摘要
利用NCEP/NCAR再分析资料、地面气象观测资料,重点分析了2013年1月成都地区一次重污染天气过程的天气背景以及地面气象要素演变。结果表明:(1)此次持续的污染天气出现在高空为弱脊控制且位势高度场异常偏高,地面处于变性高压脊或均压场且近地面层风速较弱的静稳天气背景下。(2)产生此次高污染(高AQI)的地面气象条件为:地面冷高压逐渐变性,近地面温度升高,海平面气压降低,近地面相对湿度升高至80%左右,无降水或弱降水,能见度将降低至于10km以下,地面风速减弱。(3)中低层弱风速,弱的水平风垂直切变,700h Pa层附近和近地面层的逆温层,不利于污染物在垂直方向上的扩散,使得污染进一步加剧。
An analysis of the circulation situation and the evolution of ground meteorological elements during a heavy polluted weather process in Chengdu in January 2013 is performed by using the meteorological observational data and NCEP/NCAR 1o × 1o reanalysis data. It is found that：（ 1） The continuous polluted weather process occurred under the static stability weather background of the control of weak high-pressure ridge and geopotential height fields are extremely high,and locating in the degraded cold high pressure fields or uniform pressure fields and wind fields is weak on surface.（ 2） the surface meteorological characteristics of the serious polluted weather process are： the surface cold high pressure gradually degenerates,surface temperature becomes higher,sea level pressure decreases,The relative humidity increases to about 80%,no precipitation or weak precipitation,visibility decreases to even below 10 km,ground wind speed weakens.（ 3） the low-level meteorological characteristics of weak wind,weak vertical wind,and the existence of inversion on the ground and 700 h Pa altitude make the pollutants hard to spreading in the vertical direction,and make the pollution further aggravating.
出处
《高原山地气象研究》
2016年第4期75-78,共4页
Plateau and Mountain Meteorology Research
基金
2015年中国气象局气候变化专项CCSF201532
关键词
雾霾
气象要素
污染天气
haze
meteorological characteristics
polluted weather
