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Wuebbles, Donald J. Wei, Chu-Feng 2015-09-28T14:52:18Z 2015-09-28T14:52:18Z 10000-01-01 2002 2002 Significant seasonal variations in the concentrations of several trace gases were observed in the southern tropical Pacific during the PEM-TROPICS-A (PT-A) and PEM-TROPICS-B (PT-B) campaigns. In the second part of this thesis, a 3D CTM, MOZART, is used to investigate the ozone budget and identify its controlling factors over this region. The model reproduced the main features of the observed seasonal variation in ozone and CO. The ozone burden during the PT-A was larger due to the transport of ozone into the central Pacific middle-troposphere from the west, whereas a net outflow of ozone from this region to the east resulted in a reduction of ozone burden during the PT-B period. Transport of ozone from the Northern Hemisphere into this region was found to be much larger during the PT-B period compared to the PT-A period. Results from MOZART were also used to generate correlations in the ratios of non-methane hydrocarbons and the variability in their mixing ratio distributions as a function of their local lifetimes. Comparisons between this correlation with experimental observations enabled us to identify a source-receptor relationship over the southern tropical Pacific region. Made available in DSpace on 2015-09-28T14:52:18Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 3044257.pdf: 9352113 bytes, checksum: f2ebc2769794cd315076fee8785a87ac (MD5) Previous issue date: 2002 Embargo set by: Seth Robbins for item 87238 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 226 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2002. http://hdl.handle.net/2142/85957 (MiAaPQ)AAI3044257 eng Physics, Atmospheric Science A Model Analysis of Anthropogenic Influences on Ozone and Related Species: The Interaction of Transport and Chemistry text Atmospheric Sciences Atmospheric Sciences University of Illinois at Urbana-Champaign Dissertation Ph.D.