Arid
DOI10.1016/j.palaeo.2015.02.002
Miocene-Pliocene vegetation change in south-western Africa (ODP Site 1081, offshore Namibia)
Hoetzel, S.; Dupont, L. M.; Wefer, G.
通讯作者Dupont, L. M.
来源期刊PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN0031-0182
EISSN1872-616X
出版年2015
卷号423页码:102-108
英文摘要

Aridification is an important component of Late Neogene climate change in south-western Africa probably caused by modifications in the atmospheric circulation in relation to the initiation and intensification of the Benguela Upwelling System due to globally steepening of the meridional pressure gradient. Intensification of the meridional pressure gradient influenced the climate intensively which had then an impact on the vegetation. However, vegetation changes of south-western Africa from the Miocene to Pliocene have not yet been reported and only indirectly investigated by sedimentological data. Here, we present a pollen record of marine ODP Site 1081 retrieved 160 km offshore Namibia covering the time between 9 and 2.7 Ma. Using an endmember unmixing model we distinguished three vegetation phases as follows: a relative wet phase, during the Tortonian, showing higher representations of Cyperaceae, a transition phase during the Messinian, when especially grasses expanded, and a dry one covering the Pliocene with a strong representation of desert and semi-desert plants. The three phases indicate ongoing aridification probably caused by intensified meridional pressure gradients. Additionally, aquatic vegetation indicators appear in our pollen record from around 5 Ma on, which we attribute to a relocation of the lower course of the Cunene River to its modem outlet in the Atlantic Ocean. Redirection of the Cunene River toward the Atlantic would have deprived the palaeolalce Cunene of an important source of fresh-water ultimately resulting in desiccation of the lake and the formation of the Etosha Pan. (C) 2015 Elsevier B.V. All rights reserved.


英文关键词Pollen Miocene Pliocene Marine sediments Africa Cunene River
类型Article
语种英语
国家Germany
收录类别SCI-E
WOS记录号WOS:000351798600009
WOS关键词CLIMATE-CHANGE ; CIRCULATION ; NEOGENE ; BIOSTRATIGRAPHY ; RECONSTRUCTION ; TERRESTRIAL ; VARIABILITY ; SEDIMENTS ; OCEAN ; WATER
WOS类目Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS研究方向Physical Geography ; Geology ; Paleontology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/189501
作者单位Univ Bremen, Ctr Marine Environm Sci, MARUM, D-28359 Bremen, Germany
推荐引用方式
GB/T 7714
Hoetzel, S.,Dupont, L. M.,Wefer, G.. Miocene-Pliocene vegetation change in south-western Africa (ODP Site 1081, offshore Namibia)[J],2015,423:102-108.
APA Hoetzel, S.,Dupont, L. M.,&Wefer, G..(2015).Miocene-Pliocene vegetation change in south-western Africa (ODP Site 1081, offshore Namibia).PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,423,102-108.
MLA Hoetzel, S.,et al."Miocene-Pliocene vegetation change in south-western Africa (ODP Site 1081, offshore Namibia)".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 423(2015):102-108.
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