Estimation of vegetative mercury emissions in China

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• 作者：Jiannong QUAN ; Xiaoshan ZHANG ; Shang Gyoo SHIM
• 关键词：mercury emission ; Biogenic Emission Inventory System (BEIS3) ; natural source
• 刊名：Journal of Environmental Sciences
• 出版年：2008
• 出版时间：2008
• 年：2008
• 卷：20
• 期：9
• 页码：1070-1074
• 全文大小：290 K

文摘

Vegetative mercury emissions were estimated within the framework of Biogenic Emission Inventory System (BEIS3 V3.11). In this estimation, the 19 categories of U.S. Geological Survey landcover data were incorporated to generate the vegetation-specific mercury emissions in a 81-km Lambert Conformal model grid covering the total Chinese continent. The surface temperature and cloud-corrected solar radiation from a Mesoscale Meteorological model (MM5) were retrieved and used for calculating the diurnal variation. The implemented emission factors were either evaluated from the measured mercury flux data for forest, agriculture and water, or assumed for other land fields without available flux data. Annual simulations using the MM5 data were performed to investigate the seasonal emission variation. From the sensitivity analysis using two sets of emission factors, the vegetative mercury emissions in China domain were estimated to range from a lower limit of 79 × 10³ kg/year to an upper limit of 177 × 10³ kg/year. The modeled vegetative emissions were mainly generated from the eastern and southern China. Using the estimated data, it is shown that mercury emissions from vegetation are comparable to that from anthropogenic sources during summer. However, the vegetative emissions decrease greatly during winter, leaving anthropogenic sources as the major sources of emission.