本研究目的為了解不同人為活動型態所造成之PCDD/Fs乾濕沉降差異及全年PCDD/Fs乾濕沉降量變化情形，本研究分別針對商業都會郊區、工業都會區、鄰海鄉鎮區及農業鄉鎮區等四種不同性質地區進行四季大氣中PCDD/Fs濃度之採樣調查，並配合PCDD/Fs乾濕沉降模式模擬得知各月份大氣中PCDD/Fs乾濕沉降通量，且進一步釐清大氣中PCDD/Fs乾濕沉降通量與氣候條件之相關性。本研究發現大氣中PCDD/Fs濃度皆以粒狀物相為主，而位於台灣北部及中部之商業都會郊區、工業都會區及鄰海鄉鎮區大氣中PCDD/Fs平均濃度皆以冬季大氣中PCDD/Fs平均濃度較高，春季最低；位於台灣南部之農業鄉鎮區大氣中PCDD/Fs平均濃度則以春季大氣中PCDD/Fs平均濃度較高，夏季最低。乾沉降通量部分，商業都會郊區、工業都會區、鄰海鄉鎮區及農業鄉鎮區四季之PCDD/Fs乾沉降行為均以粒狀物相沉降為主；商業都會郊區、工業都會區及鄰海鄉鎮區夏季及冬季之PCDD/Fs乾沉降通量較高，春季及秋季之PCDD/Fs乾沉降通量較低，然而由於農業鄉鎮區之春季大氣PCDD/Fs採樣濃度偏高，因此農業鄉鎮區則以春季及冬季之PCDD/Fs乾沉降通量較高，夏季及秋季之PCDD/Fs乾沉降通量較低；PCDD/Fs乾沉降通量與各項氣候條件僅具有中度或低度相關性，而農業鄉鎮區之PCDD/Fs I-TEQ乾沉降通量則與氣溫存在高度負相關性。濕沉降通量方面，商業都會郊區、工業都會區、鄰海鄉鎮區及農業鄉鎮區四季之PCDD/Fs濕沉降行為均以粒狀物相下洗機制為主；商業都會郊區、工業都會區、鄰海鄉鎮區及農業鄉鎮區受梅雨、颱風及東北季風所夾帶雨量之影響，導致PCDD/Fs濃度濕沉降逐月通量呈現雙峰或三峰之現象；降雨量及相對濕度存在高度正相關性，而與PM10及PM10/PM2.5比呈現高度負相關。總沉降通量方面，商業都會郊區、工業都會區、鄰海鄉鎮區及農業鄉鎮區之PCDD/Fs沉降行為皆以乾沉降為主，且地區性人為活動型態對總PCDD/Fs沉降量存在顯著之影響。總PCDD/Fs沉降通量與降雨量呈現高度正相關，然而與其他氣象條件僅具有中度或低度相關性。總PCDD/FsI-TEQ濃度沉降通量與所有氣象條件均僅具有中度或低度相關性，表示各氣象條件皆對總PCDD/FsI-TEQ濃度沉降通量有一定之影響程度。

The objectives of the present study were to know the differences and the annual variances of the dry and wet depositions of Polychlorinated Dibenzo-p-dioxins (PCDDs) and Dibenzofurans (PCDFs) between kinds of areas. A commercial suburban area, an industrial urban area, a coastal rural area and an agricultural rural area were chosen to seasonally sample the concentrations of PCDD/Fs in the atmosphere in each kind of area. Then, the dry and wet monthly deposition fluxes of PCDD/Fs were calculated from the seasonally concentrations of PCDD/Fs in the atmosphere with the dry/wet deposition models. This research indicated that the most PCDD/Fs were adsorbed on the surface of the particulates in the atmosphere. The atmospheric concentractions of PCDD/Fs in the commercial suburban area, the industrial urban area and the coastal rural area which all were located in the north Taiwan were higher in winter and lower in spring, whether those in the agricultural rural area located in the south Taiwan were higher in spring and lower in summer. For dry depositions, the dominant mechanism of the dry deposition was the particle-phase deposition. The dry deposition fluxes of PCDD/Fs in the commercial suburban area, the industrial urban area and the coastal rural area in spring and autumn were higher than those in summer and winter, though othes in the agricultural rural area were higher in spring and winter. The dry deposition fluxes of PCDD/Fs highly negative-correlated with the ambient temperatures. For wet depositions, the dominant mechanism of the wet deposition was the particle scavenging. Due to the rainy season of the plum rains, the typhoons and the eastern-north monsoons, the wet depositions fluxes of PCDD/Fs were two- or three-peaks phase distributions within monthes. The wet deposition fluxes of PCDD/Fs highly positive-correlated with the rainfall and the relative humidity, but negative-correlated with the ambient PM10 concentraction and PM10/PM2.5 ratio. For total depositions, the dry deposition was more important the the wet deposition of PCDD/Fs to total depositions, and the artificial activities influence the fluxes of total depositions of PCDD/Fs. The fluxes of total depositions of PCDD/Fs highly positive-correlated with the rainfall, however, the fluxes of total depositions of PCDD/Fs just lowly or medially correlated with the meteorological conditions.

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