气候变化领域集成服务门户(CCPortal): Cryogenic cave carbonates in the dolomites (northern Italy): Insights into Younger Dryas cooling and seasonal precipitation

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DOI	10.5194/cp-17-775-2021
	Cryogenic cave carbonates in the dolomites (northern Italy): Insights into Younger Dryas cooling and seasonal precipitation
	Koltai G.; Spötl C.; Jarosch A.H.; Cheng H.
发表日期	2021
ISSN	1814-9324
起始页码	679
结束页码	697
卷号	17 期号:2
英文摘要	In the European Alps, the Younger Dryas (YD) was characterised by the last major glacier advance, with equilibrium line altitudes being ~220 to 290m lower than during the Little Ice Age, and also by the development of rock glaciers. Dating of these geomorphic features, however, is associated with substantial uncertainties, leading to considerable ambiguities regarding the internal structure of this stadial, which is the most intensively studied one of the last glacial period. Here, we provide robust physical evidence based on 230Th-dated cryogenic cave carbonates (CCCs) from a cave located at 2274ma.s.l. in the Dolomites of northern Italy coupled with thermal modelling, indicating that early YD winters were only moderately cold in this part of the Alps. More precisely, we find that the mean annual air temperature dropped ≤ 3 °C at the Allerød-YD transition. Our data suggest that autumns and early winters in the early part of the YD were relatively snow-rich, resulting in stable winter snow cover. The latter insulated the shallow subsurface in winter and allowed the cave interior to remain close to the freezing point (0 °C) year-round, promoting CCC formation. The main phase of CCC precipitation at ~12.2 ka coincided with the mid-YD transition recorded in other archives across Europe. Based on thermal modelling we propose that CCC formation at ~12.2 ka was most likely associated with a slight warming of approximatelyC1 °C in conjunction with drier autumns and early winters in the second half of the YD. These changes triggered CCC formation in this Alpine cave as well as ice glacier retreat and rock glacier expansion across the Alps. © Author(s) 2021.
来源期刊	Climate of the Past
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/183588
作者单位	Institute of Geology, University of Innsbruck, Innrain 52d, Innsbruck, 6020, Austria; ThetaFrame Solutions, Hörfarterstrasse 14, Kufstein, 6330, Austria; Institute of Global Environmental Change, Xi'An Jiaotong University, Xi'an, China; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, China; Department of Earth Sciences, University of Minnesota, Minneapolis, MN, United States
推荐引用方式 GB/T 7714	Koltai G.,Spötl C.,Jarosch A.H.,et al. Cryogenic cave carbonates in the dolomites (northern Italy): Insights into Younger Dryas cooling and seasonal precipitation[J],2021,17(2).
APA	Koltai G.,Spötl C.,Jarosch A.H.,&Cheng H..(2021).Cryogenic cave carbonates in the dolomites (northern Italy): Insights into Younger Dryas cooling and seasonal precipitation.Climate of the Past,17(2).
MLA	Koltai G.,et al."Cryogenic cave carbonates in the dolomites (northern Italy): Insights into Younger Dryas cooling and seasonal precipitation".Climate of the Past 17.2(2021).