Large emissions of perfluorocarbons in East Asia deduced from continuous atmospheric measurements.
Large emissions of perfluorocarbons in East Asia deduced from continuous atmospheric measurements.
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DOI：
10.1021/es1001488
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发表时间：
2010-05
影响因子：
11.4
通讯作者：
Takuya Saito;Y. Yokouchi;A. Stohl;S. Taguchi;H. Mukai
中科院分区：
文献类型：
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作者：
Takuya Saito;Y. Yokouchi;A. Stohl;S. Taguchi;H. Mukai
自2006年以来，在日本的两个观测站（落石角和波照间岛）连续测量了全氟化碳（PFC）的大气混合比，以推断其全球和区域排放量。测得的C（2）-C（4）PFCs [PFC-116（C（2）F（6））、PFC-218（C（3）F（8））和PFC-318（c-C（4）F（8））]的基准混合比率显示每年略有增加，增幅为1%-3%。在这两个地点，在经过东亚大都市地区上空的气团中偶尔观察到高于基准的混合比增强，表明这些地区的PFC排放量很高。我们将运输模型应用于这些污染事件和反演技术来估计国家排放量。结果表明，在所研究的区域（中国、日本、朝鲜、韩国和台湾）中，中国是最大的PFC排放国，占区域排放量的一半以上，其次是日本。东亚每种PFC的估计总排放量分别为：PFC-116为0.86 Gg yr（-1），PFC-218为0.31 Gg yr（-1），PFC-318为0.56 Gg yr（-1）。由于基准混合比率逐年增加，它们对全球排放量的贡献很大，占全球PFC-218和PFC-318排放量的75%以上，约占全球PFC-116排放量的40%。
The atmospheric mixing ratios of perfluorocarbons (PFCs), extremely potent greenhouse gases, have been continuously measured at two Japanese stations (Cape Ochiishi and Hateruma Island) since 2006, to infer their global and regional emissions. The baseline mixing ratios of the measured C(2)-C(4) PFCs [PFC-116 (C(2)F(6)), PFC-218 (C(3)F(8)), and PFC-318 (c-C(4)F(8))] showed slight annual increases of 1%-3%. Enhanced mixing ratios above baseline were occasionally observed at both sites in air masses that had passed over metropolitan regions in East Asia, suggesting high PFC emissions from those regions. We applied transport models to these pollution events and an inversion technique to estimate national emissions. The results suggest that, among the studied regions (China, Japan, North Korea, South Korea, and Taiwan), China was the largest PFC emitter, accounting for more than half of the regional emissions, followed by Japan. The estimated total emissions of each PFC from East Asia were 0.86 Gg yr(-1) for PFC-116, 0.31 Gg yr(-1) for PFC-218, and 0.56 Gg yr(-1) for PFC-318. They contributed greatly to global emissions as derived from the annual increases in the baseline mixing ratios, accounting for more than 75% of global PFC-218 and PFC-318 emissions and for approximately 40% of global PFC-116 emissions.