DOI: 10.1002/2015GL063196
论文题名: Terrestrial environmental changes around the Gulf of Aden over the last 210 kyr deduced from the sediment n-alkane record: Implications for the dispersal of Homo sapiens
作者: Isaji Y. ; Kawahata H. ; Ohkouchi N. ; Murayama M. ; Tamaki K.
刊名: Geophysical Research Letters
ISSN: 0094-8876
EISSN: 1944-8607
出版年: 2015
卷: 42, 期: 6 起始页码: 1880
结束页码: 1887
语种: 英语
英文关键词: Gulf of Aden
; Homo sapiens
; precipitation
; terrestrial biomarker
; vegetation
Scopus关键词: Biodiversity
; Precipitation (chemical)
; Sea level
; Vegetation
; Environmental change
; Favorable conditions
; Gulf of Aden
; Homo sapiens
; Lithogenic material
; Terrestrial biomarkers
; Terrestrial environments
; Vegetation biomass
; Paraffins
; alkane
; environmental change
; fossil record
; paleoclimate
; precipitation (climatology)
; sediment chemistry
; terrestrial environment
; Arabian Sea
; Gulf of Aden
; Indian Ocean
; Homo sapiens
英文摘要: We analyzed long-chain (C25-C36) n-alkanes and pollen grains in sediments from the Gulf of Aden covering the last 212kyr to reconstruct the surrounding terrestrial environment, a critical region for the dispersal of Homo sapiens. Substantial increases in the flux of n-alkanes during 200-185, 120-95, and 70-50ka were interpreted to indicate enhanced vegetation biomass in the Arabian Peninsula and the northern part of the Horn of Africa or increase in lithogenic material inputs. Periods of enhanced n-alkane flux occurred during or immediately after pluvial episodes, indicating that the increased precipitation may have induced substantially enhanced vegetation biomass, creating favorable conditions for Homo sapiens. Additionally, vegetation may have increased due to moderate precipitation unrecorded by speleothems or in accordance with the lowering of sea level, indicating that the dispersal might have been possible even after the shift to an arid environment indicated by the speleothems. Key Points The flux of long-chain n-alkanes was reconstructed from the Gulf of Aden sediments Periods of high n-alkane flux may reflect enhanced vegetation on nearby land Enhanced vegetation may have favored Homo sapiens dispersal out of Africa ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84927800645&doi=10.1002%2f2015GL063196&partnerID=40&md5=feba83eafee1765825407a8e25632cab
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8492
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Atmosphere and Ocean Research Institute, University of Tokyo, Chiba, Japan
Recommended Citation:
Isaji Y.,Kawahata H.,Ohkouchi N.,et al. Terrestrial environmental changes around the Gulf of Aden over the last 210 kyr deduced from the sediment n-alkane record: Implications for the dispersal of Homo sapiens[J]. Geophysical Research Letters,2015-01-01,42(6).