HR: 11:20h
AN: A51G-04    [PDF]
TI: Data Assimilation of SAGE II Data: Solar and Volcanic Effects
AU: * Geller, M A
EM: Marvin.Geller@sunysb.edu
AF: Institute for Terrestrial and Planetary Atmospheres, Stony Brook University, Stony Brook, NY 11794-5000 United States
AU: Smyshlyaev, S P
EM: smyshl@meteo.rshmi.spb.ru
AF: Russian State Hydrometeorological University, Maloohtinsky 98, St. Petersburg, 195196 Russian Federation
AU: Zhou, X
EM: xlzhou@atmsci.msrc.sunysb.edu
AF: Institute for Terrestrial and Planetary Atmospheres, Stony Brook University, Stony Brook, NY 11794-5000 United States
AB: In an earlier published paper, we showed the data assimilation results for ozone using the SAGE II solar occultation data and a two-dimensional chemistry-transport model. In this earlier work, no solar cycle UV dependence was included in the model. Here, we show results using this same model, but now including solar cycle UV variations. These new results are in better agreement with the independent TOMS data, particularly during the middle and late 1980s. The new results also show lesser episodic ozone decreases in the lower stratosphere that are associated with the El Chichon (3% compared to 4%) and Mt. Pinatubo (6% compared to 9%) eruptions enhancements in stratospheric aerosol. Comparisons are shown between ozone profiles from the data assimilation and from the SAGE II data to illustrate both the "goodness" of fit of the assimilation ozone profiles to the input data and also to clearly see the differences in the signature of the volcanic and solar effects on the ozone profiles.
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0340 Middle atmosphere--composition and chemistry
DE: 0341 Middle atmosphere--constituent transport and chemistry (3334)
DE: 0370 Volcanic effects (8409)
DE: 0394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting