Moisture changes over the last millennium in arid central Asia: a review, synthesis and comparison with monsoon region
Moisture changes over the last millennium in arid central Asia: a review, synthesis and comparison with monsoon region
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干旱中亚近千年的水分变化：回顾、综合及与季风区的比较
DOI：
10.1016/j.quascirev.2010.01.005
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发表时间：
2010-04-01
影响因子：
4
通讯作者：
Zhang, Jia-Wu
中科院分区：
文献类型：
--
作者：
Chen, Fa-Hu;Chen, Jian-Hui;Zhang, Jia-Wu
20世纪气候变暖将导致全球降水分布、水文循环和有效湿度变化的差异。中亚干旱区是全球气候变暖影响最大的地区之一，其大气环流主要受西风带控制。了解这些地区过去有效湿度的变化是预测未来水文变化的重要前提。在这里，我们评估了ACA中17个记录的不同代理记录的有效湿度变化的空间和时间模式，并使用基于可靠年表和鲁棒代理选择的17个记录中的5个合成了ACA在过去一千年的十年分辨率湿度曲线。高分辨率和低分辨率数据都表明，在过去一千年中，ACA的特点是相对干燥的中世纪温暖期（MWP：从公元1000年到1350年的时期），潮湿的小冰期（LIA）。从1500年到1850年的相似）和近几十年来越来越多的水分作为一个整体，在ACA的LIA不仅是相对潮湿，但也有高降水。近千年来，ACA的几百年湿度变化与北方半球、中国和中亚西部的温度变化基本上呈反相关，ACA的有效湿度历史与亚洲季风区的有效湿度历史（特别是在LIA期间）也呈反相位关系。我们认为，ACA的潮湿LIA，可能延伸到地中海和西欧，可能是由于更频繁的中纬度气旋活动导致的降水增加，这是西风急流加强和向赤道移动的结果，以及主要的负北大西洋涛动条件，再加上当时的冷却导致的蒸发蒸腾量减少（C）2010 Elsevier Ltd.保留所有权利
There is a strong chance that 20th century warming will cause differences in precipitation distribution, hydrological cycle and effective moisture changes over the globe Arid central Asia (ACA), a unique dry-land area whose atmospheric circulation is dominated today by the westerlies, is one of the specific regions that are likely to be strongly impacted by global warming. An understanding of past variations in effective moisture in such regions is an important prerequisite for the prediction of future hydrological change. Here we evaluate spatial and temporal patterns of effective moisture variations documented by different proxies from 17 records in ACA, and synthesize a decadal-resolution moisture curve for ACA over the past millennium, using 5 of the 17 records selected on the basis of reliable chronologies and robust proxies The high- and low-resolution data all show that, over the past millennium, ACA has been characterized by a relatively dry Medieval Warm Period (MWP: the period from similar to 1000 to 1350 AD), a wet Little Ice Age (LIA. from similar to 1500 to 1850 AD) and increasing moisture during recent decades As a whole, the LIA in the ACA was not only relatively humid but also had high precipitation. Over the past millennium, the multi-centennial moisture changes in ACA show a generally inverse relationship with the temperature changes in the Northern Hemisphere, China, and western central Asia The effective moisture history in ACA also shows an out-of-phase relationship with that in monsoon Asia (especially during the LIA). We propose that the humid LIA in ACA, possibly extending to Mediterranean Sea and Western Europe, may have resulted from increased precipitation due to more frequent mid-latitude cyclone activities as a result of the strengthening and equator-ward shift of the westerly jet stream, and the predominantly negative North Atlantic Oscillation conditions, coupled with a decrease in evapo-transpiration caused by the cooling at that time (C) 2010 Elsevier Ltd. All rights reserved