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Record Details

Record 45 of 33439
African Equatorial and Subtropical Ozone Plumes: Recurrences Timescales of the Brown Cloud Trans-African Plumes and Other Plumes
Author and Affiliation:
Chatfield, Robert B.(NASA Ames Research Center, Moffett Field, CA, United States)
Thompson, Anne M.(NASA Goddard Space Flight Center, Greenbelt, MD, United States)
Guan, Hong(Bay Area Environmental Research Inst., Moffett Field, CA, United States)
Witte, Jacquelyn C.(Science Systems and Applications, Inc., Greenbelt, MD, United States)
Abstract: We have found repeated illustrations in the maps of Total Tropospheric Ozone (TTO) of apparent transport of ozone from the Indian Ocean to the Equatorial Atlantic Ocean. Most interesting are examples that coincide with the INDOEX observations of late northern winter, 1999. Three soundings associated with the SHADOZ (Southern Hemisphere Additional Ozonesondes) network help confirm and quantify degree of influence of pollution, lightning, and stratospheric sources, suggesting that perhaps 40% of increased Atlantic ozone could be Asian pollution during periods of maximum identified in the TTO maps. We outline recurrent periods of apparent ozone transport from Indian to Atlantic Ocean regions both during and outside the late-winter period. These are placed in the context of some general observations about factors controlling recurrence timescales for the expression of both equatorial and subtropical plumes. Low-level subtropical plumes are often controlled by frontal systems approaching the Namib coast; these direct mid-level air into either easterly equatorial plumes or westerly mid- troposphere plumes. Equatorial plumes of ozone cross Africa on an easterly path due to the occasional coincidence of two phenomena: (1) lofting of ozone to mid and upper levels, often in the Western Indian Ocean, and (2) the eastward extension of an Equatorial African easterly jet.
Publication Date: Jan 01, 2004
Document ID:
20040068392
(Acquired Jun 07, 2004)
Subject Category: METEOROLOGY AND CLIMATOLOGY
Document Type: Preprint
Meeting Information: American Geophysical Union Spring Meeting; 17-21 May 2004; Montreal; Canada
Meeting Sponsor: American Geophysical Union; United States
Contract/Grant/Task Num: 21-622-55-54
Financial Sponsor: NASA Ames Research Center; Moffett Field, CA, United States
Organization Source: NASA Ames Research Center; Moffett Field, CA, United States
Description: 1p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: OZONE; PLUMES; TROPOSPHERE; POLLUTION TRANSPORT; AFRICA; SOUNDING; GAS TRANSPORT
Availability Source: Other Sources
Availability Notes: Abstract Only
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