HR: 0800h
AN: A51D-0735 [Abstracts]
TI: TES observations of tropospheric ozone as a greenhouse gas
AU: * Worden, H M
EM: hmw@ucar.edu
AF: Jet Propulsion Laboratory, CalTech, 4800 Oak Grove Dr., Pasadena, CA 91109, United
States
AU: Bowman, K W
EM: Kevin.Bowman@jpl.nasa.gov
AF: Jet Propulsion Laboratory, CalTech, 4800 Oak Grove Dr., Pasadena, CA 91109, United
States
AU: Worden, J R
EM: John.Worden@jpl.nasa.gov
AF: Jet Propulsion Laboratory, CalTech, 4800 Oak Grove Dr., Pasadena, CA 91109, United
States
AU: Eldering, A
EM: Annmarie.Eldering@jpl.nasa.gov
AF: Jet Propulsion Laboratory, CalTech, 4800 Oak Grove Dr., Pasadena, CA 91109, United
States
AB:
We present satellite observations of the downward radiative flux from tropospheric ozone, for cloud free ocean
conditions. This analysis uses infrared (IR) radiance spectra, integrated over the 9.6 micron ozone band between
985 to 1080 cm-1, and ozone profile retrievals from the Tropospheric Emission Spectrometer (TES) on EOS-Aura.
We examine the sensitivity of the outgoing longwave radiation (OLR) in the 9.6 micron band to upper tropospheric
ozone and water vapor by separating the data into hemispherical and sea-surface temperature (SST) ranges. For
2006 data, we estimate an annual average downward flux for upper tropospheric ozone of 0.48 ± 0.13 W/m2 with
a standard deviation of 0.24 W/m2 for the latitude range between 45°S to 45°N. This estimate includes natural
and anthropogenic ozone sources and is higher than the 2007 IPCC average for climate model estimates of
anthropogenic tropospheric ozone radiative forcing of 0.35 W/m2. We also observe that water vapor dominates
the clear-sky ocean variability of the outgoing IR radiation in the 9.6 micron ozone band for SSTs higher than 299
K, consistent with the "super greenhouse effect". This underscores the importance of chemistry-climate coupling
in forcing predictions for tropospheric ozone.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0360 Radiation: transmission and scattering
DE: 0365 Troposphere: composition and chemistry
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting