Inverting for geophysical parameters from IMG radiances

Radiances observed by the Interferometric Monitor for Greenhouse gases sounder have been used to retrieve temperature, water vapor, and ozone profiles. It is shown that the sounder allows one to simultaneously retrieve stable solutions for temperature and water vapor. Once water vapor and temperature have been retrieved, ozone profile may be estimated on the same fine vertical mesh as water vapor and temperature. Comparison among calculated and observed radiances shows good agreement in several parts of the thermal band which is sensed by the sounder. A slight discrepancy is observed in the wing region of the 720-cm/sup -1/ CO/sub 2/ Q-branch, whereas the most severe form of disagreement is seen in the 6.7-/spl mu/m vibrational H/sub 2/O absorption band. Nevertheless, suitable spectral ranges may be identified which yield accurate and stable inversions for temperature, water vapor, and ozone.

[1]  Per Christian Hansen,et al.  Analysis of Discrete Ill-Posed Problems by Means of the L-Curve , 1992, SIAM Rev..

[2]  R. Beer.  Remote Sensing by Fourier Transform Spectrometry , 1992 .

[3]  Moustafa T. Chahine,et al.  High spectral resolution infrared remote sensing for earth's weather and climate studies , 1993 .

[4]  U. Amato,et al.  The CHIARA inversion algorithm for IMG , 1998, IGARSS '98. Sensing and Managing the Environment. 1998 IEEE International Geoscience and Remote Sensing. Symposium Proceedings. (Cat. No.98CH36174).

[5]  William L. Smith,et al.  Linear simultaneous solution for temperature and absorbing constituent profiles from radiance spectra. , 1991, Applied optics.

[6]  P.F.W. van Delst,et al.  AERI downwelling infrared radiance observations and calculations: case studies from the 1997 DOE ARM CART Water Vapor Intensive Operations Period , 1998, IGARSS '98. Sensing and Managing the Environment. 1998 IEEE International Geoscience and Remote Sensing. Symposium Proceedings. (Cat. No.98CH36174).

[7]  Hartmut H. Aumann,et al.  Atmospheric Infrared Sounder on the Earth Observing System , 1994 .

[8]  Umberto Amato,et al.  Retrieval of temperature vertical profile from radiance spectra by inversion of the radiative transfer equation , 1997, Remote Sensing.

[9]  L. Strow,et al.  CO2 Q-Branch Lineshapes for Atmospheric Remote Sensing , 1993 .

[10]  A. N. Tikhonov,et al.  Solutions of ill-posed problems , 1977 .

[11]  Umberto Amato,et al.  New quasi-analytical method for evaluating the coefficients of a linearized RTE model , 1997, Remote Sensing.

[12]  Umberto Amato,et al.  Evaluating the effect of the inter‐relationships among the different spectral bands on iasi performance , 1997 .

[13]  C. Rodgers,et al.  Retrieval of atmospheric temperature and composition from remote measurements of thermal radiation , 1976 .

[14]  P. Hansen.  Regularization,GSVD and truncatedGSVD , 1989 .