Geostatistical Space-time Analysis of Non-seasalt Sulfate Wet Deposition in Japan
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概要
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In order to assess the spatial distribution of wet deposition, a regionalization of the time-series model was considered through the application of a geostatistical method. Datasets employed were obtained from nation-wide monitoring measurements of nss-sulfate deposition by Ministry of the Environment and the Japan Environmental Laboratories Association. The spatiotemporal distribution of nss-sulfate deposition was modeled as a joint realization of a collection of spatially correlated time series. Parametric temporal trend models were first established for individual monitoring stations, and the obtained model parameters and residuals were regionalized in space. Stochastic simulation and kriging were performed in order to formulate predictions of the trend models and the residual profiles for the spatial locations and time instants with out the monitoring measurements. The independently regionalized trend and the residual realizations were added together to produce realizations of nsssulfate deposition and to map the distribution. The results of the analysis suggest that nss-sulfate deposition has a trend that typically decreases throughout the nation. Areas with high deposition were found to indicate significant variations in regional features of the map of the final realization. In summer, relatively high deposition of nss-sulfate were realized in the Kyushu region and near the Seto Inland Sea. In winter, on the other hand, the nss-sulfate deposition was highly elevated on the coast of the Sea of Japan. An application of the present method to the wet deposition dataset for the Kanto area enabled us to make a good estimate for the increase in the nss-sulfate deposition, which could be ascribed to volcanic emissions from Miyakejima.
- 社団法人 大気環境学会の論文
社団法人 大気環境学会 | 論文
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