新疆哈密玉西银矿床特征及成因

玉西银矿床产在中元古界长城系星星峡群黑云斜长片麻岩和藓县系卡瓦布拉克群大理岩间的韧性剪切带、韧脆性破碎带中;矿体呈脉状、透镜状和似层状;矿石由辉银矿、方铅矿、闪锌矿、黄铜矿、石英和黄铁矿等４０余种矿物组成;围岩蚀变有硅化、内铁矿化和碳酸盐化;经历热液成矿期、叠加成矿期和表生成矿期。矿质源自地壳浅部和深部岩石,介质来自地壳封存水、变质水和雨水的混合水,热源主要来自地壳圈层剪切热。在同构造、中低温、中     

ASTER-GDEM数据在大兴安岭北段地貌形态分析中的应用

基于ASTER-GDEM数据,利用彩色晕染、密度分割与GIS空间统计分析技术,结合地质资料,通过地形高程(平均高程、最大高程和最小高程)、地势起伏度、典型高程剖面及流域面积-高程积分等手段,对大兴安岭北段的地貌特征进行初步分析.分析结果表明,研究区主体呈现平原(台地)与丘陵地貌,地势相对平缓,呈北北东向延伸展布,存在多期隆升,受到北北东向区域构造控制,且遭受北西向构造活动改造;高程剖面揭示研究区存在多级剥夷面(或面状地貌面),最多可划分5级,且在各段、各坡向上发育特征不一,北北东向构造对地貌演化的控制作用强于近东西向构造,其活动强度上北段明显强于中、南段;面积-高程积分分析表明研究区地貌演化处于壮年期的晚期,山体处于隆升晚期或趋于稳定阶段,但北西向构造活动,形成大量狭长的新生沟谷.     

辽西地区构造演化与盆地成因类型研究

辽宁省西部地区发育了一系列中生代小型含煤盆地。这些盆地内有广泛的油气显示,但勘探效果却不理想。本文分析了辽西地区地球动力学背景,结合地球物理勘探资料研究了辽西地区盆地构造几何学和运动学特征,探讨了辽西地区构造演化史、盆地形成机制和成因类型,并以阜新盆地为例,阐述了盆地的构造特征和圈闭类型。      

有限区域高分辨率模式的改进,发展及试验

对复杂地形条件下嵌套细网和数据模式进行了改进和发展，使之成为水平格距为５０ｋｍ，垂直分层为１１层的高分辨率模式。同时对其物理过程如积云对流参数化、边界层物理等也进行了改进，并将该模式程序优化为能在计算机工作站和微机上进行业务运行的数值预报系统。     

Numerical simulation of sea and bay breezes in a weak shear environment

Summary A numerical mesoscale model (COAMPS) is used to study some of the features associated with the evolution of the kinematic, thermodynamic, and physical structure of the Alabama sea and bay breeze circulations and convections in weak shear environments based on five cases from Medlin and Croft (1998). The general and expected features and evolution of sea and bay breeze circulations are captured by the model simulations, including horizontal and vertical wind shifts, thermal contrast between land and water surface, vertical stability over water and land, return currents and moisture increase. The relationship of the circulations to specific synoptic flow regimes and local physiographic features was investigated. The sea breeze triggered convective cells are confirmed to have a preferred location according to the flow regime and local conditions. This result can assist the forecasters in understanding the anticipated convective cell initiation and development on a given day as related to sea and bay breeze cells as well as improve the short-term forecast accuracy of the location of thunderstorm initiation based on routine observations and subsequent convective activity. If local NWS office model a selective subset of cases then they can better visualize and forecast those cases operationally.     

热电厂雷电灾害风险评估探讨与实践

针对热电厂的特殊结构,结合南京某热电厂的雷电灾害实际情况,简化风险评估模型,尝试用2006年最新发布的IEC62305-2《雷电灾害风险评估》的评估方法对电厂进行初步的雷电灾害风险评估.研究表明,雷电对热电厂系统的损害类型主要为人身伤亡、不包括人身及社会价值的财产损失和不可接受的电力供应中断.风险评估的结果显示,热电厂安装或改造外部防雷装置在经济上是非常合理的.同样,还需要在入户的架空电缆等设施上安装浪涌保护器,且经济实用.热电厂系统需要一个高效的防雷保护系统.     

西太平洋赤道海域的热量平衡

本文利用1986年11月中国科学院实验3号考察船在西太平洋赤道海域(0°～5°N,130°～150°E)考察所获得的29天辐射资料和同期取得的温、压、湿、风和探空等资料,计算了这一海域11月份的热量平衡各量值和整层气柱的加热量。结果表明:该海域是一个强热源区,其上空大气也是一个强热源区。     

淮北地区一次强风暴的弓形回波分析

2005年7月16日淮北地区发生了一次强风暴天气过程。主要使用新建成的阜阳CINRAD-SA多普勒天气雷达观测资料,辅以天气图、本站高空观测、地面观测资料,对此过程进行了综合分析。结果表明：这是一次以灾害性大风为主、有雨暴相伴随、局部还有冰雹发生的强对流天气过程。影响系统是一条中-β尺度的弓形飑线回波带。弓形回波带是由更早些时间出现的弧形的阵风锋触发而成的。中层干冷空气的侵入加强了对流云体中的下沉气流和低层出流,形成阵风锋。在如何综合应用如此丰富的雷达产品做好临近预报方面作了初步的尝试。     

Identification and analysis of high-frequency oscillations in the eyewalls of tropical cyclones

High-frequency oscillations, with periods of about 2 hours, are first identified by applying wavelet analysis to observed minutely wind speeds around the eye and eyewall of tropical cyclones(TCs). Analysis of a model simulation of Typhoon Hagupit(2008) shows that the oscillations also occur in the TC intensity, vertical motion, convergence activity and air density around the eyewall. Sequences of oscillations in these variables follow a certain order.     

Influence of coastal wind on surface ozone and nitrogen oxides in suburban Shanghai

Surface ozone, NO, NO₂, and NO _x were measured at a coastal site (Shihua) and a nearby inland site (Zhujing) in suburban Shanghai for the whole year of 2009. More days with ozone pollution in a longer time range were observed at the coastal site than the inland site. The diurnal variations of NO _x concentrations were obviously higher at Zhujing station, while those of ozone concentrations were higher at Shihua station, indicating their different air pollution conditions. Coastal wind has significant influence on the levels and characteristics of the air pollutants. The ozone concentrations during maritime winds (MW) were much higher than those during continental winds (CW) at each of the site, while the NO and NO₂ concentrations were both opposite. The ozone concentrations at Shihua station were much higher than those at Zhujing station, while the NO and NO₂ concentrations were both opposite. The ozone concentrations at both of the two sites showed a distinct “weekend effects” and “weekdays effects” patterns during CW and MW, respectively. Correlation analysis of the pollutants showed that, the compounds during MW were more age than those during CW, and the compounds at Shihua were more age than those at Zhujing. The air pollutions at both of the two sites are mainly associated with the pollutants emitted in this region instead of long range transport.