Annually Laminated Lake Sediments and Their Palaeoclimatic Relevance
Annually Laminated Lake Sediments and Their Palaeoclimatic Relevance
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DOI：
10.1007/978-3-662-10313-5_7
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
A. Brauer
中科院分区：
文献类型：
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作者：
A. Brauer
本综述旨在概述每年层状（变化的）湖泊沉积物，并提供其作为古气候代理数据档案的使用指南。对大约一百年的水藻研究的简要调查表明，基于水藻湖沉积物进行测年和古环境重建的悠久历史。考虑到方法论，本综述仅限于 varve 研究的一些主要原则和基本要求。深入讨论了湖泊系统中有利于水藻沉积和保存的因素以及长水藻剖面出现的后果。 varve微相的概念描述了主要的varve类型及其与气候状况和环境条件的关系。 varved 湖沉积物的古气候相关性反映在大量不同的代理数据中。这些都是在更一般的方面进行讨论的，包括气候信号进入沉积物的路径，特别强调对水藻厚度的解释。两个案例研究证明了 Varve 微相分析对于获得过去气候季节性变化的复杂图像的价值。
This review aims to give an overview on annually laminated (varved) lake sediments and provides a guideline of their use as palaeoclimatic proxy data archives. A brief survey of about one hundred years of varve research demonstrates the long history of dating and palaeoenvironmental reconstruction based on varved lake sediments. Considering methodologies, this review confines to some main principles and fundamental requirements for varve studies. The factors favouring varve deposition and preservation in lacustrine systems and consequences for the occurrence of long varved profiles are thoroughly discussed. The concept of varve microfacies describes the main varve types and their relation to climatic regimes and environmental conditions. The palaeoclimatic relevance of varved lake sediments is reflected in a large variety of different proxy data. These are discussed under a more general aspect including the pathways of climatic signals into the sediment with special emphasis on the interpretation of varve thickness. Two case studies demonstrate the value of varve micro-facies analyses for obtaining a complex picture of changes in seasonality of past climates.