HR: 1340h
AN: A33A-0125    [Abstracts]
TI: Tropospheric Ozone Retrievals for TES Validations at the ARM sites
AU: * Shephard, M W
EM: mshep@aer.com
AF: Atmospheric and Environmental Research, Inc., 131 Hartwell Avenue, Lexington, MA 02421 United States
AU: Clough, S A
EM: sclough@aer.com
AF: Atmospheric and Environmental Research, Inc., 131 Hartwell Avenue, Lexington, MA 02421 United States
AU: Delamere, J S
EM: jdelamer@aer.com
AF: Atmospheric and Environmental Research, Inc., 131 Hartwell Avenue, Lexington, MA 02421 United States
AU: Cady-Pereira, K E
EM: kcadyper@aer.com
AF: Atmospheric and Environmental Research, Inc., 131 Hartwell Avenue, Lexington, MA 02421 United States
AU: Kulawik, S S
EM: Susan.S.Kulawik@jpl.nasa.gov
AF: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr., Pasadena, CA 91109 United States
AU: Logan, J A
EM: jal@io.harvard.edu
AF: Harvard University, Department of Earth and Planetary Science, Pierce Hall, 29 Oxford St., Cambridge, MA 02138-2901 United States
AB: A fundamental objective of the Tropospheric Emission Spectrometer (TES) deployed on the AURA platform, is the production of global maps of tropospheric ozone. The retrieval of troposphere information is dependent on the fact that the line shapes in the stratosphere and troposphere are different: Doppler in the stratosphere and Lorentz in the troposphere. As a consequence, the radiometric information describing the distribution of ozone in the troposphere is located in the parts of the spectrum lying between the strong ozone lines. The retrieval of the tropospheric information from space-borne sensors is also highly susceptible to systematic errors due to the nature of the relevant inverse problem. Errors in the forward model, in the characterization of the instrument function, in the photometry of the measurement and in the background fields (e.g., temperature, water vapor and surface properties) can give rise to unacceptable errors in the retrieval. Therefore, the validation of the TES tropospheric ozone retrievals on a continuous basis is very desirable. Presented is an approach to continuously retrieve tropospheric ozone column amounts at the three DoE Atmospheric Radiation Measurement Climate Research Facility (ACRF) sites utilizing spectral downwelling radiation measurements from the Atmospheric Emittance Radiometric Interferometer (AERI). The ACRF sites instrumented with an AERI interferometer are: North Slope of Alaska (NSA), Southern Great Plains (SGP), and Tropical Western Pacific (TWP) on the island of Nauru. For these ground-based measurements, the radiation from the tropospheric ozone is not impeded by the stratospheric component. The retrieval is robust under conditions of clear sky and is also expected to be useful for validating TES retrievals under conditions of thin clouds, e.g. thin cirrus. Cloud statistics show that for TES overpasses the skies are either clear or have a thin cloud cover about 50% of the time, except for the TWP site. During normal TES global survey mode there will be 4 to 30 opportunities within each 16-day cycle for an AURA overpass of an ACRF site. In addition there are special TES observation surveys that approximately double the ARCF viewing. Following closely the maximum likelihood least squares retrieval method implemented by TES, preliminary tropospheric ozone column retrieval results are presented showing that two pieces of information: tropospheric ozone column amounts and improve profile information in the upper troposphere/lower stratosphere can be retrieved on a continuous basis at the SGP ACRF site. Future ozonesondes launches at the ACRF sites will also be used to simultaneously validate both the TES and AERI ozone retrievals.
DE: 1640 Remote sensing
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0365 Troposphere--composition and chemistry
DE: 0368 Troposphere--constituent transport and chemistry
DE: 0394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting