Improved age modelling approaches as exemplified by the revised chronology for the Central European varved lake Soppensee

被引:68
作者
Blockley, S. P. E. [1 ]
Ramsey, C. Bronk [1 ]
Lane, C. S. [1 ]
Lotter, A. F. [2 ]
机构
[1] Univ Oxford, Res Lab Archaeol, Oxford OX1 3QY, England
[2] Univ Utrecht, Palaeobot & Palynol Lab, Inst Environm Biol, Utrecht, Netherlands
基金
英国自然环境研究理事会;
关键词
D O I
10.1016/j.quascirev.2007.01.018
中图分类号
P9 [自然地理学];
学科分类号
0705 ; 070501 ;
摘要
One of the key factors in understanding past climate change is the development of robust age models that have sufficient chronological precision for comparing different palaeoclimate archives, while retaining accuracy. Recent developments in Bayesian age modelling are applied here to the Swiss varve lake, Soppensee. We develop revised age models for this sequence using the available stratigraphic information to constrain the calibrated radiocarbon ages. We begin by using stratigraphical order as the only constraint and then sequentially increase the information incorporated into the model, using relative varve age, sample depth, and varying depositional models. Within this Bayesian framework, we develop internally robust models that significantly improve the dating precision and are applicable to both varved and non-varved sequences. We then compare the model output to wider chronological information, such as the age of the Laacher See Tephra in order to test the model accuracy. The results of this exercise suggest that these methods can be used to build very reliable improved age models in a variety of records. (C) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码:61 / 71
页数:11
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