DOI: 10.1016/j.quascirev.2015.05.027
Scopus记录号: 2-s2.0-84936771311
论文题名: Radiocarbon chronology of the last glacial maximum and its termination in northwestern Patagonia
作者: Moreno P.I. ; Denton G.H. ; Moreno H. ; Lowell T.V. ; Putnam A.E. ; Kaplan M.R.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 122 起始页码: 233
结束页码: 249
语种: 英语
英文关键词: Heinrich Stadial 1
; Last glacial maximum
; Last glacial termination
; Licán ignimbrite
; Llanquihue moraines
; North Patagonian rainforests
; Northwestern Patagonia
; Nothofagus rise
; Southern mid-latitudes
Scopus关键词: Geochronology
; Oceanography
; Heinrich Stadial 1
; Ignimbrites
; Last Glacial Maximum
; Last glacial terminations
; Llanquihue moraines
; Midlatitudes
; North Patagonian rainforests
; Nothofagus
; Patagonia
; Glacial geology
; chronology
; deglaciation
; evergreen forest
; glacial-interglacial cycle
; glacier retreat
; Heinrich event
; Holocene
; ignimbrite
; interstadial
; intertropical convergence zone
; Last Glacial Maximum
; meridional circulation
; midlatitude environment
; moraine
; radiocarbon dating
; rainforest
; Southern Hemisphere
; temperate environment
; temperature gradient
; warming
; westerly
; Andes
; Atlantic Ocean
; Atlantic Ocean (North)
; New Zealand
; Pacific Ocean
; Patagonia
; South Island
; Southern Alps
; Langat virus
; Nothofagus
英文摘要: We examine the timing and magnitude of the last glacial maximum (LGM) and the last glacial termination (LGT) in northwestern Patagonia, situated in the middle latitudes of South America. Our data indicate that the main phase of the LGT began with abrupt warm pulses at 17,800 and 17,100calyrs BP, accompanied by rapid establishment of evergreen temperate rainforests and extensive deglaciation of the Andes within 1000 years. This response shows that South American middle-latitude temperatures had approached average interglacial values by 16,800calyrs BP. The temperature rise in northwestern Patagonia coincides with the beginning of major warming and glacier recession in the Southern Alps of New Zealand at southern mid-latitudes on the opposite side of the Pacific Ocean. From this correspondence, the warming that began at 17,800calyrs BP appears to have been widespread in middle latitudes of the Southern Hemisphere, accounting for at least 75% of the total temperature recovery from the LGM to the Holocene. Moreover, this warming pulse is coeval with the first half of the Heinrich Stadial 1 (HS1) in the North Atlantic region. HS1 featured a decline of North Atlantic meridional overturning circulation, a southward shift of the westerly wind belt in both hemispheres and of the Intertropical Convergence Zone, as well as a weakening of the Asian monsoon. Along with the initiating trigger, identifying the mechanisms whereby these opposing climate signals in the two polar hemispheres interacted -whether through an oceanic or an atmospheric bipolar seesaw, or both- lies at the heart of understanding the LGT. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60083
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Ecological Sciences, Millennium Institute of Ecology and Biodiversity, Center for Climate Research and Resilience, and Millennium Nucleus Paleoclimate of the Southern Hemisphere, Universidad de Chile, Santiago, Chile; School of Earth and Climate Sciences and Climate Change Institute, University of Maine, Orono, ME, United States; Observatorio Volcanológico de los Andes del Sur, Servicio Nacional de Geología y Minería, Temuco, Chile; Department of Geology, University of Cincinnati, Cincinnati, 500 Geology/Physics Building, Cincinnati, OH, United States; Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, United States
Recommended Citation:
Moreno P.I.,Denton G.H.,Moreno H.,et al. Radiocarbon chronology of the last glacial maximum and its termination in northwestern Patagonia[J]. Quaternary Science Reviews,2015-01-01,122