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DOI	10.1016/j.accre.2015.11.001
	How similar are annual and summer temperature variability in central Sweden?
	Zhang P.; Chen D.; Linderholm H.W.; Zhang Q.
发表日期	2015
ISSN	1674-9394
卷号	6 期号:2019-03-04
英文摘要	Tree-ring based temperature reconstructions have successfully inferred the past inter-annual to millennium scales summer temperature variability. A clear relationship between annual and summer temperatures can provide insights into the variability of past annual mean temperature from the reconstructed summer temperature. However, how similar are summer and annual temperatures is to a large extent still unknown. This study aims at investigating the relationship between annual and summer temperatures at different timescales in central Sweden during the last millennium. The temperature variability in central Sweden can represent large parts of Scandinavia which has been a key region for dendroclimatological research. The observed annual and summer temperatures during 1901-2005 were firstly decomposed into different frequency bands using ensemble empirical mode decomposition (EEMD) method, and then the scale-dependent relationship was quantified using Pearson correlation coefficients. The relationship between the observed annual and summer temperatures determined by the instrumental data was subsequently used to evaluate 7 climate models. The model with the best performance was used to infer the relationship for the last millennium. The results show that the relationship between the observed annual and summer temperatures becomes stronger as the timescale increases, except for the 4-16 years timescales at which it does not show any relationship. The summer temperature variability at short timescales (2-4 years) shows much higher variance than the annual variability, while the annual temperature variability at long timescales (>32 years) has a much higher variance than the summer one. During the last millennium, the simulated summer temperature also shows higher variance at the short timescales (2-4 years) and lower variance at the long timescales (>1024 years) than those of the annual temperature. The relationship between the two temperatures is generally close at the long timescales, and weak at the short timescales. Overall the summer temperature variability cannot well reflect the annual mean temperature variability for the study region during both the 20th century and the last millennium. Furthermore, all the climate models examined overestimate the annual mean temperature variance at the 2-4 years timescales, which indicates that the overestimate could be one of reasons why the volcanic eruption induced cooling is larger in climate models than in proxy data. © 2015 National Climate Center (China Meteorological Administration).
英文关键词	Annual temperature; Central Sweden; Climate model simulation; Scale-dependent similarity; Summer temperature
语种	英语
来源期刊	Advances in Climate Change Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/89248
作者单位	Regional Climate Group, Department of Earth Sciences, University of Gothenburg, Gothenburg, 40530, Sweden; Bert Bolin Centre for Climate Research, Department of Physical Geography and Quaternary Geology, Stockholm University, Stockholm, 10691, Sweden
推荐引用方式 GB/T 7714	Zhang P.,Chen D.,Linderholm H.W.,et al. How similar are annual and summer temperature variability in central Sweden?[J],2015,6(2019-03-04).
APA	Zhang P.,Chen D.,Linderholm H.W.,&Zhang Q..(2015).How similar are annual and summer temperature variability in central Sweden?.Advances in Climate Change Research,6(2019-03-04).
MLA	Zhang P.,et al."How similar are annual and summer temperature variability in central Sweden?".Advances in Climate Change Research 6.2019-03-04(2015).