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JOURNAL OF DESERT RESEARCH ›› 2017, Vol. 37 ›› Issue (4): 784-792.DOI: 10.7522/j.issn.1000-694X.2015.00284

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Palmer Drought Severity Index in April-June Reconstruction Based on Juniperus Tibetica Tree-ring during 1606-2012 in the Yangtze River Source Region,China

Huang Xiaomei1,2, Xiao Dingmu3, Qin Ningsheng1,4   

  1. 1. Heavy Rain and Drought-Flood Disasters in Plateau and Basin Key Laboratory of Sichuan Province, Chengdu Institute of Plateau Meteorology, China Meteorological Administration, Chengdu 610072, China;
    2. Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, Chengdu University of Information Technology, Chengdu 610225, China;
    3. Sichuan Provincial Meteorological Observatory, Chengdu 610072, China;
    4. Climate Center of Sichuan Province, Chengdu 610072, China
  • Received:2015-11-24 Revised:2015-12-17 Online:2017-07-20 Published:2017-07-20

Abstract: Tree-ring width standardized chronology is created by Juniperus tibetica which was collected in Lixin Township,Zhiduo County,Qinghai Province of China.Correlation analysis indicates that there is significantly positive correlation between PDSI (April-June) and tree-ring width (r=0.597,1960-2012).The tree-ring width standardized chronology is used to reconstruct PDSI in April-June in the Yangtze River source region for the period of 1606-2012,and it explaines the 36.0% of the total PDSI variance during the common period.There are ten wet periods and eleven dry periods in the reconstructed PDSI sequence over the past 407 years.Spatial analysis shows that the PDSI index in the Yangtze River source region has strong common signals for the north central Tibetan Plateau.Using the multi-taper method (MTM) spectrum analysis,it is found that the reconstructed PDSI has 30-50 a,3-3.3 a,2.1-2.7 a cycles.Correlation analysis shows that the dry-wet change of Yangtze River source region is closely related with simultaneous sea surface temperature anomalous in the central equatorial Pacific,the tropical Indian Ocean and the Kuroshio region of northwest Pacific.

Key words: Yangtze River source region, tree-ring width, PDSI

CLC Number: