全球海气耦合模式系统(NIM/COAMS)Ⅱ.年际变化的模拟   总被引：1，自引：1，他引：1  

闵锦忠  孙照渤  高庆九  邓自旺 《南京气象学院学报》2005,28(6):721-729

利用文献[1]建立的全球海气耦合模式系统（NIM／COAMS），对模式的年际变化模拟能力进行了检验。50a积分显示，模式模拟出了大气和海洋界面的主要年际变率，能真实地模拟热带太平洋ENSO循环的主要特征，较好地再现了ENSO循环的过程，循环周期在3—5a之间，与实际观测值一致，同时模式也较好地反映了大气和海洋的耦合特征，对年际变化有较强的模拟能力，这与FRAC耦合方案设计有关，该方法能避免气候场的牵制作用，增强模式对年际变化的模拟能力。  相似文献   

Simulation of CO2 and latent heat fluxes in the North China Plain     

Zhang Yongqiang  YU Qiang  LIU Changming  WANG Jing 《中国科学D辑(英文版)》2005,48(Z1)

We constructed a coupled model for simulating plant photosynthesis and evapotranspiration (CPCEM). In the model, non-rectangular hyperbola is used to simulate leaf photosynthesis rate that is scaled up to estimate canopy gross photosynthesis rate by an integral method. Whole canopy in the model is separated into multi-layers, each of which is divided into sunlit leaves and shade leaves. Canopy net photosynthesis rate is expressed as a function of canopy conductance which is coupled with evapotranspiration. Included the coupled function,evapotranspiration is estimated with a two-layer submodel. The main features of CPCEM are: (1)easy suitability, (2) good physiological base, and (3) simple calculation procedure. Simulated results of CPCEM were compared with those by an eddy covariance system that was installed in a winter wheat farmland of the North China Plain. CPCEM gave a quite well diurnal and seasonal dynamics of net ecosystem exchange, compared with the measurements. The root mean square error between simulation and measurements was only about 2.94 μ mol m-2 s-1. Diurnal and seasonal patterns of latent heat flux with the CPCEM were similar to those of measurements.Whereas, simulated latent heat flux was evidently higher than the measured.  相似文献   

多接收器等离子体质谱精确测定铼含量及其同位素丰度   总被引：5，自引：2，他引：5  

梁细荣　李杰漆亮  马金龙 《岩矿测试》2005,24(1):1-6

利用多接收器等离子体质谱建立了快速精确测定铼含量及其同位素丰度的方法。溶液中加入铱元素进行铼同位素的质量分馏校正,在常规的溶液雾化进样条件下,采用同位素稀释法可准确测定纳克级的铼含量。铼标样A的自然同位素丰度的测量结果为185Re(37.437±0.008)%、187Re(62.563±0.008)%(2σ,n=5);铼稀释剂的同位素丰度测量结果为185Re(5.576±0.018)%、187Re(94.424±0.018)%(2σ,n=7);与未进行分馏校正的同位素组成的测量结果相比,精度和准确度均有提高。利用同位素稀释法测得铼标样A的浓度为(516.48±0.35)ng/g(2σ,n=5);测量精度和准确度均优于0.10%;利用反同位素稀释法对铼稀释剂B进行了详细的测量,平均测量结果为(62.74±0.26)ng/g(2σ,n=15),在分析误差范围内与其标定值完全一致;与未进行分馏校正的浓度测量结果相比,铼同位素丰度及铼含量的测量准确度均明显提高。  相似文献   

Intraseasonal Variability of the Summer Monsoon over the North Indian Ocean as Revealed by the BOBMEX and ARMEX Field Programs     

P. Sanjeeva Rao  D. R. Sikka 《Pure and Applied Geophysics》2005,162(8-9):1481-1510

During the summer monsoon season over India a range of intraseasonal modulations of the monsoon rains occur due to genesis of weather disturbances over the Bay of Bengal (BOB) and the east Arabian Sea. The amplitudes of the fluctuations in the surface state of the ocean (sea-surface temperature and salinity) and atmosphere are quite large due to these monsoonal modulations on the intraseasonal scale as shown by the data collected during the field programs under Bay of Bengal Monsoon Experiment (BOBMEX) and Arabian Sea Monsoon Experiments (ARMEX). The focus of BOBMEX was to understand the role of ocean-atmospheric processes in organizing convection over the BOB on intra-seasonal scale. ARMEX-I was aimed at understanding the coupled processes in the development of deep convection off the West Coast of India. ARMEX-II was focused on the formation of the mini-warm pool across the southeast Arabian Sea in April-May and its role in the abrupt onset of the monsoon along the Southwest Coast of India and its further progress along the West Coast of India. The paper attempts to integrate the results of the observational studies and brings out an important finding that atmospheric instability is prominently responsible for convective organization whereas the upper ocean parameters regulate the episodes of the intraseasonal oscillations.  相似文献   

电感耦合等离子体原子发射全谱直读光谱仪测定地质样品中的钽   总被引：1，自引：2，他引：1  

黄兴华赵继宏  刘江斌刘建军马旻  冯春红 《岩矿测试》2005,24(2):151-153

采用电感耦合等离子体原子发射全谱直读光谱仪,以HF-HNO3-HClO4-HCl溶样,不经分离富集,直接测定地质样品(岩石、水系沉积物、土壤)中Ta。方法检出限可达0. 8μg/g。通过国家一级标准物质测试和其他样品以不同方法测定相比较,测定结果基本一致;GBW 07309标准物质6次测定的相对标准偏差(RSD)为12. 0%。  相似文献   

清水隧道围岩稳定性流固耦合研究     

赵建宇 《岩土工程技术》2007,21(5):257-260,264

研究隧道稳定性时,水对隧道的影响有时起到很重要的作用。对隧道进行安全稳定计算时应当把水的作用考虑进去,进行流固耦合分析,这样才能与工程实际情况相吻合。以清水隧道为研究背景,进行了隧道流固耦合的研究分析,分析了不同工况条件下隧道的稳定性,计算结果与现场工程实际状况吻合较好。  相似文献   

A locally conservative finite element framework for the simulation of coupled flow and reservoir geomechanics     

Birendra Jha  Ruben Juanes 《Acta Geotechnica》2007,2(3):139-153

In this paper, we present a computational framework for the simulation of coupled flow and reservoir geomechanics. The physical model is restricted to Biot’s theory of single-phase flow and linear poroelasticity, but is sufficiently general to be extended to multiphase flow problems and inelastic behavior. The distinctive technical aspects of our approach are: (1) the space discretization of the equations. The unknown variables are the pressure, the fluid velocity, and the rock displacements. We recognize that these variables are of very different nature, and need to be discretized differently. We propose a mixed finite element space discretization, which is stable, convergent, locally mass conservative, and employs a single computational grid. To ensure stability and robustness, we perform an implicit time integration of the fluid flow equations. (2) The strategies for the solution of the coupled system. We compare different solution strategies, including the fully coupled approach, the usual (conditionally stable) iteratively coupled approach, and a less common unconditionally stable sequential scheme. We show that the latter scheme corresponds to a modified block Jacobi method, which also enjoys improved convergence properties. This computational model has been implemented in an object-oriented reservoir simulator, whose modular design allows for further extensions and enhancements. We show several representative numerical simulations that illustrate the effectiveness of the approach.  相似文献   

封闭酸溶-等离子体质谱法分析超细粒度地质样品中42个元素   总被引：1，自引：3，他引：1  

孙德忠  何红蓼 《岩矿测试》2007,26(1):21-25

采用封闭压力酸溶，电感耦合等离子体质谱法（ICP—MS）测定了超细样品的42个元素，研究了样品的粒度、分解条件、取样量对分析准确度和精密度的影响。结果表明，用超细粉碎样品（〈30μm），取样量减小至2mg仍能保证取样代表性，总用酸量可减至0．5mL，反应时间也可大大缩短。采用超细样品可更好地发挥ICP—MS技术高灵敏度的效能，从而达到保护环境、降低分析成本、提高分析效率的目的。  相似文献   

锍镍试金富集-等离子体质谱法测定西太平洋富钴结壳中的铂族元素   总被引：6，自引：9，他引：6  

石贵勇  孙晓明  屈文俊  薛婷  张美  熊德信  王生伟 《岩矿测试》2007,26(2):113-116

根据西太平洋麦哲伦海山富钴板状结壳样品的成分特征，对常规的锍镍试金配方作了改进；酌情减少捕集剂羰基镍的加入量，可显著降低铂族元素的空白值。富集后的样品，采用电感耦合等离子体质谱测定铂族元素（PGE）。其中，Ru、Rh、Pd、Ir和Pt用常规外标法测定，^175Lu作内标；Os用同位素稀释法测定。用国家一级标准物质GBW07290和GBW07291作监控分析质量的参考样，结果满足要求。  相似文献   

中条山与皖南地区古铜矿冶炼产物的比较分析     

罗武干 秦颍王昌燧  魏国锋席增仁 《岩矿测试》2007,26(3):209-212

利用等离子体原子发射光谱法等现代分析测试技术，对采自中条山地区多个古铜矿冶炼遗址的冶炼产物进行了测试分析。结果表明，与同类硫化铜矿床相比，其显著特征为元素Se、Te、Bi、Sb、As、Ag、Hg、Au含量较低，甚至极低，且元素含量比值埘（Se）／w（Te）较高，w（Co）／w（Ni）很高。这些特征应可作为该地区古铜矿7台炼产物区别于皖南地区古铜矿的判别依据。研究发现。中条山炼渣的稀土配分曲线与中条山原生硫化铜矿的稀土配分曲线很相近，但不同于其氧化铜矿；从原生硫化矿→半氧化矿→氧化矿，部分微量元素似乎有一个逐步流失的规律。  相似文献