DOI: 10.5194/tc-7-1073-2013
Scopus记录号: 2-s2.0-84880539487
论文题名: Alpine permafrost thawing during the Medieval Warm Period identified from cryogenic cave carbonates
作者: Luetscher M ; , Borreguero M ; , Moseley G ; E ; , Spötl C ; , Edwards R ; L
刊名: Cryosphere
ISSN: 19940416
出版年: 2013
卷: 7, 期: 4 起始页码: 1073
结束页码: 1081
语种: 英语
英文关键词: alpine environment
; carbonate
; cave deposit
; cavitation
; Last Glacial
; paleoenvironment
; permafrost
; precipitation (chemistry)
; thawing
; Alps
; Europe
英文摘要: Coarse crystalline cryogenic cave carbonates (CCCcoarse) dated to the last glacial period are common in central European caves and provide convincing evidence of palaeo-permafrost during this time. Little is known, however, about the exact nature of the environment in which CCCcoarse formed as no modern analogue setting is known. Here, we report the first findings of sub-recent, albeit inactive, CCCcoarse from a cave of the Western Alps which is located in the present-day permafrost zone. The globular shape and the presence of ubiquitous euhedral crystal terminations are comparable to previously reported aggregates from the last glacial period and strongly suggest that these aggregates formed subaqueously in pools lacking agitation. Furthermore, stable isotope values of mm-sized spheroids point to calcite precipitation in a closed system with respect to CO2, strongly supporting the hypothesis of a cryogenic origin associated with the freezing of water ponds. U-series analyses revealed three clusters of late Holocene calcite precipitation intervals between 2129 and 751 a b2k. These ages correlate with known periods of elevated summer temperatures, suggesting that warming and thawing of the frozen catchment above the cave allowed water infiltration into the karst system. The growth of CCCcoarse resulted from the re-freezing of this water in the still cold karst cavities. © Author(s) 2013. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/74978
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Institute of Geology, University of Innsbruck, Innsbruck, Austria; Corcelles, Switzerland; Department of Geology and Geophysics, University of Minnesota, MN, United States
Recommended Citation:
Luetscher M,, Borreguero M,, Moseley G,et al. Alpine permafrost thawing during the Medieval Warm Period identified from cryogenic cave carbonates[J]. Cryosphere,2013-01-01,7(4)