二次光化污染物與臭氧之關連性分析

Abstract

本研究於土城地區量測二次光化污染物的濃度，配合各樣因子分析，探討二次光化污染物與臭氧之變化趨勢，並藉由箱型模式模擬，探討高臭氧時段主要貢獻臭氧生成的物種。 分析2006年6月至2007年5月於土城測站所量測之二次光化污染物，在趨勢變化上分別分析其日夜變化及季節性變化趨勢，在本研究觀測時段中，發現H2O2與醛酮日夜變化大致與臭氧變化趨勢相同，皆在中午觀測時段容易有高值出現。在季節性變化方面，本研究發現臭氧季節性變化趨勢受到風向影響，在採樣時段盛行風向為東風時，臭氧濃度無明顯季節性變化趨勢，此時所量測醛酮化合物濃度大致落在一定範圍內；當盛行風向為西風系時，此時臭氧濃度以夏季觀測濃度較高，秋、冬季較低，春季則又呈現上升趨勢，與本研究所量測H2O2與醛酮濃度變化亦大致相同。 2007年5月3日為一臭氧事件日，本研究以此為案例，分析臭氧濃度變化成因，由各項因子分析來看，5月3日這天臭氧濃度較前一天高出許多的情況應不僅僅是光化反應所造成，本研究分析認為，風向變化應為可能的影響因子之ㄧ。 本研究應用光化學箱型模式，以2007年5月3日為研究案例，模擬日間臭氧濃度變化趨勢，並分析其主要敏感性物種。透過模擬發現，箱型模式確實能模擬臭氧濃度的初期變化：在敏感性物種分析上，以烷類、烯類、芳香族類及醛酮類為對象，模擬不同初始濃度下對臭氧的影響，在研究案例中發現醛酮化合物及芳香族類為致臭氧生成之最主要貢獻物種。

This study observed the concentration of secondary photochemical air pollutants in Tucheng, cooperate with various kinds of factor, to confer the variation tendencies of secondary photochemical pollutants and ozone. It was also use box model with case simulation, to discuss the main contribution species during high ozone period. Analyze the concentration of secondary photochemical air pollutants in Tucheng from June of 2006 to May of 2007, its daily and seasonal variation tendency. In this research observe period, find it is roughly the same as ozone daily tendency that H2O2 and carbonyl. In this study, the seasonal variation tendency of ozone is influenced by the wind direction, in sample period at prevailing wind direction east wind, ozone does not have obvious seasonal variation tendency, the concentration of carbonyl were falls within the specific limits at this moment; When the prevailing wind direction is west wind, ozone has seasonal variation tendency at this moment, it is also roughly the same with H2O2 and Carbonyl. May 3, 2007 is ozone episode, this research regards this as the case, analyzed the concentration of ozone changes the origin cause of formation. By various kinds of factor analysis, wind direction was probably influence factor. This research regards May 3, 2007 as the case of studying through the photochemistry box model. The variation tendency of ozone in the daytime of simulation, analyze its main sensitiveness species. Find through simulation, change in initial stage when case type way can really imitate the concentration of ozone.Compare with paraffins、oleffins、atomatics and carbonyl,the sensitiveness species is aromatics and carbonyl as the main contribution species causing the ozone in this research case.