A 457-year reconstruction of precipitation in the southeastern Qinghai-Tibet Plateau,China using tree-ring records  

作　　者：GOU XiaoHua YANG Tao GAO LinLin DENG Yang YANG MeiXue CHEN FaHu 

机构地区：[1]Key Laboratory of Western China's Environmental Systems(Ministry of Education) and Research School of Arid Environment and Climate Change,Lanzhou University [2]State Key Laboratory of Cryospheric Sciences,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences

出　　处：《Chinese Science Bulletin》2013年第10期1107-1114,共8页

基　　金：supported by the National Natural Science Foundation of China (41171039 and 40890051);the Chinese NSFC Innovation Team Project (41021091);the One Hundred Talents Program of Chinese Academy of Sciences (29O827B11);the Program of Introducing Talents of Discipline to Universities from China’s Ministry of Education (B06026)

摘　　要：This paper presents a 457-year reconstruction of precipitation in the southeastern Qinghai-Tibet Plateau using tree-ring records.Tree-ring samples were collected from the Hengduan Mountains in the southeastern part of the Qinghai-Tibet Plateau,China.A nearly 500-year chronology was developed using tree-ring width records.Correlation analysis shows moisture is the main factor limiting tree growth in this region.Ring-widths were significantly positively correlated with the Palmer Drought Severity Index(PDSI) and precipitation in many months.The highest correlation coefficient was found between the annual growth of trees and precipitation from the previous September to the current June(0.738).Based on this relationship,we reconstructed the precipitation history from 1509 to 2006.The reconstruction explains 54.4%(Radj2=53.5%,N=49,F=56.12) of the actual precipitation variation during the calibration period(1958-2006).During the reliable period of the reconstruction(1549-2006),some low-frequency climate signals are included,indicating this region has been getting wetter in the last 20 years.The reconstruction documents six apparently dry and five pluvial periods and the 17th century dry period lasted longer than any other.When compared with other recent studies,this study and these earlier reconstructions show a similar trend in the variation of drought and pluvial.Further spatial correlation analysis confirms that the reconstructed precipitation adequately represents the rainfall history of the entire Hengduan Mountain area.The Multi-taper method,a type of spectral analysis,reveals that precipitation in this area had significant(P<0.01) spectral peaks at 3-5 a,60 a and 79-85 a.This paper presents a 457-year reconstruction of precipitation in the southeastern Qinghai-Tibet Plateau using tree-ring records. Tree-ring samples were collected from the Hengduan Mountains in the southeastern part of the Qinghai-Tibet Plateau, China. A nearly 500-year chronology was developed using tree-ring width records. Correlation analysis shows moisture is the main factor limiting tree growth in this region. Ring-widths were significantly positively correlated with the Palmer Drought Severity Index （PDSI） and precipitation in many months. The highest correlation coefficient was found between the annual growth of trees and precipitation from the previous September to the current June （0.738）. Based on this relationship, we reconstructed the precipita- tion history from 1509 to 2006. The reconstruction explains 54.4% （R2aaj=53.5%, N=49, F=56.12） of the actual precipitation varia- tion during the calibration period （1958-2006）. During the reliable period of the reconstruction （1549-2006）, some low-frequency climate signals are included, indicating this region has been getting wetter in the last 20 years. The reconstruction documents six apparently dry and five pluvial periods and the 17th century dry period lasted longer than any other. When compared with other recent studies, this study and these earlier reconstructions show a similar trend in the variation of drought and pluvial. Further spatial correlation analysis confirms that the reconstructed precipitation adequately represents the rainfall history of the entire Hengduan Mountain area. The Multi-taper method, a type of spectral analysis, reveals that precipitation in this area had significant （P〈0.01） spectral peaks at 3-5 a, 60 a and 79-85 a.

关 键 词：青藏高原东南部 降水重建 树木年轮 中国 降水量变化 树轮宽度 干旱指数 相关性分析 

分 类 号：P468.024[天文地球—大气科学及气象学]