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• CN 62-1072/P
• ISSN 1000-0240
• 创刊于1979年
• 主管单位：中国科学院
• 主办单位：中国科学院寒区旱区
•                  环境与工程研究所
•                  中国地理学会

• 冰冻圈与全球变化 •

### 河套干旱地区夏季边界层结构特征观测分析

1. 1. 宁夏气象防灾减灾重点实验室, 宁夏 银川, 750002;
2. 宁夏气候中心, 宁夏 银川, 750002
• 收稿日期:2015-05-18 修回日期:2015-07-10 出版日期:2015-10-25 发布日期:2016-03-28
• 作者简介:崔洋(1982-),男,宁夏吴忠人,高级工程师,2010年于兰州大学获博士学位,现主要从事气候变化、数值模拟、大气边界层研究.E-mail:cuiyang@cma.gov.cn.
• 基金资助:
宁夏自然科学基金(NZ13253;NZ12279);国家自然科学基金项目(41471034);中国气象局关键技术集成与应用项目(CMAGJ2014M58);公益性行业(气象)科研专项(GYHY201306027)资助

### The atmospheric boundary layer structure characteristics over the Hetao-Arid Region in summer:observation and analysis

CUI Yang1 2, CHANG Zhuolin1, SANG Jianren1 2, ZUO Hejiang1 2

1. 1. Key Laboratory of Meteorological Disaster Preventing and Reducing in Ningxia, Yinchuan 750002, China;
2. Ningxia Climate Center, Yinchuan 750002, China
• Received:2015-05-18 Revised:2015-07-10 Online:2015-10-25 Published:2016-03-28

Abstract: The atmospheric boundary layer structure characteristics over the Hetao-Arid Region in summer were investigated by using observational data by the mobile boundary layer wind profile radar(Airda K/LLX802J) in July, 2013 and the radiosonde data in Yinchuan. The daily variation of meteorological elements in the boundary layer, such as wind, temperature, atmosphere refractive index structure constant, relative humidity and vertical velocity were analyzed. It was revealed that the atmospheric refractive index structure constant detected by the Airda K/LLX802J wind profiler radar can better reflect and distinguish the turbulence occurrence, development, and the wind change and wind shear in the boundary layer over the Hetao-Arid Region in Northwest China. The summer average boundary layer height(BLH) of the region was 2127.2 m in daytime and 1760.7 m in nighttime in July. The BLH of daytime was 366.5 m higher than that of nighttime. The strong atmospheric convection activities over the Hetao-Arid Region were mainly concentrated in the boundary layer below 800 m, and the convective activity was weak between 800 m and 2000 m in summer. Non-adiabatic heating of Hetao-Arid Region's land surface to air temperature and water vapor content was mainly took place in the boundary layer below 800 m in summer. In contrast, the changes of air temperature and water vapor content in the boundary layer between 800 and 2000 m over the region mainly affected by the day-night alternating and the large-scale weather systems. In summer, wind speed in Hetao-Arid Region increased with height in the boundary layer below 300 m. Wind speed shear was easy to take place at 07:00-11:00 and 18:00-21:00 in the boundary layer below 500 m. In the boundary layer below 300 m, SSW wind prevailed in daytime, and southerly wind prevailed in nighttime, but the southeast wind always prevailed in the boundary layer from 300 to 2000 m. Meanwhile, the wind direction shear was prone to take place in the boundary layer below 300 m at 21:00-23:00 in summer. Due to the diurnal variations of solar radiation, land surface heating, surface evaporation and influence of the surface roughness, the vertical velocity over the Hetao-Arid Region increased with height in the boundary layer below 300 m at daytime and below 200 m at nighttime, but nearly did not change from 300 m to 2000 m boundary layer at daytime and nighttime in the summer.

• P412.2