DOI: 10.1016/j.quascirev.2017.04.028
论文题名: Evidence for orbital and North Atlantic climate forcing in alpine Southern California between 125 and 10 ka from multi-proxy analyses of Baldwin Lake
作者: Glover K.C. ; MacDonald G.M. ; Kirby M.E. ; Rhodes E.J. ; Stevens L. ; Silveira E. ; Whitaker A. ; Lydon S.
刊名: Quaternary Science Reviews
出版年: 2017
卷: 167 起始页码: 47
结束页码: 62
语种: 英语
英文关键词: Dansgaard-Oeschger events
; Hydroclimate
; Lacustrine
; Last glacial maximum
; Marine isotope stages
; Orbital forcing
; Paleoproductivity
; San Bernardino Mountains
; Southern California
; Summer insolation
Scopus关键词: Atmospheric radiation
; Atmospheric temperature
; Climate change
; Glacial geology
; Incident solar radiation
; Lakes
; Solar radiation
; Water resources
; Dansgaard-oeschger events
; Hydroclimate
; Lacustrine
; Last Glacial Maximum
; Marine isotope stages
; Orbital forcing
; Paleoproductivity
; San Bernardino Mountains
; Southern California
; Oceanography
英文摘要: We employed a new, multi-proxy record from Baldwin Lake (∼125–10 ka) to examine drivers of terrestrial Southern California climate over long timescales. Correlated bulk organic and biogenic silica proxy data demonstrated high-amplitude changes from 125 to 71 ka, suggesting that summer insolation directly influenced lake productivity during MIS 5. From 60 to 57 ka, hydrologic state changes and events occurred in California and the U.S. Southwest, though the pattern of response varied geographically. Intermediate, less variable levels of winter and summer insolation followed during MIS 3 (57–29 ka), which likely maintained moist conditions in Southern California that were punctuated with smaller-order, millennial-scale events. These Dansgaard-Oeschger events brought enhanced surface temperatures (SSTs) to the eastern Pacific margin, and aridity to sensitive terrestrial sites in the Southwest and Southern California. Low temperatures and reduced evaporation are widespread during MIS 2, though there is increasing evidence for moisture extremes in Southern California from 29 to 20 ka. Our record shows that both orbital-scale radiative forcing and rapid North Atlantic temperature perturbations were likely influences on Southern California climate prior to the last glacial. However, these forcings produced a hydroclimatic response throughout California and the U.S. Southwest that was geographically complex. This work highlights that it is especially urgent to improve our understanding of the response to rapid climatic change in these regions. Enhanced temperature and aridity are projected for the rest of the 21st century, which will place stress on water resources. © 2017 资助项目: Glover, K.C.
; Dept of Geography, University of California – Los AngelesUnited States
; 电子邮件: kcglover@ucla.edu
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59203
Appears in Collections: 过去全球变化的重建
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作者单位: Dept of Geography, University of California – Los Angeles, Los Angeles, CA, United States; Dept of Ecology and Evolutionary Biology, University of California – Los Angeles, Los Angeles, CA, United States; Department of Geological Sciences, California State University – Fullerton, Fullerton, CA, United States; Department of Earth, Planetary, and Space Sciences, UCLA, Los Angeles, CA, United States; Department of Geography, University of Sheffield, Sheffield, United Kingdom; Department of Geological Sciences, California State University – Long Beach, Long Beach, CA, United States; Institute of Environment and Sustainability, University of California – Los Angeles, 300 La Kretz, Los Angeles, CA, United States
Recommended Citation:
Glover K.C.,MacDonald G.M.,Kirby M.E.,et al. Evidence for orbital and North Atlantic climate forcing in alpine Southern California between 125 and 10 ka from multi-proxy analyses of Baldwin Lake[J]. Quaternary Science Reviews,2017-01-01,167