DOI: 10.1016/j.quascirev.2017.06.033
论文题名: Late Pleistocene glacial fluctuations in Cordillera Oriental, subtropical Andes
作者: Martini M.A. ; Kaplan M.R. ; Strelin J.A. ; Astini R.A. ; Schaefer J.M. ; Caffee M.W. ; Schwartz R.
刊名: Quaternary Science Reviews
出版年: 2017
卷: 171 起始页码: 245
结束页码: 259
语种: 英语
英文关键词: Cosmogenic isotopes
; Glacial geomorphology
; Glaciation
; Paleoclimatology
; Pleistocene
; South America
Scopus关键词: Climate change
; Climatology
; Cooling systems
; Earth (planet)
; Tropics
; Cosmogenic isotopes
; Glacial geomorphology
; Glaciation
; Paleoclimatology
; Pleistocene
; South America
; Glacial geology
英文摘要: The behavior of subtropical glaciers during Middle to Late Pleistocene global glacial maxima and abrupt climate change events, specifically in Earth's most arid low-latitude regions, remains an outstanding problem in paleoclimatology. The present-day climate of Cordillera Oriental, in arid northwestern Argentina, is influenced by shifts in subtropical climate systems, including the South American Summer Monsoon. To understand better past glacier-subtropical climates during the global Last Glacial Maximum (LGM, 26.5–19 ka) and other time periods, we combined geomorphic features with forty-two precise 10Be ages on moraine boulders and reconstructed paleo-equilibrium line altitudes (ELA) at Nevado de Chañi (24°S) in the arid subtropical Andes. We found a major glacial expansion at ∼23 ± 1.6 ka, that is, during the global LGM. Additional glacial expansions are observed before the global LGM (at ∼52–39 ka), and after, at 15 ± 0.5 and 12 ± 0.6 ka. The ∼15 ka glacial event was found on both sides of Chañi and the ∼12 ka event is only recorded on the east side. Reconstructed ELAs of the former glaciers exhibit a rise from east to west that resembles the present subtropical climate trajectory from the Atlantic side of the continent; hence, we infer that this climate pattern must have been present in the past. Based on comparison with other low-latitude paleoclimate records, such as those from lakes and caves, we infer that both temperature and precipitation influenced past glacial occurrence in this sector of the arid Andes. Our findings also imply that abrupt deglacial climate events associated with the North Atlantic, specifically curtailed meridional overturning circulation and regional cooling, may have had attendant impacts on low subtropical Southern Hemisphere latitudes, including the climate systems that affect glacial activity around Nevado de Chañi. © 2017 Elsevier Ltd 资助项目: Martini, M.A.
; Centro de Investigaciones en Ciencias de la Tierra (CONICET-UNC), Vélez Sársfield 1611, Argentina
; 电子邮件: mmartini@unc.edu.ar
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59132
Appears in Collections: 过去全球变化的重建
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作者单位: Centro de Investigaciones en Ciencias de la Tierra (CONICET-UNC), Vélez Sársfield 1611, Córdoba, Argentina; Geochemistry, Lamont-Doherty Earth Observatory, Palisades, NY, United States; Instituto Antártico Argentino, Convenio MREC - Universidad Nacional de Córdoba, Vélez Sársfield 1611, Córdoba, Argentina; Department of Earth and Environmental Sciences, Columbia University, New York, NY, United States; Department of Physics and Astronomy, Purdue University, West Lafayette, IN, United States; Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, IN, United States
Recommended Citation:
Martini M.A.,Kaplan M.R.,Strelin J.A.,et al. Late Pleistocene glacial fluctuations in Cordillera Oriental, subtropical Andes[J]. Quaternary Science Reviews,2017-01-01,171