摘要
利用江西省气象信息中心提供的1970-2016年逐日庐山站电线积冰、NOAA重构延长的逐月海表温度(SST)及NCEP再分析风场等资料,采用线性趋势分析、Man-Kendall检验、Morlet小波分析、合成分析等方法,研究了庐山雨凇积冰日数的变化特征及其与海气场的关系,结果表明:1)庐山雨凇积冰基本发生在当年11月至次年3月。2)雨凇积冰日数总体呈显著下降趋势,且在1981年和2001年分别存在一显著突变,即1970-1980年庐山雨凇积冰日数异常偏多,1981-2001年庐山雨凇积冰均值基本接近常年,2001-2005年庐山雨凇又异常偏少。3)庐山雨凇积冰日数存在2~4年、6~8年及20年左右的振荡周期,2~4年周期变化在20世纪70年代、80年代末到90年代末及2005年以后振荡显著。4)庐山雨凇积冰异常偏多年代,前期410月整个热带太平洋海温异常偏低,同期113月庐山受贝加尔湖异常反气旋东南侧东北气流和来自东太平洋偏南气流的共同影响,有利于出现雨凇积冰。
Using the 19702016 daily ice accumulation on power lines at Lushan Station,which were offered by Jiangxi Weather Information Center,the monthly sea surface temperature(SST)data from the NOAA reconstruction and the NCEP wind reanalysis data,and the methods of linear trend analysis,Man-Kendall test,Morlet wavelet analysis and synthetic analysis,this article studied the variation characteristics of the number of glaze icing days in Lushan Mountain and its relationship with sea and air fields.The results show that:1)The accumulated glaze icing in Lushan Mountain tends to occur from November to the next March.2)The number of days of glaze ice accumulation in Lushan Mountain shows a significant downward trend,and there were two points of abrupt change;it’s in 1981 and 2001.That is,from 1970 to 1980,the number of glaze ice deposition days in Lushan Mountain was abnormally on the high side,but from 1981 to 2001,the average glaze ice accumulation in Lushan Mountain was basically close to normal.Later,from 2001 to 2005,there was an unusually low accumulation of glaze ice in Lushan Mountain.3)There are quasi-periodic changes of 24 years,68 years and 20 years in the glaze icing days of Lushan Mountain.The 24 year oscillations were significant in the 1970s,from the late 1980s to the late 1990s as well as after 2005.4)In the years with abnormal glaze icing days in Lushan Mountain,the SSTs in the tropical Pacific are unusually low from April to October.Then from November to the next March,the Lushan Mountain region is jointly affected by the northeastern airflow from the southeastern side of the Baikal anomalous anticyclone and the southerly airflow from the coast of eastern China,favoring the occurrence of glaze icing accumulation.
作者
章开美
龙余良
周雨
汪如良
詹华斌
李煜姗
Zhang Kaimei;Long Yuliang;Zhou Yu;Wang Ruliang;Zhan Huabin;Li Yushan(Jiangxi Meteorological Service Center,Nanchang 330096,China)
出处
《气象与环境科学》
2020年第1期75-80,共6页
Meteorological and Environmental Sciences
基金
2019年江西省重点项目(2019010)
2017年江西省面上项目“庐山雨凇景观预报方法研究”(2017024)
关键词
庐山
雨凇积冰
变化特征
海温指数
Lushan Mountain
glaze icing
change characteristics
SST index
