| 项目编号: | NE/J00443X/1
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| 项目名称: | Influence of Orbital Forcing on ENSO variability - new insights from an annually laminated speleothem |
| 作者: | Philip Jeffrey Hopley
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| 承担单位: | Birkbeck College
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| 批准年: | 2010
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| 开始日期: | 2011-01-09
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| 结束日期: | 2014-31-08
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| 资助金额: | GBP77215
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| 资助来源: | UK-NERC
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| 项目类别: | Research Grant
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| 国家: | UK
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| 语种: | 英语
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| 特色学科分类: | Archaeology 
; (15%)
; Climate & Climate Change 
; (65%)
; Terrest. & freshwater environ. 
; (20%)
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| 英文摘要: | Future climate change scenarios suggest the African continent will become increasingly susceptible to extreme changes in rainfall (droughts and flooding). Attempts to predict rainfall variability in Africa have been limited by our poor understanding of what controls past variability; for example characterising the influence of El Niño-Southern Oscillation (ENSO) and the Indian Ocean Dipole (IOD) on African hydrology. The warmer conditions of the early Pleistocene when the Walker Circulation and ENSO become established offer an analogue to future African climate variability. We propose to investigate these issues by utilising a unique annually laminated half a million year long speleothem deposit from South Africa - the Buffalo Cave flowstone. Building on our previous millennial scale record of African rainfall, we now propose to expand proxy resolution to annual for band thickness and decadal for stable isotopes. The program of annual band thickness counting and stable isotope measurement will generate a rainfall record of unprecedented length and temporal resolution, enabling us to investigate the controls on African rainfall variability at a range of timescales from inter-annual to orbital. The Buffalo Cave flowstone record covers the time period ca. 2.0-1.5 Ma, based on preliminary dating evidence, and crosses one of the most important climate transitions in the Tropics, the intensification of the Walker circulation between 1.8 and 1.7 Ma. We will thus be able to characterise changes in South African rainfall before, during and after the establishment of this fundamental feature of the modern climate system. It will allow us to understand the evolution of the ENSO system and the long term influence of the IOD. This research will provide new insights into rainfall variability in the past, and will aid our predictions of future rainfall in Africa. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/103422
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| Appears in Collections: | 科学计划与规划
气候变化与战略
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| Recommended Citation: | |
Philip Jeffrey Hopley. Influence of Orbital Forcing on ENSO variability - new insights from an annually laminated speleothem. 2010-01-01.
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