Holocene moisture variations across China and driving mechanisms: A聽synthesis of climatic records

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• 作者：Min Ran ; Zhaodong Feng
• 刊名：Quaternary International
• 出版年：5 November, 2013
• 年：2013
• 卷：313-314
• 期：Complete
• 页码：179-193
• 全文大小：2793 K

文摘

Based on the review of 33 Holocene moisture reconstructions that passed quality scrutiny, temporal and spatial patterns of regional moisture variations are delineated. The regionally-averaged moisture index from Xinjiang demonstrates that the moisture index has been persistently climbing since 鈭?0聽ka cal BP and that the period between 鈭? and 鈭?聽ka cal BP is the Holocene Moisture Optimum. Comparison of the moisture index of Xinjiang region with the winter climate of northern Europe leads us to propose that the Holocene moisture variations in Xinjiang region have been controlled by the winter temperature variations in the North Atlantic region. The regionally-averaged moisture index from the Tibetan Plateau shows that the moisture has been persistently declining since 鈭?1聽ka cal BP and that the period between 鈭?1.5 and 7.5聽ka cal BP was the Holocene Moisture Optimum. The parallel trends between the moisture level in the Tibetan Plateau and the Indian summer monsoon strength retrieved from the Arabian Sea suggest that the Tibetan Plateau has been under influence of the Indian summer monsoon throughout the Holocene. The regionally-averaged moisture index curves from Northern China and Southern China are the delayed reflections of the East Asian summer monsoon strength to the solar radiation. That is, the peak insolation was responded by the Holocene 鈥淥ceanic Thermal Optimum鈥?with significant time lags and the 鈥淥ceanic Thermal Optimum鈥?was then responded by the 鈥淗olocene Moisture Optimum鈥?in southern China and northern China also with some time lags. The differences in the moisture-index curve shapes and in the durations of the 鈥淗olocene Moisture Optimum鈥?between northern China and southern China suggest that the strength of the East Asian summer monsoon had gradually transgressed northward in the early Holocene and gradually regressed southward in the late Holocene.