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1.
Seasonal variability of salinity budget and water exchange in the northern Indian Ocean from HYCOM assimilation 总被引：3，自引：0，他引：3
Based on HYbrid Coordinate Ocean Model (HYCOM) assimilation and observations, we analyzed seasonal variability of the salinity budget in the southeastern Arabian Sea (AS) and the southern part of the Bay of Bengal (BOB), as well as water exchange between the two basins. Results show that fresh water flux cannot explain salinity changes in salinity budget of both regions. Oceanic advection decreases salinity in the southeastern AS during the winter monsoon season and increases salinity in the southern BOB during the summer monsoon season. In winter, the Northeast Monsoon Current (NMC) carries fresher water from the BOB westward into the southern AS; this westward advection is confined to 4°-6°N and the upper 180 m south of the Indian peninsula. Part of the less saline water then turns northward, decreasing salinity in the southeastern AS. In summer, the Southwest Monsoon Current (SMC) advects high-salinity water from the AS eastward into the BOB, increasing salinity along its path. This eastward advection of high-salinity water south of the India Peninsula extends southward to 2°N, and the layer becomes shallower than in winter. In addition to the monsoon current, the salinity difference between the two basins is important for salinity advection. 相似文献
2.
何安明 《地球科学与环境学报》1989,(4)
本文采用耗散结构理论,论述了斜长石环带结构的成因信息,提出了晶体生长的动力学数学模型,并指出外界能源的供给对晶体生长和构型有着重要的影响。讨论结果表明,当能量供给体系的速率超过某一临界阈值时,就会发生大范围的相干振动现象,它将引起水压等参数的周期性变化。这样,在斜长石的结晶过程中可以形成一种典型的相干结构—韵律型环带结构。 相似文献
3.
V.V. Makarov L.S. Ksendzenko V.M. Sapelkina A.A. Opanasyuk N.A. Opanasyuk E.N. Jashkova 《世界地质(英文版)》2006,9(2)
Rock mass failure on the high depth near the underground openings often has zonal character. The mechanism of this phenomenon consists in the periodical character of stresses in surrounding rock mass and developing of tensile macrocracks at the places (zones) of maximum tangentional stresses. Mathematical model of the high stressed rock mass is developed on the base of the defect media mechanics and nonequilibrium thermodynamics principals. The correspondence between the experimental research of faulted zonal structures near the high depths openings and mathematical model calculation is achieved. Relationships between the width of cracking zones and rock mass strength property have been determined. 相似文献
4.
The thermal condition anomaly of the western Pacific warm pool and its zonal displacement have very important influences on climate change in East Asia and even the whole world. However, the impact of the zonal wind anomaly over the Pacific Ocean on zonal displacement of the warm pool has not yet been analyzed based on long-term record. Therefore, it is important to study the zonal displacement of the warm pool and its response to the zonal wind anomaly over the equatorial Pacific Ocean. Based on the NCDC monthly averaged SST (sea surface temperature) data in 2°×2° grid in the Pacific Ocean from 1950 to 2000, and the NCEP/NCAR global monthly averaged 850 hPa zonal wind data from 1949 to 2000, the relationships between zonal displacements of the western Pacific warm pool and zonal wind anomalies over the tropical Pacific Ocean are analyzed in this paper. The results show that the zonal displacements are closely related to the zonal wind anomalies over the western, central and eastern equatorial Pacific Ocean. Composite analysis indicates that during ENSO events, the warm pool displacement was trigged by the zonal wind anomalies over the western equatorial Pacific Ocean in early stage and the process proceeded under the zonal wind anomalies over the central and eastern equatorial Pacific Ocean unless the wind direction changes. Therefore, in addition to the zonal wind anomaly over the western Pacific, the zonal wind anomalies over the central and eastern Pacific Ocean should be considered also in investigation the dynamical mechanisms of the zonal displacement of the warm pool. 相似文献
5.
V.V. Makarov L.S. Ksendzenko V.M. Sapelkina A.A. Opanasyuk N.A. Opanasyuk E.N. Jashkova 《东北亚地学研究》2006,9(2):168-172
Rock mass failure on the high depth near the underground openings often has zonal character. The mechanism of this phenomenon consists in the periodical character of stresses in surrounding rock mass and developing of tensile macrocracks at the places （zones） of maximum tangentional stresses. Mathematical model of the high stressed rock mass is developed on the base of the defect media mechanics and nonequilibrium thermodynamics principals. The correspondence between the experimental research of faulted zonal structures near the high depths openings and mathematical model calculation is achieved. Relationships between the width of cracking zones and rock mass strength property have been determined. 相似文献
6.
YANMin-hua DENGWei CHENPan-qin LIANGLi-qiao 《中国地理科学(英文版)》2004,14(4):320-325
The characteristics of zonal anomaly and change rule of temporal distribution of annual precipitation in the northeastern China are revealed in this paper with EOF (Empirical Orthogonal Function) and REOF (Rotated Empirical Orthogonal Function) methods and results are drawn in the standard relief maps with GIS technology for practical application. Data used in the study were obtained from 208 meteorological stations over the northeastern China from 1961 to 2001. EOF results show that the first 3 loading vectors could give entire spatial anomaly structure of annual precipitation. In the Northeast Plain including the Songneng Plain and the Liaohe Plain, there is a regional compatibility (whether wet or dry) of annual precipitation change and this precipitation pattern has occurred since the late 1980s to the present. There also exist annual precipitation patterns of wet (or dry) in south and dry (or wet) in north and wet (or dry) in east and dry (or wet) in west. REOF results display 8 principal precipitation anomaly areas by the first 8 rotated loading vectors: the west plain, the Liaodong hills, the Sanjiang Plain, the Liaoxi hills,the Changbai Mountains, the Hulun Buir Plateau, the southwest plateau and the Liaodong Peninsula. 相似文献
7.
Zonal distribution of the erosion-landslide and soil micromorphological features in purple hilly region 总被引：3，自引：0，他引：3
HEYurong LIAOChaolin XUPei ZHANGBaohua 《山地科学学报》2005,2(1):42-49
In the purple hilly region, erosions and landslides are all serious, and it is of great scientific value and practical significance to study their formation mechanism and distribution features there.In this paper, soil micromorphological methods and techniques were used to study the erosion zonal distribution in the region. The results indicated: (1)According to erosion process, the spacial distribution zones of the erosions and landslides in the purple hilly region with different solums were divided into scouring erosion zone, transport-diffusion zone, rocks and soil turbulence zone and sediment-bury zone; (2) The soil micromorphologic taxonomic feature identifying different erosion-landslide zone were found by studying the soil micromorphology of erosive zone in purple hilly region; (3) As for the erosion-landslide formation in the region, besides the external factors, the internal factors were found more important and favorable for landslide formation through the studies on the micormorphologieal features of slide soil. 相似文献
8.
嵌入专家系统思想的上海市园林绿化GIS构建 总被引：2，自引：0，他引：2
本文介绍了嵌入专家系统思想的上海市园林绿化地理信息系统,探讨了在地理信息系统中如何嵌入专家系统模块。研究表明,构建嵌入专家系统思想的地理信息系统,能提高地理信息系统的智能性. 相似文献
9.
With the horizontal Coriolis terms included in motion equations and the influence of compressibility of seawater on Brunt-Visl frequency considered, a numerical method of calculating the dispersion relation for linear internal waves, which is an improvement of Cai and Gan (1995), and hence Fliegel and Hunkins (1975), had been set up. For different models (Pacific model, Atlantic model and Arctic model), simulations using the three different methods were compared and the following conclusions were reached:(1) the influence of horizontal Coriolis terms on dispersion relation cannot be neglected and is connected with the direction of the wave celerity, the latitude, and the modes of the wave;(2) the effect of compressibility of seawater in stratification is not an important factor for the dispersion relation of linear internal wave, at least for those three models. With the improved method, the wavefunction curves for the Pacific model had also been built. 相似文献
10.
李建新 《地球信息科学学报》2000,2(1):53-59
联邦德国议会1991年决定, 议会与政府核心部门在2000年前从波恩迁回柏林 ,波恩保留联邦行政管理中心的功能。为了按时准确地规划和完成落实迁都建设工程,在柏林建设国家行政办公设施和国家工作人员生活居住设施,解决波恩地区因国家机关迁离而遭受的损失,参加建设的许多部门应用了地球信息技术。文中介绍了“柏林房地产信息系统”,“联邦议会与政府核心区建设信息系统”,“物业管理信息系统”,“波恩地区经济地理信息系统”以及地球信息技术在交通和环境管理中的应用。 相似文献
11.
二三维联动的虚拟校园设计与实现 总被引：4，自引：0，他引：4
传统的2维地理信息系统技术成熟但缺乏3维可视化和分析的能力,而目前的3维地理信息系统发展可拥有3维可视化分析能力,然而还缺少2维地理信息系统的便捷.以二三维联动为开发思路的地理信息系统能够解决这对矛盾.本文基于二三维联动GIS的设计方案,以虚拟校园设计与实现为应用实例,利用ArcEnginefAE)实现二三维联动GIS系统的开发设计,对GIS系统的开发做出了一种新的、有益的尝试. 相似文献
12.
Zonal heat advection （ZHA） plays an important role in the variability of the thermal structure in the tropical Pacific Ocean, especially in the western Pacific warm pool （WPWP）. Using the Simple Ocean Data Assimilation （SODA） Version 2.02/4 for the period 1958-2007, this paper presents a detailed analysis of the climatological and seasonal ZHA in the tropical Pacific Ocean. Climatologically, ZHA shows a zonal- band spatial pattern associated with equatorial currents and contributes to forming the irregular eastern boundary of the WPWP （EBWP）. Seasonal variation of ZHA with a positive peak from February to July is most prominent in the Nifio3.4 region, where the EBWP is located. The physical mechanism of the seasonal cycle in this region is examined. The mean advection of anomalous temperature, anomalous advection of mean temperature and eddy advection account for 31%, 51%, and 18% of the total seasonal variations, respectively. This suggests that seasonal changes of the South Equatorial Current induced by variability of the trade winds are the dominant contributor to the anomalous advection of mean temperature and hence, the seasonality of ZHA. Heat budget analysis shows that ZHA and surface heat flux make comparable contributions to the seasonal heat variation in the Nifio3.4 region, and that ZHA cools the upper ocean throughout the calendar year except in late boreal spring. The connection between ZHA and EBWP is further explored and a statistical relationship between EBWP, ZHA and surface heat flux is established based on least squares fitting. 相似文献
13.
GPS Block IIR(M)����ԭ�����Ӳ�Ԥ���о� 总被引：3，自引：0，他引：3
?????????????????￡????ú?????????GPS Block IIR??M??????????????????????о??????????GM(1??1)??AR(p)??????????1???????????????1 ns????????10??????????????10 ns??????????????ζ??????GM??1??1???????????????????????IGS(the International GPS Service for Geodynamics)??????????7 ns?????? 相似文献
14.
15.
陈俊勇 《大地测量与地球动力学》2005,25(3):1-6
介绍了国际地球自转服务局（IERS，International Earth Rotation Service）所定义的地球参考系统、大地测量常数及其实现，IERS规范（2003）中一些新的内容．特别是IERS采用国际地球参考系统2000（ITRS2000）后的一些新进展。对ITRS2000的实现,即国际地球参考框架2000（ITRF2000）的定义、主要参数、及其应满足的条件进行了研究，重点指出了它和历史上各个ITRFyy的不同、特色及其联系。 相似文献
16.
Optimal estimation of zonal velocity and transport through Luzon Strait using variational data assimilation technique 总被引：2，自引：0，他引：2
A P-vector method was optimized using variational data assimilation technique, with which the vertical structures and seasonal variations of zonal velocities and transports were investigated. The results showed that westward and eastward flowes occur in the Luzon Strait in the same period in a year. How ever thenet volume transport is westward. In the upper level (0m -- -500m), the westward flow exits in the middle and south of the Luzon Strait, and the eastward flow exits in the north. There are two centers of westward flow and one center of eastward flow. In the middle of the Luzon Strait, westward and eastward flowes appear alternately in vertical direction. The westward flow strengthens in winter and weakens in summer. The net volume transport is strong in winter (5.53 Sv) but weak in summer (0.29 Sv). Except in summer, the volume transport in the upper level accounts for more than half of the total volume transport (0m -- bottom). In summer, the net volum etransport in the upper level is eastward (1.01 Sv), but westward underneath. 相似文献
17.
As the Central Place Theory indicates, the centricity of a central city can influence the extension of its ser-vice. Since the service industry in the theory is mostly consumer services, it is worth studying the relationship betweenthe producer services and the centricity of the city in the service society with producer services becoming a more im-portant part of the service industry. The paper takes the case of the Zhujiang (Pearl) River Delta (PRD), a developedregion in China, to study the relationship between the developing level of producer services and the urban hierarchy.Based on the analysis about the spatial difference of the producer services in the nine cities of the PRD, and the divi-sion of the nine cities according to some economic indices, it is shown that there is a correlation between the develop-ing level of producer services and the urban hierarchy. Furthermore, two deductions about the future status of the pro-ducer services in the city and the location of the producer services in a large region can be made from this correlationbetween the developing level of producer services and the urban hierarchy. 相似文献
18.
ZHONG Yun YAN Xiaopei 《中国地理科学(英文版)》2008,18(1):1-8
As the Central Place Theory indicates, the centricity of a central city can influence the extension of its service. Since the service industry in the theory is mostly consumer services, it is worth studying the relationship between the producer services and the centricity of the city in the service society with producer services becoming a more important part of the service industry. The paper takes the case of the Zhujiang （Pearl） River Delta （PRD）, a developed region in China, to study the relationship between the developing level of producer services and the urban hierarchy. Based on the analysis about the spatial difference of the producer services in the nine cities of the PRD, and the division of the nine cities according to some economic indices, it is shown that there is a correlation between the developing level of producer services and the urban hierarchy. Furthermore, two deductions about the future status of the producer services in the city and the location of the producer services in a large region can be made from this correlation between the developing level of producer services and the urban hierarchy. 相似文献
19.
为了验证 PP333对花生品质的影响 ,在花生始花后 30～ 35d,用不同浓度的 PP333对花生进行叶面喷施。结果表明 ,四种浓度的 PP333都能提高花生种仁的糖、脂肪和蛋白质的含量 ,各指标物质的变化具有一致性 ,并以 10 0 mg·L-1PP333的作用效果最强 ,对糖分的影响最大 相似文献
20.
A Study of Resource Curse Effect of Chinese Provinces Based on Human Developing Index 总被引：1，自引：1，他引：0
Traditional opinion considers that natural resources play an important positive role in economic development, while resource curse theory holds that natural resources usually obstruct economic increase. This debate needs further exploration. In most of empirical studies on resource curse theory, the economic development of an area is mainly evaluated by the Gross Domestic Product （GDP）, however, the social and cultural contents of economic development are seldom considered. Thus, the Human Developing Index （HDI） was chosen to describe the comprehensive developing situation of an area in our study. Based on the panel data from the year of 2000 to 2011, the relationship between Human Developing Index and resource exploitation degree （RED） of 30 provinces in China （Tibet, Tai- wan, Hong Kong and Macao were not included because of the restriction of data acquisition） was investigated by correlation coefficient analysis and regression analysis. We found that resource curse did exist over the entire country and its effect on 30 provinces were not exactly the same. According to the effects of resource curse, these provinces could be classified into four types： no resource curse prov- inces, slight resource curse provinces, severe resource curse provinces, and extreme resource curse provinces. Testing from two short time periods 2000-2005, and 2006-2011, the resource curse effect was not prominent. However, testing from the entire period of 2000-2011, the effect was obvious among each province. 相似文献