Tropiques SAPHIR: a simulation study and analysis of AMSU-B data", Proc. SPIE 6408, Remote Sensing of the Atmosphere and Clouds, 640803 (8 December 2006); https://doi.org/10.1117/12.693566

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