Aerosol optical properties at Mt. Waliguan Observatory, China
Aerosol optical properties at Mt. Waliguan Observatory, China
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DOI：
10.1016/j.atmosenv.2011.07.050
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发表时间：
2011-10
影响因子：
5
通讯作者：
H. Che;Yuesi Wang;Junying Sun
中科院分区：
文献类型：
--
作者：
H. Che;Yuesi Wang;Junying Sun
气溶胶光学特性在山。利用2009年9月至2010年8月的500 nm气溶胶光学厚度（AOD）和Angstrom指数（α）观测资料，对中国西北地区瓦里关天文台（WLG）进行了研究。AOD和Angstrom指数的平均值分别为0.14±0.07和0.59±0.24，两者的特征值分别为0.02至1.13和-0.03至1.37。春季气溶胶光学厚度值较高，Angstrom指数值较低，这可能是受亚洲沙尘天气的影响，而秋季和冬季气溶胶光学厚度值较低，小于0.10。k-means聚类分析将测量结果分为三种气溶胶模式，基于AOD和Angstrom指数分布，AOD的频率分布集中在0.07±0.002，0.11±0.02和0.18±0.12。WLG的气溶胶光学厚度明显大于Mauna Loa（MLO）和Izana（IZA），这是由于春季来自中国西部沙漠地区的沙尘气溶胶和夏季来自中国中部的细颗粒物的贡献。此外，邻近地面、地理位置和不同气溶胶组分的因素也可能导致WLG的气溶胶光学厚度高于MLO和IZA。
Aerosol optical properties at the Mt. Waliguan Observatory (WLG) in Northwest China are investigated based on the measurements of aerosol optical depth (AOD) at 500nm and Angstrom exponent (α) from September 2009 to August 2010. Mean values of 0.14±0.07 and 0.59±0.24 are observed for AOD and Angstrom exponent, respectively, both of which are characterized by a wide range of values from 0.02 to 1.13 and −0.03 to 1.37, respectively. A seasonal variation is found with high AOD and low Angstrom exponent values in spring which could be attributed to the effect of Asian dust events, and low ground AOD level of less than 0.10 in autumn and winter. The k-means cluster analysis separates the measurements into three aerosol modes based on the AOD and Angstrom exponent distributions with the frequency distribution of AOD centering about 0.07±0.002, 0.11±0.02, and 0.18±0.12. AOD at WLG is significantly larger than those at Mauna Loa (MLO) and Izana (IZA) because of the contribution of the dust aerosol in spring from desert regions of Western China and fine particles transport from Central China in summer. In addition, the factors of nearby surface, geographic location and different aerosol components could also contribute to higher AOD at WLG than MLO and IZA.