February 28, 2007
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Published July 1988 through June 1999
FROM VOLUME 2, NUMBER 10, OCTOBER 1989
"A Model Study of the Stratospheric Budget of Odd Nitrogen,
Including Effects of Solar Cycle Variations," M.R. Legrand (Lab.
Glaciologie & Geophys. de l'Environ., BP 96, 38402 Saint Martin d'Hères
Cedex, France), F. Stordal et al., Tellus, 41B(4), 413-426, Sep.
Uses a two-dimensional diabatic circulation model of the stratosphere and
the troposphere to study the budget of total odd nitrogen (NOy) and to simulate
the response of odd oxygen and nitrogen species to the 11-year solar cycle
variations. Results are discussed in terms of influence regions of the various
NOy production processes, including surface sources (anthropogenic sources, soil
exhalation), lightning, N2O oxidation, galactic cosmic rays and high-latitude
input from the thermosphere and mesosphere. Found that the N2O oxidation process
is the dominant odd nitrogen source throughout the stratosphere, but NOy
produced within the thermosphere and transported through the stratopause at high
latitude during winter may affect NOy distribution, particularly during periods
of large solar activity.
"Stratospheric HBr Mixing Ratio Obtained from Far Infrared Emission
Spectra," J.H. Park (Atmos. Sci. Div., NASA Langley Res. Ctr., Hampton VA
23665), B. Carli, A. Barbis, Geophys. Res. Lett., 16(8),
787-790, Aug. 1989.
Identifies emission features of HBr isotopes in high resolution emission
spectra obtained with a balloon-borne Fourier transform spectrometer in the
spring of 1979 at 32° N latitude. The volume mixing ratio retrieved from the
average spectrum is 2.0 x 10-11, which is assumed to be constant above 28 km,
with an uncertainty of 35%. Results confirm recent observational evidence of the
existence of stratospheric HBr at levels larger than previously reported.
"Balloon Borne Observations of PSCs, Frost Point, Ozone and Nitric
Acid in the North Polar Vortex," J.M. Rosen (Dept. Phys. & Astron.,
Univ. Wyoming, Laramie WY 82071), S.J. Oltmans, W.F. Evans, ibid.,
Studied polar stratospheric clouds (PSCs) at Alert, Northwest Territories,
during January and February of 1989 with a new balloon borne instrument called a
backscattersonde. Type I PSCs were observed at temperatures and pressures
generally consistent with present vapor pressure models of HNO3/H2O condensate,
but some noticeable inconsistencies exist. Suggests that these apparent
problems, as well as some characteristic peculiarities in the PSC profiles,
could be explained by the presence of two phases of the HNO3/H2O condensate.
"Examination of Stratospheric Ozone Photochemistry in Light of
Recent Data," M. Natarajan (ST Sys. Corp., 28 Research Dr., Hampton VA
23666), L.B. Callis, ibid., 16(5), 473-476, May 1989.
Examines the consistency of stratospheric ozone photochemistry using data
from ATMOS and LIMS experiments in a photochemical model. When ATMOS data were
used to constrain the levels of odd nitrogen and odd chlorine in the model, it
yielded O3 mixing ratios that are in good agreement with observations. The
updated model has also been used in conjunction with the LIMS data to simulate
the stratospheric photochemistry corresponding to the 1979 time period.
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