Regional distribution and emissions of mercury in east Asia: A modeling analysis of Asian Pacific Regional Aerosol Characterization Experiment (ACE-Asia) observations
Regional distribution and emissions of mercury in east Asia: A modeling analysis of Asian Pacific Regional Aerosol Characterization Experiment (ACE-Asia) observations
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DOI：
10.1029/2005jd006381
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发表时间：
2006-04
影响因子：
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通讯作者：
L. Pan;J. Woo;G. Carmichael;Youhua Tang;H. Friedli;L. Radke
中科院分区：
文献类型：
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作者：
L. Pan;J. Woo;G. Carmichael;Youhua Tang;H. Friedli;L. Radke
[1]进行了汞示踪模型模拟，以支持对2001年4月期间开展的亚太区域气溶胶特性试验(ACE-ASIA)活动期间NSF/NCAR C-130飞机15次飞行的总气相汞(TGM)观测结果的分析。观测到的汞浓度中有97%大于1.2 ng/立方米。观测值平均值为1.9毫微克/立方米。汞-CO和汞-总硫之间没有发现简单的关系，但在个别航段中观察到了很强的相关性。使用反向轨迹分析来帮助描述区域汞/一氧化碳比率的特征，并将这些比率与不同部门的基于排放的比率进行比较。提出了使用新的汞排放估计值的模型预测，并与观测结果进行了比较。在汞本底水平为1.2 ng/m~3的条件下，示踪模型低估了航班在黄海上空的观测值，但与航班在日本海上空的观测值一致。进一步的分析表明，中国中北部和中国东部沿海地区的汞排放量被低估了。模型敏感性研究表明，中国的排放量可能被低估了80%-200%。
[1] Mercury tracer model simulations are performed to support the analysis of the total gas phase mercury (TGM) observations on 15 flights of the NSF/NCAR C-130 aircraft during the Asian Pacific Regional Aerosol Characterization Experiment (ACE-Asia) campaign conducted during April 2001. Ninety-seven percent of the observed mercury concentrations are greater than 1.2 ng/m3. The mean value of the observations is 1.9 ng/m3. No simple relationships between Hg-CO and Hg-total sulfur are found; however, strong correlations are observed in individual flight segments. Backward trajectory analysis is used to help characterize regional of Hg/CO ratios, and these are compared with emission-based ratios from the various sectors. Model predictions using new Hg emission estimates are presented and compared to the observations. Under the condition of a mercury background level of 1.2 ng/m3 the tracer model underestimates the observations when the flights were over the Yellow Sea but is consistent with the observations when the flights were over the Japan Sea. Further analysis suggests that Hg emissions are underestimated in north central China and the eastern coastal areas of China. Model sensitivity studies indicate that the emissions of China may be underestimated by 80–200%.