地理学报 ›› 1989, Vol. 56 ›› Issue (3): 334-342.doi: 10.11821/xb198903009

• 论文 • 上一篇    下一篇

利用树木车轮资料重建西藏中部过去气候的初步尝试

吴祥定, 孙力, 湛绪志   

  1. 中国科学院,国家计委,地理研究所,北京
  • 收稿日期:1988-09-01 出版日期:1989-07-15 发布日期:1989-07-15
  • 基金资助:
    国家自然科学基金

A PRELIMINARY STUDY ON RECONSTRUCTING PASTCLIMATE IN THE MIDDLE XIZANG PLATEAU BYUSING TREE-RING DATA

Wu Xiangding, Sun Li, Zhan Xuzhi   

  1. Institute of Geography. Chinese Academy of Sciences, Beijing
  • Received:1988-09-01 Online:1989-07-15 Published:1989-07-15

关键词: 树木年轮气候学, 年轮年表, 气候重建

Abstract: Based on four tree-ring chronologies which have been analysed with appropriate collec-tion and accurate dating in four sites of the middle Xizang plateau, an essential process on re-construction of past climate has been pointed out in this paper. First, the response functionof each dendrochronology has been built and used to estirnate how ring-width growth res-ponds to variations in monthly climatic change. The response values to air temperature andrainfall appear significant and reliable results, and the multiple correlation coefficients of theresponse regression for three dendrochronologies are more than 0.85. Second, the climate fac-tors which could be reconstructed with different tree--ring series have been se1ected. The fourclimate predicands are precipitation in growing season, temperature in Spring, annual tem-peraturc and annual precipitation, respectively, for four tree-ring series. Then, the transferfunction equation, including a new set of orthogonal variables, can be used to reconstruct localpast temperature or precipitation. The orthogonal translation is adopted by Emperical Or-thogonal Function (EOF). It should be emphasized that prior growth has been considered inthe relationship between climate factor and tree-ring chronology. That means the prior growth,the lag one through three years, has been put into the final f regression equation as indepen-dent factors. Besides, some different periods for calibration,and verification have been divi-ded. Some statistics and other kind of proxy data have been adopted as test approaches. Al1statistical and other--data test has proved that the reconstruction of past climate using tree-ringdata in the middle Xizang plateau is reasonable and reliable. The basic procedure could beapplied to dendroclimatic analysis in other areas.

Key words: dendroclimatology, tree-ring chronology, climate reconstruction