Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/S0031-0182(03)00277-3 |
Holocene precipitation and atmospheric changes inferred from river paleowetlands in the Bolivian Andes | |
Servant, M; Servant-Vildary, S | |
通讯作者 | Servant-Vildary, S |
来源期刊 | PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
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ISSN | 0031-0182 |
EISSN | 1872-616X |
出版年 | 2003 |
卷号 | 194期号:1-3页码:187-206 |
英文摘要 | In the southern tropical Andes, previous studies performed on lacustrine basins display large water-level fluctuations due to changes in the precipitation minus evaporation balance during the Holocene. Significant changes in groundwater levels were also inferred from river paleowetland deposits in northern Chile and the northern Bolivian Altiplano but the discrepancies which appeared in the data from paleolakes and paleowetlands are still not understood. In this paper we present stratigraphy and diatom analyses in new paleowetland records from non-glacial valleys. These data, compared with previous results, show that non-stormy precipitation (recorded by fine and/or organic sedimentation) dominated continuously from similar to 11200 to similar to 1500 cal yr BP and that convective rainfall (recorded by strong erosion) occurred only episodically in the northern Altiplano. Convective rainfall was similar to the type of precipitation which nowadays occurs during the rainy season (austral summer) when the tropical easterlies from the Atlantic reach the Bolivian Andes. Non-stormy precipitation is interpreted as a result of an intensification of cold-air incursions from southern polar regions, in good agreement with data from Brazil. The maximum intensity in cold-air incursions occurred during the Early Holocene and coincided with a climatic optimum in Antarctica and a considerably reduced El Nino Southern Oscillation (ENSO). During the Middle and Late Holocene, cold-air incursions decreased and the ENSO frequency increased. We suggest that the interactions between the southern high and low latitudes, by means of cold-air incursions and associated changes in the west wind flow, have been the main mechanisms involved in climatic changes at the latitudes of Bolivia. (C) 2003 Elsevier Science B.V. All rights reserved. |
英文关键词 | Bolivia Brazil Holocene diatoms river deposits cold-air incursions ENSO |
类型 | Article ; Proceedings Paper |
语种 | 英语 |
国家 | France |
收录类别 | SCI-E ; CPCI-S |
WOS记录号 | WOS:000182931400010 |
WOS关键词 | LATE QUATERNARY VEGETATION ; TROPICAL SOUTH-AMERICA ; LAKE-TITICACA ; CENTRAL BRAZIL ; EL-NINO ; CLIMATE VARIABILITY ; ATACAMA DESERT ; YR BP ; ALTIPLANO ; LEVEL |
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/2XILL650/145581 |
作者单位 | (1)Museum Natl Hist Nat, Antenne Inst Rech Dev, IRD, Geol Lab, F-75005 Paris, France |
推荐引用方式 GB/T 7714 | Servant, M,Servant-Vildary, S. Holocene precipitation and atmospheric changes inferred from river paleowetlands in the Bolivian Andes[J],2003,194(1-3):187-206. |
APA | Servant, M,&Servant-Vildary, S.(2003).Holocene precipitation and atmospheric changes inferred from river paleowetlands in the Bolivian Andes.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,194(1-3),187-206. |
MLA | Servant, M,et al."Holocene precipitation and atmospheric changes inferred from river paleowetlands in the Bolivian Andes".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 194.1-3(2003):187-206. |
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