| 科尔沁沙地春季冷锋过境的地面风况特征 |
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| 引用本文： | 韩广,尤莉,程玉琴.科尔沁沙地春季冷锋过境的地面风况特征[J].中国沙漠,2016,36(4):1087-1096. |
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| 作者姓名： | 韩广 尤莉 程玉琴 |
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| 作者单位： | 1. 湖南师范大学 资源与环境科学学院, 湖南 长沙 410081;2. 内蒙古自治区气候中心, 内蒙古 呼和浩特 010051;3. 乌兰察布市气象局, 内蒙古 乌兰察布 012000 |
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| 基金项目： | 国家自然科学基金项目（41271025） |
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| 摘 要： | 对13个气象台站2014年5月上旬逐时风况的分析发现：（1）受高空槽和地面低压的影响，科尔沁沙地冷锋过境时瞬时风速8h内快速增加到10m·5s-1以上，风向转为西北风；（2）上风向锡林郭勒草原的冷锋推进速度约为12.5m·5s-1，科尔沁沙地主体部分则降到9.21m·5s-1，总体推进速度因地而异；（3）风速的功率谱以大兴安岭东麓的林西县幅值最大，科尔沁左翼后旗最小；（4）沙地和草原两地区分别存在区域性10h、25h和2h、4h周期性，而冷锋过境引起的强风周期性不明显；（5）常年稳定而频繁的冷锋过境，不仅造成了沙丘的形态变化和不同程度的位移，而且还塑造和维持着该区沙丘群的多种空间格局。
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| 关 键 词： | 科尔沁沙地 冷锋 风况 |
| 收稿时间： | 2016-05-16 |
| 修稿时间： | 2016-08-23 |
Characteristics of Ground Wind Regimes in the Horqin Sandy Land when A Cold Front Passed in Spring |
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| Han Guang,You Li,Cheng Yuqin.Characteristics of Ground Wind Regimes in the Horqin Sandy Land when A Cold Front Passed in Spring[J].Journal of Desert Research,2016,36(4):1087-1096. |
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| Authors: | Han Guang You Li Cheng Yuqin |
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| Institution: | 1. College of Resources and Environmental Sciences, Hunan Normal University, Changsha 410081, China;2. Climatic Center of Inner Mongolia, Huhhot 010014, China;3. Meteorological Bureau of Wulanchabu City, Wulanchabu 012000, Inner Mengolia, China |
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| Abstract: | Based on hourly wind records of 13 weather stations in early May, 2014, the authors analyzed and discussed the primary tempo-spatial characteristics of ground wind regimes in the Horqin Sandy Land when typical cold fronts passed. The results showed that: (1) Controlled by troughs at high altitudes and ground low pressure, instantaneous velocity can increase quickly up to more than 10 m·5s-1 in 8 hours, and the direction turns to NW when a cold front passes over; (2) Along the prevailing wind direction, the speed of front advance attained 12.5 m·5s-1 in the upwind grassland, while 9.21 m·5s-1 in the sandy land, which the speed is varied with different locations; (3) With regard to the maximum entropy spectra of wind velocity, the largest value occurred to Linxi, and the smallest to Kezuohou Bannar;(4) There seem to be remarkable cycles of 2 h and 4 h, and somewhat 10 h and 25 h in Sandy Land and mountains, whereas the cycles of strong wind induced by cold fronts are not obvious; (5) Constant and frequent strong winds caused by cold fronts not only modify significantly morphology of dunes and drive robustly dune advance, but also sculpture and sustain spatial patterns of dunefields in the vast region. |
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| Keywords: | Horqin Sandy Land cold front wind regime |
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