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A 1000-year chironomid-based salinity reconstruction from varved sediments of Sugan Lake, Qaidam Basin, arid Northwest China, and its palaeoclimatic significance

ISSN号：1000-0240
期刊名称：《冰川冻土》
时间：0
分类：P618.130.2[天文地球—矿床学;天文地球—地质学] X144[环境科学与工程—环境科学]
作者机构：[1]MOE Key Laboratory of Western China's Environmental Systems, Lanzhou University, Lanzhou 730000, China, [2]State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China, [3]Department of Entomology, Natural History Museum, London SW7 5BD, UK
相关基金：Supported by the Fund for Creative Research Groups, National Natural Science Foundation of China （Grant No. 40721061） and Research Fund for the Doctoral Program of Higher Education （Grant No. 20060730003）

作者： CHEN JianHui[1], CHEN FaHu[1], ZHANG EnLou[2], BROOKS Stephen J[3], ZHOU AiFeng[1], ZHANG JiaWu[1]

关键词：西北干旱地区, 柴达木盆地, 古气候意义, 沉积物, 中国, 盐度, 纹层, Sugan Lake, arid Northwest China, sub-fossil chironomid, effective moisture, last millennium

中文摘要：

一 1000 年高分辨率(∼10 年) 从粗毯子湖的 varved 沉积的 chironomid 记录，北西藏的高原上的 Qaidam 盆，被介绍。chironomid 集合主要由组成相对 high-saline-water 税一种 Psectrocladius barbimanus 类型和 Orthocladius/Cricotopus，并且相对 low-saline-water 税一种 Procladius 和 Psectrocladius sordidellus 类型。在 chironomid 动物志和推断的咸度的变化建议在最后千年上，粗毯子湖集水在对比气候的条件之间轮流出现，有在时期期间的干燥气候 990 1550 广告，相对潮湿的气候在小冰川期( LIA )( 1550 1840 广告)期间，并且干燥气候再从 1840 广告向前。在对一百年的规模十，在 1200 1230 广告附近的一个湿事件，打断通常干旱的时期(990 1550 广告) ，并且在 1590 1700 广告附近的一个干燥事件，标点通常潮湿的时期(1550 1840 广告) ，清楚地被记录。当咸度变化具有更大的大小和更高的频率时，在基于 chironomid 的咸度时间系列的趋势在 LIA 期间显示高度不稳定的气候。在粗毯子湖集水的有效潮湿进化由分析在对数据在干旱西北中国(ANC ) 从另外的地点导出的以前的 palaeo 潮湿的宽广同意的 chironomid 在最后千年期间重建了。LIA，在西统治 ANC 上由通常潮湿的条件描绘了与显然不同在 monsoonal 中国，暗示“ out-of-phase ”在在这二个区域的潮湿进化之间的关系在过去的 1000 年期间。

英文摘要：

A 1000-year high-resolution （-10 years） chironomid record from varved sediments of Sugan Lake, Qaidam Basin on the northern Tibetan Plateau, is presented. The chironomid assemblages are mainly composed of the relatively high-saline-water taxa Psectrocladius barbimanus-type and Orthocladius/ Cricotopus, and the relatively low-saline-water taxa Procladius and Psectrocladius sordidellus-type. Variations in the chironomid fauna and inferred salinities suggest that over the last millennium, the Sugan Lake catchment has alternated between contrasting climatic conditions, having a dry climate during the period 990-1550 AD, a relatively humid climate during the Little Ice Age （LIA）（1550-1840 AD）, and a dry climate again from 1840 AD onwards. At the decadal to centennial scale, a wet event around 1200-1230 AD, interrupting the generally arid period （990-1550 AD）, and a dry event around 1590-1700 AD, punctuating the generally humid period （1550-1840 AD）, are clearly documented. Trends in the chironomid-based salinity time series indicate a highly unstable climate during the LIA when salinity fluctuations were of greater magnitude and higher frequency. The effective moisture evolution in the Sugan Lake catchment during the last millennium reconstructed by chironomid analysis is in broad agreement with previous palaeo-moisture data derived from other sites in arid Northwest China （ANC）. The LIA, characterized by generally humid conditions over the westerly-dominated ANC was distinctly different from that in monsoonal China, implying an ＂out-of-phase＂ relationship between moisture evolution in these two regions during the past 1000 years.

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