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141.
造山型金矿的成矿作用与H20-CO2流体有着密切的联系。然而对阿尔泰山南缘和穆龙套金矿的流体包裹体研究表明,无水的CO2-CH4流体在中亚成矿域中一些金矿床中具有同样重要意义。阿尔泰山南缘萨热阔布金矿包裹体的Xch4达0.20~0.23,穆龙套金矿的XCH4为0.07~0.23。CH4扩大了流体不混溶的范围,有利于对Au的富集沉淀。CO2流体在Au成矿中的重要作用至少包括了三方面的意义,即:缓冲流体PH值范围、提高流体中的Au含量并使其维持与还原硫的络合作用进行迁移;扩大超临界流体的温度范围;增加流体不混溶的区域。CH4的加入扩大了流体不混溶的范围,有利于对Au的富集沉淀。 相似文献
142.
Nikolaus Gussone Gerald Langer Markus Geisen Blair A. Steel Ulf Riebesell 《Earth and Planetary Science Letters》2007,260(3-4):505-515
Four species of marine calcifying algae, the coccolithophores Calcidiscus leptoporus, Helicosphaera carteri, Syracosphaera pulchra and Umbilicosphaera foliosa were grown in laboratory cultures under temperatures varying between 14 and 23 °C, and one species, C. leptoporus, under varying [CO32−], ranging from 105 to 219 μmol/kg. Calcium isotope compositions of the coccoliths resemble in both absolute fractionation and temperature sensitivity previous calibrations of marine calcifying species e.g. Emiliania huxleyi (coccolithophores) and Orbulina universa (planktonic foraminifera) as well as inorganically precipitated CaCO3, but also reveal small species specific differences. In contrast to inorganically precipitated calcite, but similar to E. huxleyi and O. universa, the carbonate ion concentration of the medium has no statistically significant influence on the Ca isotope fractionation of C. leptoporus coccoliths; however, combined data of E. huxleyi and C. leptoporus indicate that the observed trends might be related to changes of the calcite saturation state of the medium. Since coccoliths constitute a significant portion of the global oceanic CaCO3 export production, the Ca isotope fractionation in these biogenic structures is important for defining the isotopic composition of the Ca sink of the ocean, one of the key parameters for modelling changes to the marine Ca budget over time. For the present ocean our results are in general agreement with the previously postulated and applied mean value of the oceanic Ca sink (Δsed) of about − 1.3‰, but the observed inter- and intra-species differences point to possible changes in Δsed through earth history, due to changing physico-chemical conditions of the ocean and shifts in floral and faunal assemblages. 相似文献
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区域气候模式RegCM3应用研究综述 总被引:11,自引:1,他引:11
回顾了区域气候模式RegCM的发展历史,并对最近推出的RegCM3模式目前的应用进展情况进行了分类总结,同时讨论了今后的研究方向和其中存在的不足。 相似文献
145.
从新一代天气雷达径向速度资料中反演出可靠的三维风场对提高新一代天气雷达的应用水平有重要的作用,将雷达直接观测的径向速度转换成台站预报员更为熟悉的风场结构,对识别中小尺度信息有很大帮助。为此该文对4DVAR同化技术在风场业务反演中应用的可能性进行了探讨,利用广州、济南新一代多普勒天气雷达观测资料,从是否加入云模式湿过程以及迭代次数、计算时间、背景场、初始场、分辨率和反演区域等方面对干模式的4DVAR系统进行了讨论,并从风场结构、均方根差别等方面对反演结果进行分析。多种试验表明,干模式的4DVAR系统与湿的云模式反演结果差异不大。模式的初始场和背景场对反演结果具有较高的敏感性,利用前一时次的反演结果作为背景场迭代15~20次的干模式结果可以很好地在业务上试运行,对台站预报员提高中小尺度天气预报的准确率有着很重要的作用。 相似文献
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The four-dimensional empirical orthogonal function (4D-EOF), which in reality is a simple combination of three-dimensional EOF (3D-EOF) and extended EOF (EEOF), is put forward in this paper to test the ability of numerical model to simulate climate and its change. The 4D-E0F analysis is able to reveal not only the horizontal characteristic pattern of analyzed variable, and its corresponding annual and inter-annual variations, but also the vertical structural characteristics. The method suggested is then used to analyze the monthly mean 100-, 500-, 70G-, and 1000-hPa geopotential height fields (4941 grids and grid spacing 60 km) and their anomaly fields in 1989-1998 simulated by the MM5V3 from the RMIP (Regional Climate Model Inter-comparison Project for East Asia)-II, as well as their counterparts (used as the observed fields) from the NCEP/NCAR re-analysis dataset in the same period. The ability of MM5V3 in simulating East Asian climate and its change is tested by comparing the 4D-EOF analysis results of the simulated and observed datasets. The comparative analyzed results show that the horizontal pattern of the first eigenvector of the observed monthly mean geopotential height fields and its vertical equivalent barotropic feature were well simulated; the simulations of the first two eigenvectors of the observed monthly mean geopotential height anomaly fields were also successful for their horizontal abnormal distributions and significant equivalent barotropic features in the vertical were well reproduced; and furthermore, the observed characteristics, such as the variation with height, the annual and inter-annual variations of the monthly mean geopotential height/anomaly fields were also well reflected in the simulation. Therefore, the 4D-EOF is able to comprehensively test numerical model's ability of simulating the climate and its change, and the simulation ability of MM5V3 for the climate and its change in East Asia in the 1990s was satisfactory. 相似文献
148.
分析了威德尔海周边雪冰和大气中MSA和nssSO2-4浓度资料。结果表明,威德尔海是造成这一地区大气中高含量生物硫化物的“源”,其周边岛屿及冰架表层雪冰记载和反映了大气中生物硫化物的空间分布和季节变化特点。源区产出硫化物的强度存在显著差异:靠近南极半岛一侧高于靠近Filchner-Ronne冰架一侧。尽管诸多因素对输运和沉降过程发生影响,表层积雪MSA和nsSO2-4浓度仍呈现出很有规律性的空间分布:随沉降地点离海距离和海拔高度的增加,浓度值递减;但在一定海拔之下,“高程效应”不显著。冰芯中MSA浓度垂向分布显示出季节分配“滞后”现象,在表层表现为受天气条件制约的输运过程造成的相位差,在深层则归因于有待验证的“迁移”机制作用的结果。大气和雪冰样品对比研究结果表明,在类似威德尔海这样的高纬地区,大气中的SO2-4和MSA“信号”在雪冰样品中会遭到不同程度的减弱。但就空间变化趋势和季节分布而言,表层雪冰仍是大气中组分(在本文是SO2-4和MSA)的良好载体。十分接近的大气和雪冰MSA对nssSO2-4(或SO2-4)比率证实,这两种大气组分在由大气洗净和沉降到冰雪过程中只发生微弱的分离作用。这也就是大气和雪冰中 相似文献
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150.