近2ka古里雅冰芯記錄的溫濕配置多尺度特征

氣候變化研究進(jìn)展 ?? 2007, Vol. 03 ?? Issue (03): 167-171.

近2ka古里雅冰芯記錄的溫濕配置多尺度特征

戴新剛尤莉汪萍封國林

中科院大氣物理研究所

收稿日期:2006-08-28 修回日期:2007-01-05 出版日期:2007-05-30 發(fā)布日期:2007-05-30
通訊作者: 戴新剛

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

Received:2006-08-28 Revised:2007-01-05 Online:2007-05-30 Published:2007-05-30

摘要/Abstract

摘要： 采用正交小波分解研究了近2 ka來青藏高原古里雅冰芯記錄的氣溫和冰川積累量演變多尺度特征，得到了與構(gòu)成序列中主要?dú)夂蚴录?duì)應(yīng)的尺度分量。用130 a尺度以上分量幾乎可以重建冰芯記錄中的主要冷暖或干濕氣候事件。平均而言，溫度和冰川積累量配置在大多數(shù)時(shí)間尺度上都呈正相關(guān)，即暖濕/冷干配置，但在130 a尺度上是負(fù)相關(guān)，即冷濕/暖干配置。20世紀(jì)以來的快速增暖增濕發(fā)生在260 a尺度上。線性增暖趨勢(shì)和千年尺度分量都是暖濕/冷干配置并占有較大的方差，它們?cè)诤艽蟪潭壬献笥抑倌瓿叨壬系臏貪衽渲谩６叩慕Y(jié)合直接導(dǎo)致千年尺度上溫濕配置在8世紀(jì)出現(xiàn)由冷濕/暖干向暖濕/冷干氣候型的轉(zhuǎn)變。

關(guān)鍵詞: 古里雅冰芯, 正交小波分解, 溫度和冰川積累量, 配置, 非平穩(wěn)性

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 well-known 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 correlation 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 301-1990 AD.

Key words: Guliya ice core, orthogonal wavelets, temperature and ice accumulation, collocation, multi-scale characteristics, unsteadiness

戴新剛尤莉汪萍封國林. 近2ka古里雅冰芯記錄的溫濕配置多尺度特征[J]. 氣候變化研究進(jìn)展, 2007, 03(03): 167-171.

. Multi-Scale Characteristics and Unsteadiness of Reconstructed Temperature and Ice Accumulation Records in Guliya Ice Core[J]. Climate Change Research, 2007, 03(03): 167-171.

国产综合在线观看视频,国产精品原创视频,亚洲国产熟亚洲女视频,一级风流片a级国产