DOI: 10.5194/cp-8-403-2012
Scopus记录号: 2-s2.0-84858858809
论文题名: Little Ice Age advance and retreat of Glaciar Jorge Montt, Chilean Patagonia
作者: Rivera A. ; Koppes M. ; Bravo C. ; Aravena J.C.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2012
卷: 8, 期: 2 起始页码: 403
结束页码: 414
语种: 英语
Scopus关键词: bathymetry
; buoyancy
; glaciology
; Little Ice Age
; paleoclimate
; paleoenvironment
; radiocarbon dating
; twentieth century
; velocity
; Chile
英文摘要: Glaciar Jorge Montt (48°20' S/73°30' W), one of the main tidewater glaciers of the Southern Patagonian Icefield (SPI), has experienced the greatest terminal retreat observed in Patagonia during the past century, with a recession of 19.5 km between 1898 and 2011. This retreat has revealed trees laying subglacially until 2003. These trees were dated using radiocarbon, yielding burial ages between 460 and 250 cal yrs BP. The presence of old growth forest during those dates indicates that Glaciar Jorge Montt was upvalley of its present position before the commonly recognized Little Ice Age (LIA) period in Patagonia. The post-LIA retreat was most likely triggered by climatically induced changes during the 20th century; however, Glaciar Jorge Montt has responded more dramatically than its neighbours. The retreat of Jorge Montt opened a 19.5 km long fjord since 1898, which reaches depths in excess of 390 m. The bathymetry is well correlated with glacier retreat rates, suggesting that dynamic responses of the glacier are at least partially connected to near buoyancy conditions at the ice front, resulting in high calving fluxes, accelerating thinning rates and rapid ice velocities. © 2012 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49609
Appears in Collections: 气候变化与战略
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Recommended Citation:
Rivera A.,Koppes M.,Bravo C.,et al. Little Ice Age advance and retreat of Glaciar Jorge Montt, Chilean Patagonia[J]. Climate of the Past,2012-01-01,8(2)