Variation of low molecular weight organic acids in precipitation and cloudwater at high elevation in South China |
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Authors: | Yan Wang Minghu Sun Penghui Li Yuhua Li Likun Xue Wenxing Wang |
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Affiliation: | aSchool of Environmental Science and Engineering, Shandong University, Jinan 250100, China;bSchool of Atmospheric Sciences, Nanjing University, Nanjing 210093, China;cState Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control, Nankai University, Tianjin 300071, China;dEnvironment Research Institute, Shandong University, Jinan 250100, China |
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Abstract: | To investigate the sources and chemical behaviors of carboxylic acids in Southern China, precipitation and corresponding cloudwater samples were collected in an acid rain-prone area of Mount Heng. The carboxylic acid levels in the samples were measured, and the concentration patterns were evaluated with respect to temporal and seasonal variations. Formic and acetic acids were predominant among the carboxylic acids identified for both precipitation and cloudwater. Most of the organic acids in the precipitation had a clear seasonal pattern, reaching higher levels during the warm season; these higher levels were attributed to the stronger source strength of biogenic emissions during this season. The cloud–fog samples did not display a similar trend. A distinctive diurnal pattern in carboxylic acids was only observed in the precipitation samples during the warm season. In cloud–fog, the ratio of formic to acetic acid differed considerably with time, with these values varying little in the precipitation samples. This result indicates that the organic acids in precipitation originate consistently from primary sources throughout the entire period, while those in cloud are mainly associated with direct emissions in the earlier stage and with secondary sources in the later period. |
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Keywords: | Carboxylic acids Mount Heng Cloud-precipitation Sources |
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