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Temperature dependence of the HNO3 UV absorption cross sectionsThe temperature dependence of the HNO3 absorption cross sections between 240 and 360 K over the wavelength range 195 to 350 nm has been measured using a diode array spectrometer. Absorption cross sections were determined using both (1) absolute pressure measurements at 298 K and (2) a dual absorption cell arrangement in which the absorption spectrum at various temperatures is measured relative to the room temperature absorption spectrum. The HNO3 absorption spectrum showed a temperature dependence which is weak at short wavelengths but stronger at longer wavelengths which are important for photolysis in the lower stratosphere. The 298 K absorption cross sections were found to be larger than the values currently recommended for atmospheric modeling (DeMore et al., 1992). Our absorption cross section data are critically compared with the previous measurements of both room temperature and temperature-dependent absorption cross sections. Temperature-dependent absorption cross sections of HNO3 are recommended for use in atmospheric modeling. These temperature dependent HNO3 absorption cross sections were used in a two-dimensional dynamical-photochemical model to demonstrate the effects of the revised absorption cross sections on loss rate of HNO3 and the abundance of NO2 in the stratosphere.
Document ID
19950049215
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Burkholder, James B.
(NOAA, Boulder, CO United States)
Talukdar, Ranajit K.
(NOAA, Boulder, CO United States)
Ravishankara, A. R.
(NOAA, Boulder, CO United States)
Solomon, Susan
(NOAA, Boulder, CO 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
95A80814
Distribution Limits
Public
Copyright
Other

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