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气象:2016,42(3):372-381
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江西省区域性平流雾气象要素特征分析及预报思路
(江西省气象台,南昌 330046)
Analysis on the Characteristics of Meteorological Factors and Forecast Ideas for Regional Advection Fog in Jiangxi
(Jiangxi Meteorological Observatory, Nanchang 330046)
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投稿时间:2015-05-07    修订日期:2016-01-05
中文摘要: 利用江西省2000—2012年常规地面观测资料及探空资料,采用合成和统计方法,分析了54次区域性平流雾的天气形势及气象要素,得到了平流雾逆温层、温湿条件、低层风场及影响系统等统计特征。结果表明:(1)江西省区域性平流雾主要发生于2—3月,北部多于南部。(2)其形势特征为:江南地区低层有较明显的暖湿平流。850 hPa上的切变线或辐合区位于长江流域到江淮一带,925和850 hPa西南风速分别达3~8和7~15 m·s-1。地面形势多为弱低压倒槽和锋面前部的低压,其次为高压底部。(3)850 hPa以下低层有相对湿度≥80%的湿层, 500 hPa中层多数有相对湿度≤50%的干层。地面气温和露点多在10~16℃,且达到近饱和。(4)平流雾的逆温结构以单层逆温为主,多数比辐射雾逆温层高、厚度大。逆温强度主要在1~3℃。最后给出了江西平流雾(我国南方)的预报着眼点或预报思路。
Abstract:Based on the 2000-2012 conventional surface observations and sounding data in Jiangxi Province, this paper analyzed 54 regional advection fog weather events and meteorological factors by using the synthetic and statistical method, obtaining the statistical characteristics of the advection fog temperature inversion layer, temperature and humidity conditions, low level wind field and the impact system. The results showed that: (1) The Jiangxi regional advection fog mainly occurs in February and March, seen more in the north than in the south. (2) The situation features are as follows: The low level of Jiangnan Region has obvious warm and humidity advection, the shear line or convergence zone at 850 hPa is located in the region from Yangtze River to Jianghuai, the southwest wind speed at 925 hPa and 850 hPa is up to 3-8 m·s-1 and 7-15 m·s-1 respectively. Surface situation is mostly inverted trough and low pressure in the forepart of cold front, followed by the bottom of high pressure.(3) The relative humidity is ≥80% below 850 hPa, while it is ≤50% in the middle layer at 500 hPa. The surface air temperature and dew point range within 10-16℃, and the air is nearly saturated.(4) The advection fog mostly has single temperature inversion layer, whose inversion layer is higher and thicker than radiation fog. The intensity of temperature inversion is mainly between 1℃ and 3℃. Finally, the forecast focuses and forecast ideas of advection fog weather in Jiangxi (South China) are put forward.
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基金项目:中国气象局气象关键技术集成与应用面上项目(CMAGJ2013M26)资助
引用文本:
许爱华,陈翔翔,肖安,许彬,2016.江西省区域性平流雾气象要素特征分析及预报思路[J].气象,42(3):372-381.
XU Aihua,CHEN Xiangxiang,XIAO An,XU Bin,2016.Analysis on the Characteristics of Meteorological Factors and Forecast Ideas for Regional Advection Fog in Jiangxi[J].Meteor Mon,42(3):372-381.