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高原气象  2009 

我国燃煤汞沉降的数值模拟

, PP. 159-164

Keywords: 区域汞模式(CMAQ-Hg),燃煤汞排放,汞形态分布,汞干湿沉降

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Abstract:

利用CMAQ-Hg(CommunityMulti-scaleAirQuality-Mercury)模式模拟了我国燃煤排放的大气汞在我国区域的沉降分布状况,其中气象模式为MM5。模式中包括了三种价态汞(气态元素汞(GEM)、气态活性汞(RGM)和颗粒汞(PHg))的气相、液相、非均相化学反应过程以及输送、干湿沉降等物理过程。中国燃煤排放的大气汞中RGM所占比例较高,约为58.4%~66.8%,这导致我国汞沉降量较大。模拟结果表明,在我国的西南地区、华东地区以及京津塘地区燃煤汞的沉降较高,在这些区域的沉降通量高达2~6μgm-2mon-1。燃煤大气汞排放形态对汞的沉降有重要影响,减少燃煤汞排放中RGM的比例能够显著降低我国区域汞的沉降通量。

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