Transport of atmospheric carbon monoxide, ozone, and hydrocarbons from Chinese coast to Okinawa island in the Western Pacific during winter
Transport of atmospheric carbon monoxide, ozone, and hydrocarbons from Chinese coast to Okinawa island in the Western Pacific during winter
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DOI：
10.1016/j.atmosenv.2004.02.049
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发表时间：
2004-06
影响因子：
5
通讯作者：
Shungo Kato;Y. Kajii;Ryunosuke Itokazu;J. Hirokawa;S. Koda;Yoshikatsu Kinjo
中科院分区：
文献类型：
--
作者：
Shungo Kato;Y. Kajii;Ryunosuke Itokazu;J. Hirokawa;S. Koda;Yoshikatsu Kinjo
2000年冬季，在日本南部的冲绳岛进行了一氧化碳、臭氧和碳氢化合物的测量。观测到的空气受中国沿海地区输送的污染影响。碳数越高，碳氢化合物浓度越低。这表明该测量点不受当地人为来源的影响。但臭氧浓度与零星高的CO浓度呈负相关。这表明污染源地区的污染空气输送速度很快。反向轨迹分析表明，来自中国沿海地区的气团含有比其他轨迹类型更高的碳氢化合物浓度。从源区到观测站的运移时间与观测到的烃类浓度呈负相关。冲绳的观测数据与1999年在西太平洋较偏远的小川岛的观测结果进行了比较。两个地点距大陆的距离不同，但油气减少的方式是相同的。许多碳氢化合物混合比的对数自然标准差在冲绳比在小川有更大的偏差。这表明冲绳受来自源头地区的污染空气的影响比小川更大。
CO, O3, and hydrocarbon measurements were conducted at Okinawa island, a southern Japanese island, during winter in 2000. The observed air was affected by the pollution transported from Chinese coastal area. Hydrocarbon concentration decreased as carbon number increased. This indicated that the measurement site was not affected by local anthropogenic sources. But negative correlation between O3and sporadically high CO was observed. This indicated the fast transportation of polluted air from source region. Backward trajectory analyses showed that the air mass came from Chinese coastal area contained higher concentration of hydrocarbons than other trajectory categories. Transport time from source area to the observatory and observed hydrocarbon concentrations had negative correlations. The observed data at Okinawa were compared with the result obtained at Ogasawara island, a more remote island in the Western Pacific, in 1999. Their distance from the continent were different, however, the way of hydrocarbon decrease was same manner at these two sites. The standard deviation of the log natural of the mixing ratio for many hydrocarbons had more deviation at Okinawa than at Ogasawara. This indicated that Okinawa was more affected by polluted air which transported from the source region than Ogasawara.