气候变化背景下甘肃南端的降水变化特征  

Characteristics of Precipitation Change in Southern Part of Gansu Under the Background of Climate Change

作　　者：折远洋[1,2] 王凤鹏 杨磊[1] She Yuanyang;Wang Fengpeng;Yang Lei(School of History Culture and Tourism,Longnan Teachers College,Longnan 742500,China;School of Geography and Environment,Jiangxi Normal University,Nanchang 330022,China)

机构地区：[1]陇南师范高等专科学校历史文化与旅游学院,甘肃成县742500 [2]江西师范大学地理与环境学院,江西南昌330022

出　　处：《宁夏大学学报（自然科学版）》2023年第3期282-288,共7页Journal of Ningxia University(Natural Science Edition)

基　　金：甘肃省高等学校创新基金资助项目(2020B-365);陇南师范高等专科学校教学改革重点基金资助项目(JXGG2019003);甘肃省教育科学“十四五”规划基金资助项目(GS[2021]GHB1956)。

摘　　要：为研究甘肃南端的降水变化特征,基于陇南市1960-2019年逐日降水量资料,通过一元线性回归、累积距平、Mann-Kendall非参数检验、Morlet小波分析等方法,对该地区近60 a气候变化背景下的降水变化特征进行研究.结果表明,近60 a,陇南市降水量总体呈下降趋势,减少斜率为7 mm/10 a,年平均降水量为472.5 mm.全年降水量主要集中在6-9月的雨季,占全年降水量的65.9%,7月份降水量最大,四季降水量呈现不同的变化趋势.年、四季降水量总体突变不显著,持续性检验Hurst指数为0.7767,年降水量变化存在2个明显层次周期,分别为8,19 a.可为当地工农业生产提供参考.In order to study the characteristics of precipitation changes in the southern part of Gansu,the daily precipitation data of Longnan City in the region from 1960 to 2019 were used,and methods such as unary linear regression,cumulative anomalies,Mann-Kendall nonparametric tests,and Morlet wavelet analysis were used to obtain nearly 60 a.The characteristics of precipitation changes under the background of climate change have been studied.The results show that in the past 60 years,the precipitation in Longnan City has shown an overall downward trend,with a decrease slope of 7 mm/10 a,and an average annual precipitation of 472.5 mm.The annual precipitation is mainly concentrated in the rainy season from June to September,accounting for 65.9%of the annual precipitation.The precipitation in July is the largest,and the precipitation in the four seasons shows different trends.The annual and four-season precipitation changes are not significant.The Hurst index of the continuous test is 0.7767.There are two obvious levels of annual precipitation changes,8 years and 19 years respectively.By understanding the characteristics of precipitation changes in this area in the past 60 years,it provides certain guidance for local industrial and agricultural production.

关 键 词：甘肃南端 降水量 季节变化 突变分析 周期分析 

分 类 号：P426.6[天文地球—大气科学及气象学]