2012年11月大气环流和天气分析  

Analysis of the November 2012 Atmospheric Circulation and Weather

作　　者：黄威 

机构地区：[1]国家气象中心,北京100081

出　　处：《气象》2013年第2期259-264,共6页Meteorological Monthly

摘　　要：2012年11月环流特征如下:北半球极涡呈单极性分布,中心位于加拿大北部地区;欧亚中高纬环流经向度较大;南支槽平均位置大致位于90°E附近,且东移频繁;同时,副热带高压较常年同期偏强,位置偏西、偏北。11月,全国平均降水量为31.7 mm,比常年同期(18.8 mm)偏多68.6%。全国平均气温为2.0℃,比常年同期(2.9℃)偏低0.9℃。月内,出现4次全国范围中等强度冷空气过程和3次暴雨过程;华北、东北和内蒙古地区出现大范围强降雪和降温天气,其中华北大部地区出现今年冬半年首场降雪天气,京津地区、河北、内蒙古等地均出现极端降水;江南、华南出现持续阴雨寡照天气。The following are the main characteristics of the general atmospheric circulation in November 2012. There was one polar vortex center in the Northern Hemisphere, which was located in the northern Canada. The circulation presents meridional patterns in middle-high latitudes. The average south baranch trough is located at 90°E nearby and eastward shift is frequently. The subtropical high is stronger than normal years＇. The monthly mean precipitation is 31.7 mm, and 68.6% more than normal （18.8 mm）. The monthly mean temperature is 2.0℃, and 0.9℃ lower than normal （2.9℃）. There were four cold air processes nationwide and three rainfall processes in the month. The northern areas of China suffered from a wide range of heavy snowfall and chilling weather. Most areas of North China usher in the first snowfall this year, in Beijing, Tianjin, Hebei, Inner Mongolia and other places have suffered from extreme precipitation. Meanwhile, a large-scale persisting rainy weather happened in the southern China.

关 键 词：冷空气 低温 持续阴雨 强降雪 

分 类 号：P458[天文地球—大气科学及气象学]