Estimation of precipitable water vapour from NOAA-AVHRR data during the Hapex Sahel experiment

Abstract The simple split-window and the transmittance ratio method for estimation of atmospheric precipitable water content were analysed using data gathered through the Hapex Sahel Experiment conducted in Niger from August to October 1992. Results are presented for the Hapex Sahel square degree. Both methods are designed to work with thermal infrared data from the Advanced Very High Resolution Radiometer flown on the NOAA polar orbiting satellites. The performance of the methods were evaluated with radiosonde measurements and prognosticated water vapour fields obtained from the global circulation model used at the European Centre for Medium Weather Forecast. The implications of extending the simple split-window method to work over land surfaces were investigated by use of both simulated and observed data. It was shown that changing surface conditions, i.e., emissivity and surface temperature, could significantly influence the split-window estimate of water vapour content and therefore inhibit the implem...

[1]  Yann Kerr,et al.  Geographical, biological and remote sensing aspects of the hydrologic atmospheric pilot experiment in the sahel (HAPEX-Sahel) , 1995 .

[2]  G. Dalu.  Satellite remote sensing of atmospheric water vapour , 1986 .

[3]  B. N. Holben,et al.  Towards operational radiometric calibration of NOAA AVHRR imagery in the visible and near-infrared channels , 1994 .

[4]  Thomas F. Eck,et al.  AVHRR split window temperature differences and total precipitable water over land surfaces , 1994 .

[5]  L. Lauritson,et al.  Data extraction and calibration of TIROS-N/NOAA radiometers , 1979 .

[6]  José A. Sobrino,et al.  On the atmospheric dependence of the split-window equation for land surface temperature , 1994 .

[7]  G. d’Almeida,et al.  On the variability of desert aerosol radiative characteristics , 1987 .

[8]  Thomas J. Schmugge,et al.  Imation of land surface emissivity differences in the split-window channels of AVHRR , 1994 .

[9]  F. X. Kneizys,et al.  Users Guide to LOWTRAN 7 , 1988 .

[10]  T. O. Aro.  Analysis of data on surface and tropospheric water vapour , 1976 .

[11]  Thomas F. Eck,et al.  Precipitable water in the Sahel measured using sun photometry. , 1990 .

[12]  Gérard Dedieu,et al.  Use of a meteorology model to correct atmospheric effects inNOAA-AVHRR data , 1994 .

[13]  Yoram J. Kaufman,et al.  Atmospheric correction against algorithm for NOAA-AVHRR products: theory and application , 1992, IEEE Trans. Geosci. Remote. Sens..

[14]  Henrik Steen Andersen,et al.  Land surface temperature estimation based on NOAA-AVHRR data during the HAPEX-Sahel experiment , 1997 .

[15]  Larry M. McMillin,et al.  Retrieval of Precipitable Water from Observations in the Split Window over Varying Surface Temperatures , 1990 .

[16]  F. Becker,et al.  The impact of spectral emissivity on the measurement of land surface temperature from a satellite , 1987 .

[17]  Zhao-Liang Li,et al.  Improvements in the split-window technique for land surface temperature determination , 1994, IEEE Trans. Geosci. Remote. Sens..

[18]  Gary J. Jedlovec,et al.  Precipitable water estimation from high-resolution split window radiance measurements , 1990 .

[19]  J.-P. Goutorbe,et al.  HAPEX-Sahel: a large-scale study of land-atmosphere interactions in the semi-arid tropics , 1994 .

[20]  Didier Tanré,et al.  Atmospheric effects on NOAA AVHRR data over Sahelian regions , 1991 .

[21]  C. Justice,et al.  The effect of water vapour on the normalized difference vegetation index derived for the Sahelian region from NOAA AVHRR data , 1991 .