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京津冀地区低层局地大气环流的气候特征研究
曾佩生1, 朱蓉2
(1.成都信息工程大学;2.国家气候中心)
Study on the Climatic Characteristics of Local Circulation in the Lower Atmosphere in Beijing-Tianjin-Hebei Region
Peisheng Zeng1, Rong Zhu2
(1.Chengdu University of Information Technology;2.National Climate Center)
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投稿时间:2018-01-22    修订日期:2018-12-21
中文摘要: 本文采用2007-2016年的中尺度数值模拟结果和15个地面气象观测资料,定义了局地大气环流表征风速,研究京津冀平原地区局地大气环流日变化的气候特征,并其对区域大气污染及其输送的影响进行分析。此外,对2016年12月30日至2017年1月7日北京地区跨年大气重污染过程进行了个例分析。得到结论:京津冀平原地区低空风场变化是天气系统与局地大气环流共同作用的结果,山谷风环流致使太行山和燕山沿线平原地区大气边界层内的长年主导风向为偏北和偏南;京津冀平原地区山谷风环流本身呈顺时针旋转的日变化特征,夜间至早晨谷风转向山风,午后至夜间山风转向谷风;在午后谷风向山风转向期间,容易形成沿太行山东麓和燕山南麓、自南向东北的“弓形”气流输送通道,此气流输送通道在1月份于21时左右形成,持续时间大约3小时,在7月份于18时左右形成,持续时间可达9小时;冬季午后至晚间盛行谷风时,受山体的阻挡,污染物容易在山前累积,导致污染浓度增高;夏季同样的情况会发生在后半夜。
Abstract:Based on mesoscale numerical simulation data and 15 surface meteorological observations data from 2007 to 2016, the reference wind of local circulation is defined, and the climatic characteristics of the daily variation of the local circulation in the Beijing-Tianjin-Hebei region are analyzed, it also analyzes the influence of air pollution and transportation in this area. In addition, a case of the atmospheric heavy pollution process in Beijing area from December 30th, 2016 to January 7th, 2017 was studied in this paper. The conclusions are as follows: The change of the lower wind field in the Beijing-Tianjin-Hebei region is the result of the interaction between the atmospheric circulation and the daily variation of the local circulation, the mountain valley Breeze leads to the long leading wind direction in the atmospheric boundary layer along the plains of Taihang Mountain and Yanshan, which is north and south; The daily variation of the mountain valley Breeze of the Beijing-Tianjin-Hebei region has the characteristics of clockwise change, mountain wind turn to valley wind in the night to morning, and valley wind turn to mountain wind in the afternoon to night; In the afternoon, during the turn in the valley wind to mountain wind, the "bow" airflow passage along east side of the Taihang Mountain and southern side of the Yanshan and from southwest to northeast is easy to form; The airflow channel was formed at about 21 in January and lasted about 3 hours, it formed at about 18 in July and lasted about 9 hours; During the winter afternoon to the evening, the valley wind is very strong, it makes the pollutants accumulate easily in the front of the mountain by the barrier of the mountain and causing the pollution concentration to increase; the same situation will occur in the summer after midnight.
文章编号:201801220051     中图分类号:    文献标志码:
基金项目:大气重污染成因与治理攻关项目“区域大气承载力与空气质量改善路径”
引用文本:
曾佩生,朱蓉,0.[en_title][J].Meteor Mon,():-.
Peisheng Zeng,Rong Zhu,0.Study on the Climatic Characteristics of Local Circulation in the Lower Atmosphere in Beijing-Tianjin-Hebei Region[J].Meteor Mon,():-.