globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2012.10.013
Scopus记录号: 2-s2.0-84881369629
论文题名:
Climate, catchment runoff and limnological drivers of carbon and oxygen isotope composition of diatom frustules from the central andean altiplano during the Lateglacial and Early Holocene
作者: Hernández A.; Bao R.; Giralt S.; Sáez A.; Leng M.J.; Barker P.A.; Kendrick C.P.; Sloane H.J.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 66
起始页码: 64
结束页码: 73
语种: 英语
英文关键词: Andean altiplano ; Carbon isotopes ; Diatoms ; Lake productivity ; Oxygen isotopes ; Palaeoclimate
Scopus关键词: Andean altiplano ; Carbon isotopes ; Diatoms ; Lake productivities ; Oxygen isotopes ; Palaeoclimate ; Carbon ; Carbon dioxide ; Catchments ; Climate change ; Incident solar radiation ; Isotopes ; Productivity ; Runoff ; Sediments ; Lakes ; carbon dioxide ; carbon isotope ; catchment ; climate change ; diatom ; environmental response ; Holocene ; lacustrine deposit ; Last Glacial ; limnology ; oxygen isotope ; seasonal variation ; Altiplano ; Andenes ; Andoya ; Norway ; Pacific Ocean ; Pacific Ocean (South) ; Vesteralen ; Bacillariophyta
英文摘要: Diatom-based carbon and oxygen isotope analyses (δ13Cdiatom and δ18Odiatom) were performed on diatomrich laminated sediments of Lake Chungará (Andean Altiplano, northern Chile) deposited during the Lateglacial and Early Holocene (12,400e8300 cal years BP) to reconstruct climate change and environmental response across this major climate transition. The δ13Cdiatom data show both centennial-tomillennial scale changes related to fluctuations in lake productivity and CO2 concentration in the lake water, and variations in carbon sources to the lake through time. The δ18Odiatom data reflect changes in lake hydrology and climate. The combination of δ13Cdiatom and δ18Odiatom data reveals interactions between the internal lake processes and its catchment runoff. During wet periods (low δ18Odiatom values) δ13Cdiatom indicates an enhanced contribution of allochthonous carbon, whereas during dry periods (high δ18Odiatom) δ13Cdiatom values suggest more autochthonous carbon production and recycling. These decadal-to-centennial oscillations are not recognized after 10,000 cal years BP, possibly as a result of ENSO-like phenomenon weakening. Humid conditions during the LateglacialeEarly Holocene transition (12,400e10,100 cal years BP) were possibly due to the establishment of La Niña-like conditions in the tropical South Pacific. Whereas, dry conditions in the Early Holocene (10,100e9100 cal years BP) may be caused by the northward migration of the ITCZ due to both ENSO-like weakening and an insolation minimum. Finally, a return to humid conditions at the end of the Early Holocene (9100e8300 cal years BP) is coincident with an increase in summer insolation. © 2012 Elsevier Ltd.
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被引频次[WOS]:11   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60744
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作者单位: IDL, Faculty of Sciences, University of Lisbon, Lisboa, Lisbon, Portugal; Faculty of Sciences, University of A Coruña, Campus da Zapateira s/n, 15071 A Coruña, Spain; Institute of Earth Sciences Jaume Almera (CSIC), C/Lluís Solé i Sabarís s/n, 08028 Barcelona, Spain; Department of Stratigraphy, Paleontology and Marine Geosc., Faculty of Geology, Spain; Department of Geology, University of Leicester, Leicester LE1 7RH, United Kingdom; NERC Isotope Geosciences Laboratory, British Geological Survey, Nottingham NG12 5GG, United Kingdom; Lancaster Environment Centre, Lancaster University, Lancaster LA1 4YQ, United Kingdom

Recommended Citation:
Hernández A.,Bao R.,Giralt S.,et al. Climate, catchment runoff and limnological drivers of carbon and oxygen isotope composition of diatom frustules from the central andean altiplano during the Lateglacial and Early Holocene[J]. Quaternary Science Reviews,2013-01-01,66
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