DOI: 10.1016/j.palaeo.2013.09.016
论文题名: Late Glacial and Holocene record of climatic change in the southern Rocky Mountains from sediments in San Luis Lake, Colorado, USA
作者: Yuan F. ; Koran M.R. ; Valdez A.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 392 起始页码: 146
结束页码: 160
语种: 英语
英文关键词: Holocene
; Late Glacial
; North American monsoon
; Rocky Mountains
; San Luis Lake
; Stable isotope
英文摘要: Large rapid climate changes occurred over the last glacial cycle in the southwestern United States and elsewhere in many regions of the world. Some of these changes were attributed to alternations between stadial and interstadial conditions in the North Atlantic. But intense debate exists on how climate anomalies in the North Atlantic transmit to the southwest. Here we report a sediment record from San Luis Lake in southern Colorado, through analyses of grain size, magnetic susceptibility, Mg/Ca, total inorganic carbon, δ18O and δ13C, to indicate climatic and environmental changes in the southern Rocky Mountains over the last 16.5ka. We found that San Luis Lake remained hydrologically closed most of the time but overflowed during the second half of the Mystery Interval (the Big Wet: 15.7-14.9ka) and the latter part of the mid-Holocene (the Neopluvial: 4-3ka). Over the course of the last deglaciation, San Luis Lake underwent a series of large millennial-scale hydroclimatic changes such as the Big Dry (16.5-15.7ka), the Big Wet, the Bølling-Allerød dry (14.9-12.7ka), and the Younger Dryas wet (12.8-11.6ka), corresponding to warm/cold phases in the high-latitude Northern Hemisphere. The North American monsoon waxed during the Pre-Boreal interval (11.6-10.5ka) and waned through the Holocene, in phase with northward and southward displacement of the intertropical convergence zone (ITCZ). The San Luis Lake basin was relatively dry in the early Holocene (10.5-6.7ka), wet and fluctuating in the mid-Holocene (6.7-2.6ka), and dry and less variable in the late Holocene (2.6-0ka). We found evidence that extreme pluvial episodes of the southern Rocky Mountains and elsewhere in the American Southwest were coeval with cold phases of the North Pacific. Our results highlight the role of the North Pacific in modulating atmospheric circulations over the region on millennial timescales. © 2013. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69529
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Biological, Geological and Environmental Sciences, Cleveland State University, Cleveland, OH 44115, United States; Great Sand Dunes National Park, Mosca, CO 81146, United States
Recommended Citation:
Yuan F.,Koran M.R.,Valdez A.. Late Glacial and Holocene record of climatic change in the southern Rocky Mountains from sediments in San Luis Lake, Colorado, USA[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,392