HR: 1340h
AN: B23A-0921    [Abstracts]
TI: Remote Measurements of Atmospheric Carbon Column Densities: Error Analysis and Early Results
AU: * Connor, B J
EM: b.connor@niwa.co.nz
AF: National Institute of Water and Atmospheric Research, PB 50061, Omakau, 9182 New Zealand
AU: Sherlock, V
EM: v.sherlock@niwa.co.nz
AF: National Institute of Water and Atmospheric Research, PB 50061, Omakau, 9182 New Zealand
AU: Wood, S W
EM: s.wood@niwa.co.nz
AF: National Institute of Water and Atmospheric Research, PB 50061, Omakau, 9182 New Zealand
AU: Toon, G C
EM: toon@caesar.jpl.nasa.gov
AF: Jet Propulsion Laboratory, 4800 Oak Grove Dr, Pasadena, CA 91109 United States
AU: Wennberg, P O
EM: wennberg@gps.caltech.edu
AF: California Institute of Technology, MC 150/21, Pasadena, CA 91125 United States
AB: A global network for tropospheric carbon column density observations is currently being developed. Fourier Transform Spectrometers (FTS) operating in near-infrared solar absorption will measure column densities of CO$_{2}$, CH$_{4}$, and CO simultaneously. Such observations provide atmospheric sampling complementary to in-situ measurements, and will greatly reduce uncertainties in the inference of surface-atmosphere carbon flux. Here we present a preliminary analysis of errors expected in the absorption spectra, and how they affect the column densities. Algorithms using both fixed and variable altitude profile shapes are considered ("profile scaling" and "profile retrieval", respectively). The types of error studied include both fixed and variable forward model errors such as molecular line broadening and the atmospheric temperature profile, as well as noise and smoothing error. We also present preliminary results of CO$_{2}$, CH$_{4}$, and CO column measurements made at Lauder, New Zealand, and compare their variability to that predicted by the error analysis.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0315 Biosphere/atmosphere interactions
DE: 0365 Troposphere--composition and chemistry
DE: 0394 Instruments and techniques
DE: 0400 Biogeosciences
SC: Biogeosciences [B]
MN: 2004 AGU Fall Meeting