Study of Asian Dust Phenomena in 2001–2003 Using A Network of Continuously Operated Polarization Lidars
Study of Asian Dust Phenomena in 2001–2003 Using A Network of Continuously Operated Polarization Lidars
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DOI：
10.1007/s11267-005-0732-1
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
N. Sugimoto;A. Shimizu;I. Matsui;I. Uno;K. Arao;Xuhui Dong;Shu-hui Zhao;Jun Zhou-;Choo-Hie Lee
中科院分区：
文献类型：
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作者：
N. Sugimoto;A. Shimizu;I. Matsui;I. Uno;K. Arao;Xuhui Dong;Shu-hui Zhao;Jun Zhou-;Choo-Hie Lee
我们在北京、合肥、水原、浦项、长崎、筑波和札幌等地进行了沙尘观测，使用自动双波长偏振激光雷达研究亚洲沙尘现象，包括产生、传输和传输过程中的变化。我们开发了一种方法，使用去极化比估计的贡献，亚洲尘埃和球形空气污染气溶胶在观测到的气溶胶混合物。我们对沙尘廓线进行了统计分析，以得出气候特征和逐年变化。利用区域化学输送模式CFERS研究了各次沙尘事件的沙尘来源和输送路径。统计分析清楚地显示了沙尘现象的逐年变化和随观测点位置而变化的特征。2001年和2002年的大部分沙尘天气起源于内蒙古和/或位于西伯利亚低压区南部边缘的蒙古，并由强西风带输送。2003年，除了4月份的一次沙尘天气外，没有出现伴随西伯利亚强低压的典型沙尘天气。此外，在北京的激光雷达观测表明，在内蒙古和/或蒙古国的源区产生较少的灰尘，可能是由于2003年降水量较高。
We have conducted dust observations at a number of locations including Beijing, Hefei, Suwon, Fukue, Nagasaki, Tsukuba, and Sapporo using automated two-wavelength polarization lidars o study Asian dust phenomena, including generation, transport, and change during transport. We developed a method using the depolarization ratio for estimating the contributions of Asian dust and spherical air-pollution aerosols in observed aerosol mixtures. We analyzed the dust profiles statistically to derive climatological characteristics and year-on-year variations. We also studied dust source and transport path for each dust event using the regional chemical transport model CFORS. The statistical analysis clearly demonstrated the year-on-year variation of dust phenomena and the characteristics depending on the locations of the observational sites. Most major dust events in 2001 and 2002 originated in Inner Mongolia and/or Mongolia at the southern edge of a low-pressure area located in Siberia and were transported by strong westerlies. In 2003, the typical meteorological pattern for heavy dust cases accompanying a strong low in Siberia was not seen, except for one case in April. Furthermore, the lidar observation in Beijing suggests that less dust was generated in the source regions in Inner Mongolia and/or Mongolia, probably due to higher precipitation in 2003.