| Summary: | 碩士 === 國立中央大學 === 化學系 === 85 === ----本研究是探討東北季風期台灣地區竹子山區層狀雲內硫酸根及其它主
要離子的濃度,並配合微雲物理參數及二氧化硫的測量,以期了解硫化物在
真實大氣環境中死掃除的過程.實際採樣的結果硫酸根與硝酸根的比值
為4.69,此值偏高,顯示台灣北部山區冬季雲酸化的主因應該是屬於境外移
入的汙染物所造成.從天氣型態階段分析中出現大氣中的二氧化硫與雲水
中的硫酸根也有相同趨勢,而且高峰期都出現在天氣型態為東北季風旺盛
時期,推測兩者可能來自相同的汙染源.其次,藉由微雲物理參數(雲滴體積
平均粒徑)也發現總離子濃度與之呈現相反的趨勢,此結果驗證雲滴粒徑大
小在掃除過程中,扮演重要的角色,也說明了稀釋作用對雨水中所含化學物
種有決定性的影響.
The purpose of this studyis to determine the concentration
levels of sulfateand the other ions in stratoform clouds
obserbed at the Mt. Bamboo(1100mMSL)during the northeast monsoon
season of 1997. We also measured the atmosphericconcentration of
SO2 and the cloud microphysical properties in order to have
abetter understanding of the scavenging mechanism of the sulfate
by cloud droplets. The high ratio of the SO4/NO3(4.69) suggested
that most of acidicsubstances could be contributed through long-
rang transpot. In general, the SO2 and sulfate were well
correlated. High concentration of the SO2 and sulfate often
appeared associated with northeast monsoon flow. Cloud
dropletsize often had a negative correlation with the total ion
concentrtion, indicating that the dilution effect may play an
important role.
|
|---|
