Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/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
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ISSN | 0031-0182 |
EISSN | 1872-616X |
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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