Arid
DOI10.1016/j.palaeo.2016.03.001
50,000 years of vegetation and climate change in the southern Namib Desert, Pella, South Africa
Lim, Sophak1; Chase, Brian M.1; Chevalier, Manuel1; Reimer, Paula J.2
通讯作者Lim, Sophak
来源期刊PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN0031-0182
EISSN1872-616X
出版年2016
卷号451页码:197-209
英文摘要

This paper presents the first continuous pollen record from the southern Namib Desert spanning the last 50,000 years. Obtained from rock hyrax middens found near the town of Pella, South Africa, these data are used to reconstruct vegetation change and quantitative estimates of temperature and aridity. Results indicate that the last glacial period was characterised by increased water availability at the site relative to the Holocene. Changes in temperature and potential evapotranspiration appear to have played a significant role in determining the hydrologic balance. The record can be considered in two sections: 1) the last glacial period, when low temperatures favoured the development of more mesic Nama-Karoo vegetation at the site, with periods of increased humidity concurrent with increased coastal upwelling, both responding to lower global/regional temperatures; and 2) the Holocene, during which time high temperatures and potential evapotranspiration resulted in increased aridity and an expansion of the Desert Biome. During this latter period, increases in upwelling intensity created drier conditions at the site.


Considered in the context of discussions of forcing mechanisms of regional climate change and environmental dynamics, the results from Pella stand in clear contrast with many inferences of terrestrial environmental change derived from regional marine records. Observations of a strong precessional signal and interpretations of increased humidity during phases of high local summer insolation in the marine records are not consistent with the data from Pella. Similarly, while high percentages of Restionaceae pollen has been observed in marine sediments during the last glacial period, they do not exceed 1% of the assemblage from Pella, indicating that no significant expansion of the Fynbos Biome has occurred during the last 50,000 years. These findings pose interesting questions regarding the nature of environmental change in southwestern Africa, and the significance of the diverse records that have been obtained from the region. (C) 2016 Elsevier B.V. All rights reserved.


英文关键词South Africa Namib Desert Late Quaternary Rock hyrax middens Pollen Climate reconstruction
类型Article
语种英语
国家France ; North Ireland
收录类别SCI-E
WOS记录号WOS:000375517800016
WOS关键词LINEAR DUNE ACCUMULATION ; FOSSIL-POLLEN EVIDENCE ; LAST GLACIAL MAXIMUM ; LATE QUATERNARY ; LATE-PLEISTOCENE ; SOUTHWESTERN KALAHARI ; FORCING MECHANISMS ; HYRAX MIDDENS ; WIND-STRENGTH ; KUISEB RIVER
WOS类目Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS研究方向Physical Geography ; Geology ; Paleontology
来源机构French National Research Institute for Sustainable Development
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/195339
作者单位1.Univ Montpellier, Inst Sci Evolut Montpellier, CNRS, UMR 5554, Bat 22 CC061,Pl Eugene Bataillon, F-34095 Montpellier 5, France;
2.Queens Univ Belfast, Sch Geog Archaeol & Palaeoecol, Belfast BT7 1NN, Antrim, North Ireland
推荐引用方式
GB/T 7714
Lim, Sophak,Chase, Brian M.,Chevalier, Manuel,et al. 50,000 years of vegetation and climate change in the southern Namib Desert, Pella, South Africa[J]. French National Research Institute for Sustainable Development,2016,451:197-209.
APA Lim, Sophak,Chase, Brian M.,Chevalier, Manuel,&Reimer, Paula J..(2016).50,000 years of vegetation and climate change in the southern Namib Desert, Pella, South Africa.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,451,197-209.
MLA Lim, Sophak,et al."50,000 years of vegetation and climate change in the southern Namib Desert, Pella, South Africa".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 451(2016):197-209.
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