摘要
Abstract
[ Objective ] The aim was to study the spatial-temporal characteristics and causes of cold wave in Qinhuangdao. [ Method ] Based on temperature data from five surface meteorological stations in Qinhuangdao from 1970 to 2009 and the latest standard of releasing cold wave early warning signal, statistical analysis on the regional distribution and secular variation of cold wave was carried out, and its causes were discussed preliminarily. [ Result] In Qinhuangdao from 1970 to 2009, the frequencies of blue and yellow cold wave were 2 334 and 105 times,respectively, and cold wave occurred most frequently in Qinglong County and least frequently in Lulong County, which was related to the effects of underlying surface, latitude and altitude. Cold wave might happen from September to next May, and the earliest occurrence date was September 9th , while the latest end date was May 26th. In a year, the frequency of cold wave was the highest in January and lowest in May.From 1970 to 2009, blue cold wave occurred most frequently in 1972 and 1979 and least frequently in 1984, while the frequency of yellow cold wave was the highest in 1979 and lowest in 9 years. From decadal variation, cold wave appeared most frequently in 1970s and least frequently in 1990s. With the increase of temperature, the frequency of cold wave showed decrease trend, and the beginning date tended to postpone,while its end date advanced, and it showed that the changes of cold wave was mainly caused by climate wanning. [ Conclusion ] The study could provide theoretical guidance for the meteorological disaster prevention and reduction and local agricultural service.关键词
寒潮/时空特征/成因分析/秦皇岛Key words
Cold wave/ Spatial-temporal characteristics/ Genetic analysis/ Qinhuangdao分类
天文与地球科学
