沙漠与绿洲气象2017，Vol.11Issue(3)：79-85,7.DOI:10.12057/j.issn.1002-0799.2017.03.011
近50a山东中部地区四季开始日期及长度变化特征
Variation Characteristics of the Beginning Dates and Length of Different Seasons in the Middle Area of Shandong Province in Recent 50 years
摘要
Abstract
The spatial and temporal variation characteristics of beginning dates and length of the seasons in the middle area of Shandong province in recently 50 years were analyzed,using methods of 5-day overlapping mean air temperature,climate trending rate,Mann-Kendall and empirical orthogonal function based on daily air temperature data from eight weather stations. The results showed that the beginning dates of spring and summer had advanced trends over time,which were delayed in autumn and winter,and the abrupt changes in beginning dates of summer and winter both occurred in 1993. The main spatial variations of beginning dates of different seasons were consistent,the change intensity center of autumn was in the north central plains,and the other seasons were in the central regions. The second eigenvector of spatial variation of beginning dates of different seasons presented different spatial variations. Days of winter were the most,followed by summer,and spring was the least. It presented decreased trends over time in spring and winter, which was significant in winter over a climate trending rate of -2.98 d/10 a. It showed increased trends over time in winter and autumn,and which was more significant in summer. The main spatial variation days of four seasons were consistence,the intensity center was in the central regions. The second eigenvector of spatial variation days of four seasons presented different spatial variations,especially between southern mountain areas and other regions of the days of summer and autumn.关键词
四季开始日期/四季长度/时空变化/气候趋势Key words
season beginning dates/season length/temporal and spatial variation characteristics/climate trending rate引用本文复制引用
环海军,刘岩,姚丹丹,夏福华..近50a山东中部地区四季开始日期及长度变化特征[J].沙漠与绿洲气象,2017,11(3):79-85,7.基金项目
山东省气象局气象科学技术研究项目(2016sdqxm13)资助. （2016sdqxm13）
