HR: 08:35h
AN: B21E-03    [Abstracts]
TI: Carbon Dioxide and Methane Column Abundances Retrieved from Ground-Based Near-Infrared Solar Spectra and Comparison with In Situ Aircraft Profiles
AU: * Washenfelder, R A
EM: rebeccaw@caltech.edu
AF: California Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125 United States
AU: Toon, G C
EM: toon@mark4sun.jpl.nasa.gov
AF: NASA Jet Propulsion Laboratory, 4800 Oak Grove Dr., Pasadena, CA 91109 United States
AU: Blavier, J
EM: blavier@mark4sun.jpl.nasa.gov
AF: NASA 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, 1200 E. California Blvd., Pasadena, CA 91125 United States
AU: Yang, Z
EM: yangzh@gps.caltech.edu
AF: California Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125 United States
AU: Vay, S A
EM: s.a.vay@larc.nasa.gov
AF: NASA Langley Research Center, 100 Nasa Rd., Hampton, VA 23681 United States
AU: Sachse, G W
EM: glen.w.sachse@nasa.gov
AF: NASA Langley Research Center, 100 Nasa Rd., Hampton, VA 23681 United States
AU: Blake, D R
EM: dblake@orion.oac.uci.edu
AF: University of California, Irvine, Department of Chemistry, Irvine, CA 92697 United States
AU: Matross, D M
EM: matross@fas.harvard.edu
AF: Harvard University, Department of Earth and Planetary Sciences, Cambridge, MA 02138 United States
AU: Gerbig, C
EM: cgerbig@bgc-jena.mpg.de
AF: Max-Planck-Institut fur Biogeochemie, Hans-Knoell-Str. 10, Jena, D-07745 Germany
AB: We have developed an automated observatory for measuring ground-based column abundances of CO$_{2}$, CH$_{4}$, CO, N$_{2}$O, O$_{2}$, H$_{2}$O, and HF. Near-infrared spectra of the direct sun are measured between 3,900 - 15,600 cm$^{-1}$ (0.67 - 2.56 $\mu$m) by a Bruker 125HR Fourier Transform Spectrometer. This is the first laboratory in a proposed network of ground-based solar observatories that will be used for carbon cycle studies and validation of spaceborne column measurements of greenhouse gases. The laboratory was assembled in Pasadena, California and then permanently deployed to northern Wisconsin during May 2004. It is located in the heavily forested Chequamegon National Forest at the WLEF Tall Tower site, 14 km east of Park Falls, Wisconsin. This site was chosen because NOAA CMDL and other groups conduct intensive measurements in the area, including continuous monitoring of CO$_{2}$ at six heights on the 447-m tall tower. CO$_{2}$ and CH$_{4}$ column abundances for May - November 2004 demonstrate $\sim$0.1% precision. The seasonal drawdown of CO$_{2}$ is recognizable within the late-May column abundances. As part of the INTEX and COBRA campaigns, the DC-8 or King Air recorded in situ measurements during profiles over the WLEF site during five dates in July and August 2004. We will compare the column abundances of CO$_{2}$, CH$_{4}$, and CO with these in situ aircraft measurements.
DE: 1694 Instruments and techniques
DE: 1610 Atmosphere (0315, 0325)
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
SC: Biogeosciences [B]
MN: 2004 AGU Fall Meeting