- 期刊
氣象環流對背景大氣成份傳送影響：第一部分：軌跡方法之建立及個案分析結果
Effect of Circulation on the Background Air Transport: Establishment of Methodology and Preliminary Result
摘要
本研究是臺灣背景大氣研究之一部份，此部份研究的主要目的，是要瞭解氣象環流對背景大氣成份傳送的影響，探討本地區空氣污染物受局部環流影響混入背景大氣中的可能狀況。同時，藉由對臺灣地區氣候、天氣資料之分析，來探討影響臺灣最頻繁又最大的環流型態，並建立一系列之分析方法，來了解其它地區空氣污染物輸入本地區之狀況及其隨季節環流變化之情形。此部份主要是敘述軌跡分析方法之建立，以1991年在墾丁對臭氧所做的觀測之個案資料，來探討臭氧值受氣象條件及軌跡影響之情形。在Pem-West期間（1991年9月－10月）的個案分析結果，該期間內的臭氧變化情形可被區分為三種特性，一為在背景值區域即10-20 ppb，在此期間，其24小時前軌跡線主要來自東南或東邊，且伴隨較高濕度及上升運動，第二種特性為臭氧值在40-50 ppb，主宰的氣流為下沉的，而且相對濕度較低（～80%），軌跡來向大致由東北方向而來，第三種特性則臭氧值在100 ppb左右，此時的軌跡大都來自西邊或西北邊且仍伴隨著下沉氣流，明顯的與臺灣西岸的高濃度產生量有關。本文也初步討論了軌跡的季節特性。
並列摘要
The objective of this study is to understand the time-space characteristics of the traces gases in the background atmosphere, and also the influence of the atmospheric circulation on the local concentration variation.During the PEM-WEST experiment period, research team from the Taiwan Background Air Research (TAIBAR) program also measured the concentration of O3, SO2, PAN, NOx along with the surface meteorological variables. This paper present the methodology for trajectory calculation and use the PEM-WEST data to perform preliminary analysis. It is found that, during the time dominated by prevailing northeasterly and the sinking motion, the ozone concentration in Kenting is around 40 ppb. While in the rising motion period and the trajectory come from the East or Southeast, the ozone concentration is on the order of 10-20 ppb. The extreme high concentration of ozone, on the order of 100 ppb, can be related to the sinking motion and when the trajectories come from the West or Northwest.This study also used three years data to analyze, in different seasons, the characteristics of the air trajectory that reach Taiwan area. Favorable directions of the possible long range trasnsport, in the climatological sense are established.