科研之友
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摘要
Prediction of removal of atmospheric pollutants with mixed composition, as they are present in the atmosphere, is very difficult and many uncertainties affect the quantification of their effects on climate and ecosystems. Investigations of precipitation data are important for evaluation of forests and soil conditions and for comparison of precipitation chemistry time trends at local and regional scale. The aim of this study has been to contribute to the understanding of scavenging by precipitation of anthropogenic and naturally emitted aerosols and trace gases and might help to improve the understanding of scavenging process parameterizations, which are crucial in climate change simulations with numerical climate models. We analyzed extracted data from two published datasets of rainwater chemical composition as follows: one for Iasi urban area, Romania [1], and one dataset with acidic precipitation data [2] in Retezat Mountains, Romania. We added for comparison extracted data from Indian Ocean Experiment 13]. We constructed a synthetic dataset by considering SO(4)(2-), Cl(-), NO(3)(-), NH(4)(+), Na(+), K(+), Ca(2+), Mg(2+), as constituents important in precipitation chemistry that may imply ecological effects after deposition. We established relationships between major ion total concentrations and for different ionic constituents and precipitation depth for both Romanian sites. The computed washout ratios represent the first ones derived for an urban and a mountain site in our country. We also show that an indicative concentration of atmospheric pollutant concentrations during rain can be derived. These results can be used in closure studies when a more extensive field campaign (atmospheric aerosols and rainwater collected simultaneously) can be performed, as well. Moreover, washout coefficients for the selected Romanian regions have not previously been reported.
- 出版日期2010-5
