An estimate on the rainout of atmospheric CO2

Abstract： The CO2 in the atmosphere is in contact with water vapor and rain droplets forming CO2 · H2O, HCO-3 and C2-3 . Global precipitation is about 505 x 1015 kg/a. Based on theoretical calculation for unpolluted air and measurement observations, we estimated that 100-270 x 1012 gC/a are scavenged from the air by global precipitation. This roughly equals carbon emissions from volcanic sources or 2-6 per cent of current CO2 emissions. An inventory-based estimate on carbon removal in northwestern Europe supports the above calculation on global scale. With increasing CO2 concentration in the air, precipitation scavenging may increase. 作 者： LIU Chun-jiang    Hannu Ilvesniemi    Werner Kutsch    MA Xiang-qing    Carl J.Westman    Pekka Kauppi   作者單位： LIU Chun-jiang(Ecology Center, University of Kiel, Schauenburgerstr 112, DE-24118 Kiel, Germany;Department of Forest Ecology, 00014 University of Helsinki, Finland)

Hannu Ilvesniemi,Carl J.Westman(Department of Forest Ecology, 00014 University of Helsinki, Finland)

Werner Kutsch(Ecology Center, University of Kiel, Schauenburgerstr 112, DE-24118 Kiel, Germany)

MA Xiang-qing(Forestry College, Fujian Agriculture and Forestry University, Nanping 353001, China)

Pekka Kauppi(Department of Environmental Protection, 00014 University of Helsinki, Finland) 

期 刊： 環境科學學報(英文版)  ISTICSCI   Journal： JOURNAL OF ENVIRONMENTAL SCIENCES  年，卷(期)： 2004, 16(1)  分類號： X131  Keywords： atmospheric CO2    dissolution    dissociation    precipitation scavenging    rainwater