安徽暴雨落区与一些物理量关系的统计分析   总被引：5，自引：0，他引：5  

任敏  陈焱  璩英 《气象》2006,32(4):40-44

从概率统计的思路出发，用1994-2003年的降水资料对安徽省夏半年（4—9月）暴雨落区、频数等与5840gpm线的关系进行了统计分析，并用2003年淮河洪涝期间20个暴雨区域与某些实况物理量场对比，分析了暴雨落区与一些物理量分布的关系，表明了安徽省暴雨主要集中在梅雨期到7月份，暴雨日数多寡和暴雨范围大小，基本上主导汛期降水多少和旱涝趋势。暴雨落区集中出现在5820～5840gpm的区域，而〈5750gpm和〉5870gpm的区域很少出现暴雨。因此梅雨期主雨带位置预报大致可以用5840gpm线的移动作参考。在物理量上，西风急流北侧以及500hPa上升运动中心南侧到850hPa上升运动中心北侧，有利于暴雨发生发展。  相似文献   

基于DVB-S数据共享平台的NOAA/ATOVS资料获取、处理与显示系统          下载免费PDF全文

冉茂农  瞿建华  沙利  袁晚平  张凤英  吴雪宝 《应用气象学报》2006,17(4):502-507,i0002

充分利用国家科技部大力推行的DVB-S共享数据平台,加强气象卫星遥感数据的广泛应用,特别是发挥卫星垂直探测器(ATOVS)资料在我国数值天气预报以及监测重大灾害性天气系统中的作用。该文介绍了基于DVB-S系统的NOAA/ATOVS资料的处理、分析与显示系统的概况及主要功能,并以2005年7月人们关注的台风“海棠”为个例,展示了利用该系统在监测和分析台风或强对流天气时的独特优势。该系统的建立,将解决省、地气象部门不能实时获取ATOVS资料的问题,并将推动ATOVS资料在气象以及相关部门的实际应用。  相似文献   

2003年淮河流域致洪暴雨的环流演变   总被引：2，自引：6，他引：2  

陈晓红  冯皖平  璩瑛 《气象科学》2006,26(2):192-196

使用EC模式的格点高度场和风场资料,分析2003年6~7月欧亚地区环流形势演变特征与安徽淮河流域致洪暴雨的关系发现:淮河流域的强降雨能持续14 d之久,是500 hPa高空超长波维持2波、长波交替出现5~6波、高纬度为阻塞环流形势以及副热带高压脊长时间稳定在23~27°N偏北位置诸因子共同作用的结果。  相似文献   

The performance of the new tropical cyclone track prediction system of the China National Meteorological Center     

S. Ma  A. Qu  Y. Wang 《Meteorology and Atmospheric Physics》2007,97(1-4):29-39

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Geochemical characteristics of crude oils from Well Zheng-1 in the Junggar Basin, Xinjiang, China     

李志明  张长江  秦建中  张渠  范明  刘文斌  张志荣 《中国地球化学学报》2007,26(2):163-169

Well Zheng-1 is located in the combined area of the central uplift and the north Tianshan piedmont depression in the Junggar Basin. Two oil-bearing beds are recognized at 4788–4797 m of the Lower Cretaceous Tugulu Formation (K1tg) and 4808.5–4812.5 m of the Lower Jurassic Sangonghe Formation (J1s). The geochemical characteristics of family composition, carbon isotopic composition, saturated hydrocarbons, sterane and terpane biomarkers and carotane of two crude oils are described in this paper. The results show that the geochemical characteristics of the two crude oils are basically similar to each other, indicating they were all derived mainly from the high mature, brine, algae-rich lake facies sediments. Oil-source correlation revealed that crude oils of the two beds were derived mainly from the source rocks of Permian and mixed by the oil derived from the source rocks of Jurassic and Triassic. This is consistent with the geological background with several sets of source rocks in the area studied.  相似文献   

Pulsatory characteristics of wind velocity in sand flow over typical underlying surfaces     

ZHANG KeCun  QU JianJun  ZU RuiPing & FANG HaiYan Key Laboratory of Desert  Desertification  Cold  Arid Regions Environmental  Engineering Research Institute  Chinese Academy of Sciences  Lanzhou  China 《中国科学D辑(英文版)》2007,50(2):247-253

Pulsatory characteristics of wind velocity in sand flow over Gobi and mobile sand surface have been investigated experimentally in the wind tunnel. The primary goal of this paper is to reveal the relation- ship between pulsatory characteristics of instantaneous wind speed in sand flow and the motion state of sand grains. For a given underlying surface, pulsation of wind velocities in sand flow on different heights has a good correlation. As the space distance among different heights increases, fluctuation of instantaneous wind speed presents a decreasing trend and its amplitude is closely related to the mo- tion state of sand grains and their transport. Pulsatory intensity increases with the indicated wind speed, but its relative value does not depend on it, only agrees with height.  相似文献   

中国大陆中强以上地震余震分布尺度的统计特征   总被引：10，自引：0，他引：10       下载免费PDF全文

蒋海昆  郑建常  吴琼  曲延军  李永莉  代磊 《地震学报》2007,29(2):151-164

依据1970年以来记录相对完备的MSge;5.0地震序列资料，统计研究了中国大陆余震分布尺度与序列最大地震震级M0及最大地震破裂形式之间的关系. 在95%置信概率下，考虑主震破裂形式， 分序列类型给出了余震分布尺度与M0之间的统计关系. 定性而言，余震分布尺度的对数lgR与M0正相关， 但数据分布较为离散. 分类型来看， 孤立型序列余震分布尺度与M0之间统计相关程度低， 余震分布尺度介于5~60 km之间； 主余型序列lgR与M0正相关； 多震型序列当M0le;6.2时lgR与M0之间相关性不显著，余震分布尺度介于5~70 km之间， 当M0ge;6.3时lgR与M0线性相关. 统计结果还表明， 走滑近走滑及斜滑型主震所导致序列类型比例之间没有显著差异，而倾滑近倾滑型主震（主要为逆断型破裂）所导致的主余型序列所占比例较高， 孤立型及多震型序列所占比例则相对较低. 对比研究显示， 当M0较高时，余震分布尺度主要取决于主震大小而与主震破裂形式关系不明显.   相似文献   

凯里-麻江地区油苗与固体沥青的油源分析   总被引：15，自引：0，他引：15       下载免费PDF全文

张渠腾格尔  张志荣秦建中 《地质学报》2007,81(8):1118-1124

对黔南坳陷典型古油藏、残余油气藏的精细解剖对南方海相碳酸盐岩层系油气勘探研究具有重要意义。本文运用碳同位素、饱和烃色谱、饱和烃色质及芳烃色质等技术,对黔东南地区二叠系—寒武系油苗与固体沥青进行了地球化学特征研究和油源分析。研究表明,凯里地区虎庄47井原油、洛棉志留系砂岩油苗和麻江地区奥陶系红花园组固体沥青三者同源,主要来自下寒武统牛蹄塘组的优质烃源岩。而麻江地区早二叠世茅口组油苗与虎庄47井原油明显不同,主要源于下二叠统栖霞组的优质烃源岩。  相似文献   

Secondary hydrocarbon generation potential from heavy oil, oil sand and solid bitumen during the artificial maturation   总被引：1，自引：0，他引：1  

Qu Zhang  Haiping Huang  Lunjun Zheng  Jianzhong Qin 《Organic Geochemistry》2007,38(12):2024-2035

Secondary hydrocarbon generation potentials from natural bitumen, oil sand and heavy oil, representing different residual oil accumulations, were determined by artificial maturation in a closed pyrolysis system. Simulated results indicate that their thermal behavior and reactivity are similar to those of kerogen, and that they can generate hydrocarbons once subjected to suitable geological processes. Overall differences in oil and gas generation potentials among the samples result from differences in the chemical structure of precursor components, physical compaction status, and mineral matrices. Hydrogen rich precursors, such as oil sand and heavy oil, have greater potential to generate hydrocarbons than hydrogen poor ones. Naturally compacted oil sand has slightly higher conversion efficiency than artificially compacted heavy oil as indicated by lower residual bitumen content. However, total gas and liquid oil recovery from oil sand is lower than from heavy oil due to the poor release of pyrolytic products from well compacted and cemented networks in the experiments. Mineral matrices of previous oil deposits also affect further hydrocarbon generation potential. Carbonate matrices inhibit total oil and gas generation, which consequently retains high gas potential at the postmature stage. Traditional oil generation models mainly consider the thermal alteration of kerogen; this study provides supplemental information for superimposed basins where previous oil accumulations may have been destroyed and reburied to serve as secondary sources of oil and gas. Consideration of previous oil residues as potential source rock allows better estimates of available oil resources and the risks associated with their exploration.  相似文献   

郭家岭岩体矿物包裹体研究     

王海芹  曲晓明  王鹤年 《山东国土资源》1998,(2)

通过对胶东金成矿区郭家岭岩体中熔融包裹体、含石盐子晶包裹体、ＣＯ２三相包裹体和Ｈ２Ｏ两相包裹体的显微测温,结果表明,该岩体在岩浆结晶晚期发生过高盐度流体与硅酸盐熔体的不混熔过程。根据熔融包裹体均一温度与均一过程的时间,利用相应公式,计算出郭家岭岩体包裹体熔体的粘度和含水量,认为该岩体是从一种高温高粘度的岩浆中结晶成岩的。  相似文献