夏季北半球中低纬地区热量的垂直输送     

杨广基 《大气科学》1984,8(4):457-464

本文应用多年平均的风场、垂直速度场和温度场,研究了平均经纬向垂直环流和感热垂直输送的关系.并且讨论了北半球中低纬不同地理区域感热垂直输送的特征. 研究结果表明,夏季北半球中低纬地区感热垂直输送的方向基本上和平均垂直环流的方向相一致.大型定常涡旋对感热输送的高值区和涡旋位能向涡旋动能转化的高值区均在25°—45°N之间的中高空,不同的是后者中心比前者高. 850—200mb之间的对流层中,北半球中低纬有三个感热向上输送的高值区(亚洲大陆及其附近地区,中、东太平洋和大西洋大部分地区)和三个感热向下输送的高值区  相似文献   

Magnetic properties,characteristic spectra and colors of turquoise     

Huifen Zhang  Chuanyi Lin  Zhongwei Ma  Zhenguo Yang  Enlin Zhang 《中国地球化学学报》1984,3(4):322-332

The unique bright bluish-green color of turquoise as a high-grade jade has long received wide attention. The relationship between the color of turquoise and its composition and structure is described in this paper on the basis of chemical data, EPR, magnetic susceptibility, absorption and Mössbauer spectra. The results show that the basic color of turquoise (bright blue) is related to the existence of octahedrally on the amount of iron. EPR, magnetic susceblue through green to earth-yellow is dependentcoordinated Cu²⁺ and the shade variation from ptibility, and crystal-field spectra of Cu²⁺ have been analyzed and compared with the theoretical calculations. A preliminary discussion is also made of the color change as a function of temperature.  相似文献   

33模Lorenz系统的某些总体特征   总被引：4，自引：3，他引：4  

杨培才 《大气科学》1987,11(1):48-57

本文除了用直观的模态阵图方法,简要地分析了二维Benard对流问题的高维截谱模式的构造外,还在33模系统求解结果的基础上,计算了系统的平均能量、平均耗散和平均垂直热通量.并根据这些描述系统的总体特征的物理量在一些模态子集上的分布,讨论了高维系统对原始方程的逼近问题.  相似文献   

PREDICTABILITY LEVELS OF MONTHLY FORECAST BASED ON TIME-AVERAGED OCEAN/ATMOSPHERE VARIABLES —A NATURALLY OCCURRING ANALOGUE STUDY          下载免费PDF全文

Qiu Chongji  Chou Jifan  Yang Dawei 《Acta Meteorologica Sinica》1987,1(1):34-42

Naturally occurring analogues between the monthly averaged data of 1000,500 and 100 hPa geopotential height and the sea surface temperature (SST) in the Pacific,Atlantic and Indian Oceans during the period January 1956-December 1972 are used to study the potential predictability levels of forecasting the monthly mean ocean/atmosphere variables.It is found that in the ocean-atmosphere system the forecast of geopotential height may be more difficult than SST,and that the predictability level of monthly mean geopotential height anomaly calculated from the corresponding monthly mean SST appears relatively poor,but it can be improved by using the past observational data of monthly mean SST/geopotential fields.  相似文献   

THE EFFECT OF ASPECT RATIO ON THE BIFURCATION PROPERTIES OF A DOUBLE PARALLEL-CONNECTION LORENZ SYSTEM     

Zou Chengzhi  Yang Peicai  Zhou Xiuji 《大气科学进展》1986,3(4):406-423

A double parallel-connection (DPC) Lorenz system is developed by performing spectrum truncation of the Galerkin series expansion of the two-dimensional Rayleigh-Benard convection equation. Analyses of the equilibrium states indicate that a convective roll stems from a flow with a given wavenumber first losing its stability for a particular aspect ratio β after a stable laminar flow gets unstable; when β has the value βc able to deprive synchronously two flows with different wavenumbers of stability, occurrences of convective rolls with different wavenumbers depend entirely on the initial conditions, in good agreement with the relevant experimental results. The calculations of the unstablized rolls show that, with a smaller β (as compared with βc), the DPC Lorenz system has the same bifurcation properties as the ordinary Lorenz system; for a moderate β, the system has very complicated periodic, quasi-periodic and phase-locking motions; for a larger β, it results in intermittent chaos and causes mean flows with different numbers of vortices to occur alternately with time. All these indicate that β has substantial effect on the two Lorenz systems coupled through parallel connection in their interaction and the results.  相似文献   

天然钛榴石的穆斯堡尔谱及晶体化学分析     

黄文英  蔡紫筠  杨凤华  江加济  刘燕杰  金振声 《矿物学报》1986,(1)

本文收集了一组钛榴石样品,作了穆斯堡尔谱和化学分析。采用各对应双峰等值限制拟合。拟合结果,统计误差X~2均较小。文中还分析了钛榴石结构的阳离子占位情况,并对其五对双峰谱指派如下:Fe~(3+)在[Y]位和(Z)位,Fe~(2+)在{X}和[Y]位,而另一对双峰指派为Fe~(2+){X}→Fe~(3+)(Z)的电荷离域。从化学分析和穆斯堡尔谱数据求出二种方法Fe~(2+)/∑Fe的差值,说明钛榴石中有Ti~(3+)的存在,用此简便方法估算了Ti~(3+)的含量,得出了四面体中阳离子的占位择优为Fe~(3+)>(Al~(3+),Ti~(4+))的结论。  相似文献   

矿山排供结合探讨     

杨解 《华东地质学院学报》1986,(1)

本文解决大水矿床排供结合问题是国民经济建设中具有实际意义的重要课题。本文较系统地论述了解决排供矛盾和排供结合的办法。着重从地质一水文地质条件,从矿山排水前后矿床地下水的补给、迳流、排泄条件来论证对排供结合方案的选择,并以一个典型的矿床作为实例加以阐明。  相似文献   

川黔湘交境寒武纪层序划分   总被引：7，自引：2，他引：7       下载免费PDF全文

徐世球  段冶 《地球科学》1995,20(5):485-495

根据层序地层学的基本原理和概念，以露头剖面研究为基础将川黔湘交境寒武素划分为１６个三级层序，其中下统含７个中统３个，上统６个，既有Ⅰ型层序又有Ⅱ型层序，具倾斜边缘的盆地中形成的Ⅰ型层序仅发育在早寒武世早期，共２个；具台缘斜坡的盆地中形成的Ⅰ型层序发育在台地形成及发展阶段，即早寒武世后期至晚寒武世早中期，共５个。上述层序的详细研究为海平面升降和加里东早期的构造运动的认识提供了新的基础。  相似文献   

强震前地震多重分形谱的异常及其物理解释：以乌什研究区为例   总被引：3，自引：0，他引：3  

朱令人  龚宇清 《内陆地震》1995,9(2):97-103

应用有关软件分析新疆乌针研究区地震活动时间分布的多重分形谱Ｄｑ－ｑ和ｆ（ａ）－ａ。发现两次６级强震发生前，多重分形谱发生显著变化。主要特征是对一定的ｑ区间奇异性强度因子ａ取值变宽，Ｄｑ－ｑ曲线变陡，ｆ（ａ）－ａ的左端点或右端点下降。  相似文献   

豫西前寒武纪汝阳群遗迹化石   总被引：18，自引：3，他引：18  

杨式溥  周洪瑞 《地质论评》1995,41(3):205-210

本文研究的遗迹化石：Ｒｕｙａｎｇｉｃｈｎｕｓ ｌｏｙｕｅｎｓｉｓ ｉｃｈｎｏｇｅｎ，ｅｔ ｉｃｈｎｏｓｐ．ｎｏｖ．，Ｔｏｒｒｏｗａｎｇｅａ ｒｏｓｅｉ ｗｅｂｂｙ，Ｃｈａｎｇｃｈｅｎｇｉａ ｉｃｈｎｏｓｐ．，Ｓｑｕａｍｏｄｉｃｔ ｙｏｎ（？）ｉｃｈｎｏｓｐ．等发现于河南西部鲁山县和汝阳县的汝阳群云梦山组和北大尖组。根据同位素年龄值，微古植物和叠层石资料，产遗迹化石的汝阳群应相当于中元古代，可以和蓟  相似文献