HR: 1340h
AN: A13D-1508    [Abstracts]
TI: The Darwin TCCON Site - CO2 Calibration and First Data
AU: * Deutscher, N M
EM: nmd03@uow.edu.au
AF: School of Chemistry University of Wollongong, Northfields Ave, Wollongong, NSW 2522, Australia
AU: Griffith, D W
EM: griffith@uow.edu.au
AF: School of Chemistry University of Wollongong, Northfields Ave, Wollongong, NSW 2522, Australia
AU: Keppel-Aleks, G
EM: gka@gps.caltech.edu
AF: Division of Geological and Planetary Sciences California Institute of Technology, 1200 E. California Blvd, Pasadena, CA 91125, United States
AU: Washenfelder, R A
EM: rebecca.washenfelder@noaa.gov
AF: Chemical Sciences Division Earth System Research Laboratory, NOAA, 325 Broadway St, Boulder, CO 80305, United States
AU: Wennberg, P O
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
AU: Wennberg, P O
EM: wennberg@gps.caltech.edu
AF: Division of Engineering and Applied Science California Institute of Technology, 1200 E. California Blvd, Pasadena, CA 91125, United States
AU: Toon, G C
EM: geoffrey.c.toon@jpl.nasa.gov
AF: NASA Jet Propulsion Laboratory California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, United States
AB: This paper presents the first measurements from the solar observatory deployed to Darwin, Australia in August 2005. The observatory is the second dedicated instrument in the Total Carbon Column Observing Network (TCCON). The first two years of column values are presented, as well as comparison to integrated in situ aircraft profiles obtained during the Tropical Warm Pool - International Cloud Experiment (TWP-ICE) in January - February 2006. Sites in TCCON will provide ground-based validation and calibration for upcoming space-based instruments, such as the Orbiting Carbon Observatory (OCO) and Greenhouse Gases Observing Satellite (GOSAT), which measure the same atmospheric quantities. The TCCON stations are calibrated against integrated columns measured from aircraft by instruments calibrated on the accepted WMO CO₂ scale. Two CO₂ microwindows are calibrated independently, and the correction factors are determined to be 1.0143 ± 0.0004 (fit ± 95% confidence interval) and 1.0152 ± 0.0003, respectively, for the 6228 cm^-1 and 6348 cm^-1 bands. These values are in good agreement with similar comparisons made at Park Falls, and show an improvement in the absolute calibration, due to improved CO₂ line parameters. The first two years of CO₂ data from the solar FTS are analysed for secular and seasonal trends in the column average mixing ratio. These are compared to some surface in situ data trends for the same period. The column data capture the secular trend as observed in surface in situ measurements, however, the seasonal cycle is dampened relative to the surface data illustrating the need for high precision measurements, but also the potential to remove rectifier effects.
DE: 0325 Evolution of the atmosphere (1610, 8125)
DE: 0394 Instruments and techniques
DE: 1640 Remote sensing (1855)
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting