Different facets of dry-wet patterns in south-western China over the past 27 000 years

	Different facets of dry-wet patterns in south-western China over the past 27 000 years
	Liao, Mengna; Li, Kai; Sun, Weiwei; Ni, Jian
刊名	CLIMATE OF THE PAST
	2021
卷号	17 期号:5 页码:2291-2303
英文摘要	Frequently occurring mega-droughts under current global climate change have attracted broad social attention. A paleoclimatic perspective is needed to increase our understanding of the causes and effects of droughts. South-western (SW) China has been threatened by severe seasonal droughts. Our current knowledge of millennial-scale dry and wet phases in this region is primarily based on the variability of the Indian summer monsoon. However, water availability over land does not always follow patterns of monsoonal precipitation but also depends on water loss from evaporation and transpiration. Here, we reconstructed precipitation intensity, lake hydrological balance and the soil water stress index (SWSI) for the last 27 000 years. Grain size, geochemical and pollen records from Yilong Lake reveal the long-term relationships and inconsistencies of dry-wet patterns in meteorological, hydrological and soil systems in the central Yunnan region, SW China. Our results show that the long-term trends among precipitation, hydrological balance and soil moisture varied through time. The hydrological balance and soil moisture were primarily controlled by temperature-induced evaporation change during periods of low precipitation such as the Last Glacial Maximum and Younger Dryas. During periods of high precipitation (the early to late Holocene), intensified evaporation from the lake surface offset the effects of increased precipitation on the hydrological balance. However, abundant rainfall and the dense vegetation canopy circumvented a soil moisture deficit that might have resulted from rising temperature. In conclusion, the hydrological balance in the central Yunnan region was more sensitive to temperature change while soil moisture could be further regulated by vegetation changes over millennial timescales. Therefore, under future climate warming, the surface water shortage in the central Yunnan region may become even more serious. Our study suggests that reforestation efforts may provide some relief to soil moisture deficits in this region.
内容类型	期刊论文
源URL	[http://159.226.73.51/handle/332005/20361]
专题	中国科学院南京地理与湖泊研究所
推荐引用方式 GB/T 7714	Liao, Mengna,Li, Kai,Sun, Weiwei,et al. Different facets of dry-wet patterns in south-western China over the past 27 000 years[J]. CLIMATE OF THE PAST,2021,17(5):2291-2303.
APA	Liao, Mengna,Li, Kai,Sun, Weiwei,&Ni, Jian.(2021).Different facets of dry-wet patterns in south-western China over the past 27 000 years.CLIMATE OF THE PAST,17(5),2291-2303.
MLA	Liao, Mengna,et al."Different facets of dry-wet patterns in south-western China over the past 27 000 years".CLIMATE OF THE PAST 17.5(2021):2291-2303.