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Southwest monsoon changes indicated by oxygen isotope of ostracode shells from sediments in Qinghai Lake since the late Glacial

ISSN号：0023-074X
期刊名称：《科学通报》
时间：0
分类：P532[天文地球—古生物学与地层学;天文地球—地质学] P462.41[天文地球—大气科学及气象学]
作者机构：[1]Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China, [2]Graduate University, Chinese Academy of Sciences, Beijing 100049, China, [3]Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710054, China
相关基金：Supported by the National Basic Research Program of China （Grant Nos. 2004CB720200 and 2005CB422002））, the National Natural Science Foundation of China （Grant No. 40373016） and the National Natural Science Foundation of Distinguished Young Scholars of China （Grant No. 40625007）

作者： LIU XingQi[1], SHEN Ji[1], WANG SuMin[1], WANG YongBo[1,2], LIU WeiGuo[3]

关键词：冰河晚期, 青海湖, 沉积物, 介形亚纲动物壳, 氧同位素, 西南季风, Qinghai Lake, δ^18O, ostracode shell, southwest monsoon

中文摘要：

在核心 QH-2000 fromQinghai 湖的沉积的 ostracode 壳的δ ~(18 ) O 记录能被用作一个更好的代理反映季风变化。在 17.5 和 11 cal 之间的低季风降水。ka BP 被快平均 2.37per thousand.A 的 O 价值在δ ~(18 ) 转移的积极δ ~(18 ) 显示 O 从在 11 cal 积极。ka BP 到在 10 cal 否定。ka BP 显示季风降水的锋利的增加。通常高的季风降水的间隔在 10 和 6 cal 之间被观察。有 O 珍视平均 -2.15per 的δ ~(18 ) 的 ka BP 千。在 6 和 2.5 cal 之间的季风降水的减少。ka BP 被 O 珍视的积极δ ~(18 ) 显示。δ ~(18 ) O 使价值积极平均 3.0per 千在 2.5 和 0 cal 之间。建议低高季风降水的 ka BP。O 从金海·莱克和我们的更宽广的地区性的比较在核心 QH-2000 的沉积 ostracode 壳记录的δ ~(18 ) 显示的气候的变化证明气候 inQinghai 湖自从晚冰川被除东南季风以外的西南季风可能控制。

英文摘要：

The δ^18O records of ostracode shells in sediments of core QH-2000 from Qinghai Lake can be used as a better proxy to reflect monsoon changes. Low monsoon precipitation between 17.5 and 11 cal. ka BP is indicated by positive δ^18O values averaging 2.37‰. A fast shift in δ^18O from positive at 11 cal. ka BP to negative at 10 cal. ka BP indicates sharp increase of monsoon precipitation. An interval of generally high monsoon precipitation is observed between 10 and 6 cal. ka BP with δ^18O values averaging -2.15‰. Decrease of monsoon precipitation between 6 and 2.5 cal. ka BP is indicated by positive δ^18O values. δ^18O keeps positive values averaging 3.0‰ between 2.5 and 0 cal. ka BP suggesting low high monsoon precipitation. The climatic changes indicated by δ^18O records of ostracode shells in sediments of core QH-2000 from Qinghai Lake and our broader regional comparison show that the climate in Qinghai Lake since the late Glacial is probably controlled by southwest monsoon other than southeast monsoon.

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