Late Quaternary climate history of the Bolivian Altiplano
Late Quaternary climate history of the Bolivian Altiplano
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DOI：
10.1016/s1040-6182(00)00019-7
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发表时间：
2000-01-01
影响因子：
2.2
通讯作者：
Mourguiart, P
中科院分区：
文献类型：
--
作者：
Argollo, J;Mourguiart, P
玻利维亚高原的沉积物岩心和露头被用来解释晚更新世/全新世古气候和湖泊演变的基础上多代理方法（介形虫含量，孢粉学，沉积学和放射性碳测年）。尽管湖泊盆地对环境变化的敏感性不同，但从古水文学、气候、尤其是事件发生的时间来解释这些记录是困难的。尽管存在这些问题，北部的的的喀喀湖和南部的波科尤湖（波波湖，科伊帕萨和乌尤尼的盐湖）显示出随着时间的推移总趋势的类似演变。在明钦阶段（直到30-26 kyr BP），高原比现在更潮湿。最后一次冰期（英语：Last Glacial Maximum）26-14 kyr BP），标志着凉爽，干燥的条件，其次是返回到一个潮湿的气候，中断了短期干旱事件，之间的约。14和10.5 kyr BP。另一个干旱周期，在10.5和8 kyr BP之间，在潮湿的陶卡阶段之后突然发生。中全新世被解释为气候不稳定，潮湿和干燥的交替事件。自3.9 kyr BP以来，潮湿的条件一直持续并加剧到现在。这些数据被解释在热带辐合区延伸（夏季降水）和极地空气质量强度（冬季降水）的变化。(C)2000由Elsevier Science Ltd和INQUA出版。All rights reserved.
Sediment cores and outcrops from the Bolivian Altiplano are used to interpret late Pleistocene/Holocene paleoclimates and lake evolution based on a multi-proxy approach (ostracod content, palynology, sedimentology, and radiocarbon dating). Despite the different sensitivity of the lacustrine basins to environmental changes, interpreting the records in terms of paleohydrology, climate, and more especially timing of events is difficult. Notwithstanding these problems, Lake Titicaca in the north and Lake Pocoyu (Lake Poopo, salars of Coipasa and Uyuni) in the south reveal a similar evolution in general trends through the course of time. During the Minchin phase (until 30-26 kyr BP), the Altiplano was wetter than present. The Last Glacial Maximum (ca. 26-14 kyr BP), marked by cooler, drier conditions, was followed by a return to a wetter climate, interrupted by short arid events, between ca. 14 and 10.5 kyr BP. Another cycle of aridity, between 10.5 and 8 kyr BP, took place abruptly just after the humid Tauca phase. The mid-Holocene is interpreted as climatically unstable, with an alternation of humid and dry episodes. Since 3.9 kyr BP, wetter conditions have persisted and intensified to the present. The data are interpreted in terms of changes in inter-tropical convergence zone extension (summer precipitation) and in polar air mass intensity (winter precipitation). (C) 2000 Published by Elsevier Science Ltd and INQUA. All rights reserved.