HR: 0800h
AN: A51D-0802    [Abstracts]
TI: Simple Tropospheric Ozone Derivation From TOMS: Insight Into Tropical Latitudinal Distribution
AU: * Na, S
EM: sunmi@pusan.ac.kr
AF: Pusan National University, Jangjeon-dong, Geumjeong-gu, Busan, 609-735 Korea, Republic of
AU: Kim, J H
EM: jaekim@pusan.ac.kr
AF: Pusan National University, Jangjeon-dong, Geumjeong-gu, Busan, 609-735 Korea, Republic of
AU: Newchurch, M J
EM: mike@nsstc.uah.edu
AF: University of Alabama in Huntsville, National Space Science and Technology Center 320 Sparkman Drive, Huntsville, AL 35805 United States
AB: The latitudinal total ozone distribution subtracted from the background tropospheric ozone column over the Pacific Ocean, a pollution-free region, (hereafter the ›r­’Zonal Mean›r­_ method) shows good agreement with the latitudinal stratospheric ozone distribution from the CCD. The latitudinal tropospheric ozone distribution from the CCD method, with a persistent maximum over the southern tropical Atlantic, is also seen in the latitudinal tropospheric ozone distribution from the Zonal Mean method. This approach suggests that the sophisticated CCD method can be replaced by the simple Zonal Mean method. However, several features are different from the distribution from satellite-derived products of fire counts, MOPITT CO, TOMS AI, ozone from GEOS-CHEM model, and the Scan Angle Method results in DJF and MAM periods. For investigation for this discrepancy in boreal winter and spring, we compare the latitudinal ozone distribution from the CCD and Zonal Mean method by using the SAGE measurements and the SHADOZ ozonesoundings based on the assumption of zonally invariant stratospheric ozone. In spite of the same negative N-S gradient for DJF, the N-S gradient in stratospheric ozone from the CCD and the Zonal Mean method is a 5 DU smaller than that from the TOMS-SAGE and the TOMS-ozonesonde methods. Because the relatively lower stratospheric ozone in the southern tropical Atlantic is subtracted from TOMS total ozone, the CCD and Zonal Mean method-derived tropospheric ozone present a peak over the southern tropics. On the other hand, the TOMS-SAGE and the TOMS-ozonesonde method products exhibit a maximum over the northern tropical Atlantic. In the MAM period, the latitudinal distribution in the TOMS-ozonesonde-derived tropospheric ozone shows a higher ozone amount over the northern tropical Atlantic than the southern Atlantic due to the negative N-S gradient in stratospheric ozone. Therefore, the latitudinal tropospheric ozone distribution depends on the latitudinal stratospheric ozone distribution even in the tropics.
DE: 0315 Biosphere/atmosphere interactions
DE: 0345 Pollution--urban and regional (0305)
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