globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13608
论文题名:
Human disturbance amplifies Amazonian El Niño–Southern Oscillation signal
作者: Bush M.B.; Correa-Metrio A.; van Woesik R.; Shadik C.R.; McMichael C.N.H.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2017
卷: 23, 期:8
起始页码: 3181
结束页码: 3192
语种: 英语
英文关键词: Amazonia ; El Niño–Southern Oscillation ; erosion ; fire ; human disturbance ; maize cultivation ; sediment analysis
Scopus关键词: Zea mays
英文摘要: The long-term interaction between human activity and climate is subject to increasing scrutiny. Humans homogenize landscapes through deforestation, agriculture, and burning and thereby might reduce the capacity of landscapes to provide archives of climate change. Alternatively, land-use change might overwhelm natural buffering and amplify latent climate signals, rendering them detectable. Here we examine a sub-annually resolved sedimentary record from Lake Sauce in the western Amazonian lowlands that spans 6900 years. Finely-laminated sediments were deposited from ca. 5000 years ago until the present, and human activity in the watershed was revealed through the presence of charcoal and maize agriculture. The laminations, analyzed for color content and bandwidth, showed distinctive changes that were coupled to more frequent occurrence of fossil maize pollen. As agricultural activity intensified ca. 2200 cal. BP, the 2- to 8-year periodicity characteristic of El Niño–Southern Oscillation became evident in the record. These agricultural activities appeared to have amplified an existing, but subtle climatic signal that was previously absorbed by natural vegetation. When agricultural activity slowed, or land use around Lake Sauce changed at ca. 800 cal. BP, the signal of El Niño–Southern Oscillation (ENSO) activity became erratic. © 2017 John Wiley & Sons Ltd
资助项目: We thank the people of the community of Sauce, Peru, for allowing us to investigate their lake. We are indebted to our colleagues Mark Brenner and Jason Curtis at the University of Florida for assistance in generating the sediment color data and some chemical analyses. This work was supported by grants from the National Science Foundation to Bush (NSF EAR-1303831) and NASA Interdisciplinary Research in Earth Science NNX14AD31G to McMichael and Bush. This work was conducted as a part of the Climate Proxies Working Group at the National Institute for Mathematical and Biological Synthesis, sponsored by the National Science Foundation through NSF Award #DBI-1300426, with additional support from the University of Tennessee, Knoxville.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60886
Appears in Collections:影响、适应和脆弱性

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作者单位: Department of Biological Sciences, Florida Institute of Technology, Melbourne, FL, United States; Instituto de Geología, Universidad Nacional Autónoma de México, Coyoacán, Mexico City, Mexico; Palaeoecology & Landscape Ecology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, Netherlands

Recommended Citation:
Bush M.B.,Correa-Metrio A.,van Woesik R.,et al. Human disturbance amplifies Amazonian El Niño–Southern Oscillation signal[J]. Global Change Biology,2017-01-01,23(8)
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