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UP: Umweltphysik

UP 9: Poster: Atmosph
äre und Klima

UP 9.9: Poster

Dienstag, 8. März 2005, 10:15–12:15, Poster TU HTF

Estimate of Global Carbon Monoxide Budget Derived From MOPITT Data — •Holger Bremer — Institut für Umweltphysik, Universität Bremen, Otto-Hahn-Allee 1, 28359 Bremen

Carbon monoxide influences the oxidizing capacity of the troposphere as the major sink of OH radicals. Thus it is very important to have an accurate estimate of the CO budget of the atmosphere. On the basis of measurements the general features of global CO distribution have been established and it is well known, that CO concentrations are higher in the northern hemisphere than in the southern hemisphere. However, another important source of CO is biomass burning, much of which takes place in the southern tropics. In particular the seasonal biomass burning in Africa and South America injects large plumes of CO into the atmosphere which in turn affect tropospheric ozone concentrations. Another very significant emission source is Indonesia, where land-use conversion projects among other reasons have resulted in large biomass burning in recent years. In this work, we used total atmospheric column measurements of carbon monoxide (CO) from the MOPITT (Measurement of Pollution in the Troposphere) instrument to study the CO burden of the atmosphere. The global budget of CO has been estimated from the satellite measurements for the first time. The total emission of CO is estimated to be 1900-2230 Tg/year which is near the lower end of the previous estimates from models and climate change assessment reports. We assumed the reaction with OH to be the primary sink of CO and neglected all others including surface deposition. This sink is estimated to be 1890-2185 Tg, which is also within the range estimated previously.