In:
Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 95, No. D7 ( 1990-06-20), p. 10179-10192
Abstract:
During August and September 1986, 11 aircraft flights were made over the eastern Pacific Ocean and continental United States. The suite of observations included simultaneous measurements of peroxyacetyl nitrate (PAN) and active nitrogen (NO x = NO + NO 2 ). At altitudes of 4.5–6.1 km in the middle free troposphere, PAN was usually 5–6 times NO x in maritime air masses and 2–4 times NO x in continental air masses. In air masses of tropical origin, or in the marine boundary layer, both PAN and NO x were typically less than 20–30 parts per trillion by volume, and the PAN to NO x ratio was less than one. The observations show that PAN can be a major component of the odd nitrogen budget in the middle free troposphere and strongly reinforce earlier views that the abundance is mainly governed by long‐range transport processes including formation during transport and continental boundary layer to free tropospheric exchange of PAN and its precursors. Unlike reservoir HNO 3 , PAN can be transformed to active nitrogen and peroxy radicals by a variety of physical atmospheric processes that lead to air mass warming. Since NO x plays a critical role in determining photochemical O 3 production, which in turn determines the oxidative power of the atmosphere, the observed large ratios of reservoir PAN to active NO x imply an important photochemical and dynamical role for PAN in the eastern Pacific remote free troposphere.
Type of Medium:
Online Resource
ISSN:
0148-0227
DOI:
10.1029/JD095iD07p10179
Language:
English
Publisher:
American Geophysical Union (AGU)
Publication Date:
1990
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