摘要
利用1958—2012年33个浙江沿海气象站资料,统计分析浙江沿海大雾时空分布特征和生、消特点,以及沿海大雾与地面风向风力的关系。得出以下结论:年均出现大雾10天以上的有28个站,整个沿海地区分布比较均匀;1971—2012年浙江沿海年平均有51.7天6个以上的基准站出现大雾,且有较明显的年际特征;沿海大雾有明显的季节性和月际变化,以春季和初夏出现次数最多;沿海大雾有明显的日变化特征,23:00至次日06:00是大雾生成的主要时段,而大雾消散时间主要集中在06:00—10:00。沿海大雾大部分在南风条件下发生,一般风力小于12m/s。文中还分析了2005—2011年出现沿海大雾时的天气形势,发现浙江处在入海变性冷高压西部、地面低压倒槽东部、静止锋或冷锋前部、弱高压底部、鞍形场,日本海高压西南部等6种天气形势下容易出现沿海大雾。
By use of the data of 33 coastal weather stations in Zhejiang from 1958 to 2012,the occurrence and dissipation characteristics of coastal fogs and the relationship between coastal fog and surface wind are analyzed.The results show that the annual mean number of fog days is over 10 days at 28 stations and the distribution in the whole coastal area is relatively uniform.The annual mean number of coastal fog days in Zhejiang is 51.7days from 1971 to 2012,which presents obvious inter-annual characteristics.The coastal fog also has seasonal and monthly variation.The number of fog days is the greatest in spring and early summer.Coastal fogs have obvious diurnal variation:mainly form from 23:00to 06:00and dissipate from06:00to 10:00.Coastal fogs occur mostly under the southern wind condition with the wind speed being less 12.0m/s.The weather situations corresponding the coastal fogs from 2005 to 2011are analyzed.The main circulation patterns for fog occurrence include the western extratropical cold-core high,the surface inverted trough,the forepart of the stationary front or cold front,the bottom of weak high pressure,saddle field,and the southwest Japan Sea high.
出处
《气象科技》
北大核心
2017年第2期324-330,共7页
Meteorological Science and Technology
基金
浙江省重大科技专项(2011C13044)
中国气象局预报员专项(CMAYBY2015-030)资助
关键词
沿海大雾
时空分布
气候特征
天气形势
coastal fog
spatial and temporal distribution
climate characteristic
weather situation
