HR: 09:00h
AN: H31A-05    [PDF]
TI: Feasibility of Sensing Tropospheric Ozone with MODIS 9.6 $\mu$ Observations
AU: * Cuddapah, P
EM: Prabhakara.Cuddapah-1@nasa.gov
AF: NASA/Goddard Space Flight Center, Mail Code 913, Greenbelt, MD 20771 United States
AU: Iacovazzi, R
EM: raijr@crces.org
AF: Center for Research on the Changing Earth System, 10211 Wincopin Circle, Suite 240, Columbia, MD 21044 United States
AU: Yoo, J M
EM: yjm@ewha.ac.kr
AF: Ewha Womens University, Dept. of Science Education, Seoul, 120-750 Korea, Republic of
AB: With the infrared observations made by the Moderate Resolution Imaging Spectrometer (MODIS) on board the EOS-Aqua satellite, which include the 9.73$\mu$ channel, a method is developed to deduce horizontal patterns of tropospheric ozone in cloud free conditions on a scale of about 100 km. It is assumed that on such small scale, at a given instant, horizontal changes in stratospheric ozone are small compared to that in the troposphere. From theoretical simulations it is found that uncertainties in the land surface emissivity and the vertical thermal stratification in the troposphere can lead to significant errors in the inferred tropospheric ozone. Because of this reason in order to derive horizontal patterns of tropospheric ozone in a given geographic area a tuning of this method is necessary with the help of a few dependent cases. After tuning, this method is applied to independent cases of MODIS data taken over Los Angeles basin in cloud free conditions to derive horizontal distribution of ozone in the troposphere. Preliminary results indicate that the derived patterns of ozone resemble crudely the patterns of surface ozone reported by EPA.
DE: 1899 General or miscellaneous
SC: Hydrology [H]
MN: 2003 Fall Meeting