欢迎您！东篱公司
退出
-
申报数据库
-
立项数据库
-
成果数据库
-
项目获奖数据库
中文摘要：
通过化学氧化方法提取沉积物中元素碳物质，采用拉曼光谱对其进行分析鉴定，实验结果表明：元素碳是介于单晶石墨碳和无定形碳之间的一系列物质，是一种操作上的定义；化学氧化法提取沉积物中元素碳是可靠的，控制好氧化条件和时问，则能有效去除有机碳，保留元素碳成份。鉴于目前不同工作者由于不同的实验条件和方法下得到了不同结果，我们认为确定标准样及其浓度，统一实验方法是亟待解决的问题，进而统一这种碳微粒的名称，明确其定义，以利于相关研究的横向对比和深入。而在纵向研究方面，我们利用该实验流程提取灵台黄土剖面长时间序列黄土-古土壤样的元素碳，并进行元素碳含量的测定，结果表明元素碳记录能有效揭示占气候环境变化。在不同时间尺度上，元素碳记录有不同的气候指示意义，并且与其他气候环境指标能进行较好的对比，元素碳记录为占气候环境变化提供一新的指标。
英文摘要：
Elemental carbon was extracted from sediment by chemical oxidation and identified by Raman spectroscopy. The experimental results indicate that elemental carbon is defined by processing, which is a continuum from single crystal graphite to amorphous carbon. Chemical oxidation is a feasible method to extract elemental carbon from sediment and it can remove organic carbon and remain elemental carbon through controlling experimental condition and time. We think that the determination of standard sample and its concentration and unification of experimental method are very important because there are different results through different experimental conditions and methods. The unification and definition of all these carbon particulates are good for transect comparison and further research in relative field. In vertical secetion, elemental carbon was extracted by the same method and determination indicates that elemental carbon record can uncover paleoclimatic and environmental changes. In different timescale, elemental carbon has different implications for climate. At the same time, elemental carbon curve show a good change trend with other climatic indicators, which indicate elemental carbon can provide another new indicator for climatic and environmental changes.
同期刊论文项目
同项目期刊论文
Transitional time of oceanic to continental subduction in the Dabie orogen: Constraints from U-Pb, L
Astronomically modulated late Pliocene equatorial Pacific climate transition and northern hemisphere
Burial of organic carbon and carbonate on the inner shelf of the northern South China Sea during the
Molecular organic geochemical record of paleoenvironmental changes of core 17937 in northern south C
Extraction and identification of elemental carbon in sediment and its environmental and climatic imp
Detrital fine-grained sediment contribution from Taiwan to the northern South China Sea and its rela
Rare earth elements in bottom sediments of major rivers around the Yellow Sea: implications for sedi
Reorganization of Pacific deep waters linked to middle Miocene Antarctic cryosphere expansion: a per
Garnet Lu-Hf dating of retrograde fluid activity during ultrahigh-pressure metamorphic eclogites exh
Structures of the northeasternmost South China Sea continental margin and ocean basin: geophysical c
Late quaternary variations of productivity in the western equatorial Pacific Ocean: Records from ODP
Response of pollen diversity to the climate-driven altitudinal shift of vegetation belts in the Colo
Origin of atoll garnets in eclogites and implications for the redistribution of trace elements durin
Late Quaternary clay minerals off Middle Vietnam in the western South China Sea: Implications for so
Correlations between erosions and relative uplifts from the central inversion zone of the Xihu depre
Western equatorial Pacific productivity and carbonate dissolution over the last 550 kyr: Foraminifer
Precollisional tectonics and terrain amalgamation offshore southern Taiwan: Characterizations from r
A sediment-based record of Lateglacial and Holocene environmental changes from Guangfulin, Yangtze d
Clay minerals in surface sediments of the Pearl River drainage basin and their contribution to the S
Late Quaternary aeolian dust input variability on the Chinese Loess Plateau: inferences from unmixin
Elemental carbon record of paleofire history on the Chinese Loess Plateau during the last 420 ka and
Environmental and cultural changes during the terminal Neolithic: Qingpu, Yangtze delta, eastern Chi
Wild and domesticated forms of rice ( Oryza sp.) in early agriculture at Qingpu, lower Yangtze, Chin
Climatic and tectonic controls on weathering in south China and Indochina Peninsula: Clay mineralogi
期刊信息
位置：