globalchange  > 气候变化与战略
DOI: 10.5194/cp-8-519-2012
Scopus记录号: 2-s2.0-84858789449
论文题名:
Precipitation as the main driver of Neoglacial fluctuations of Gualas glacier, Northern Patagonian Icefield
作者: Bertrand S.; Hughen K.A.; Lamy F.; Stuut J.-B.W.; Torrejón F.; Lange C.B.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2012
卷: 8, 期:2
起始页码: 519
结束页码: 534
语种: 英语
Scopus关键词: climate variation ; concentration (composition) ; dendrochronology ; glacial sedimentation ; glacier dynamics ; glaciofluvial deposit ; historical record ; hydrodynamics ; ice field ; lithology ; magnetic susceptibility ; moraine ; Neoglacial ; paleoclimate ; precipitation (climatology) ; proxy climate record ; sea surface temperature ; sediment chemistry ; sedimentology ; silt ; zircon ; Aisen ; Chile ; Gualas Glacier ; Patagonia
英文摘要: Glaciers are frequently used as indicators of climate change. However, the link between past glacier fluctuations and climate variability is still highly debated. Here, we investigate the mid- to late-Holocene fluctuations of Gualas Glacier, one of the northernmost outlet glaciers of the Northern Patagonian Icefield, using a multi-proxy sedimentological and geochemical analysis of a 15 m long fjord sediment core from Golfo Elefantes, Chile, and historical documents from early Spanish explorers. Our results show that the core can be sub-divided into three main lithological units that were deposited under very different hydrodynamic conditions. Between 5400 and 4180 cal yr BP and after 750 cal yr BP, sedimentation in Golfo Elefantes was characterized by the rapid deposition of fine silt, most likely transported by fluvio-glacial processes. By contrast, the sediment deposited between 4130 and 850 cal yr BP is composed of poorly sorted sand that is free of shells. This interval is particularly marked by high magnetic susceptibility values and Zr concentrations, and likely reflects a major advance of Gualas glacier towards Golfo Elefantes during the Neoglaciation. Several thin silt layers observed in the upper part of the core are interpreted as secondary fluctuations of Gualas glacier during the Little Ice Age, in agreement with historical and dendrochronological data. Our interpretation of the Golfo Elefantes glaciomarine sediment record in terms of fluctuations of Gualas glacier is in excellent agreement with the glacier chronology proposed for the Southern Patagonian Icefield, which is based on terrestrial (moraine) deposits. By comparing our results with independent proxy records of precipitation and sea surface temperature, we suggest that the fluctuations of Gualas glacier during the last 5400 yr were mainly driven by changes in precipitation in the North Patagonian Andes. © Author(s) 2012.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49612
Appears in Collections:气候变化与战略

Files in This Item:

There are no files associated with this item.


Recommended Citation:
Bertrand S.,Hughen K.A.,Lamy F.,et al. Precipitation as the main driver of Neoglacial fluctuations of Gualas glacier, Northern Patagonian Icefield[J]. Climate of the Past,2012-01-01,8(2)
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Bertrand S.]'s Articles
[Hughen K.A.]'s Articles
[Lamy F.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Bertrand S.]'s Articles
[Hughen K.A.]'s Articles
[Lamy F.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Bertrand S.]‘s Articles
[Hughen K.A.]‘s Articles
[Lamy F.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.