Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1023/A:1014557417689 |
Holocene hydrological and climatic changes in the southern Bolivian Altiplano according to diatom assemblages in paleowetlands | |
Servant-Vildary, S; Servant, M; Jimenez, O | |
通讯作者 | Servant-Vildary, S |
来源期刊 | HYDROBIOLOGIA
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ISSN | 0018-8158 |
出版年 | 2001 |
卷号 | 466期号:1-3页码:267-277 |
英文摘要 | This paper presents the first Holocene continuous record from the southern Bolivian Altiplano. In this area, the climate is now characterized by weak summer monsoon rains. The record is located north of Salar de Uyuni in a non-glacial valley (Rio Baja). Between similar to11 600 and similar to2210 cal year BP, the rivers accumulated fine deposits, while under the present climatic conditions, the fine particles are carried downstream by strong water floods. These deposits contain a rich diatom flora showing that the valley floor was occupied by paleowetlands. Water input needed to be more or less continuous to explain that the paleowetlands survived over a long period of time. We show that diatoms can be used to reconstruct the relative variations in the water level and the salinity throughout time, despite of the spatial complexity of this type of environment. During the Holocene, the water level was low except during some periods, dated similar to11 600-9800, similar to6330-5300, and similar to3110-2210 cal year BP. Saline and freshwater microhabitats were simultaneously present in the valley floor as indicated by a mixed diatom flora evidenced throughout the record. We propose a paleoclimatic scenario based on the assumption that the NE wet atmospheric flow of the monsoon was replaced by the westerlies of the southern hemisphere at the latitude of the study site. |
英文关键词 | Bolivia Altiplano river deposits diatoms paleoclimate Holocene |
类型 | Article |
语种 | 英语 |
国家 | France |
收录类别 | SCI-E |
WOS记录号 | WOS:000174354200024 |
WOS关键词 | LAKE-TITICACA ; ATACAMA DESERT ; TROPICAL ANDES ; PALEOHYDROLOGY ; LEVEL ; PRECIPITATION ; RECORD ; BRAZIL ; DRY |
WOS类目 | Marine & Freshwater Biology |
WOS研究方向 | Marine & Freshwater Biology |
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/2XILL650/140890 |
作者单位 | (1)MNHN, Geol Lab, Antenne IRD, ESA 7073, F-75005 Paris, France;(2)Ctr Rech Ile France, IRD, F-93143 Bondy, France |
推荐引用方式 GB/T 7714 | Servant-Vildary, S,Servant, M,Jimenez, O. Holocene hydrological and climatic changes in the southern Bolivian Altiplano according to diatom assemblages in paleowetlands[J]. French National Research Institute for Sustainable Development,2001,466(1-3):267-277. |
APA | Servant-Vildary, S,Servant, M,&Jimenez, O.(2001).Holocene hydrological and climatic changes in the southern Bolivian Altiplano according to diatom assemblages in paleowetlands.HYDROBIOLOGIA,466(1-3),267-277. |
MLA | Servant-Vildary, S,et al."Holocene hydrological and climatic changes in the southern Bolivian Altiplano according to diatom assemblages in paleowetlands".HYDROBIOLOGIA 466.1-3(2001):267-277. |
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