Decadal-scale variability of warm season temperature in Beijing over the past 2650 years |
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Authors: | Ying Dai Yan Zhang JunYi Ge |
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Institution: | 1 Key Laboratory of Cenozoic Geology and Environment,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;2Graduate University of Chinese Academy of Sciences,Beijing 100049,China |
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Abstract: | A continuous record of surface temperature for the past 2650 years was obtained in an earlier study from a Beijing stalagmite
based on sedimentary layer counting and thickness measurements. Singular spectrum analysis, multi-taper and wavelet spectral
analyses are used in this study to identify decadal-scale signals and their origins in this record. Besides long-term cycles
of solar origin identified in earlier studies, this record contains cycles that dominate temperature with periods of 102–70,
66–50, 31, 25–22, 19, 15, 12 and 9 years. The 102–70, 25–22, 12 and 9 year cycles are attributable to solar variation, while
the others are likely to be related to low-latitude ocean forcing. These results suggest that century-scale changes in the
Beijing summer temperature over the past 2650 years are primarily controlled by solar variation, while ocean-atmospheric interactions
play a prominent role in modulating decadal-scale variability. |
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Keywords: | stalagmite singular spectrum analysis (SSA) decadal climate cycles warm season temperature |
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