RECONSTRUCTING MIDDLE-TIBET CLIMATE DURING THE LAST 600 YEARS BY DENDROCLIMATOLOGICAL METHOD
RECONSTRUCTING MIDDLE-TIBET CLIMATE DURING THE LAST 600 YEARS BY DENDROCLIMATOLOGICAL METHOD
复制标题
DOI：
--
复制
发表时间：
1990
期刊：
影响因子：
--
通讯作者：
吴祥定;湛绪志;孙力;程志刚
中科院分区：
文献类型：
--
作者：
吴祥定;湛绪志;孙力;程志刚
本文以青藏高原中部地区4个树木年轮年表为基础，通过合理的收集和精确的定年，提出了重建气候的基本步骤：首先建立各年轮年表的响应函数，并利用该函数估计树宽生长对月气候变化的响应;其次，建立树宽生长对月气候变化的响应函数;最后，建立树宽生长对月气候变化的响应函数，并利用树宽生长对月气候变化的响应函数，建立树宽生长对月气候变化的响应函数。选取了不同年轮序列所能反映的气候因子，建立了包含一组新的正交变量的传递函数方程，可以用来重建当地过去的温度或降水量。需要强调的是，在气候因子与树木年轮年代学的关系中考虑了先验生长，在此基础上，划分了不同的时间段进行校正和验证，并采用统计学和其他代用资料作为检验手段，结合同一类型的树轮序列，重建了西藏中部近600年来气温和近340年来降水的变化。
Based on four tree-ring chronologies which was analyscd with appropriate collection and accurate datingin the middle Tibetan Plateau,an essential procedure on reconstruction of past climate has been pointed outin this paper.First,the response function of each dendrochronology has been built and used to estimate howring-width growth responds to variations in monthly climatic change.Second,the climate factors which couldbe produced with different tree-ring series have been selected.Then,the transfer function equation,includinga new set of orthogonal variables,can be used to reconstruct local past temperature or precipitation.Itshould be emphasized that prior growth has been considered in the relationship between climate factor andtree-ring chronology,Besides,some different periods for calibration and verification have been divided.Andsome statistics and other kinds of proxy data have been adopted as test approaches.As a result,the variationsof air temperature during the last 600 years and precipitation during the last 340 years were reconstructedby combining the same types of tree-ring series in the middle Tibet.