Recent Precipitation Trends in Hungary in the Context of Larger Scale Climatic Changes   总被引：1，自引：0，他引：1  

Domonkos  Peter 《Natural Hazards》2003,29(2):255-271

The time series of monthly precipitation totals from 14 Hungarian observing stations (1901–1998) were analysed to reveal the long term changes in precipitation characteristics occurred in the 20th century. A particular attention was given to the changes in the recent decades and their links with the larger scale climatic and circulation changes over Europe and the Atlantic.The statistical significancesof systematic changes are controlled by linear trend analysis and the Mann–Kendall test. The long term fluctuations are illustrated applying a 15-point Gaussian filter on the time series. The Standardised Precipitation Index is used to evaluate the changes in the drought event frequency. The relationships with larger scale changes are mostly discussed relying on contemporary papers, and the Grosswetterlagen Catalogue is used as well.The annual precipitation total decreased by 15–20% in Hungary during the 20th century. The decline is substantial in both halves of the century, but the precipitation sums in the transition seasons declined in the first 50 years, and the winter precipitation decreased in the latest decades. The precipitation total of the period November–February declined significantly in the last 50 years. In the same time the mean winter value of the North Atlantic Oscillation Index (NAOI) increased, the positions of the main pressure patterns over the Atlantic are shifted northeastward, and lot of other coherent changes detected in the winter climate of the European–Atlantic region. The mean summer precipitation total has hardly changed, but the frequency of summer drought events increased. There are some signs of a shift of the Hungarian summer climate towards a Mediterranean like climate.  相似文献   

Copper-Polymetal Metallogenic Series and Prospecting Perspective of Eastern Section of Gangdise   总被引：1，自引：0，他引：1  

ZhengYouye XueYingxi GaoShunbao 《中国地质大学学报(英文版)》2003,14(4):349-355

Geological, geophysical, geochemical and remote sensing comprehensive studies show that big ore-prospecting potentiality is contained in the eastern section of the Gangdise Mountains, Tibet.There are various mineralization types with dominant types of porphyry and exhalation. According to their relations with tectonic evolution, they are divided into four kinds of metallogenic series as follows:magnmtic type (Cr, Pt, Cu, Ni) and exhalation type (Cu, Pb, Zn, Ag) ore deposit series related to Neo-Tethys oceanic crust subduction action (125-96 Ma); epithermai type (Au, Ag, Pb, Zn, Sb), altered fractured rock type (Cu, Mo) and skarn rock type (Cu) ore deposit series related to arc-continental collision; porphyry type (Cu, Mo), cryptoexplosion breccia type (Cu, Au, Pb, Zn), shear zone type (Au, Ag, Sb) and skarn rock type (Cu, Fe) ore deposit series with relation to post-orogenic extensional strike-slip. From subductive complex to the north, zoning appears to be crystallization differentiation type (segregation type)-shear zone type (altered rock type)-skarn rock type, epithermai type-porphyry type-porphyry type and exhalation type-exhalation type-hydrothermai filling-replacement type.The ore deposit is characterized by multi-places from the same source, parity and multi-stage, hypabyssal rock from the deep source and poly genetic compound as a whole.  相似文献   

卫星测高问题的球谐级数解法   总被引：3，自引：0，他引：3  

于锦海 《测绘学院学报》2003,20(1):7-9

研究了球界面下卫星测高问题的解法，利用有限逼近方法得到了下列结论：若陆地部分是球冠，则卫星测高问题的解可以转换成关于球谐级数位系统的线性方程组。同时证明了常用的Stokes问题、Dirichlet问题、Neumann问题可以看成卫星测高问题的特殊情况。  相似文献   

Multiresolution Flux Decomposition     

J. F. Howell  L. Mahrt 《Boundary-Layer Meteorology》1997,83(1):117-137

Geophysical variables are orthogonally decomposed by averaging timeseries using different averaging lengths, referred to as a (Haar)multiresolution decomposition. This simple and economic decomposition isassociated with cospectra that formally satisfy Reynolds averaging rules foreach averaging length. The multiresolution decomposition provides a naturalestimate of the random error in estimating a mean turbulent flux. The Fourierand multiresolution decompositions are compared using aircraft data fromBOREAS.  相似文献   

北淮阳金寨—苏仙石地区中生代花岗岩类岩石学及地球化学特征   总被引：4，自引：4，他引：4  

李家振  刘文灿 《现代地质》1997,11(1):102-110

位于大别山北麓的北淮阳金寨—苏仙石地区广泛发育花岗岩类侵入岩，同位素年龄为１４０～９７Ｍａ，时代属Ｊ３—Ｋ１。根据侵入岩的地质、岩石学和岩石地球化学特征，将本区侵入岩划分为３个超单元（包括１０个单元）和３个独立单元，分属中性岩和酸性岩两大类，岩石类型有闪长岩、二长岩和花岗岩等。根据岩石化学的判别结果，侵入岩均属亚碱性系列中的钙碱性岩石，并属于普通型和钾质型  相似文献   

先进的大地电磁资料处理和反演方法在INDEPTH-MT中的应用研究   总被引：2，自引：0，他引：2  

谭捍东  陈乐寿 《现代地质》1997,11(3):393-400

简述了包括Ｒｏｂｕｓｔ估计、阻抗张量分解、Ｒｈｏｐｌｕｓ理论、二维快速松弛反演、静位移校正等一些先进的大地电磁资料处理和反演方法的理论。结合ＩＮＤＥＰＴＨ ＭＴ实测资料例举了它们的应用效果。提供了一套处理野外资料的系统流程。  相似文献   

西藏聂拉木高喜马拉雅结晶岩系的伸展变形     

何政伟  王根厚 《世界地质》1997,16(2):1-6

西藏聂拉木高喜马拉雅结晶岩系在区域上以单一的叶理和单一的拉伸线理占主要地位，其变形带的组构主要反映了透入性的伸展变形；根据显微构造分析表明早期由北往南推覆，晚期由南向北伸展，且晚期表现非常明显。  相似文献   

豫西金银多金属矿床成矿系列及其共生组合规律   总被引：4，自引：0，他引：4  

徐孟罗  李红超  王志光  郭保健  程广国  王玉玲 《矿产与地质》1997,(2)

豫西地区金银铅多金属矿床成矿系列，包括石英脉型、构造蚀变岩型、爆破角砾岩型、层间破碎岩型、矽卡岩型和斑岩型矿床。成矿系列各类型金银铅多金属矿床为同源、同期、不同阶段、不同成矿空间的矿床产出组合。并从成矿时间、空间、产出型式和成因上论述了其成矿的共生性、分带性、过渡性、互补性、连续性和重叠性等共生组合规律，举出实例阐明研究金银铅多金属矿床成矿系列的找矿意义。  相似文献   

灰色预测模型在径流长期预报中的应用   总被引：6，自引：3，他引：6  

蓝永超  杨志怀 《中国沙漠》1997,17(1):49-52

基于灰色系统的建模理论，利用河西地区有关河流的径流观测资料，建立了一个ＧＭ（１，１）残差序列周期修正径流预测模型，并用于春旱缺水期３～６月河流来水量的长期预报，经生产部门验证，准确率在８０％以上  相似文献   

红赐堡—黄土窑一带孔兹岩系中石榴石的演化史及其地质意义     

刘福来 《吉林大学学报(地球科学版)》1996,(3)

红赐堡—黄土窑一带早前寒武纪孔兹岩系经历一期麻粒岩相变质作用，并可划分四个变质阶段。各阶段石榴石的分布、形态、矿物组合、化学成分及其成因条件均存在明显差异。通过成因矿物学的系统研究，结合多种地质温压计的估算结果及变质反应实验资料，确定本区孔兹岩系石榴石的结晶生长演化史及变晶变形序列。  相似文献