DOI: 10.1016/j.quascirev.2013.05.023
Scopus记录号: 2-s2.0-84879729967
论文题名: Latest Pleistocene to Holocene hydroclimates from Lake Elsinore, California
作者: Kirby M.E. ; Feakins S.J. ; Bonuso N. ; Fantozzi J.M. ; Hiner C.A.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 76 起始页码: 1
结束页码: 15
语种: 英语
英文关键词: Deglacial
; Dipping westerlies
; Hydrogen isotope
; Lake Elsinore
; Southwest United States
Scopus关键词: Atlantic meridional overturning circulations
; Continental ice sheet
; Continuous sequences
; Deglacial
; Dipping westerlies
; Geochemical analysis
; Hydrogen isotope
; Southwest United States
; Analytical geochemistry
; Atmospheric thermodynamics
; Glaciers
; Greenhouse gases
; Hydrogen
; Isotopes
; Moisture
; Storms
; Lakes
; climatology
; deglaciation
; glacier retreat
; greenhouse gas
; Holocene
; hydrogen isotope
; hydrological change
; hydrological response
; ice sheet
; isotopic analysis
; paleoclimate
; Pleistocene
; sediment core
; sedimentology
; storm track
; wax
; westerly
; Arctic
; California
; Greenland
; Lake Elsinore
; Mexico [North America]
; Pacific Ocean
; United States
英文摘要: The hydroclimate of the southwestern United States (US) region changed abruptly during the latest Pleistocene as the continental ice sheets over North America retreated from their most southerly extent. To investigate the nature of this change, we present a new record from Lake Elsinore, located 36km inland from the Pacific Ocean in Southern California and evaluate it in the context of records across the coastal and interior southwest United States, including northwest Mexico. The sediment core recovered from Lake Elsinore provides a continuous sequence with multi-decadal resolution spanning 19-9kaBP. Sedimentological and geochemical analyses reveal hydrologic variability. In particular, sand and carbonate components indicate abrupt changes at the Oldest Dryas(OD), Bølling-Allerød (BA), and Younger Dryas (YD) transitions, consistent with the timing in Greenland. Hydrogen isotope analyses of the C28n-alkanoic acids from plant leaf waxes (δDwax) reveal a long term trend towardless negative values across 19-9kaBP. δDwax values during the OD suggest a North Pacific moisture source for precipitation, consistent with the dipping westerlies hypothesis. We find no isotopic evidence for the North American Monsoon reaching as far west as Lake Elsinore; therefore, we infer that wet/dry changes in the coastal southwest were expressed through winter-season precipitation, consistent with modern climatology. Comparing Lake Elsinore to other southwest records (notably Cave of Bells and Fort Stanton) we find coincident timing of the major transitions (OD to BA, BA to YD) and hydrologic responses during the OD and BA. The hydrologic response, however, varied during the YD consistent with a dipole between the coastal and interior southwest. The coherent pattern of hydrologic responses across the interior southwest US and northwest Mexico during the OD (wet), the BA (drier), and YD (wet) follows changes in the Atlantic Meridional Overturning Circulation, presumably via its combined influence on North Pacific winter storm tracks and the extent/magnitude of the North American Monsoon. In contrast, Lake Elsinore and the coastal southwest experiences a deglacial drying trend punctuated by abrupt change at the OD to BA and BA to YD transitions. This trend tracks rising greenhouse gases through the deglacial, with an apparent southward shift in westerly moisture sources adjusting to the retreating ice sheet. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60547
Appears in Collections: 过去全球变化的重建
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作者单位: California State University, Fullerton, Department of Geological Sciences, Fullerton, CA 92834, United States; University of Southern California, Department of Earth Sciences, Los Angeles, CA 90089, United States
Recommended Citation:
Kirby M.E.,Feakins S.J.,Bonuso N.,et al. Latest Pleistocene to Holocene hydroclimates from Lake Elsinore, California[J]. Quaternary Science Reviews,2013-01-01,76