DOI: 10.1016/j.quascirev.2013.06.021
Scopus记录号: 2-s2.0-84880444029
论文题名: Rainfall response to orbital and millennial forcing in northern Peru over the last 18ka
作者: Mollier-Vogel E. ; Leduc G. ; Böschen T. ; Martinez P. ; Schneider R.R.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 76 起始页码: 29
结束页码: 38
语种: 英语
英文关键词: Deglaciation
; Heinrich 1
; Holocene
; ITCZ
; Speleothem
; XRF
; Younger Dryas
Scopus关键词: Deglaciations
; Heinrich 1
; Holocenes
; ITCZ
; Speleothem
; XRF
; Younger Dryas
; Catchments
; Glacial geology
; Runoff
; Rain
; deglaciation
; Heinrich event
; Holocene
; orbital forcing
; rainfall
; speleothem
; X-ray fluorescence
; Younger Dryas
; Peru
英文摘要: We present a high-resolution marine record of sediment input from the Guayas River, Ecuador, that reflects changes in precipitation along western equatorial South America during the last 18ka. We use log (Ti/Ca) derived from X-ray Fluorescence (XRF) to document terrigenous input from riverine runoff that integrates rainfall from the Guayas River catchment. We find that rainfall-induced riverine runoff has increased during the Holocene and decreased during the last deglaciation. Superimposed on those long-term trends, we find that rainfall was probably slightly increased during the Younger Dryas, while the Heinrich event 1 was marked by an extreme load of terrigenous input, probably reflecting one of the wettest period over the time interval studied. When we compare our results to other Deglacial to Holocene rainfall records located across the tropical South American continent, different modes of variability become apparent. The records of rainfall variability imply that changes in the hydrological cycle at orbital and sub-orbital timescales were different from western to eastern South America. Orbital forcing caused an antiphase behavior in rainfall trends between eastern and western equatorial South America. In contrast, millennial-scale rainfall changes, remotely connected to the North Atlantic climate variability, led to homogenously wetter conditions over eastern and western equatorial South America during North Atlantic cold spells. These results may provide helpful diagnostics for testing the regional rainfall sensitivity in climate models and help to refine rainfall projections in South America for the next century. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60539
Appears in Collections: 过去全球变化的重建
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作者单位: Institute of Geosciences, University of Kiel, Germany; GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany; Université Bordeaux 1, UMR, CNRS 5805 EPOC, Avenue des facultés, 33405 Talence Cedex, France
Recommended Citation:
Mollier-Vogel E.,Leduc G.,Böschen T.,et al. Rainfall response to orbital and millennial forcing in northern Peru over the last 18ka[J]. Quaternary Science Reviews,2013-01-01,76