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The distribution and chemical properties of chromophoric dissolved organic matter (CDOM) in the Jiaozhou Bay, China were examined during four cruises in 2010-2011. The influence of freshwater and industrial and municipal sewage along the eastern coast of the bay was clearly evident as CDOM levels (defined as a 305 ), and dissolved organic carbon (DOC) concentrations were well correlated with salinity during all the cruises. Moreover, DOC concentrations were significantly correlated with chlorophyll a concentrations in the surface microlayer as well as in the subsurface water. The concentrations of DOC and CDOM displayed a gradually decreasing trend from the northwestern and eastern coast to the central bay, and the values and gradients of their concentrations on the eastern coast were generally higher than those on the western coast. In addition, CDOM and DOC levels were generally higher in the surface microlayer than in the subsurface water. In comparison with DOC, CDOM exhibited a greater extent of enrichment in the microlayer in each cruise, with average enrichment factor (E F ) values of 1.38 and 1.84, respectively. Four fluorescent components were identified from the surface microlayer and subsurface water samples and could be distinguished as peak A, peak T, peak B and peak M. For all the cruises, peak A levels were higher in the surface microlayer than in the subsurface water. This pattern of variation might be attributed to the terrestrial input. 相似文献
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通过光学显微镜、X射线粉晶衍射、X射线荧光光谱、电感耦合等离子体质谱、电子探针等测试分析手段对云南保山南红玛瑙的岩相学、矿物组成、化学成分等进行了系统研究,在此基础上进一步通过扫描电镜、X射线能谱元素面扫描、激光共聚焦显微拉曼分析了南红玛瑙致色矿物形貌、元素分布及矿物物相构成。研究结果表明,保山南红玛瑙主要矿物为石英(95%,质量分数),主要结构为粒状结构和纤维结构,次要矿物为斜硅石及方解石等,并含有吸附水和结构水两种状态水。致色矿物主要以小于1μm球状矿物颗粒、2~10μm絮状似球状集合体、针状矿物颗粒和不规则形态矿物集合体这4种类型存在,元素分析显示其为含铁矿物。显微拉曼进一步确认南红玛瑙的颜色是由含铁矿物所致,其中红色致色主要为赤铁矿,黄色致色主要为针铁矿,铁矿物的具体存在形式及其分布方式对南红玛瑙的价值具有决定性作用。本工作为南红玛瑙矿物学特性以及致色机理研究提供了有价值的参考信息,对完善其知识体系和推动南红玛瑙文化有重要意义,同时对借助共聚焦显微拉曼等微区表征技术推动宝玉石研究提供了新思路。 相似文献
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GPS高程数据时间序列分析 总被引：4，自引：1，他引：4
对GPS台站时间序列进行了研究，对我国IGS连续跟踪站高程分量的数据进行谱分析和小波分析，用最小二乘法将时间序列的白噪声与有色噪声分离，并利用AR模型建模。通过分析，获得拉萨、上海和武汉GPS连续跟踪站的有色噪声特征。 相似文献
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根据用GPS载波相位三差观测量进行动态定位或精密导航的需求,推导了动态噪声、观测噪声为有色噪声的抗差卡尔曼滤波公式。白噪声的抗差卡尔曼滤波是有色噪声的抗差卡尔曼滤波的特例,有色噪声的抗差卡尔曼滤波为白噪声的抗差卡尔曼滤波的推广。 相似文献
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莺歌海盆地浅层典型已知“亮点型”气藏的地球物理特征已经非常清楚,而且大部分目标都已列入储量计算的范畴,所以勘探潜力不是很大,这就要求我们应该把目光投向中层目标来寻找储量接替.但是若想准确的计算储量,就应该落实目标体的含气范围,但是由于埋深、压力及浅层目标屏蔽的影响,中层目标的地球物理特征我们还不是很清楚,更难较准确的确定含气范围.本文带着这个问题展开研究,第一步通过地震属性分析确定异常体的范围,通过反演确定砂体范围;第二步通过聚类分析确定有利砂体的范围;第三步通过叠后吸收处理判断目标体的含气性;最后,将有利砂体的范围与吸收异常的范围叠合来确定目标体的含气范围.综合应用多种地球物理方法判断目标体的含气性,总结出了一套预测中层目标含气范围的流程及方法,为较准确的落实中层目标含气范围奠定了基础. 相似文献
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由于环境,资源方面的问题,湿法冶金已成为目前冶金工业的主要发展方向之一。着重讨论了铜,镍的湿法冶炼技术,并介绍了金,银等金属的湿法冶炼,以及湿法冶金的进展。 相似文献
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首次通过2008-2009年在西北地中海和东地中海海域投放的两台Bio-Argo浮标的观测数据,分析与研究了该海区黄色物质次表层极大值的季节变化规律.研究表明次表层黄色物质在夏季开始爆发,伴随着叶绿素a浓度的逐渐降低;到冬季在强烈的垂向混合作用下结束.且黄色物质极大值的深度与叶绿素a浓度极大值(DCM)的深度基本一致,说明虽然黄色物质与浮游植物之间并不存在直接联系,但浮游植物的降解是黄色物质的主要来源.文中推测,可能由于该海区浮游植物与微生物的强耦合,导致了黄色物质与叶绿素a之间存在明显的反变关系. 相似文献
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LIU Qiong PAN Delu BAI Yan WU Kai CHEN Chen-Tung Arthur SUN Jun ZHANG Lin 《海洋学报(英文版)》2013,32(2):1-11
The retrieval of dissolved organic carbon (DOC) distribution by remote sensing is mainly based on the empirical relationship of DOC concentration and colored dissolved organic matter (CDOM) concentration in many literatures. To investigate the nature of this relationship, the distributions and mixing behaviors of DOC and CDOM are reviewed in the world’s major estuaries and bays. It is found that, generally, the CDOM concentration is well correlated with the salinity in most estuaries, while DOC usually shows a nonconservative behavior which leads to a weak correlation between the DOC concentration and the CDOM concentration. To establish a good satellite reversion of the DOC concentration, the East China Sea(ECS) was taken as an example, and the mixing behavior of DOC and CDOM as well as the influence of biogeochemical processes were analyzed except for the physical mixing process with the data from late autumn (November, 2010) and winter (December, 2009) cruises. In the two ECS cruises, the CDOM concentration was found to be tightly correlated with the salinity, influenced little by the photochemical or biological processes. The data from the winter cruise show that DOC followed a conservative mixing along the salinity gradient, while in the late autumn cruise it was significantly affected by the biological activities, resulting in a poor correlation between the DOC and the CDOM. Accordingly, an improved DOC algorithm (CSDM) was proposed: when the biological influence was significant (Chl a greater than 0.8 μg/dm3 ), DOC was retrieved by the conservative and biological model, and if the conservative mixing was dominant (Chl a less than 0.8 μg/dm3 ), the direct DOC concentration and CDOM concentration relationship was used. Based on the proposed algorithm, a reasonable DOC distribution for the ECS from satellite was obtained in this study, and the proposed method can be applied to the other large river-dominant marginal sea. 相似文献