气候变化领域集成服务门户(CCPortal): Elevated Southern Hemisphere moisture availability during glacial periods

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DOI	10.1038/s41586-023-06989-3
	Elevated Southern Hemisphere moisture availability during glacial periods
	Weij, Rieneke; Sniderman, J. M. Kale; Woodhead, Jon D.; Hellstrom, John C.; Brown, Josephine R.; Drysdale, Russell N.; Reed, Elizabeth; Bourne, Steven; Gordon, Jay
发表日期	2024
ISSN	0028-0836
EISSN	1476-4687
起始页码	626
结束页码	7998
卷号	626 期号:7998
英文摘要	Late Pleistocene ice-age climates are routinely characterized as having imposed moisture stress on low- to mid-latitude ecosystems1-5. This idea is largely based on fossil pollen evidence for widespread, low-biomass glacial vegetation, interpreted as indicating climatic dryness6. However, woody plant growth is inhibited under low atmospheric CO2 (refs. 7,8), so understanding glacial environments requires the development of new palaeoclimate indicators that are independent of vegetation9. Here we show that, contrary to expectations, during the past 350 kyr, peaks in southern Australian climatic moisture availability were largely confined to glacial periods, including the Last Glacial Maximum, whereas warm interglacials were relatively dry. By measuring the timing of speleothem growth in the Southern Hemisphere subtropics, which today has a predominantly negative annual moisture balance, we developed a record of climatic moisture availability that is independent of vegetation and extends through multiple glacial-interglacial cycles. Our results demonstrate that a cool-moist response is consistent across the austral subtropics and, in part, may result from reduced evaporation under cool glacial temperatures. Insofar as cold glacial environments in the Southern Hemisphere subtropics have been portrayed as uniformly arid3,10,11, our findings suggest that their characterization as evolutionary or physiological obstacles to movement and expansion of animal, plant and, potentially, human populations10 should be reconsidered. Contrary to expectations from pollen and dust records, Southern Hemisphere subtropical regions experienced the greatest climatic moisture during glacial periods of the Late Pleistocene, which may not have been an obstacle to movement and expansion of animals and plants.
语种	英语
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:001159144100013
来源期刊	NATURE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/298238
作者单位	University of Melbourne; Centre National de la Recherche Scientifique (CNRS); University of Adelaide; South Australian Museum; University of Cape Town; University of Cape Town
推荐引用方式 GB/T 7714	Weij, Rieneke,Sniderman, J. M. Kale,Woodhead, Jon D.,et al. Elevated Southern Hemisphere moisture availability during glacial periods[J],2024,626(7998).
APA	Weij, Rieneke.,Sniderman, J. M. Kale.,Woodhead, Jon D..,Hellstrom, John C..,Brown, Josephine R..,...&Gordon, Jay.(2024).Elevated Southern Hemisphere moisture availability during glacial periods.NATURE,626(7998).
MLA	Weij, Rieneke,et al."Elevated Southern Hemisphere moisture availability during glacial periods".NATURE 626.7998(2024).