NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
A two-dimensional model with coupled dynamics, radiative transfer, and photochemistry. 2: Assessment of the response of stratospheric ozone to increased levels of CO2, N2O, CH4, and CFCThe impact of increased levels of carbon dioxide (CO2), chlorofluorocarbons (CFCs), and other trace gases on stratospheric ozone is investigated with an interactive, two-dimensional model of gas phase chemistry, dynamics, and radiation. The scenarios considered are (1) a doubling of the CO2 concentration, (2) increases of CFCs, (3) CFC increases combined with increases of nitrous oxide (N2O) and methane CH4, and (4) the simultaneous increase of CO2, CFCs, N2O, and CH4. The radiative feedback and the effect of temperature and circulation changes are studied for each scenario. For the double CO2 calculations the tropospheric warming was specified. The CO2 doubling leads to a 3.1% increase in the global ozone content. Doubling of the CO2 concentrations would lead to a maximum cooling of about 12 C at 45 km if the ozone concentration were held fixed. The cooling of the stratosphere leads to an ozone increase with an associated increase in solar heating, reducing the maximum temperature drop by about 3 C. The CFC increase from continuous emissions at 1985 rate causes a 4.5% loss of ozone. For the combined perturbations a net loss of 1.3% is calculated. The structure of the perturbations shows a north-south asymmetry. Ozone losses (when expressed in terms of percent changes) are generally larger in the high latitudes of the southern hemisphere as a result of the eddy mixing being smaller than in the northern hemisphere. Increase of chlorine leads to ozone losses above 30 km altitude where the radiative feedback results in a cooler temperature and an ozone recovery of about one quarter of the losses predicted with a noninteractive model. In all the cases, changes in circulation are small. In the chlorine case, circulation changes reduce the calculated column depletion by about one tenth compared to offline calculations.
Document ID
19950039656
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Schneider, Hans R.
(Atmospheric and Environmental Research, Incorporated Cambridge, MA, United States)
Ko, Malcolm K. W.
(Atmospheric and Environmental Research, Incorporated Cambridge, MA, United States)
Shia, Run-Lie
(Atmospheric and Environmental Research, Incorporated Cambridge, MA, United States)
Sze, Nien-Dak
(Atmospheric and Environmental Research, Incorporated Cambridge, MA, United States)
Date Acquired
August 16, 2013
Publication Date
November 20, 1993
Publication Information
Publication: Journal of Geophysical Research
Volume: 98
Issue: D11
ISSN: 0148-0227
Subject Category
Environment Pollution
Accession Number
95A71255
Funding Number(s)
CONTRACT_GRANT: NASW-4428
CONTRACT_GRANT: NASW-4080
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available