DOI: 10.1016/j.quascirev.2015.10.037
Scopus记录号: 2-s2.0-84947760779
论文题名: Holocene paleoclimate history of Fallen Leaf Lake, CA., from geochemistry and sedimentology of well-dated sediment cores
作者: Noble P.J. ; Ball G. ; Zimmerman S.H. ; Maloney J. ; Smith S.B. ; Kent G. ; Adams K.D. ; Karlin R.E. ; Driscoll N.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 131 起始页码: 193
结束页码: 210
语种: 英语
英文关键词: Geochemistry
; Great Basin
; Holocene
; Lake cores
; Lake Tahoe basin
; Neopluvial
; Paleoclimate
Scopus关键词: Biogeochemistry
; Biological materials
; Geochemistry
; Glacial geology
; Lead
; Organic compounds
; Sediments
; Great Basin
; Holocenes
; Lake Tahoe Basin
; Neopluvial
; Paleoclimates
; Lakes
; Holocene
; lacustrine deposit
; Little Ice Age
; organic matter
; paleoclimate
; pebble
; precipitation (climatology)
; sediment chemistry
; sediment core
; sedimentation rate
; sedimentology
; terrigenous deposit
; Great Basin
; Lake Tahoe Basin
; United States
; algae
英文摘要: Millennial-scale shifts in aridity patterns have been documented during the Holocene in the western United States, yet the precise timing, severity, and regional extent of these shifts prompts further study. We present lake sediment core data from Fallen Leaf Lake, a subalpine system at the southern end of the Lake Tahoe basin for which 80% of the contemporary inflow is derived from snowpack delivered by Pacific frontal storm systems. A high quality age model has been constructed using 14C ages on plant macrofossils, 210Pb, and the Tsoyowata tephra datum (7.74-7.95 cal kyr BP). One core captures the transition from the Late Tioga-younger Dryas glaciolacustrine package to laminated opaline clay at 11.48 cal kyr BP. Early Holocene sedimentation rates are relatively high (~1.9 mm/year) and cooler winter temperatures are inferred by the presence of pebbles interpreted to be transported out into the lake via shore ice. There is a geochemically distinct interval from ~4.71 to 3.65 cal kyr BP that is interpreted as a late Holocene neopluvial, characterized by depleted δ13C and lower C:N that point to reduced runoff of terrigenous organic matter, increased winter precipitation, and increased algal productivity. The largest Holocene signal in the cores occurs at the end of the neopluvial, at 3.65 cal kyr BP, and marks a shift into a climate state with variable precipitation, yet is overall more arid than the neopluvial. This new climate state persists for ~3 ka, until the Little Ice Age. Low sedimentation rates (0.5 mm/year), the homogeneous opaline sediment, and steadily increasing contributions of terrestrial vs. algal organic matter in these cores suggest that the lowstand state of Fallen Leaf Lake may have been the norm from 3.65 to 0.55 cal kyr BP, punctuated by short term high precipitation years or multi-year intervals capable of rapid short duration lake level rise. Fallen Leaf Lake is strongly influenced by changes in winter precipitation and temperature, manifested largely by the geochemical proxies, and highlights unique advantages of subalpine lakes in regional paleoclimate reconstructions. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59729
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: Department of Geological Sciences and Engineering, University of Nevada, Reno, NV, United States; Chevron Energy Technology Company, 1500 Louisiana Street, Houston, TX, United States; Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, CA, United States; Department of Geological Sciences, San Diego State University, San Diego, CA, United States; Nevada Seismological Laboratory, University of Nevada, Reno, NV, United States; Division of Earth and Ecosystem Sciences, Desert Research Institute, Reno, NV, United States; Scripps Institute of Oceanography, Geosciences Research Division, La Jolla, CA, United States
Recommended Citation:
Noble P.J.,Ball G.,Zimmerman S.H.,et al. Holocene paleoclimate history of Fallen Leaf Lake, CA., from geochemistry and sedimentology of well-dated sediment cores[J]. Quaternary Science Reviews,2016-01-01,131