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Photochemical ozone production in tropical squall line convection during NASA Global Tropospheric Experiment/Amazon Boundary Layer Experiment 2AThe role of convection was examined in trace gas transport and ozone production in a tropical dry season squall line sampled on August 3, 1985, during NASA Global Tropospheric Experiment/Amazon Boundary Layer Experiment 2A (NASA GTE/ABLE 2A) in Amazonia, Brazil. Two types of analyses were performed. Transient effects within the cloud are examined with a combination of two-dimensional cloud and one-dimensional photochemical modeling. Tracer analyses using the cloud model wind fields yield a series of cross sections of NO(x), CO, and O3 distribution during the lifetime of the cloud; these fields are used in the photochemical model to compute the net rate of O3 production. At noon, when the cloud was mature, the instantaneous ozone production potential in the cloud is between 50 and 60 percent less than in no-cloud conditions due to reduced photolysis and cloud scavenging of radicals. Analysis of cloud inflows and outflows is used to differentiate between air that is undisturbed and air that has been modified by the storm. These profiles are used in the photochemical model to examine the aftereffects of convective redistribution in the 24-hour period following the storm. Total tropospheric column O3 production changed little due to convection because so little NO(x) was available in the lower troposphere. However, the integrated O3 production potential in the 5- to 13-km layer changed from net destruction to net production as a result of the convection. The conditions of the August 3, 1985, event may be typical of the early part of the dry season in Amazonia, when only minimal amounts of pollution from biomass burning have been transported into the region.
Document ID
19910042426
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Pickering, Kenneth E.
(Applied Research Corp. Landover, MD, United States)
Thompson, Anne M.
(Applied Research Corp. Landover, MD, United States)
Tao, Wei-Kuo
(Applied Research Corp. Landover, MD, United States)
Simpson, Joanne
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Scala, John R.
(NASA Goddard Space Flight Center Greenbelt, MD; Virginia, University, Charlottesville, United States)
Date Acquired
August 14, 2013
Publication Date
February 20, 1991
Publication Information
Publication: Journal of Geophysical Research
Volume: 96
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
91A27049
Distribution Limits
Public
Copyright
Other

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