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Atmospheric peroxyacetyl nitrate measurements over the Brazilian Amazon Basin during the wet season - Relationships with nitrogen oxides and ozoneAn analysis is presented on the distribution and variability of PAN as well as its relationship with measured chemical and meteorological parameters. The chemicals of most interest for which measurements were available are PAN, NO(x), O3, CO, and C2Cl4. PAN was measured by the electron capture gas chromatographic technique, and the technique for calibrations and measurements are detailed. Data show that significant concentrations of PAN (5-125 ppt) are present during the wet season and this PAN is 1-5 times more abundant than NO(x). PAN levels at different atmospheric locations are discussed, and it is noted that PAN shows evidence of a possible latitudinal gradient in the free troposphere, with values falling rapidly from the northern midlatitudes toward the equator. High correlations between O3 and PAN levels suggest that nonmethane hydrocarbons may contribute significantly to high O3 in the free troposphere. Evidence indicates that virtually all of the NO(x) above 4 km could result from PAN decomposition.
Document ID
19900065065
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Singh, H. B.
(NASA Ames Research Center Moffett Field, CA, United States)
Herlth, D.
(NASA Ames Research Center Moffett Field, CA, United States)
O'Hara, D.
(San Jose State Foundation Moffett Field, CA, United States)
Salas, L.
(SRI International Menlo Park, CA, United States)
Torres, A. L.
(NASA Wallops Flight Center Wallops Island, VA, United States)
Gregory, G. L.
(NASA Ames Research Center Moffett Field, CA, United States)
Sachse, G. W.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 14, 2013
Publication Date
September 20, 1990
Publication Information
Publication: Journal of Geophysical Research
Volume: 95
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
90A52120
Distribution Limits
Public
Copyright
Other

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