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朱佳雷,王体健,王婷婷,Leiming Zhang. 中国地区大气汞的干沉降速度[J]. 生态毒理学报, 2014, 9(5): 862-873
中国地区大气汞的干沉降速度
Dry Deposition Velocity of Atmospheric Mercury over China
投稿时间:2014-03-04  修订日期:2014-06-11
DOI:10.7524/AJE.1673-5897.20140304001
中文关键词:  大气汞  干沉降速率  敏感性分析  区域大气环境模拟系统(RegAEMS)
英文关键词:atmospheric mercury  dry deposition velocity  sensitive analysis  regional Atmospheric Environment Model System (RegAEMS)
基金项目:高等学校博士学科点专项科研基金(20110091110010);国家重点基础研究发展计划(2010CB428503);国家科技部公益行业(气象)科研专项(GYHY201206011-1);科技支撑项目(2011BAK21B03)和国家人才培养基金(J1103410)
作者单位
朱佳雷 南京大学大气科学学院南京 210093 
王体健 南京大学大气科学学院南京 210093 
王婷婷 南京大学大气科学学院南京 210093 
Leiming Zhang 气象服务部加拿大环保署多伦多 M3H5T4 
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中文摘要:
      借助箱模式对汞的干沉降过程进行敏感性分析,并利用区域大气环境模式系统RegAEMS计算中国地区汞干沉降速度的时空分布特征。结果表明,森林下垫面下三类汞(气态零价汞、活性气态汞和颗粒态汞)的干沉降速度较大( 0.13、4.5和0.45 cm·s-1),水体表面上的相对较小(0.0012,0.5和0.11 cm·s-1)。敏感性分析发现,三类汞的干沉降速度随着近地层风速增加;降水或者地表湿度降低会导致零价汞和活性气态汞干沉降速度增加;雪盖厚度会减小气态零价汞的干沉降速度而增加活性气态汞的干沉降速度。三类汞的干沉降速度在区域上分布类似,东北以及南部地区最高,华东地区最小。季节变化上,气态零价汞、活性气态汞的干沉降速度在多数下垫面都夏季最大,冬季最小;颗粒态汞季节变化不明显。
           
AuthorAffiliation
Zhu JialeiSchool of Atmospheric Sciences, Nanjing University, Nanjing 210093
Wang TijianSchool of Atmospheric Sciences, Nanjing University, Nanjing 210093
Wang TingtingSchool of Atmospheric Sciences, Nanjing University, Nanjing 210093
Leiming ZhangMeteorological Service Canada, Environment Canada, Toronto M3H5T4
英文摘要:
      ensitive studies were performed using dry deposition box model to analyze the effects of different factors (meteorological) on mercury dry deposition velocity. Then the box model was incorporated into Regional Atmospheric Environment Model System (RegAEMS) to investigate the spatiotemporal variation of atmospheric mercury dry deposition velocity. Results from calculated dry deposition verlocity (Vd) of mercury indicate that Hg0, reactive gaseous mercruy (RGM), and Hgp were more easily removed in forest surface (0.13, 4.5 and 0.45 cm s-1) . Sensitivity analysis showed that large wind speed was more favorable to remove Hg0, RGM, and Hgp from atmosphere in most surface. In the conditions with precipitation or with lower relative humidity, Vds of Hg0 and RGM had considerable increase. Vd of Hg0 will get smaller with increasing depth of snow, which is different from those of RGM and Hgp. In East China, Vds of these three kinds of mercury are smaller than that in other regions over China. There was significant seasonal variation for Vds of Hg0 and RGM, which shows lagrer Vds in summer while smaller Vds in winter in most regions over East Asia. Seasonal variation of Vd for Hgp was much weaker.
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