近2ka古里雅冰芯记录的温湿配置多尺度特征  

Multi-Scale Characteristics and Unsteadiness of Reconstructed Temperature and Ice Accumulation Records in Guliya Ice Core

作　　者：戴新刚[1] 尤莉 汪萍[1] 封国林[3] 

机构地区：[1]中国科学院 大气物理研究所 东亚区域气候-环境重点实验室,北京100029 [2]内蒙古气象局,呼和浩特010051 [3]中国气象局 国家气候中心 中国气象局气候研究开放实验室,北京100081

出　　处：《气候变化研究进展》2007年第3期167-171,共5页Climate Change Research

基　　金：国家重点基础研究发展规划项目(2006CB400504);中国科学院知识创新工程重要方向项目(KZCX3-SW-229);中国气象局气候变化专项(CCSF2005-2-QH34)资助

摘　　要：采用正交小波分解研究了近2ka来青藏高原古里雅冰芯记录的气温和冰川积累量演变多尺度特征,得到了与构成序列中主要气候事件对应的尺度分量。用130a尺度以上分量几乎可以重建冰芯记录中的主要冷暖或干湿气候事件。平均而言,温度和冰川积累量配置在大多数时间尺度上都呈正相关,即暖湿/冷干配置,但在130a尺度上是负相关,即冷湿/暖干配置。20世纪以来的快速增暖增湿发生在260a尺度上。线性增暖趋势和千年尺度分量都是暖湿/冷干配置并占有较大的方差,它们在很大程度上左右着百年尺度上的温湿配置。二者的结合直接导致千年尺度上温湿配置在8世纪出现由冷湿/暖干向暖湿/冷干气候型的转变。Abstract： The multi-scale characteristics of the reconstructed temperature and glacier ice accumulation from Guliya ice core on the Tibetan Plateau are studied by orthogonal wavelet decomposition. The main characteristics of the two sequences can be almost totally reproduced by the components with the scales longer than 100 years,and the wellknown climate events in the records can be fitted well by only one or several decomposed components. In addition,the records also show some unsteady properties of their components, by which a number of transient climate events can be interpreted well. Meanwhile the unsteadiness also exists in their collocation evolution although their correiation coefficients are almost positive except for the one at scale 130 years. Besides,the linear trend of temperature and millennia-scale components of the two sequences dominated their collocation evolution during 301-1990AD.

关 键 词：古里雅冰芯 正交小波分解 温度和冰川积累量 配置 多时间尺度 非平稳性 

分 类 号：P532[天文地球—古生物学与地层学]