HR: 1330h
AN: A42C-0769    [PDF]
TI: Recent Improvements to the FTIR Chemical Profile Retrieval Algorithm SFit2
AU: * Hannigan, J W
EM: jamesw@ucar.edu
AF: National Center for Atmospheric Research, POBox 3000, Boulder, CO 80303 United States
AU: Goldman, A
EM: goldman@ucar.edu
AF: National Center for Atmospheric Research, POBox 3000, Boulder, CO 80303 United States
AU: Goldman, A
EM: goldman@ucar.edu
AF: Univ. of Denver, Dept. of Physics, Denver, CO 80208 United States
AU: Coffey, M T
EM: coffey@ucar.edu
AF: National Center for Atmospheric Research, POBox 3000, Boulder, CO 80303 United States
AB: A primary purpose of the ground-based remote sensing Network for the Detection of Stratospheric Change (NDSC) [Kurylo and Zander, 2001] is the validation of satellite measurements. Recently a thorough treatment of intercomparison methods for remotely sounded data has been derived [Rodgers and Connor, 2003]. A conclusion of that work is the usefulness of comparing the product of the total column operator on the retrieved profiles. However, comparisons of products of increasingly higher vertical resolution that were beyond the initial scope of the NDSC-FTIR charter and are attained by satellite-bourne instruments are being pursued. A limited version of the optimal estimation technique is implemented in the chemical constituent retrieval algorithm SFit2 that is in wide use among the NDSC-FTIR community and has been used in many profile retrieval studies. Recent improvements to the code including the accommodation of a broader selection of a priori covariances, the use of several observations at differing solar zenith angles and the ability to limit the retrieval by specie and micro-window are improving the precision of the retrievals. Application of these changes are shown using data from the inter-compared solar viewing 0.0035cm$^{-1}$ resolution Fourier transform infrared interferometer installed at the NDSC primary site in Thule, Greenland (76.5N, 68.8W, 225masl).
DE: 0340 Middle atmosphere--composition and chemistry
DE: 0394 Instruments and techniques
DE: 1694 Instruments and techniques
DE: 3260 Inverse theory
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting