Variation of low molecular weight organic acids in precipitation and cloudwater at high elevation in South China
Variation of low molecular weight organic acids in precipitation and cloudwater at high elevation in South China
复制标题
华南高海拔地区降水和云水中低分子有机酸的变化
DOI：
10.1016/j.atmosenv.2011.08.064
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发表时间：
2011-11
影响因子：
5
通讯作者：
Wang, Wenxing
中科院分区：
文献类型：
--
作者：
Wang, Yan;Sun, Minghu;Li, Penghui;Li, Yuhua;Xue, Likun;Wang, Wenxing
为了研究中国南方地区羧酸的来源和化学行为，在衡山酸雨易发区收集了降水和相应的云水样品。测量了样品中的羧酸水平，并根据时间和季节变化评估了浓度模式。在降水和云水中鉴定的羧酸中，甲酸和乙酸占主导地位。降水中大部分有机酸具有明显的季节特征，暖季有机酸含量较高；这些较高的水平归因于本季节生物源排放强度较强。云雾样本没有显示出类似的趋势。仅在暖季降水样品中观察到羧酸的独特日变化模式。在云雾中，甲酸与乙酸的比值随时间变化很大，而这些值在降水样品中变化不大。结果表明，降水中的有机酸在整个时期始终来源于一次源，而云中的有机酸在前期主要与直接排放有关，后期主要与二次源有关。
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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影响因子：
5
作者：
V. Saxena;N. Lin
通讯作者：
V. Saxena;N. Lin
DOI：
10.1111/j.1600-0889.1988.tb00109.x
发表时间：
1988-11
期刊：
Tellus B
影响因子：
--
作者：
W. Winiwarter;H. Puxbaum;S. Fuzzi;M. Facchini;G. Orsi;N. Beltz;K. Enderle;W. Jaeschke
通讯作者：
W. Winiwarter;H. Puxbaum;S. Fuzzi;M. Facchini;G. Orsi;N. Beltz;K. Enderle;W. Jaeschke
影响因子：
5.5
作者：
Huang, Xiao-Feng;Li, Xiang;Zeng, Li-Wu
通讯作者：
Zeng, Li-Wu
影响因子：
2
作者：
Gang Xu;X. Lee;Yingchun Lv
通讯作者：
Gang Xu;X. Lee;Yingchun Lv
影响因子：
5
作者：
S. R. Souza;P. Vasconcellos;L. Carvalho
通讯作者：
S. R. Souza;P. Vasconcellos;L. Carvalho