HR: 09:15h
AN: A21G-06    [Abstracts]
TI: The Timing of the Turn-around of Mid-latitude Ozone Trends
AU: * Weatherhead, E C
EM: betsy.weatherhead@noaa.gov
AF: CIRES, U. Colorado 325 Broadway, Boulder, CO 80305 United States
AU: Petropavlovski, I
EM: irina.petro@noaa.gov
AF: CIRES, U. Colorado 325 Broadway, Boulder, CO 80305 United States
AU: Oltmans, S J
EM: samuel.j.oltmans@noaa.gov
AF: NOAA - CMDL, 325 Broadway, Boulder, CO 80305 United States
AB: Mid-latitude total column ozone appears to have leveled off since the mid-1990's. The timing of this leveling off is important for attribution reasons. The timing is also critical for a variety of trend detection techniques used in detecting ozone turn-around. This presentation summarizes approaches used to estimate the timing of the turn-around in mid-latitude stratospheric ozone. A number of sources including atmospheric models, ozone data and trace gas data are used giving a range of estimates. The results of this work show that ozone data alone may not be the best source of information for determining the date of turn-around in mid-latitude ozone data. The timing of the turn-around affects the derived trends and the uncertainty in the timing of the turn-around affects the uncertainty of the derived trends.
DE: 0315 Biosphere/atmosphere interactions (0426, 1610)
DE: 0340 Middle atmosphere: composition and chemistry
DE: 1616 Climate variability (1635, 3305, 3309, 4215, 4513)
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005