DOI: 10.5194/cp-12-787-2016
Scopus记录号: 2-s2.0-84964335236
论文题名: Terrigenous material supply to the Peruvian central continental shelf (Pisco, 14° S) during the last 1000 years: Paleoclimatic implications
作者: Briceño-Zuluaga F.J. ; Sifeddine A. ; Caquineau S. ; Cardich J. ; Salvatteci R. ; Gutierrez D. ; Ortlieb L. ; Velazco F. ; Boucher H. ; Machado C.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2016
卷: 12, 期: 3 起始页码: 787
结束页码: 798
语种: 英语
Scopus关键词: climate conditions
; continental shelf
; grain size
; intertropical convergence zone
; Little Ice Age
; paleoclimate
; reconstruction
; sediment core
; sediment transport
; terrigenous deposit
; time series analysis
; transportation
; Walker circulation
; wind stress
; Peru
英文摘要: In the eastern Pacific, lithogenic input to the ocean responds to variations in the atmospheric and oceanic system and their teleconnections over different timescales. Atmospheric (e.g., wind fields), hydrological (e.g., fresh water plumes) and oceanic (e.g., currents) conditions determine the transport mode and the amount of lithogenic material transported from the continent to the continental shelf. Here, we present the grain size distribution of a composite record of two laminated sediment cores retrieved from the Peruvian continental shelf that record the last ∼1000 years at a sub-decadal to centennial time-series resolution. We propose novel grain size indicators of wind intensity and fluvial input that allow reconstructing the oceanic-atmospheric variability modulated by sub-decadal to centennial changes in climatic conditions. Four grain size modes were identified. Two are linked to aeolian inputs (M3: ∼54; M4: ∼91 μm on average), the third is interpreted as a marker of sediment discharge (M2: ∼10 μm on average), and the last is without an associated origin (M1: ∼3 μm). The coarsest components (M3 and M4) dominated during the Medieval Climate Anomaly (MCA) and the Current Warm Period (CWP) periods, suggesting that aeolian transport increased as a consequence of surface wind stress intensification. In contrast, M2 displays an opposite behavior, exhibiting an increase in fluvial terrigenous input during the Little Ice Age (LIA) in response to more humid conditions associated with El Niño-like conditions. Comparison with other South American paleoclimate records indicates that the observed changes are driven by interactions between meridional displacement of the Intertropical Convergence Zone (ITCZ), the South Pacific Subtropical High (SPSH) and Walker circulation at decadal and centennial timescales. © Author(s) 2016. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49037
Appears in Collections: 气候变化与战略
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Recommended Citation:
Briceño-Zuluaga F.J.,Sifeddine A.,Caquineau S.,et al. Terrigenous material supply to the Peruvian central continental shelf (Pisco, 14° S) during the last 1000 years: Paleoclimatic implications[J]. Climate of the Past,2016-01-01,12(3)