华北暴雪的云微物理参数化方案的比较模拟   总被引：7，自引：3，他引：4  

林文实  孟金平  蒙伟光  樊琦  李江南 《气象科学》2009,29(2):150-156

用MM5模式模拟2004年12月20-23日发生在华北地区的一次暴雪天气的发生发展及其演变过程.在四个嵌套网格区域内分别采用Goddard方案(试验G)和Reisner 2方案(试验R)的两个纯显式冰相云微物理参数化方案进行试验.模拟结果表明:试验G和试验R均可以较好的模拟暴雪过程中的环流形势演变、降雪分布和强度,并且两个试验的结果差别不大,但是云中的微物理过程有很大的不同.试验G的主要云微物理过程包括云水的凝结增长、云冰的凝华增长、云冰初始化、云冰被雪碰并、云水被雪碰并、雪的凝华增长、云冰的Bergeron过程等;而试验R的主要云微物理过程包括云冰的凝华增长、云冰转化成雪、雪的凝华增长和霰的凝华增长等.  相似文献   

Spatial and temporal variations in hydro-climatic variables and runoff in response to climate change in the Luanhe River basin,China   总被引：3，自引：3，他引：0  

Weiguang Wang  Jiande Wei  Quanxi Shao  Wanqiu Xing  Bin Yong  Zhongbo Yu  Xiyun Jiao 《Stochastic Environmental Research and Risk Assessment (SERRA)》2015,29(4):1117-1133

  相似文献   

Platinum-group element geochemistry of mafic rocks from the Dongchuan area,southwestern China     

Siqi Yang  Hong Zhong  Weiguang Zhu  Wenjun Hu  Zhongjie Bai 《中国地球化学学报》2017,36(1):52-65

Mafic intrusions and dykes are well preserved in the Yinmin and Lanniping districts, located within the western margin of the Yangtze Block, SW China. Although these mafic rocks from the two areas formed during different periods, they share similar ranges of PGE concentration. Most of the Yinmin gabbroic dykes contain relatively high PGE concentrations (PGEs = 13.9–87.0 ppb) and low S contents (0.003 %–0.020 %), higher than the maximum PGE concentrations of mafic magmas melting from the mantle. Two exceptional Yinmin samples are characterized by relatively low PGE (PGEs = 0.31–0.37 ppb) and high S (0.114 %–0.257 %) contents. In contrast, most samples from the Lanniping gabbroic intrusion have low PGE concentrations (PGEs = 0.12–1.02 ppb) and high S contents (0.130 %–0.360 %), except that the three samples exhibit relatively high PGE (PGEs = 16.3–34.8 ppb) and low S concentrations (0.014 %–0.070 %). All the Yinmin and Lanniping samples are characterized by the enrichment of PPGE relative to IPGE in the primitive-mantle normalized diagrams, and the high-PGE samples exhibit obvious Ru anomalies. This study suggests that during the ascent of the parental magma, removal of Os–Ir–Ru alloys and/or chromite/spinel leads to high Pd/Ir ratios and Ru anomalies for the Yinmin high-PGE samples and relatively lower Pd/Ir ratios and Ru anomalies for the Lanniping low-PGE samples. We propose that the magmas parental to the Yinmin gabbroic dykes are initially S-unsaturated, and subsequently, minor evolved magma reached sulfur saturation and led to sulfide segregation. Although the Lanniping parental magmas are originally not saturated in S, the high Cu/Pd ratios (3.8 × 10⁴ to 3.2 × 10⁶) for most of the Lanniping samples indicate the S-saturated state and sulfide segregation. A calculation shows that the PGE-poor magmas might have experienced 0.01 %–0.1 % sulfide segregation in the magma chamber. Therefore, our study provides a possible opportunity to discover PGE-enriched sulfide mineralization somewhere near or within the Lanniping mafic intrusion.  相似文献   

电力GIS数据采集系统设计与开发     

陈亮  王剑锋  单宝麟  解伟光  王炳辉 《测绘通报》2017,(1):151-153

为提高电网GIS数据采集的工作效率,保证电网GIS平台空间数据及属性数据的整体性、完整性、准确性和及时性,综合运用现代的Ntrip网络RTK技术、移动GIS技术、数据库技术和RFID识别技术,成功研发了电力GIS数据采集系统。实际工程应用表明,该系统提高了采集的工作效率,可有效满足电网GIS采集的工作需要。  相似文献   

呷村银多金属块状硫化物矿床银的赋存状态   总被引：5，自引：0，他引：5  

朱维光  李朝阳  邓海琳  张文兰  侯国富  许远平  李金忠  李静 《矿床地质》2002,21(4):399-407

通过大量岩石、矿石光（薄）片观察鉴定、电子探针分析、首次查明呷村海相火山岩型银多金属状块硫化物矿床有硫砷铜银矿和硫砷铜矿两种硫盐矿物。研究表明，除硫化物外（主要为方铅矿、闪锌矿、黄铁矿，其次为黄铜矿，毒砂，斑铜矿，铜铜银矿，螺硫银矿，磁黄铁矿等），硫盐矿物十分发育，主要有黝铜矿、车轮矿、硫砷铜矿、硫砷铜银矿等。该矿床中的银主要在喷流-沉积成矿阶段富集。  相似文献   

山西境内地电阻率异常分析     

安维光 《山西地震》1992,(3)

研究山西境内1974年建立地电台以来出现的ρ_s异常与台站300km内,发生的5次5.1～6.3级地震的关系。证明利用地电阻率方法预报地震的效果是好的。  相似文献   

华南沿海断块构造近期活动幅度和速率的估算   总被引：1，自引：0，他引：1  

张虎男  陈伟光 《华南地震》1992,(1)

按既定的原则对华南沿海的断块构造区进行了划分。根据可大体确定时代的构造地貌面或沉积物;已测定~(14)C年代数据的指相样品和地壳形变测量资料,分别估算了第四纪各时期以来,晚更新世晚期以来和近40a以来各断块活动的幅度和速率。尽管所得的只是平均的最小值,但在新构造研究的应用方面,仍有实际意义,这类研究也有助于理论认识的提高。  相似文献   

北斗卫星伪距偏差标定及对用户定位精度影响     

唐成盼  宿晨庚  胡小工  高为广  刘利  卢鋆  陈颖  刘成  王威  周善石 《测绘学报》1957,49(9):1131-1138

伪距偏差是指卫星导航信号非理想特征导致的不同技术状态接收机产生的伪距测量常数偏差。本文将伪距偏差作为一种用户段误差,提出基于并置接收机的伪距偏差计算方法和基于DCB参数的伪距偏差计算方法,以实现伪距偏差与其他误差的分离。然后利用实测数据测量了北斗卫星伪距偏差,结果表明伪距偏差标定序列波动STD约为0.1 m,不随时间明显变化,不同地点接收机测量的伪距偏差具有较好的一致性。在1.5 G频段,北斗卫星B1I频点伪距偏差最大。北斗卫星新体制信号B1C伪距偏差最小,较北斗卫星B1I频点伪距偏差明显改善,也明显好于GPS卫星L1C/A频点伪距偏差。在其他频段,GPS卫星L2C伪距偏差略大于北斗卫星B3I伪距偏差,L5C频点伪距偏差次之,B2a频点伪距偏差最小。最后,利用实测数据分析了伪距偏差对定位精度的影响。结果表明伪距偏差与卫星群延迟参数高度相关。若用户接收机与群延迟参数计算采用的接收机技术状态差异较大,用户接收机定位精度将明显恶化。  相似文献   

NUMERICAL SIMULATION OF A MESOSCALE CONVECTIVE SYSTEM (MCS) DURING THE FIRST RAINY SEASON OVER SOUTH CHINA^*          下载免费PDF全文

MENG Weiguang  WANG Anyu  LI Jiangnan  FONG Soikun  KU Chimeng 《Acta Meteorologica Sinica》2003,17(1):79-92

Based on the NCEP/NCAR reanalysis data and observations collected during the SCSMEX,a mesoscale convective system (MCS) occurring over South China during 23-24 May 1998 has been studied with a numerical simulation using the Fifth Generation Penn-State/NCAR Mesoseale Modeling System (MMS).The successful simulations present us some interesting findings.The simulated MCS was a kind of meso-β scale system with a life cycle of about 11 hours.It generated within a small vortex along a cold front shear line.The MCS was characterized by severe convection.The simulated maximum vertical velocity was greater than 90 cm s^-1,and the maximum divergence at about 400 hPa.The rainfall rate of MCS exceeded 20 mm h^-1.To the right of the simulated MCS,a mesoscale low-level jet (mLLJ) was found.A strong southwesterly current could also be seen to the right of MCS above the mLLJ.This strong southwesterly current might extend up to 400 hPa.A column of cyclonic vorticity extended through most part of the MCS in the vertical direction.Additionally,the simulated MCS was compared favorably with the observational data in terms of location,precipitation intensity and evolution.  相似文献   

Integrated Navigation Based on Robust Estimation Outputs of Multi-sensor Measurements and Adaptive Weights of Dynamic Model Information     

YANG Yuanxi GAO Weiguang 《地球空间信息科学学报》2005,8(3):201-204

IntroductionMulti-sensor combinationis a main tendencyinnavigation and positioning. The measurementsof the multi-sensors usually have different typesof systematic errors . The integrated navigationsystem can provide redundant information toweaken the influences of the systematic errorsand to detect the measurement outliers and thedisturbances of the kinematic model . As a re-sult ,the whole accuracy and reliability of navi-gation and positioning will be i mproved.In the application of multi-s…  相似文献