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首页> 外文期刊>Journal of Atmospheric Chemistry >A dual site study of the rainwater chemistry within the Western Pacific region
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A dual site study of the rainwater chemistry within the Western Pacific region

机译：对西太平洋地区雨水化学的双站研究

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摘要

The two-year (1999-2000) rainwater chemistry at two monitoring sites in nearby coastal areas [Taiwan (TW) and Hong Kong (HK)] within the Western Pacific region has been studied. The volume weighted average pH values for the entire sampling period in TW and HK were 4.6 and 4.2, respectively. Sea salt Na~+ and Cl~- were the most abundant species in the TW samples but SO_4~(2-) and H~+ were the most abundant in the HK samples. The sea salt and NH_4~+ concentrations at TW were higher than those at HK both in the cold and warm seasons. Chloride depletion was minimal in the rainwater samples at both sites. Non seasalt-SO_4~(2-) was associated with NH_4~+. Under the influence of the East Asian Winter Monsoon, the back-trajectory studies revealed that elevated anthropogenic species concentrations were associated with trajectories (1) very near to the continental boundary layer of Mainland China; or (2) along the coastline of Eastern China where large cities/industrial areas are located or (3) passing through the region of stagnant air over Northern/Eastern China. The lowest anthropogenic and crustal species concentrations measured in HK are associated with the summer monsoon and are attributed not only to the clean marine air masses but also to the relatively low SO_2, NO_x and NH_3 emissions from the South/South East Asian countries, as well as infrequent biomass burning activities and wet scavenging at sources during the summer months. Approaching tropical cyclones led to the lowest pH values (4.2 in TW and 3.8 in HK) amongst the other weather categories. The findings here have been compared with other studies within East Asia and elsewhere.
机译：研究了西太平洋区域附近沿海地区[台湾（TW）和香港（HK）]两个监测点的两年（1999-2000）雨水化学。 TW和HK整个采样期间的体积加权平均pH值分别为4.6和4.2。海盐Na〜+和Cl〜-在TW样品中含量最高，而SO_4〜（2-）和H〜+在HK样品中含量最高。在寒冷和温暖的季节，TW处的海盐和NH_4〜+浓度均高于HK。在两个地点的雨水样品中，氯化物的消耗最小。非海盐-SO_4〜（2-）与NH_4〜+有关。在东亚冬季风的影响下，反向轨迹研究表明，人为升高的物种浓度与轨迹相关（1），非常靠近中国大陆的大陆边界层；或（2）沿大城市/工业区所在的华东海岸线，或（3）经过华北/华东的停滞空气区域。在香港测得的最低人为和地壳物种浓度与夏季风有关，不仅归因于清洁的海洋气团，而且还归因于东南亚/东南亚国家相对较低的SO_2，NO_x和NH_3排放因为夏季很少发生生物量燃烧活动和源头湿清除。在其他天气类别中，接近热带气旋导致pH值最低（TW为4.2，HK为3.8）。此处的发现已与东亚及其他地区的其他研究进行了比较。

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