贾春晖,窦晶晶,苗世光,王迎春. 2019. 延庆-张家口地区复杂地形冬季山谷风特征分析[J]. 气象学报, (0):-, doi:10.11676/qxxb2019.033
延庆-张家口地区复杂地形冬季山谷风特征分析
Analysis of the Characteristics of Mountain-Valley Wind in the Complex Terrain over Yanqing—Zhangjiakou Area in Winter
投稿时间:2018-06-28  修订日期:2018-09-28
DOI:10.11676/qxxb2019.033
中文关键词:  山谷风,复杂地形,风持续性,小风天,局地风,冬季
英文关键词:mountain-valley wind,complex terrain,wind persistence,fair weather day,local wind, winter
基金项目:国家自然科学基金,北京市科技计划课题
作者单位E-mail
贾春晖 中国气象科学研究院中国气象局北京城市气象研究所 chjia@ium.cn 
窦晶晶 中国气象局北京城市气象研究所 jjdou@ium.cn 
苗世光 中国气象局北京城市气象研究所 sgmiao@ium.cn 
王迎春 北京市气象局 ycwang@bjmb.gov.cn 
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中文摘要:
      基于2016年12月至2017年2月和2017年12月至2018年2月两年冬季的近地面自动站逐时观测数据以及张家口探空数据分析延庆-张家口一带(包括张家口崇礼、赤城、海坨、小五台山区,延怀、怀涿、洋河、蔚县盆地以及北京延庆、昌平、怀柔部分平原地区)复杂地形的风场精细化时空分布特征,揭示不同复杂地形下局地风场的时空变化规律,加深对复杂地形动力、热力作用对近地面风场影响的认识,为冬季山区风场预报以及复杂地形数值模式改进提供参考。结果表明:晴朗小风天风持续性作为矢量平均风速和标量平均风速的比值,可以作为研究风场变化规律的重要参数。根据风持续性的日变化特征,可以将研究区域内所有站点分为10种类型,分别代表了不同局地地形特征的影响,风持续与风向变化的相关性也很大。研究区域主要有三种类型的地形风:斜坡风、峡谷风以及较大尺度的山区平原风;不同地形特征下的风场、风持续性存在明显不同的日变化特征,山风和谷风相互转化的时间也有所差异,山区最早,盆地次之,平原区最晚;山风时段持续时间较谷风时段长,风速小;晴朗小风天实测风反映了实际风场的特征,而排除环境背景风场,弱化地形动力作用后整个冬季的局地风作为理论山谷风,更能反映热力作用下的山谷风特征。
英文摘要:
      Based on hourly fine-scale surface automatic weather stations (AWSs) data with study area and sounding data over Zhangjiakou during two years winter (form Dec,2016 to Feb,2017 and Dec,2017 to Feb,2018), the spatial and temporal characteristics of wind field in the complex terrain over Yanqing to Zhangjiakou area (including Chongli, Chicheng, Xiaowutai Mountain, Yuxian, Zhuolu, Huailai Basin, and Beijing Yanqing, Changping, Huairou District) are analyzed. It reveals the temporal and spatial variation of the local wind field under different complex terrains, and deepens the understanding of the influence of complex terrain dynamics and thermal effects on the near-surface wind field, and provides reference for the winter mountain wind field forecasting and the improvement of complex terrain numerical models. Results show that for fair weather days, wind persistence, as the ratio of vector mean wind speed and scalar mean wind speed, can be used as an important parameter to study the variation of wind field. According to the significant diurnal variations in wind persistence during fair weather days, all stations in the study region can be divided into 10 distinctive patterns, representing different influence of the local topographic features, and the correlation between diurnal variation of wind persistence and wind direction is very large. There are three types of topography-wind in the study region: Slope Wind, Valley Wind and Mountain-plain Circulation.The scale of the Mountain-plain Circulation is larger than the former two. The diurnal characteristics of the wind field and the wind persistence vary significantly with different topographical features, and the mutual transition time of mountain and valley winds is also different. In the mountains, the mutual transition time is the earliest, followed by the basins, and the plain areas are the latest. The duration of mountain wind period is longer than valley wind and the wind speed of mountain wind is smaller than the valley wind. While the measured winds during fair weather days reflects the characteristics of the actual wind field, the local winds eliminating the environmental background wind field and weakening the effect of topographic dynamics during the whole wintertime used as the theoretical valley wind can reflect characteristics of the thermally driven Mountain-Valley Wind better.
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