| 近50年青海降水时空格局变化 |
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| 引用本文： | 白淑英,史建桥,相栋,王国恩.近50年青海降水时空格局变化[J].干旱区资源与环境,2013(6):148-153. |
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| 作者姓名： | 白淑英 史建桥 相栋 王国恩 |
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| 作者单位： | 南京信息工程大学遥感学院;94783部队61分队;山西省气候中心 |
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| 基金项目： | 公益性(气象)行业科研专项(GYHY201106044);江苏高校优势学科建设工程(PAPD)资助 |
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| 摘 要： | 利用青海省32个气象站1961-2010年逐月降水资料,结合线性倾向估计、距平分析和Mann-Kendall检验对降水量年际、月际分布及变化趋势进行分析,进而依据功率谱和GIS方法揭示该区降水量的振荡周期和空间格局。结果表明:50年来,青海年降水量总体上呈现小幅增加趋势,线性倾向率为3.3mm/(10a);年内降水主要集中在5-9月,占全年的86.1%,月际正负距平变化相对较大;年代际降水变化阶段性明显,特别是21世纪以来增加态势显著;Mann-Kendall检验表明近20年年降水量和四季降水量(除冬季),均呈增加趋势;青海降水量空间格局基本呈东多西少、南多北少形势,且该区大部分降水量线性倾向率大于1.5mm/(10a);功率谱分析则显示该区降水振荡周期为准2a和3-4a。
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| 关 键 词： | 降水 GIS 特征分析 时空格局 青海 |
Spatiotemporal pattern change of precipitation in Qinghai in the last 50 years |
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| BAI Shuying,SHI jianqiao,XIANG Dong,WANG Guoen.Spatiotemporal pattern change of precipitation in Qinghai in the last 50 years[J].Journal of Arid Land Resources and Environment,2013(6):148-153. |
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| Authors: | BAI Shuying SHI jianqiao XIANG Dong WANG Guoen |
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| Institution: | 1.College of Remote Sensing,Nanjing University of Information Science & Technology,Nanjing 210044;2.Unit 61,No.94783 of PLA,Changxing,Zhejiang 313111;3.Shanxi Province Climate Center,Taiyuan,Shanxi 030006,P.R.China) |
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| Abstract: | The variation characteristics and trend of annual and monthly precipitation in the past 50 years were analyzed based on the monthly precipitation of 32 stations during 1961-2010 in Qinghai province by using methods of linear trend analysis,Anomaly analysis and Mann-Kendall.The periodic oscillation and spatial distribution characteristics of precipitation variations were revealed by using power spectrum and GIS.The results showed that the variation trend of annual precipitation was slightly increasing in Qinghai during the 50 years,linear trend rate was 3.3 mm/(10a).The precipitation was mainly concentrated from May to September in the year,accounting for 86.1%,and the changes of positive and negative anomaly were also relatively large.It indicated that the decadal precipitation had obvious periodicity,and precipitation increased obviously in the 21st century.It revealed that annual and seasonal precipitation(except the winter) were on the rise in the past 20 years using Mann-Kendall method.The precipitation of Qinghai was under the distribution of north and west regions lack of precipitation while south and east regions abundant,and most of the region,linear trend rate of precipitation was above 1.5mm/(10a).Analysis of power spectrum showed that the quasi-periodic oscillation of precipitation was 2 years and 3-4 years. |
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| Keywords: | Mann-Kendall power spectrum GIS precipitation signature analysis |
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