HR: 1340h
AN: A33A-0137    [Abstracts]
TI: First Look at the SO$_2$ Index Calculated from OMI Observations
AU: * Yang, K
EM: Kai.Yang.1@gsfc.nasa.gov
AF: Science Application and Systmes Inc, 10210 GREENBELT RD.,SUITE 400, LANHAM, MD 20706 United States
AU: Bhartia, P K
EM: Pawan.Bhartia@nasa.gov
AF: NASA Goddard Space Flight Center, GSFC/NASA, Code 916, GREENBELT, MD 20706
AU: Krotkov, N A
EM: krotkov@tparty.gsfc.nasa.gov
AF: JECT/GEST, UMBC, 1000 Hilltop Circle, Baltimore, MD 21250
AU: Krueger, A J
EM: akrueger@umbc.edu
AF: JECT/GEST, UMBC, 1000 Hilltop Circle, Baltimore, MD 21250
AU: Luo, S
EM: Shifang_Luo@ssaihq.com
AF: Science Application and Systmes Inc, 10210 GREENBELT RD.,SUITE 400, LANHAM, MD 20706 United States
AB: We have applied the TOMS total ozone algorithm to the UV spectral radiance measurements from the Ozone Monitoring Instrument (OMI) onboard the recently launched EOS Aura spacecraft. In the UV2 channel (306-370 nm) OMI makes daily global hyper-spectral (spectral resolution of 0.45 nm, and spectral sampling of 0.15 nm/pixel) radiance measurements with a nadir resolution of 13 km x 24 km. Residuals in the UV2 spectral region are calculated as the difference between the measured and the computed theoretical radiances that account for the effects of ozone, Ring, and surface reflectivity. Analysis of these residuals is very useful in detecting instrument artifacts and calibration errors as well as unusual atmospheric conditions. Sulfur dioxide (SO$_2$) has a strong absorption in the wavelength range 306-340 nm. Residuals in this wavelength range show distinctive features if a significant amount of SO$_2$ is present in the atmosphere, such as in the case of volcanic clouds or air pollution. However, SO$_2$ is absent over most of the Earth and residuals are sensitive diagnostics of instrument performance. For this study, we will show maps of SO$_2$ index, defined as the residual differences at a pair of wavelengths, like 311.85 nm and 313.2 nm, which have large differential sensitivity to the SO$_2$ absorption.
DE: 0340 Middle atmosphere--composition and chemistry
DE: 0370 Volcanic effects (8409)
DE: 0399 General or miscellaneous
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting