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The impact of U.S. continental outflow on ozone and aerosol distributions over the western AtlanticAircraft measurements of selected trace gas species, aerosols, and meteorological parameters were performed in the lower troposphere off the U.S. east coast during August and September 1989 as part of the NASA Global Tropospheric Experiment (GTE) Chemical Instrumentation Test and Evaluation (CITE 3) expedition. In this paper, we examine these data to assess the impact of continental outflow on western Atlantic O3 and small aerosol budgets. Results show that mixed layer (ML) O3 concentrations and small aerosol number densities (Np) were enhanced by factors of 3 and 6, respectively, within air masses of predominantly continental origin compared with clean maritime background air. These enhancements exhibited a marked altitude dependence, declining rapidly above the ML to the point where only slight to moderate differences in O3 and Np, respectively, were notable above 2.4 km. Within continentally influenced ML's, both O3 and Np were correlated with CO, exhibiting linear regression slopes averaging 0.4 ppbv (O3)/ppbv(CO) for O3 and 7.7 (particles/cc)/ppbv(CO) for Np and indicating a primarily anthropogenic origin for the observed enhancement of these species. Comparisons between profiles in continental and background maritime air masses suggest that photochemical production below 1.4-km altitude adds over 10% to western Atlantic tropospheric column O3 abundance in continental outflow regimes. For aerosols, eastward advection of low-level continental air contributes an average net flux of 2.8 metric tons of submicron (accumulation mode) particles per kilometer of shoreline per day to the western Atlantic troposphere.
Document ID
19950049256
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Anderson, B. E.
(NASA Langley Research Center Hampton, VA, United States)
Gregory, G. L.
(NASA Langley Research Center Hampton, VA, United States)
Barrick, J. D. W.
(NASA Langley Research Center Hampton, VA, United States)
Collins, J. E., Jr.
(Science and Technology Corporation Hampton, VA, United States)
Sachse, G. W.
(NASA Langley Research Center Hampton, VA, United States)
Bagwell, D.
(NASA Langley Research Center Hampton, VA, United States)
Shipham, M. C.
(NASA Langley Research Center Hampton, VA, United States)
Bradshaw, J. D.
(Georgia Institute of Technology, Atlanta, GA United States)
Sandholm, S. T.
(Georgia Institute of Technology, Atlanta, GA United States)
Date Acquired
August 16, 2013
Publication Date
December 20, 1993
Publication Information
Publication: Journal of Geophysical Research
Volume: 98
Issue: D12
ISSN: 0148-0227
Subject Category
Environment Pollution
Accession Number
95A80855
Distribution Limits
Public
Copyright
Other

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