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题名: Chemical weathering over the last 1200 years recorded in the sediments of Gonghai Lake, Lvliang Mountains, North China: a high-resolution proxy of past climate
作者: Liu, JB(刘建宝); Chen, JH(陈建徽); Selvaraj, K; Xu, QH; Wang, ZL(王宗礼); Chen, FH(陈发虎)
收录类别: SCIE ; BIOSIS
出版日期: 2014-10
刊名: BOREAS
卷号: 43, 期号:4, 页码:914-923
出版者: WILEY
出版地: HOBOKEN
英文摘要: Increasing interest in global climate change has led to attempts to understand and quantify the relationship between chemical weathering processes and environmental conditions, especially climate. This interest necessitates the identification of new climate proxies for the reconstruction of two important Earth surface processes: physical erosion and chemical weathering. In this study, an AMS C-14-dated 2.8-m-long sediment core, GH09B1, from Lake Gonghai in north-central China was subjected to detailed geochemical analyses to evaluate the intensity of chemical weathering conditions in the catchment. Multivariate statistical analysis of major and trace elemental data of 139 subsamples revealed that the first principal component axis PCA1 explained approximate to 53% of the variance in the assemblage of elements/oxides with significant positive correlations between PCA1 scores and the separation of mobile and soluble elements/oxides from the immobile and resistant elements/oxides, which is thus able to indicate the chemical weathering in the catchment. These results are supported by the down-core trends of other major and trace elemental ratios of chemical weathering intensity as well as by pollen data from the same core. Variations in PCA1, chemical index of alteration (CIA), Rb/Sr ratio and other oxides ratios indicate stronger chemical weathering due to a wet climate during the Medieval Warm Period (MWP). However, the MWP was interrupted by an interval of relatively weaker chemical weathering conditions from AD 940-1070. Weak chemical weathering under a dry climate occurred during the Little Ice Age (LIA), and increased chemical weathering intensity during the Current Warm Period (CWP). Our proxy records of chemical weathering over the last millennium correlate well with the available proxy records of precipitation from Gonghai Lake as well as with the speleothem oxygen isotope record from Wanxiang Cave, but do not show a significant correlation with the temperature record in N China, suggesting that the chemical weathering intensity in the study area was mainly controlled by the amount of rainfall rather than by temperature. We conclude that high resolution lacustrine sediment geochemical parameters can be used as reliable proxies for climate variations at centennial-decadal time scales.
作者部门: [Liu, Jianbao ; Chen, Jianhui ; Wang, Zongli ; Chen, Fahu] Lanzhou Univ, Res Sch Arid Environm & Climate Change, Key Lab Western Chinas Environm Syst, Minist Educ, Lanzhou 730000, Peoples R China ; [Selvaraj, Kandasamy] Xiamen Univ, State Key Lab Marine Environm Sci, Xiamen 361005, Peoples R China ; [Xu, Qinghai] Hebei Normal Univ, Coll Resources & Environm, Shijiazhuang 050016, Peoples R China
通讯作者: Chen, JH (reprint author), Lanzhou Univ, Res Sch Arid Environm & Climate Change, Key Lab Western Chinas Environm Syst, Minist Educ, Lanzhou 730000, Peoples R China.
学科分类: Physical Geography; Geology
文章类型: Article
所属项目编号: National Basic Research Program of China [2012CB955301, 2010CB950202] ; National Natural Science Foundation of China [41130102, 41001114] ; Specialized Research Fund for the Doctoral Program of Higher Education [20120211130001] ; Fundamental Research Funds for the Central Universities [lzujbky-2013-244]
所属项目名称: 国家自然科学基金项目 ; 国家重点基础研究发展计划以及国家重大科学研究计划(973计划) ; 高等学校博士学科点专项科研基金 ; 中央高校基本科研业务费专项资金
项目资助者: NSFC ; MOST ; MOE ; LZU
语种: 英语
DOI: 10.1111/bor.12072
ISSN号: 0300-9483
WOS记录号: WOS:000342220000011
BIOSIS记录号: BIOSIS:PREV201400727806
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内容类型: 期刊论文
URI标识: http://ir.lzu.edu.cn/handle/262010/120492
Appears in Collections:资源环境学院_期刊论文

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Recommended Citation:
Liu, JB,Chen, JH,Selvaraj, K,et al. Chemical weathering over the last 1200 years recorded in the sediments of Gonghai Lake, Lvliang Mountains, North China: a high-resolution proxy of past climate[J]. BOREAS,2014,43(4):914-923.
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