February 28, 2007
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Global Climate Change Digest
A Guide to Information on Greenhouse Gases and Ozone Depletion
Published July 1988 through June 1999
FROM VOLUME 10, NUMBER 7, JULY 1997
OZONE DEPLETION: AIRCRAFT IMPACTS
"On the Possible Role of Aircraft-Generated Soot in the Middle
Latitude Ozone Depletion," S. Bekki (Dept. Chem., Univ. Cambridge,
Lensfield Rd., Cambridge CB2 1EW, UK.; e-mail: email@example.com), J.
Geophys. Res., 102(D9), 10,751-10,758, May 20, 1997.
Recent 1-D models calculations suggested that heterogeneous chemistry on
black carbon could play a major role in stratospheric chemistry. Here, a 2-D
aerosol/soot photochemical model simulates realistically the stratospheric
global distribution of black soot, and also reproduces a large part of the lower
stratospheric ozone trend observed at northern middle latitudes. However,
results are sensitive to the assumed ozone uptake rate on soot, which is still
"The Role of Sulfur Emissions in Volatile Particle Formation in Jet
Aircraft Exhaust Plumes," J. Kärcher (Univ. München,
Hohenbachernstr. 22, D-85354 Freising, Ger.), D.W. Fahey, Geophys. Res.
Lett., 24(4), 389-392, Feb. 15, 1997.
Results of a comprehensive model are linked with observations of large
numbers of nanometer-sized aerosols made in the nascent plume of a Concorde
aircraft, providing strong evidence that high levels of SO3 in the plume are
required to explain the particles. This suggests the need to limit SO3 emissions
from aircraft exhaust to minimize impacts on stratospheric ozone and radiative
forcing. (See RESEARCH NEWS, this Global Climate Change Digest issue--July
"Stratospheric Mean Ages and Transport Rates from Observations of
Carbon Dioxide and Nitrous Oxide," K.A. Boering, S.C. Wofsy (Dept. Earth &
Planet. Sci., Harvard Univ., Cambridge MA 02138), et al., Science, 274(5291),
1340-1343, Nov. 22, 1996.
Deductions made from stratospheric observations of CO2 and N2O show that
current model simulations probably underestimate pollutant concentrations from
proposed stratospheric aircraft by 25-100%.
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