摘要
为了补充和完善贵州冻雨在初(终)日以及相关高度场等方面的特征,利用1964年10月—2014年4月贵州省冻雨观测资料和NCEP/NCAR再分析资料,分析了冻雨初日、终日和冻雨期的气候特征,及其高相关季节异常年北半球500 h Pa的高度距平场特征。结果表明:冻雨初日渐晚、终日渐早、冻雨期渐短;初日多出现在11月中旬—12月上旬,终日多出现在3月;冻雨初日异常年夏季北半球高度距平场主要表现为中高纬度槽脊强度的异常,反映为北美大槽强度相反的变化特征;冻雨终日冬季高度距平场反映为高纬度极涡中心位置和强度的变化;冻雨期异常年则表现为不同的遥相关型,偏少年反映为PJ波列,偏多年表现为ANA、NEP和AWE并存,在实际业务中可以结合该信号特征对其进行长期预测。
The paper aims to supplement and improve the features of the freezing rain in early（end） days andthe height field in Guizhou, by using the observation data and NCEP/NCAR reanalysis data of freezing rain inGuizhou from October 1964 to April 2014, this article researched climate characteristics of freezing rain＇sbeginning date, ending date and freezing rain period, also the features of northern hemisphere＇s heightanomaly fields at 500 h Pa of anomalous years in high correlated seasons. Results showed that： the beginningdates of freezing rain were gradually became later, the periods were became short, and the ending dates did notchange significantly. The beginning dates usually appeared between mid November to early December, and theending dates appeared in the March. In summers of years with abnormal beginning dates of freezing rain, thenorthern hemisphere＇s height anomaly mainly presented the characteristic of trough- ridge strength＇sabnormal in mid-high latitude, with changes opposite the intensity of north American trough; in winters ofyears with abnormal ending dates of freezing rain, height anomaly featured mainly by the position and intensityvariability of the polar vortex in high latitude. Freezing rain period showed different teleconnection, as the PJwave appearing in shorter years, and ANA, NEP and AWE coexisting in longer years. Combined with thesecharacteristics, the beginning ending date and period of freezing rain could be long- term predicted inpractice.
出处
《中国农学通报》
2015年第20期213-218,共6页
Chinese Agricultural Science Bulletin
基金
黔科合重大专项字(2011)6003号
黔科合院士站(2014)4010号
关键词
冻雨
初日
终日
冻雨期
环流特征
贵州
freezing rain
beginning date
ending date
freezing rain period
circulation characteristics
Guizhou
