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Title: Retrieval of moisture profiles using satellite measurements of precipitable water and study of their impact on numerical weather prediction models
Authors: Basu, Sujit
Gairola, R M
Kishtwal, C M
Pandey, P C
Bohra, A K
Rajan, D
Mitra, A K
Issue Date: Apr-1997
Publisher: NISCAIR-CSIR, India
Abstract: A semi-statistical retrieval technique developed for retrieving vertical humidity profiles over the open oceans and island stations from satellite measurements of total precipitable water (TPW) and the impact of these vertical moisture profiles on global numerical assimilation and medium range forecast system at the National Center for Medium Range Weather Forecasting (NCMRWF), New Delhi, are described. The retrieval technique is based upon empirical orthogonal function (EOF) analysis and its power has been demonstrated using 127 independent radiosonde measurements as well as a few satellite measurements of TPW. For the impact study, a 30-day period starting from 1 June 1994 was selected which covered the monsoon onset phase. The medium range forecast experiments were carried out from 5 initial conditions starting from 5 June 1994. The impact has been studies in terms of objective scores and geographical distributions of analyses and predictions of some of the prognostic variables: zonal and meridional components of wind, temperature, and specific humidity. The derived profiles show lower root mean square errors (RMSE) than the first guess and hence can be used in data sparse regions. It ha also been noticed that the analysis and the medium range forecasts are able to respond to the inclusion of satellite derived moisture data. The study has demonstrated the feasibility of using satellite derived moisture data in NCMRWF operational analysis forecast system.
Page(s): 49-76
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.26(2) [April 1997]

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