我国燃煤汞沉降的数值模拟

权建农-;张晓山;张蔷;李宏宇

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高原气象 ›› 2009, Vol. 28 ›› Issue (1) : 159-164.
论文

我国燃煤汞沉降的数值模拟

  • 权建农-;张晓山;张蔷;李宏宇
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Simulation of the Deposition of Hg Emitted from CoalConsumption in China by CMAQ-Hg Model

  • QUAN Jian-nong-;ZHANG Xiao-shan;ZHANG Qiang;LI Hong-yu
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摘要

利用CMAQ-Hg (Community Multi-scale Air Quality-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2~6 μg m-2 mon-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。

Abstract

Mercury (Hg) emission from coal combustion in China isestimated in this study and its deposition calculated using the Models-3 Community Multi-scale Air Quality (CMAQ-Hg) modeling system with meteorological fields calculated by MM5.Threekinds of Hg speciationwere included in the models: Particle-bound mercury (PHg), gaseous elemental mercury (GEM) and gas oxidized mercury (RGM). Much of the Hg was released as RGM from coal combustionin China, accounting for 58.4%~66.8% of total emissions. The large proportion of RGM in overall Hg emissionalso ledto large Hg deposition. Based on simulations, Hg deposition originatingfrom coal combustion reaches as high as 2~6 μg·m-2·mon-1 insouthwestern China (particularly Guizhou Province), the industrialized and populated regions of east central and coastal China, and Liaoning Provincein the northeast.

关键词

区域汞模式(CMAQ-Hg / 燃煤汞排放 / 汞形态分布 / 汞干湿沉降

Key words

CMAQ-Hg model / Hg emission from coa / Hg speciation / Hg deposition

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导出引用
权建农-;张晓山;张蔷;李宏宇. 我国燃煤汞沉降的数值模拟. 高原气象. 2009, 28(1): 159-164
权建农-;张晓山;张蔷;李宏宇. Simulation of the Deposition of Hg Emitted from CoalConsumption in China by CMAQ-Hg Model. Plateau Meteorology. 2009, 28(1): 159-164

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