A model study of atmospheric temperatures and the concentrations of ozone, hydroxyl, and some other photochemically active gases during the glacial, the pre-industrial holocene and the present

Details A model study of atmospheric temperatures and the concentrations of ozone, hydroxyl, and some other photochemically active gases during the glacial, the pre-industrial holocene and the present A model study of atmospheric temperatures and the concentrations of ozone, hydroxyl, and some other photochemically active gases during the glacial, the pre-industrial holocene and the present

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.1047c&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 11, p. 1047-1050.

Physics

25

Atmospheric Temperature, Chlorocarbons, Hydroxyl Radicals, Industrial Wastes, Ozonometry, Photochemical Reactions, Air Pollution, Atmospheric Chemistry, Atmospheric Composition

Scientific paper

Analysis of air trapped in ice cores shows that the atmospheric contents of the greenhouse gases CO2, CH4 and N2O have increased from the glacial to the preindustrial holocene. Further increases have been occurring during the industrial era, which may have contributed to the observed global warming. In addition, CH4 and N2O play large roles in ozone and hydroxyl chemistry. Here we present a model analysis of the changes in atmospheric temperatures and the concentration of O3, OH and related gases between the three epochs. Despite large changes in the atmospheric contents of CO2, CH4 and N2O, total ozone and tropospheric OH hardly changed between the glacial and preindustrial holocene. The global annual atmospheric CH4 sink increased from 90 to 210 Tg between the glacial and preindustrial, and since then to 510 Tg, largely following the changes in atmospheric concentrations. Our results indicate less than half as much CH4 production from tropical wetlands during the ice age than during the holocene.

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