Journal of Geographical Sciences ›› 2020, Vol. 30 ›› Issue (1): 119-130.doi: 10.1007/s11442-020-1718-7

• Special Issue: Global and Regional Land Surface Characteristics and Socio-economic Scenarios • Previous Articles     Next Articles

Multi-scale temperature variations and their regional differences in China during the Medieval Climate Anomaly

HAO Zhixin1,2, WU Maowei1, LIU Yang1,2, ZHANG Xuezhen1,2, ZHENG Jingyun1,2,*()   

  1. 1. Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2019-07-08 Accepted:2019-08-16 Online:2020-01-25 Published:2020-03-25
  • Contact: ZHENG Jingyun E-mail:zhengjy@igsnrr.ac.cn
  • About author:Hao Zhixin, Professor, specialized in climate change. E-mail: haozx@igsnrr.ac.cn
  • Supported by:
    National Key R&D Program of China, No(2017YFA0603300);National Natural Science Foundation of China, No(41671036);National Natural Science Foundation of China, No(41831174);The Strategic Priority Research Program of the Chinese Academy of Sciences, No(XDA19040101)

Abstract:

The Medieval Climate Anomaly (MCA, AD950-1250) is the most recent warm period lasting for several hundred years and is regarded as a reference scenario when studying the impact of and adaptation to global and regional warming. In this study, we investigated the characteristics of temperature variations on decadal-centennial scales during the MCA for four regions (Northeast, Northwest, Central-east, and Tibetan Plateau) in China, based on high-resolution temperature reconstructions and related warm-cold records from historical documents. The ensemble empirical mode decomposition method is used to analyze the time series. The results showed that for China as a whole, the longest warm period during the last 2000 years occurred in the 10th-13th centuries, although there were multi-decadal cold intervals in the middle to late 12th century. However, in the beginning and ending decades, warm peaks and phases on the decadal scale of the MCA for different regions were not consistent with each other. On the inter-decadal scale, regional temperature variations were similar from 950 to 1130; moreover, their amplitudes became smaller, and the phases did not agree well from 1130 to 1250. On the multi-decadal to centennial scale, all four regions began to warm in the early 10th century and experienced two cold intervals during the MCA. However, the Northwest and Central-east China were in step with each other while the warm periods in the Northeast China and Tibetan Plateau ended about 40-50 years earlier. On the multi-centennial scale, the mean temperature difference between the MCA and Little Ice Age was significant in Northeast and Central-east China but not in the Northwest China and Tibetan Plateau. Compared to the mean temperature of the 20th century, a comparable warmth in the MCA was found in the Central-east China, but there was a little cooling in Northeast China; meanwhile, there were significantly lower temperatures in Northwest China and Tibetan Plateau.

Key words: China, multi-scale variations, temperature, Medieval Climate Anomaly