HR: 0830h
AN: A21D-1000    [PDF]
TI: Analysis of global trends and variability in ozone using a combined TOMS and GOME data base
AU: Bodeker, G E
EM: g.bodeker@niwa.co.nz
AF: National Institute of Water and Atmospheric Research, Private Bag 50061, Omakau, CO 9182 New Zealand
AU: * Connor, B J
EM: b.connor@niwa.co.nz
AF: National Institute of Water and Atmospheric Research, Private Bag 50061, Omakau, CO 9182 New Zealand
AU: Petrie, S
EM: s.petrie@niwa.co.nz
AF: National Institute of Water and Atmospheric Research, Private Bag 50061, Omakau, CO 9182 New Zealand
AU: Shiona, H
EM: s.shiona@niwa.co.nz
AF: National Institute of Water and Atmospheric Research, Private Bag 50061, Omakau, CO 9182 New Zealand
AB: A global assimilated total column ozone data set has been created by combining total column ozone measurements from four TOMS experiments flown on the Nimbus 7, Meteor 3, Earth Probe and ADEOS satellites, together with the Global Ozone Monitoring Experiment (GOME) flown on ERS-2. Comparisons between TOMS data and measurements from the ground-based Dobson spectrophotometer network are used to remove offsets and drifts in the Nimbus 7 and Earth Probe satellite data. Statistical model fits to Nimbus 7 and Meteor 3 differences are then used to adjust the Meteor 3 TOMS data. Adjusted Earth Probe TOMS data are similarly used to correct ADEOS TOMS and GOME data. This data set was used in the most recent WMO/UNEP Scientific Assessment of Ozone Depletion (2002) and has recently been updated to the end of 2002, incorporating new (version 8) Nimbus 7 and Earth Probe TOMS data sets as well as the GOME assimilated ozone fields produced by KNMI in The Netherlands. Intercomparisons between these various data sets and the Dobson network will be presented. These data have been used as input to a linear least squares regression model incorporating terms for an offset, linear trend, and influence by the QBO, solar cycle and ENSO, as well as the El Chichon and Mt Pinatubo volcanic eruptions. Seasonal variability in each of these coefficients is expanded using Fourier components. This model has been applied to the assimilated total column ozone data set for a number of periods and trend results over different periods will be compared. The applicability of such statistical models for understanding long-term changes in ozone will be discussed. The data base has also been used to update indices of Antarctic ozone depletion such as the size of the Antarctic ozone hole, the ozone mass deficit within the Antarctic vortex, and annual minimum ozone values within the ozone hole. These will be presented for the entire period (1979 to 2002).
DE: 0325 Evolution of the atmosphere
DE: 0340 Middle atmosphere--composition and chemistry
DE: 0933 Remote sensing
DE: 1640 Remote sensing
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting