中国中世纪气候异常期温度的多尺度变化特征及区域差异

doi:10.11821/dlxb201907001

Abstract

Abstract:

Medieval Climate Anomaly (MCA, 950-1250 A.D.) was the most recent and lasting hundreds of years warm period, which has aroused more attention from climate scholars, because MCA provided similar patterns to research on the impact and adaption of global and regional warming. In this study, we investigate the characteristics of temperature variation on inter-decadal to centennial scale during MCA in four regions (including Northeast, Northwest, Central-east and Tibetan Plateau) in China based on high-resolution temperature reconstructions longer than 1000 years and related warm-cold records from historical documents. Ensemble empirical mode decomposition method is used to analyze the cycles and fluctuations of four regional temperature series. The results show that the longest warm period during the last 2000 years occurred in the 10th-13th centuries over the whole country, although there existed several cold decadal intervals in the mid to late 12th century, different starting-ending warming periods and warming magnitudes in four regions. On quasi-30-year scale, regional temperature variations were similar during 950-1130 A.D. while their amplitudes became smaller and the phases did not match well each other in 1130-1250 A.D. On centennial scale, all the four regions began a warm period in the early 10th century and experienced two cold intervals during MCA. However, temperature variations of Northwest and Central-east kept in phase each other, but out phase in Northeast and Tibetan Plateau, where the ending of the warm period was earlier about 40-50 years than that of Northwest and Central-east. On multi-centennial scale, the mean temperature difference between MCA and Little Ice Age in Northeast and Central-east is significant, but did not appear in Northwest and Tibetan Plateau. Compared with the mean temperature of the 20th century, Central-east had a comparable warming level, Northeast was a little cooler, and both Northwest and Tibetan Plateau had significantly lower temperatures in MCA.

Key words: Medieval Climate Anomaly, temperature, mlulti-scale, regional differences, China

ZHENG Jingyun,LIU Yang,WU Maowei,ZHANG Xuezhen,HAO Zhixin. Evidences and regional differences on multi-scales in Medieval Climate Anomaly over China[J].Acta Geographica Sinica, 2019, 74(7): 1281-1291.

Figures/Tables 4

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References 43

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地区/点	代用证据	区域范围或样点经纬度及海拔	重建指标	重建时段	时间分辨率	文献编号
东北部	泥炭δ¹⁸O、湖泊纹层长链烯酮(long-chain alkenone)、石笋微层厚度、历史冷暖记载;5条序列集成	约110°E~130°E、36oN~50°N	年平均温度	1-2000 AD	10年	[17]
西北部	树轮宽度;祁连山北坡2条序列合成	约80°E~110oE、38oN以北至国境	年平均温度	850-2000 AD	10年	[17]
东中部	历史冷暖记载;3条(1380年后)和8条(1470年后)序列集成	约105°E~122oE、24oN~36oN	年平均温度	1-2000 AD	10年	[17]
青藏高原	冰芯δ¹⁸O,树轮宽度,湖泊沉积物有机碳(Total Organic Carbon)、长链烯酮;8条序列集成	约80°E~102oE、25oN~38oN	年平均温度	1-2000 AD	10年	[17]
青藏高原东部	树轮宽度;12个年表集成	87°E~102oE、27oN~38oN, 海拔3100~4500 m	6-8月平均气温	1000-2005 AD	1年	[18]

本征模函数(IMFs)	东北(%)	西北(%)	东中(%)	青藏高原(%)	青藏高原东部(%)
IMF1	29.5	24.5	11.3	31.5	42.7
IMF2+IMF3	29.1	28.6	40.7	25.9	38.0
IMF ≥ 4	21.9	46.7	29.7	34.3	18.7

Evidences and regional differences on multi-scales in Medieval Climate Anomaly over China

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