| DOI: | 10.1002/2014GL059361
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| 论文题名: | The pace of East African monsoon evolution during the Holocene |
| 作者: | Weldeab S.; Menke V.; Schmiedl G.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-10321
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| EISSN: | 1944-10052
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| 出版年: | 2014
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| 卷: | 41, 期:5 | | 起始页码: | 1724
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| 结束页码: | 1731
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| 语种: | 英语
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| 英文关键词: | Ba/Ca
; East African monsoon
; Holocene
; Nile River
; planktonic foraminifers
; runoff
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| Scopus关键词: | Climate change
; Incident solar radiation
; Nonlinear feedback
; Rivers
; Runoff
; Vegetation
; Climate dynamics
; East africans
; Eastern Mediterranean sea
; Foraminifers
; Holocenes
; Human settlements
; Nile rivers
; Vegetation change
; Atmospheric thermodynamics
; climate change
; Holocene
; monsoon
; proxy climate record
; river discharge
; runoff
; East Africa
; Nile Basin
; Foraminifera
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| 英文摘要: | African monsoon precipitation experienced a dramatic change in the course of the Holocene. The pace with which the African monsoon shifted from a strong early to middle to a weak late Holocene is critical for our understanding of climate dynamics, hydroclimate-vegetation interaction, and shifts of prehistoric human settlements, yet it is controversially debated. On the basis of planktonic foraminiferal Ba/Ca time series from the eastern Mediterranean Sea, here we present a proxy record of Nile River runoff that provides a spatially integrated measure of changes in East African monsoon (EAM) precipitation. The runoff record indicates a markedly gradual middle to late Holocene EAM transition that lasted over 3500 years. The timing and pace of runoff change parallels those of insolation and vegetation changes over the Nile basin, indicating orbitally forced variation of insolation as the main EAM forcing and the absence of a nonlinear precipitation-vegetation feedback. A tight correspondence between a threshold level of Nile River runoff and the timing of occupation/abandonment of settlements suggests that along with climate changes in the eastern Sahara, the level of Nile River and intensity of summer floods were likely critical for the habitability of the Nile Valley (Egypt). Key Points Twelve thousand year record of Nile River discharge and East African monsoon evolution Three thousand five hundred year period of gradual middle to late Holocene transition of East African monsoon Synchronous pacing of middle to late Holocene hydroclimate and vegetation changes ©2014. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84895776941&doi=10.1002%2f2014GL059361&partnerID=40&md5=a1c6609098cf613eb5bbecc5e6bc64e3
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/7585
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Department of Earth Science, University of California, Santa Barbara CA, United States
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| Recommended Citation: | |
Weldeab S.,Menke V.,Schmiedl G.. The pace of East African monsoon evolution during the Holocene[J]. Geophysical Research Letters,2014-01-01,41(5).
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