• 土地利用与环境变化 •

### 中亚沙尘气溶胶时空分布特征及潜在扩散特性分析

1. 1. 新疆大学资源与环境科学学院,乌鲁木齐 830046
2. 绿洲生态教育部重点实验室,乌鲁木齐 830046
3. 新疆交通职业技术学院,乌鲁木齐 831401
• 收稿日期:2016-07-07 修回日期:2016-10-15 出版日期:2017-03-15 发布日期:2017-03-15
• 作者简介:

作者简介：张喆(1988-), 女, 新疆石河子人, 博士生, 主要从事干旱区资源环境遥感研究。E-mail: zhangzhe_0110@yeah.net

• 基金资助:
自治区重点实验室专项基金(2016D03001, 2014KL005);自治区科技支疆项目(201591101);国家自然科学基金项目(U1303381, 41261090, 41161063);自治区专家顾问团决策研究与咨询项目(201601044);新疆大学优秀博士研究生创新项目(XJUBSCX-2014012)

### Spatio-temporal variations and potential diffusion characteristicsof dust aerosol originating from Central Asia

Zhe ZHANG1,2(), Jianli DING1,2(), Jinjie WANG1,2,3

1. 1. College of Resources and Environment Science, Urumqi 830046, China
2. China Key Laboratory of Oasis Ecosystem of Education Ministry, Xinjiang University, Urumqi 830046, China
3. Xingjiang Vocational andTechnical College of Communication, Urumqi 831401, China
• Received:2016-07-07 Revised:2016-10-15 Published:2017-03-15 Online:2017-03-15
• Supported by:
Xinjiang Uygur Autonomous Region Key Laboratory Special Fund, No.2016D03001, No.2014KL005;Xinjiang Uygur Autonomous Region Science and Technology Support Project, No.201591101;National Natural Science Foundation of China, No.U1303381,No.41261090, No.41161063;Decision Making Research and Consulting Project of the Expert Advisory Group of the Autonomous Region, No.201601044;Innovation Project of Doctoral Candidate of Xinjiang University, No.XJUBSCX-2014012

Abstract:

Central Asia is located in arid and semi-arid regions. This region contributes to dust aerosols because of desertification and land degradation. In order to better understand temporal variability, vertical distribution, and potential diffusion characteristics of salt dust and desert dust in Central Asia, we studied the intranasal changes in dust aerosol from the Aral Sea basin and Taklimakan Desert using MODIS aerosol data and CALIOP data, and analyzed its potential seasonal diffusion from 2005 to 2015 using the HYSPLIT model. Results showed that AOD of this region was high in spring and summer and low in autumn and winter. Over the 14 years, it showed an increasing trend. The mean values of the four seasons were: spring (0.412) > summer (0.258) > autumn (0.167) ≈ winter (0.159). The annual AOD high value areas were mainly concentrated in the Tarim Basin in southern Xinjiang and surrounding areas of Aral Sea. The annual average value of AOD in Aral Sea was 0.278, and annual amplification was 3.175%. It is indicated that the degradation of the Aral Sea had a direct impact on the AOD surrounding area. The annual average value of AOD in the Tarim Basin was 0.421, and annual amplification was 0.062%, which was mainly affected by temperature and wind speed, and the dominant factors were slightly different in different seasons. Dust aerosols were mainly concentrated in a range of 0-2 km. Aerosol depolarization ratio range in the desert (10%-45%) was slightly greater than that in the Aral Sea (15%-30%) and the aerosol color ratio range in the Aral Sea (0.3-0.8) was less than that of the desert (0.5-0.9). There were two high-frequency color ratios of 0.5 and 0.3 from the dust zone over 0-2 km and 4-6 km of salt dust. Compared to dust aerosols, salt dust aerosols had smaller irregularities and particle size, and higher impact of height range. As for the Aral Sea region, the potential distance and height of air parcel trajectories to the northeast were greater than to the west and south, whereas the air parcel trajectory proportion of the former was lower than that of the latter, which mainly affect Uzbekistan and Turkmenistan. Most of the dust in the Taklimakan Desert is still settling in the vicinity of the dust source region. The potential diffusion path to the eastern regions has impact on Qinghai, Gansu, Ningxia, Shaanxi and other regions.