摘要
2015年8月环流特征如下:北半球高纬地区极涡呈偏心型分布,亚洲中高纬度为两槽一脊环流形势,槽脊强度均强于常年同期;西太平洋副热带高压强度接近常年略偏强,位置偏西、偏南。8月全国平均降水量105.1 mm,接近常年同期(105.3 mm);全国平均气温为21.1℃,较常年同期(20.8℃)偏高0.3℃,上旬,江淮及其以南地区出现大范围持续高温。月内共出现5次主要区域性暴雨过程。8月共有4个热带气旋(风力8级以上)在西北太平洋和南海活动,其中,第13号台风苏迪罗登陆我国,台风生成和登陆个数均偏少。华北、西北地区东部及内蒙古中部等地气象干旱持续发展。全国多个省(区、市)遭受风雹灾害。
The main characteristics of the general atmospheric circulation in August 2015 are as follows:The polar vortex takes the form of eccentric pattern in the Northern Hemisphere.In the mid-high latitudes of Asia,the circulation presents a two-trough and one-ridge pattern,and all of those are more intense than their climatological means.The subtropical high lies westwards and southwards,and its intensity is equivalent to or a little stronger than its average state during the corresponding time of the normal years.Meanwhile,the monthly mean precipitation amount is 105.1 mm,which is almost close to the normal value(105.3 mm).The monthly mean temperature is 21.1℃,higher than its climatological mean(20.8℃).In the first dekad of August,long-lasting and large-scale high temperature events occur around Jianghuai region.Five regional torrential rainfall events mainly happen in August.Four tropical cyclones are active over the Northwest Pacific Ocean and the South China Sea,but only one of them lands China.Drought continuously is found in North China,eastern part of northwestern China and central Inner Mongolia.In addition,many cities suffer from strong wind and hail disaster.
出处
《气象》
CSCD
北大核心
2015年第11期1425-1431,共7页
Meteorological Monthly
关键词
大气环流
副热带高压
暴雨
高温
热带气旋
干旱
atmospheric circulation
subtropical high
torrential rain
high temperature
tropical cyclone
drought