本文的主要目的乃應用氣流軌跡探討東亞硫化物的長程輸送，並利用到達台北地區之氣流軌 跡，東亞硫排放量及氣流之運動路徑定義一個新的定量污染指標，以了解東亞各區域對台北可能 的污染潛力。硏究結果顯示影響台北地區的850hPa氣流來源，於東北季風型降水時期，以大陸 東南沿岸的江蘇、浙江一帶爲主，青康藏高原東側四川、雲南地區的氣流輻合區以及河南、陝西 次之；春季及梅雨季鋒面型降水時期，氣流以來自台灣西南方向的福建、廣東地區爲主，同時並 延伸至中南半島；秋冬季鋒面降水時期則以台灣西方由福建延伸至大陸內地的四川、雲南地區爲 主。污染潛力以東北季風降水時期最高，分布區域較廣，春季及梅雨季鋒面型次之，秋冬季鋒面 型最小，然其分布範圍與東北季風型相近。1990-1995年之總污染潛力指標顯示大陸東南沿岸地 區對台灣污染潛力最高，四川附近次之，大陸對台灣的影響潛力不僅限於鄰近東南沿海，其內陸 之硫排放量亦可隨大尺度環流輸送而來。

In this paper we define a new index (pollution potential index, PPI) to study the long range transport of sulfur compounds in East Asia and further to elucidate the source/receptor relationship between source regions and Taipei, based on the integrated path of the backward trajectory arriving at Taipei and the source strength of sulfur compounds. As a consequence, the 850hPa trajectories primarily originated from the southeastern coastal areas of Mainland China for rain events during the northeast monsoon seasons. For the frontal passage in spring, the air mass mainly derived from Fu-Cheng and Kuan-Tung areas. In addition, the source regions of air mass can extend to the inland of Mainland China for the rain events associated with frontal passage in fall. According to 1990-1995 dataset, the region along the southeast coast of Mainland China had the highest pollution potential on Taipei. Meanwhile, Si-Chuan was another major region of high PPI as well, indicating that sulfur compounds can be possibly carried to Taipei via the long-range transport.