违反了 PRIMARY KEY 约束 'PK_t_counter'。不能在对象 'dbo.t_counter' 中插入重复键。 语句已终止。 1981-2015年华北地区持续霾事件的特征及环流分类研究-Study on Characteristics and Classification of Circulation for Persistent Haze Events in North China during 1981-2015
doi:  10.3878/j.issn.1006-9585.2018.18016
1981-2015年华北地区持续霾事件的特征及环流分类研究

Study on Characteristics and Classification of Circulation for Persistent Haze Events in North China during 1981-2015
摘要点击 141  全文点击 89  投稿时间:2018-01-22  修订日期:2018-04-03
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基金:  
中文关键词:  华北地区 霾日数 持续霾事件 空间分布 环流特征
英文关键词:  North China, Haze events (HDs), Persistent haze events (PHEs), Spatial distribution, Circulation characteristics
           
作者中文名作者英文名单位
孟亚楠Meng Yanan大气所云降水物理与强风暴实验室(LACS)
孙建华Sun Jianhua大气所云降水物理与强风暴实验室(LACS)
卫捷大气所云降水物理与强风暴实验室(LACS)
赵琳娜中国气象科学研究院
引用:孟亚楠,孙建华,卫捷,赵琳娜..1981-2015年华北地区持续霾事件的特征及环流分类研究[J].气候与环境研究
Citation:Meng Yanan,Sun Jianhua..Study on Characteristics and Classification of Circulation for Persistent Haze Events in North China during 1981-2015[J].Climatic and Environmental Research(in Chinese)
中文摘要:
      根据1981-2015年华北地区地面基本气象要素定时值数据集和地面气候日值数据集站点资料,分别利用14时实测值法和目标区域极端事件的客观识别方法挑选霾日数和持续霾事件,并分析了它们的特征,然后对持续霾事件进行了分类研究。结果表明:(1)华北地区霾日数空间分布极不均匀,有4个大值区:吕梁山和太行山之间的河谷地区;沿太行山以东的平原;河南北部;环黄海和渤海区域。(2)华北地区共挑选出111个持续霾事件,其中,持续3-5天的个例最多,占了总数的86.5%,最长的事件可达12天。(3)持续霾事件和霾日数的空间分布特征相似,且存在明显的年、季变化。1981-2015年持续霾事件数呈增加趋势,冬季增加最显著,其次是秋季和春季,夏季最少。(4)结合地形、霾日数、持续霾事件的分布和环流特征把个例分为7类,对发生频次较多的四类(华北地区型,河南北部及太行山以东的京津冀地区型,河南北部型,河南北部及环渤海、黄海地区型)的环流进行了对比分析。其环流形势的主要特征包括:对流层的中低层华北地区为纬向西风气流或脊前西北气流,我国南部或东南部地区高压西部的西南气流与华北地区的偏西气流产生弱辐合下沉气流;近地面层由于地形的影响形成垂直环流圈,霾最严重的地区一般出现在地形的东坡和垂直环流圈的下沉支。近地面东南气流和低层的西南气流向该地区输送了暖湿空气和污染物。华北地区霾发生位置的不同,主要由低层我国东部或者南部高压的位置和强度,以及局地垂直环流的下沉支的位置决定。
Abstract:
      Based on the surface meteorological elements and climate daily station data from CMA (China Meteorological Administration) during 1981-2015 in North China, we use 14BST moment method and an objective identification technique for regional extreme events (OITREE) to select haze days (HDs) and persistent haze events (PHEs) respectively, and analyze their characteristics. Then PHEs are classified and studied. The major characteristics of PHEs’ are followings. (1) The spatial distribution of HDs in North China is extremely uneven, with four high value regions: the valley area between Lvliang mountains and Taihang mountains; the plain east of Taihang mountains; Northern Henan; gulf area of Bohai and Yellow Sea. (2) A total of 111 PHEs are identified in North China, with the longest one lasting 12 days. The PHEs lasting 3-5 days accounts for 86.5% of the total. (3) The spatial distribution of PHEs,which has obvious annual and seasonal variation,is very similar to that of HDs. The number of PHEs is increasing during 1981-2015, and it is the most obvious in winter, followed by autumn,spring and summer. (4) According to the characteristics of topography, HDs, PHEs and their circulation, PHEs can be categorized into seven types. We make a comparison for circulation with the high-frequency four types (North China; Northern Henan and the plain east of Taihang mountain; Northern Henan; Northern Henan and the gulf area of Bohai and Yellow Sea). Their major circulation characteristics of four type PHEs are revealed. In the mid-lower troposphere, North China was controlled by a zonal westerly airflow or northwesterly airflow in front of ridge, and a sinking motion is produced by a weak convergence which formed by a southwest airflow along the west of high pressure in south or southeast China and west airflow in North China. There is a vertical circulation near the surface due to the influence of topography, and the most severe haze areas generally appear in the east slope of the topography and the subsidence of the vertical circulation. Southeast airflow near the surface and southwest airflow in the lower troposphere transport moisture and pollutants into the haze area. The location of haze in North China is mainly determined by the position and intensity of high pressure in the eastern or southern China, as well as the location of the local sinking airflow in vertical circulation.
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