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The Coupling of ClONO2, ClO, and NO2 in the Lower Stratosphere From in Situ Observations Using the NASA ER-2 AircraftThe first in situ measurements of ClONO2 in the lower stratosphere, acquired using the NASA ER-2 aircraft during the Polar Ozone Loss in the Arctic Region in Summer (POLARIS) mission, are combined with simultaneous measurements of ClO, NO2, temperature, pressure, and the calculated photolysis rate coefficient (J(sub ClONO2)) to examine the balance between production and loss of ClONO2. The observations demonstrate the ClONO2 photochemical steady state measurement, [ClONO2](sup PSS) = k[ClO][No2]/J(sub ClONO2), is in good agreement with the direct measurement, [ClONO2](sup MEAS). For the bulk of the data (80%), where T > 220 K and latitudes > 45 N, [ClONO2](sup PPS) = 1.15 +/- 0.36(1-sigma)[ClONO2](sup MEAS), while for T< 220 K and latitudes < 45 N, the result is somewhat less at 1.01 +/- 0.30. The cause of the temperature and/or latitude trend is unidentified. These results are independent of solar zenith angle and air density, thus there is no evidence in support of a pressure-dependent quantum yield for photodissociation of ClONO2 at wavelengths > 300 nm. These measurements confirm the mechanism by which active nitrogen (NOx = NO + NO2) controls the abundance of active chlorine (Clx = ClO + Cl) in the stratosphere.
Document ID
20010064217
Acquisition Source
Headquarters
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Stimpfle, R. E.
(Harvard Univ. Cambridge, MA United States)
Cohen, R. C.
(California Univ. Berkeley, CA United States)
Bonne, G. P.
(Harvard Univ. Cambridge, MA United States)
Voss, P. B.
(Harvard Univ. Cambridge, MA United States)
Perkins, K. K.
(Harvard Univ. Cambridge, MA United States)
Koch, L. C.
(Colorado Univ. Boulder, CO United States)
Anderson, J. G.
(Harvard Univ. Cambridge, MA United States)
Salawitch, R. J.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA United States)
Gao, R. S.
(National Oceanic and Atmospheric Administration Boulder, CO United States)
Date Acquired
August 20, 2013
Publication Date
November 20, 1999
Publication Information
Publication: Journal of Geophysical Research
Publisher: American Geophysical Union
Volume: 104
Issue: D21
ISSN: 0148-0227
Subject Category
Geophysics
Report/Patent Number
Paper-1999JD900288
Distribution Limits
Public
Copyright
Other

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