梧州“6.15”强对流暴雨过程技术分析     

古鸣  欧坚莲  黎建春  覃彦英 《气象研究与应用》2011,32(2):18-20,25,117

利用现有预报业务中使用的各种常规、新型观(探)测资料,对2010年6月13～16日广西梧州市出现的连续暴雨天气过程,特别是15日梧州北部强对流大暴雨天气过程成因及预报技术难点等分析,结果表明:强对流暴雨主要由一个中尺度雨团在梧州北部附近活动而造成,冷空气与低层切变辐合配合使得强回波带在梧州北部近似静止,是造成此次强降水的主要原因;中小尺度系统分析判断为降水落区和预警预报起到关键作用。  相似文献   

气象行政许可法律文书自动化制作捷径   总被引：1，自引：1，他引：0  

符永兴  古秋红 《气象研究与应用》2011,32(2):103-104,110

通过运用EXCEL作为用户界面和数据库,使用WORD做法律文书模板,应用WORD的邮件合并功能,结合WORD的域设计,实现了气象行政许可法律文书自动化制作捷径,为提高气象工作办公效率提供了一种参考。  相似文献   

汶川大地震前后GPS观测的精密单历元解得到的震区地壳运动          下载免费PDF全文

顾国华  孟国杰  方颖 《地震学报》2011,33(3):319-326

利用BERNESE软件的单历元观测值双差定位功能,获取了接近2008年5月12日汶川Ms8.0大地震震中5个GPS观测站(PIXI,CHDU,JYAN,NEIJ和LUZH站)震前的短临位移过程及震后短时间的位移.通过拟合和对比分析,讨论了单历元解的精度.计算结果表明,以YANC站为固定站,LUZH站震前5月9日N(南北...  相似文献   

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潘国荣  谷川 《大地测量与地球动力学》2007,27(4):47-50

??????μ?????????????????????????С??????????????????????С???????????????μ??????????????????????????????????ó????????б????ó?????:С??????????????μ??????????????????????Ч????  相似文献   

规范档案管理为地勘经济发展服务     

崔国钧  顾伟  李志民 《山东国土资源》2007,23(6):2007/3/22-2007/6/8

档案管理工作是基础管理工作的重要组成部分。档案管理的科学、规范与否，体现了单位管理工作的水平。同时，对于提高管理效能具有十分重要的意义。近年来，山东省地矿工程勘察院在上级主管机关的正确领导下不断强化档案管理工作，严格档案管理程序，逐步使档案管理工作走上了规范化、科学化、制度化的管理轨道。  相似文献   

Abyssal Circulation in the Philippine Sea     

Fangguo Zhai  Yanzhen Gu 《中国海洋大学学报(英文版)》2020,19(2):249-262

The abyssal circulation in the Philippine Sea(PS)is investigated,with outputs from the Simple Ocean Data Assimilation version 2.2.4(SODA224).The deep-water currents in SODA224 are carefully evaluated,with sparse in situ observations in the North Pacific Ocean.In the upper deep layer(20003000 m)of the PS,a strong westward current,which originates from the Northeast Pacific Basin and enters the PS through the Yap-Mariana Junction,exists along 1114 N.This strong westward current bifurcates into two western boundary currents off the Philippines.The northward-flowing current flows out of the PS around 2021 N,whereas the southward-flowing current transports deep water from the northern hemisphere to the southern hemisphere.In the lower deep layer(30004500 m),the inflow water first flows northward to the east of the Western Mariana Basin and then turns westward at approximately 18 N.The inflow water mainly enters the Philippine Basin(PB),with a small part turning southward to constitute a weak cyclonic circulation.The water entering the PB mainly merges into a strong southward western boundary current in the south-ern PB.In the bottom layer(below 4500 m),both the northeast and northwest PB show single cyclonic gyres,whereas the south PB shows a single anticyclonic gyre.Moreover,comparisons with the observations indicate the possible existence of a cyclonic sense of circulation over the Philippine Trench.The current study provides the implications for future observations,which are needed to fur-ther investigate the temporospatial variations of the abyssal circulation in the PS on multiple scales.  相似文献   

Point-line-area-volume index system of land subsidence and application in Ningbo,China     

Wang  Jianxiu  Gu  Xueying  Jiang  Yukun  Huang  Tianrong  Feng  Bo 《Natural Hazards》2013,69(3):2197-2214

Natural Hazards - Traditional land subsidence indices primarily describe the characteristics of land subsidence at a given site, but such indicators cannot satisfy the requirements for effective...  相似文献   

地面高精度磁测基点联测与数据拼接方法     

李明贵  薛胜利  杨渊  张利明  谷开拓 《陕西地质》2013,(2):71-75

本文对地面高精度中同年度使用同一基点、同年度使用不同基点、不同年度使用同一基点和不同年度使用不同基点等四种情况进行了讨论,提出了解决办法,并通过实例进行对比,最后对问题进行了归纳和总结.  相似文献   

Composition and geochronology of the deep-seated xenoliths from the southeastern margin of the North China Craton     

Yi-Can Liu  An-Dong Wang  Shu-Guang Li  F. Rolfo  Yuan Li  C. Groppo  Xiao-Feng Gu  Zhen-Hui Hou 《Gondwana Research》2013,23(3):1021-1039

A variety of deep-seated xenoliths occur within the Mesozoic Jiagou dioritic porphyry in the southeastern margin of the North China Craton (NCC). In this study we present a combined petrologic, geochronological, Hf isotope and geochemical study on the different types of xenoliths and use these data to better constrain the composition and age of the deep crust beneath the area. Most of the xenoliths are mafic meta-igneous rocks, among which garnet-bearing lithologies are common. The xenoliths can be classified into three broad petrographic groups: spinel-bearing garnet clinopyroxenite/phlogopite clinopyroxenite/spinel pyroxenite (Group 1), garnet amphibolite or hornblendite/garnet granulite/mafic gneiss lacking pyroxene (Group 2), and garnet-bearing felsic (intermediate-acid) gneiss (Group 3). Among these, the mafic–ultramafic rocks constitute the dominant category. The protoliths of the studied xenoliths range from basalt through andesite to dacite. Geochemical and Hf-isotope data indicate that most xenoliths belonging to Groups 2 and 3 resemble magmatic rocks formed at convergent continental margin arc setting. A few of them (mostly belonging to Group 1) represent mantle-derived products. Multiple metasomatic imprints, with contribution from subduction-related or mantle-derived fluids or melts have been recognized from the multistage mineral assemblages and ages.SHRIMP zircon U–Pb dating, Hf isotope and geochemical data offer evidence for subduction-related adakite-like and arc-related rocks in the southeastern margin of the NCC at ca. 2.5 Ga and 2.1 Ga, and confirm the occurrence of high-pressure granulite-facies metamorphism at ca. 1.8 Ga. These data suggest an episodic growth of Precambrian lower crust beneath this region in response to two stages of subduction–accretion and one vertical accretion of mantle-derived basaltic magma at the base of the lower crust. Additionally, a previously unknown late mantle-derived basaltic magmatism at 393 ± 7 Ma has also been recognized. The data presented in this paper demonstrate that the deep crust beneath the southeastern margin of the NCC is composed of hybrid protoliths derived from Paleozoic, Paleoproterozoic and late Neoarchean sources.  相似文献   

Preparation of Four Chromium Ore Reference Materials     

Zhizhong Cheng  Hongku Huang  Mei Liu  Tiexin Gu  Weidong Yan  Mingcai Yan 《Geostandards and Geoanalytical Research》2013,37(1):95-101

The preparation and characterisation of four chromium ore reference materials are described in this paper. The sample material for GCr‐1, GCr‐3 and GCr‐4 was collected from chromite deposits in Tibet, Qinghai province and Inner Mongolia. GCr‐2 is a composite sample from GCr‐1 and GCr‐4. Sample homogeneity was tested by WD‐XRF and the relative standard deviations were < 1.0%. An F‐test showed that all four materials were homogeneous. Thirteen laboratories involved in the inter‐laboratory programme provided 672 determinations (eighteen oxides and elements). Sixteen components were characterised as certified values, of which Cr₂O₃ ranged from 17.59 to 57.80% m/m. The contents of FeO and CO₂ were taken as reference values.  相似文献