华北地区大雾的天气学分析

兰州大学机构库 >大气科学学院

	华北地区大雾的天气学分析
Alternative Title	Synoptic Analysis of Heavy Fog in North China
	马骥
Subtype	学士
Thesis Advisor	尚可政
	2016-05-16
Degree Grantor	兰州大学
Place of Conferral	兰州
Degree Name	学士
Keyword	大雾天气华北地区气候特征天气形势诊断分析
Abstract	本文利用华北地区2001年至2014年的雾资料，同期高空、地面资料和物理量场，分析了华北地区大雾天气的气候特征，研究了大雾天气的环流背景，并分析了典型大雾过程的地面气象要素条件和动力、热力、水汽的结构特征，结果表明：2009年以前华北地区大雾发生次数围绕平均值波动，从2010年开始大雾次数有明显的减少。华北地区大雾天气主要发生在秋冬季节， 12月份是大雾出现最多的月份。大雾高发区呈东北-西南向的带状分布，包括河北省中部和南部，山西省东南部和西南部以及天津地区。华北地区大雾天气的典型天气形势主要有高压前部型，冷锋型，均压场型和倒槽型。大雾发生时，地面风速微弱，温度露点差较小，近地面空气达到或接近饱和。在动力场上，低层空气的辐合上升和高层空气的辐散下沉有利于大雾的维持。湿度场上表现为“上干下湿”，低层一般有一个水汽聚集的过程。
Other Abstract	By using the data of fog from 2001 to 2014, the climate character and the circulation background of fog in north China were analyzed. Also the surface meteorological elements, the dynamical, thermodynamic and vapor structure of typical fog processes were described. The results showed that the frequencies of fog fluctuated around the average value before 2009 and decreased significantly since 2010. The fog in north China mainly occurred in autumn and winter and mostly in December. The high frequency areas, including the central and southern Hebei, southeast and southwest Shanxi and Tianjin, were located nearly from southwest to northeast. The weather situations were divided into 4 main types: front of high pressure type, cold front type, uniform pressure field type and inverted through type. When the foggy weather formed, the surface wind speed was small with the near surface air approached or had attained saturation. In dynamic field, there were convergence and upward motion in the lower layer and the opposite motion in the higher layer. In humidity field, the lower layer was more humid and there was usually a vapor gathering process in the lower atmosphere.
URL	查看原文
Language	中文
Document Type	学位论文
Identifier	https://ir.lzu.edu.cn/handle/262010/199944
Collection	大气科学学院
Recommended Citation GB/T 7714	马骥. 华北地区大雾的天气学分析[D]. 兰州. 兰州大学,2016.

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