夏季对流云初期回波与降水之间的关系

1979—1981年6和7月份在安徽屯溪机场,用711雷达对对流云初期回波及其发展过程进行了观测。资料分析表明:(1)对流云的初期回波绝大多数是在云的暖区形成的,因此,屯溪地区夏季对流云中暖云过程对降水形成起重要作用.(2)用回波顶升速、回波顶高和强度为35dbz回波的厚度、初期回波中心高度变化情况可以定性估计积云降水的强弱.     

Numerical study of lake-land breeze over lake vättern Sweden

This paper describes a two-dimensional lake breeze model with turbulent energy closure. The simulated results show that (1) the front of the lake breeze progresses inland faster in the late afternoon than at the fully developed stage; and (2) the lake breeze and land breeze have larger extension offshore than inland. The acce-leration of the front in the declining phase of the lake breeze is explained in terms of the decreased turbulent fric-tion acting on the head of the lake breeze. The larger extension offshore, probably, is attributed to the smaller roughness of water surface and to the offshore synoptic wind.     

Design and test of an improved scheme for global spectral model with reduced truncation error

An improved scheme of spectral model has been investigated in this paper. Through the introduction of a reference atmosphere, prognostic variables become smoother on the tilled sigma-surface over mountains or a frontal zone, and thus truncation errors are reduced. As a result, the problems about Gibbs waves and negative value of model topography on the sea, which are encountered in the current spectral model in the world, can be solved by the improved scheme. For comparison we have performed the numerical integrations of barotropic and baroclinic Rossby-Haurwitz waves, as well as the prediction of real cases with the improved scheme and the current scheme of spectral model. These results show that the scheme presented in the paper is better than the current scheme of spectral model.     

A statistical predicting scheme of the intensity of the sth over the western North Pacific

By performing error analysis of the information from the 48-hr forecasting charts of the 500-hPa fields by the B model over eastern Asia in the period of July to September 1982 and expansions of the height fields of westerlies and the subtropical zone by use of the Chebyshev polynomial and EOF, respectively, a scheme is developed for predicting the synchronous STH coefficient (i. e. time coefficient) in terms of the Chebyshev one, thus making possible statistical forecasting of the 500-hPa subtropical field within 48 hr. Tests with independent samples indicate that, to a certain extent, this scheme can be used in operational prediction as a reference.     

膨胀土与地形变

本文根据南京地震台短水准场地膨胀土研究的实际资料,指出了在膨胀土发育区进行地形变观测、地震地质和震害调查、烈度小区划等项工作时,必须考虑到膨胀土特性这个因素,以避免失误。     

阿斯南地震地质条件与地震形变带特征

本文介绍了阿斯南地区的地震和地质概况,在此基础上重点论述了构造的成生、发展与地震形变带特征,认为谢利夫盆地是晚新生代以来逐渐发展形成的,北东向阿斯南断层第四纪以来活动强烈,本次地震是该断裂继续活动的结果。     

岩石摩擦滑动的声发射b值

用双剪法进行岩石摩擦实验并测定了声发射b值。实验表明,粘滑发生前b值稳定并稍有增加,多次粘滑过程中b值基本不变,随着正应力的增加b值增加。     

五台山区滹沱群变质基性熔岩中锆石U—Pb年龄

滹沱群青石村组刘定寺变质基性熔岩为海底火山喷发的基性熔岩,岩枕及气孔充填构造发育,具变余拉玄结构及变余间粒结构。岩石的主要化学成分在AFM图(图2)上落在拉斑玄武岩区,在TiO_2-K_2O-P(?)O_5图(图3)和FeO-MgO-Al_2O_3图(图4)上属大陆玄武岩类型。该熔岩中锆石晶形完整而复杂,光泽强,透明度好、从五个不同粒级组分的锆石测得U-Pb一致线年龄,其上交点年龄为2 366_(-94)~(+103)Ma,下交点年龄为178_(-46)~(+43)Ma(图5)。该年龄首次为滹沱群的下界提供了可靠的同位素年龄证据,有助于关于滹沱群时代争议的解决。     

山西寿阳—阳泉地区石炭—二叠系沉积环境及其沉积特征

本区石炭—二叠系是在海湾背景下发育的一套由滨海平原—三角洲平原—冲积平原沉积组成的海退层系。主要沉积环境是三角洲平原,其上部为冲积平原包括网状河和辫状河;下部为海湾（或分支间湾）、潮下碳酸盐岩、潮间介壳滩、碎屑岩潮坪及滨海沼泽湿地等。三角洲为河控浅水三角洲。上述沉积环境,随海水退却在时空上具明显的规律性变化。     

Probability of received-power fluctuation of an optical system in the turbulent atmosphere

The probability of received-power fluctuation in the turbulent atmosphere is discussed with a simple and yet reasonable model for a direct-detection optical system. Good agreement was found between the theore-tical results and the field experiment. Thus the analysis in this paper may be taken as a guide for the design of atmospheric optical system.