HR: 11:30h
AN: A12D-05    [Abstracts]
TI: Using SCIAMACHY and Ground-based FTS Measurements to Test the OCO X_CO2 Retrieval and Validation Approach
AU: * Boesch, H
EM: hartmut.boesch@jpl.nasa.gov
AF: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109 United States
AU: Buchwitz, M
EM: Michael.Buchwitz@iup.physik.uni-bremen.de
AF: Institute of Environmental Physics, University of Bremen, Otto-Hahn-Allee 1, Bremen, 28359 Germany
AU: Connor, B
EM: b.connor@niwa.co.nz
AF: National Institute of Water and Atmospheric Research, PB 50061, Lauder, 9182 New Zealand
AU: Griffith, D
EM: griffith@uow.edu.au
AF: Department of Chemistry, Wollongong University, Wollongong, NSW 2522 Australia
AU: Li, Q
EM: Qinbin.Li@jpl.nasa.gov
AF: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109 United States
AU: Salawitch, R
EM: ross.salawitch@jpl.nasa.gov
AF: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109 United States
AU: Sen, B
EM: bhaswar.sen@jpl.nasa.gov
AF: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109 United States
AU: Sherlock, V
EM: v.sherlock@niwa.co.nz
AF: National Institute of Water and Atmospheric Research, PB 50061, Lauder, 9182 New Zealand
AU: Toon, G
EM: geoffrey.toon@jpl.nasa.gov
AF: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109 United States
AU: Washenfelder, R
EM: rebeccaw@gps.caltech.edu
AF: Division of Geological and Planetary Sciences, California Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125 United States
AU: Wennberg, P
EM: wennberg@gps.caltech.edu
AF: Division of Geological and Planetary Sciences, California Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125 United States
AB: We have used the retrieval algorithm that has been developed for the Orbiting Carbon Observatory (OCO) mission, to retrieve the dry air mole fraction of CO₂ (X_CO2) from ground-based Fourier Transform Spectrometers (FTS) and coincident SCIAMACHY measurements. For both instruments we have used the 760 nm O₂ A-band and the 1580 nm CO₂ band to infer X_CO2. After accounting for a systematic error in the surface pressure retrieval from the O₂ A-band, which we attribute to inadequacies in our modeling of the O₂ absorption cross-section (non-Voigt far-wing line shape) and after adding a 1% intensity offset to the calculated SCIAMACHY O₂ A-band spectra, we obtain good consistency between SCIAMACHY and the ground-based FTS. Despite the large scatter in SCIAMACHY X_CO2, these measurements clearly illustrate the annual CO₂ cycle and are in agreement with model calculations. Significant improvements to precision and accuracy of these kinds of measurements will be obtained from a dedicated CO₂ instrument such as OCO, with has much higher spectral and spatial resolution than SCIAMACHY.
DE: 0365 Troposphere: composition and chemistry
DE: 0394 Instruments and techniques
DE: 1640 Remote sensing (1855)
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005