globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2016.07.010
论文题名:
A cosmogenic 10Be chronology for the local last glacial maximum and termination in the Cordillera Oriental, southern Peruvian Andes: Implications for the tropical role in global climate
作者: Bromley G.R.M.; Schaefer J.M.; Hall B.L.; Rademaker K.M.; Putnam A.E.; Todd C.E.; Hegland M.; Winckler G.; Jackson M.S.; Strand P.D.
刊名: Quaternary Science Reviews
出版年: 2016
卷: 148
起始页码: 54
结束页码: 67
语种: 英语
英文关键词: Cosmogenic Be-10 ; Glaciers ; Heinrich Stadial 1 ; Last glacial maximum ; Moraine chronology ; Termination ; Tropical climate ; West Pacific warm pool
Scopus关键词: Atmospheric temperature ; Climate change ; Glacial geology ; Glaciers ; Oceanography ; Surface waters ; Cosmogenic ; Heinrich Stadial 1 ; Last Glacial Maximum ; Moraine chronology ; Termination ; Tropical climates ; West pacific ; Tropics
英文摘要: Resolving patterns of tropical climate variability during and since the last glacial maximum (LGM) is fundamental to assessing the role of the tropics in global change, both on ice-age and sub-millennial timescales. Here, we present a10Be moraine chronology from the Cordillera Carabaya (14.3°S), a sub-range of the Cordillera Oriental in southern Peru, covering the LGM and the first half of the last glacial termination. Additionally, we recalculate existing 10Be ages using a new tropical high-altitude production rate in order to put our record into broader spatial context. Our results indicate that glaciers deposited a series of moraines during marine isotope stage 2, broadly synchronous with global glacier maxima, but that maximum glacier extent may have occurred prior to stage 2. Thereafter, atmospheric warming drove widespread deglaciation of the Cordillera Carabaya. A subsequent glacier resurgence culminated at ∼16,100 yrs, followed by a second period of glacier recession. Together, the observed deglaciation corresponds to Heinrich Stadial 1 (HS1: ∼18,000–14,600 yrs), during which pluvial lakes on the adjacent Peruvian-Bolivian altiplano rose to their highest levels of the late Pleistocene as a consequence of southward displacement of the inter-tropical convergence zone and intensification of the South American summer monsoon. Deglaciation in the Cordillera Carabaya also coincided with the retreat of higher-latitude mountain glaciers in the Southern Hemisphere. Our findings suggest that HS1 was characterised by atmospheric warming and indicate that deglaciation of the southern Peruvian Andes was driven by rising temperatures, despite increased precipitation. Recalculated 10Be data from other tropical Andean sites support this model. Finally, we suggest that the broadly uniform response during the LGM and termination of the glaciers examined here involved equatorial Pacific sea-surface temperature anomalies and propose a framework for testing the viability of this conceptual model. © 2016 Elsevier Ltd
资助项目: Bromley, G.R.M. ; School of Earth & Climate Sciences and the Climate Change Institute, Edward T. Bryand Global Sciences Center, University of MaineUnited States ; 电子邮件: gordon.r.bromley1@maine.edu
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59479
Appears in Collections:过去全球变化的重建

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作者单位: School of Earth & Climate Sciences and the Climate Change Institute, Edward T. Bryand Global Sciences Center, University of Maine, Orono, ME, United States; Lamont-Doherty Earth Observatory, Geochemistry, 61 Route 9W, Palisades, NY, United States; Department of Geological Sciences, Pacific Lutheran University, Tacoma, WA, United States; Department of Earth Sciences, Dartmouth College, Hanover, NH, United States

Recommended Citation:
Bromley G.R.M.,Schaefer J.M.,Hall B.L.,et al. A cosmogenic 10Be chronology for the local last glacial maximum and termination in the Cordillera Oriental, southern Peruvian Andes: Implications for the tropical role in global climate[J]. Quaternary Science Reviews,2016-01-01,148
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