The Emergence of a Pattern of Global Change in the Upper Atmosphere and Ionosphere

Details The Emergence of a Pattern of Global Change in the Upper Atmosphere and Ionosphere The Emergence of a Pattern of Global Change in the Upper Atmosphere and Ionosphere

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsa51c..01l&link_type=abstract

American Geophysical Union, Spring Meeting 2007, abstract #SA51C-01

Physics

0340 Middle Atmosphere: Composition And Chemistry, 1610 Atmosphere (0315, 0325), 1630 Impacts Of Global Change (1225), 2400 Ionosphere (6929)

Scientific paper

In the upper atmosphere, greenhouse gases produce a cooling effect, instead of a warming effect. Increases in greenhouse gas concentrations are expected to induce substantial changes in the mesosphere, thermosphere, and ionosphere, including a thermal contraction of these layers. Here we present the first global pattern of the observed long-term change in the upper atmosphere and ionosphere, based on trend studies of various parameters. The picture we obtained is qualitative, and contains several gaps and a few discrepancies, but the overall pattern of observed long-term changes throughout the upper atmosphere is mutually consistent and qualitatively consistent with model predictions of the effect of greenhouse gas increases. The upper atmosphere as a whole is cooling and contracting, and changes in temperature and related changes in minor constituents are responsible for changes of the ionosphere. Together with the large body of lower atmospheric trend research, our synthesis indicates that anthropogenic emissions of greenhouse gases are affecting the atmosphere at nearly all altitudes between ground and space.

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