Abstract
The temperature variability over multidecadal and longer timescales (e.g., the cold epochs in the late 15th, 17th, and early 19th centuries) is significant and dominant in the millennium-long, large-scale reconstructions and model simulations; however, their temporal patterns in the reconstructed and simulated temperature series are not well understood and require a detailed assessment and comparison. Here, we compare the reconstructed and simulated temperature series for the Northern Hemisphere (NH) at multidecadal and longer-term timescales (>30 years) by evaluating their covariance, climate sensitivity and amplitude of temperature changes. We found that covariances between different reconstructions or between reconstructions and simulations are generally high for the whole period of 850–1999 CE, due to their similar long-term temporal patterns. However, covariances between different reconstructions or between reconstructions and simulations steadily decline as time series extends further back in time, becoming particularly small during Medieval times. This is related to the large uncetainties in the reconstructions caused by the decreased number of proxy records and sample duplication during the pre-instrumental periods. Reconstructions based solely on tree-ring data show higher skill than multiproxy reconstructions in capturing the amplitude of volcanic cooling simulated by models. Meanwhile, climate models have a shorter recovery (i.e., lag) in response to the cooling caused by volcanic eruptions and solar activity minima, implying the lack of some important feedback mechanisms between external forcing and internal climate processes in climate models. Amplitudes of temperature variations in the latest published tree-ring reconstructions are comparable to those of the multiproxy reconstructions. We found that the temperature difference between the Medieval Climate Anomaly (950–1250 CE) and the Little Ice Age (1450–1850 CE) is generally larger in proxy-based reconstructions than in model simulations, but the reason is unclear.
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Acknowledgements
Jingyun ZHENG, Xuezhen ZHANG, Jianglin WANG, and Miao FANG are supported by the National Key R&D Program of China (Grant No. 2017YFA0603302). Bao YANG, Jianglin WANG, and Jingjing LIU are supported by the National Natural Science Foundation of China (Grant Nos. 41888101 & 41602192 & 41977383), the Belmont Forum and JPI-Climate, Collaborative Research Action “INTEGRATE” (Grant No. 41661144008). Jianglin WANG also acknowledges the support by the Youth Innovation Promotion Association Foundation of the Chinese Academy of Sciences (Grant No. 2018471). Zhiyuan WANG is supported by the National Natural Science Foundation (Grant No. 41901095). Feng SHI is supported by the National Natural Science Foundation (Grant No. 41877440). Jingjing LIU is supported by Opening Fund of Key Laboratory of Desert and Desertification, Chinese Academy of Sciences (Grant No. KLDD-2019-04).
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Wang, J., Yang, B., Zheng, J. et al. Evaluation of multidecadal and longer-term temperature changes since 850 CE based on Northern Hemisphere proxy-based reconstructions and model simulations. Sci. China Earth Sci. 63, 1126–1143 (2020). https://doi.org/10.1007/s11430-019-9607-x
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DOI: https://doi.org/10.1007/s11430-019-9607-x