Proxy data reconstructions of the Storglaciaren (Sweden) mass-balance record back to AD 1500 on annual to decadal timescales

被引:7
作者
Linderholm, Hans W. [1 ]
Jansson, Peter [1 ]
机构
[1] Univ Gothenburg, Dept Earth Sci, Reg Climate Grp, SE-40530 Gothenburg, Sweden
来源
ANNALS OF GLACIOLOGY, VOL 46, 2007 | 2007年 / 46卷
基金
瑞典研究理事会;
关键词
D O I
10.3189/172756407782871404
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Regional summer temperatures (T-S), derived from tree rings, and large-scale atmospheric circulation indices (North Atlantic Oscillation (NAO)) were used to infer the mass balance of Storglaciaren, Sweden, on annual and decadal timescales back to AD 1500. Winter (January-March) NAO was not a suitable proxy for interannual winter balance variability, but seemed to have substantial influence on decadal timescales. T-S were highly correlated to the summer balance, but also to the annual net balance. This association was much weaker on decadal timescales, mainly because of the increased maritime climate around 1980. Storglaciaren net balance was modelled back to AD 1500 with annual resolution (using T-S as a predictor), and AD 1664 with decadal resolution (using T-S and NAO as predictors). Both reconstructions displayed similar evolution. Negative mass balances dominated most of the 16th century, followed by a longer period of predominantly positive mass-balance years culminating in about 1750. This is in agreement with previous suggestions of Holocene maximum expansion of Storglaciaren at that time. Subsequently, the mass balance is highly variable, with an increased number of negative years. The build-up to the well-documented early-20th-century advance is evident as mass balance becomes progressively more positive towards the early 20th century.
引用
收藏
页码:261 / +
页数:2
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