干旱区生态环境知识资源中心(Arid): Glacier extent and climate in the Maritime Alps during the Younger Dryas

Arid

DOI	10.1016/j.palaeo.2019.109400
	Glacier extent and climate in the Maritime Alps during the Younger Dryas
	Spagnolo, Matteo 1; Ribolini, Adriano 2
通讯作者	Spagnolo, Matteo
来源期刊	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN	0031-0182
EISSN	1872-616X
出版年	2019
卷号	536
英文摘要	This study focuses on an Egesen-stadial moraine located at 1906-1920 m asl in the NE Maritime Alps, Europe. Three moraine boulders are dated, via cosmogenic isotope analyses, to 12,490 +/- 1120, 12,260 +/- 1220 and 13,840 +/- 1240 yr, an age compatible with the Younger Dryas cooling event. The reconstructed glacier that deposited the moraine has an equilibrium line altitude of 2349 +/- 5 m asl, calculated with an Accumulation Area Balance Ratio of 1.6. The result is very similar to the equilibrium line altitude of another reconstructed glacier that deposited a moraine also dated to Younger Dryas, in the SW Maritime Alps. The similarity suggests comparable climatic conditions across the region during the cooling event. The Younger Dryas palaeoprecipitation is 1549 +/- 26 mm/yr, calculated using the empirical law that links precipitation and temperature at a glacier equilibrium line altitude, with palaeotemperatures obtained from nearby palynological and chironomids studies. The palaeoprecipitation is similar to the present, thus indicating non-arid conditions during the Younger Dryas. This is probably due to the Maritime Alps peculiar position, at the crossroads between air masses from the Mediterranean and the North Atlantic, the latter displaced by the southward migration of the polar front. The equilibrium line altitude interval defined by the two reconstructed glaciers, is used to model the extent of another 66 potential Younger Dryas glaciers in the region. Each modelled glacier is reconstructed by iteratively changing the position of its front until the reconstructed glacier has an ELA that falls within the interval. The result, which is checked against geomorphological evidence, shows that glaciers covered 83.74 km(2) during the Younger Dryas, with a volume of 5.39 km(3). All valley heads were occupied by ice, except for the Maddalena/Larche Pass (1999 m asl), an ideal site for future archaeological, palaeoecological and palaeozoological studies.
英文关键词	Younger Dryas Glacier reconstruction Equilibrium Line Altitude Palaeoclimate Cosmogenic dates Maritime Alps
类型	Article
语种	英语
国家	Scotland ; Italy
开放获取类型	Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000501656600003
WOS关键词	EQUILIBRIUM-LINE ALTITUDES ; EGESEN MORAINE ; MASS-BALANCE ; VALLEY GLACIERS ; EUROPEAN ALPS ; EXPOSURE AGE ; WESTERN ALPS ; SWISS-ALPS ; SURFACE ; RECONSTRUCTION
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS研究方向	Physical Geography ; Geology ; Paleontology
EI主题词	2019-12-15
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/311774
作者单位	1.Univ Aberdeen, Sch Geosci, Aberdeen, Scotland; 2.Univ Pisa, Dipartimento Sci Terra, Pisa, Italy
推荐引用方式 GB/T 7714	Spagnolo, Matteo,Ribolini, Adriano. Glacier extent and climate in the Maritime Alps during the Younger Dryas[J],2019,536.
APA	Spagnolo, Matteo,&Ribolini, Adriano.(2019).Glacier extent and climate in the Maritime Alps during the Younger Dryas.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,536.
MLA	Spagnolo, Matteo,et al."Glacier extent and climate in the Maritime Alps during the Younger Dryas".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 536(2019).