干旱区研究2017，Vol.34Issue(2)：316-323,8.DOI:10.13866/j.azr.2017.02.10
近54a中国北方严寒期时空变化特征及其影响因素
Spatiotemporal Change of Cold Periods and Their Affecting Factors in North China in Recent 54 Years
摘要
Abstract
In this study,the spatiotemporal change of cold periods and their affecting factors in north China in recent 54 years were studied based on the daily temperature data and statistical data of pentad mean temperature from 269 meteorological stations in north China during the period of 1960-2014,using the linear trend estimation,Mann-Kendall (M-K) test,accumulated variance analysis,Morlet wavelet spectra and correlation analysis.The results showed that the start pentads of cold periods were postponed,their ending pentads were advanced,and their durations were shortened in north China in recent 54 years,in which the postponement of starting pentads was the most significant in northwest China,the advancement of ending pentads was the most prominent in north China,and the shortening of cold periods was the longest in north China.The spatial difference of cold periods was significant,that means,from the south to the north,the starting pentads were advanced,the ending pentads were postponed,the postponement of could periods was more prominent,and the regions with shortening of cold periods were more than those with postponement of could period.The mutation and wavelet analysis revealed that the abrupt change of cold periods occurred during the period from the late 1980s to the early 1990s in north China,and there were the dominant periods of 4.00,7.09 and 3.19 years of cold periods in northeast China,north China and northwest China respectively.In addition,the cold periods were prolonged for 1.30 pentads when latitude was increased by 1 °;the indexes of northern hemisphere polar vortex area and of the Asian polar vortex area were the important factors resulting in the change of cold period in north China.关键词
严寒期/时空变化/Morlet小波功率谱/中国北方Key words
cold period/spatiotemporal variation/Morlet wavelet power spectrum/north China引用本文复制引用
冯青荣,刘普幸..近54a中国北方严寒期时空变化特征及其影响因素[J].干旱区研究,2017,34(2):316-323,8.基金项目
国家自然科学基金项目(40961035) （40961035）
甘肃省自然科学基金项目(0803RJZA094) （0803RJZA094）
