Evidence of late Holocene climate variability in the western Nanling Mountains, South China

摘要

A 95-cm-thick peat sequence obtained from Daping Swamp in the western Nanling Mountains provides evidence for climate variability in the past ~3,000 year. Multi-proxy records (including organic carbon isotopes, humification degree, organic matter content, and dry bulk density) revealed three intensified Asian summer monsoon (ASM) intervals (i.e.~2900– 2700, 2500–1700 and 1000–600 cal. yr BP) and three weakenedASMintervals (i.e.~2800–2500, 1700–1000 and 600–200 cal. yr BP). Our δ~(13)C record shows a possible correlation with the sunspot number and residual atmospheric ~(14)C records on multi-centennial scale, especially for the period between 2960 and 2200 cal. yr BP. A spectral analysis of δ~(13)C record reveals three significant cycles (i.e., 396, 110 and 102 yr) and all these cycles could be related to solar activity, suggesting that solar outputmay have influenced the late Holocene climate variability in the study region.