带微处理器的自动校时数字钟

本文就目前地震台站普遍使用的小规模CMOS电路构成的数字钟元件多、可靠性不高等缺点,提出以INTEL 51系列单片机为核心构成的具有自动校对功能的数字钟,本系统硬件结构简单,系统可靠性强,并可自动根据BMP信号校时,操作简便且精度高。     

台风转向过程移动速度的气候特征

本文根据1949—1978年30年的资料,对西北太平洋台风在转向过程中(4天)的移动速度进行了统计分析。发现台风移这快慢与台风强度和范围关系不大。而台风中心纬度较高时, 出现快速(≥24公里/个时)移动台风的频率较大。对转向前后持续24小时的快速和慢速台风路径段的统计表明,转向以前,24小时平均路径段的方向几乎没有什么差别; 转向后快速路径段的平均方向比慢速路径段咯偏东一些。     

我国东部新生代玄武岩岩石化学的一些探讨

新生代是地球上玄武质岩浆的主要活动期。在我国东部,新生代玄武岩分布也极广泛,由北往南自大兴安岭、松辽盆地经华北、苏闽浙至台湾、海南岛以及近海大陆架均有不同程度的出露。时间上从老第三纪至史期均有玄武岩喷发活动。     

苏联长期天气预报的物理统计综合方法

1964年以来,苏联地球物理观象总台动力气象室深入研究了长期预报的物理统计方法,并从1970年起作出业务预报。它的工作代表了苏联物理统计预报方法的现状和动向,现综述如下。一、基本原理和信息来源物理统计方法是统计预报方法的发展。近十几年尤金等人在统计预报的基础上致力于加强其物理内容,并引进现代数理统计理论,形成了物理统计综合方法。它的基本原理是:从表征大气物理现象相互联系的信息系统中,挑选出符合一定要求的良好的预报关系,对因子和预报量的自然正交分解系数按统计方法建立预报方程并求解,再对预报结果检验评定以改进方法。     

用可见光与红外云图资料综合作降雨量估算的试验

利用红外和可见光云图亮温资料估算单站降水量级,结果发现红外和可见光云图结合估算降水量效果比单用红外云图效果要好,大雨的空报率明显降低。     

黑龙江省东部龙爪沟群的划分及其与鸡西群对比

一、前言黑龙江省东部地区(图1)中生代地层较为发育,含有丰富的煤炭资源。它们以鸡西群及龙爪沟群为代表。前者以陆相含煤沉积为主,夹有少量海相沉积,后者则以海陆交互相沉积为主,夹多层火山岩。两群剖面清楚,化石丰富,是研究我国侏罗—白垩系界限的重要地区之一。同时,对两群的正确划分与对比,也将有助于煤田普查、勘探及预测。     

长期天气豫告之大势

寻常天气豫告,推测天气之变动,只限於周日。然水旱灾荒之防治,栽种作物之决择,断非寻常天气豫告所能为力,是以有长期天气豫告之需要。一旦灾荒发生,不仅危及人民生计,亦且影响国家财力。一九三一年长江流域发生空前水灾,损失估计达十四万万元,一九三四年长江流域又遭严重之旱灾,损失估计达七万七千五百万元。至於中国中部因雨量变率之大,尤见灾害频仍。旱潦之来,虽非人力所能阻止,然能预测於前,得未雨绸缪。施以补救,则生民不致横遭     

吕宋海峡内波吸引子的三维数值模拟

Internal waves propagate along wave beams that are inclined with respect to the horizontal plane. It is conjectured that the internal waves generated in the Luzon Strait may be confined between the double ridges in the strait and concentrate to a closed trajectory, the so-called internal wave attractor, due to the reflection of wave beams from the lateral boundaries, sea surface and bottom. This work carried out two experiments using a three dimensional non-hydrostatic general circulation model, MITgcm, to investigate the possibility that the ridges in the Luzon Strait allows for internal wave attractors. Baroclinic current in both of the experiments demonstrate the forming of ring-like patterns in some section around 20° and 21°N, indicating that the development of the internal wave attractors are allowed in the Luzon Strait. The different resolutions and initial conditions in the two experiments also reveal that the internal-wave-attractor phenomenon is robust in this region.     

2008年中国沿岸冬季寒潮激发陆架波的小波分析

This study applies the wavelet analysis to the tidal gauge records, alongshore winds, atmospheric temperature and pressure along the China coast in winter 2008. The analysis results show three events of sea level oscillations(SLOs) on the shelf induced by winter storms. The first event occurred from January 9 to 21. The SLO periods were double-peaked at 1.6–5.3 and 7.0–16.0 d with the power densities of 0.04–0.05 and 0.10–0.15 m2·d, respectively.The second event occurred from February 5 to 18. The SLO period was single-peaked at 2.3–3.5 d with power density of 0.03–0.04 m2·d. The third event occurred from February 20 to March 8. The SLO periods were doublepeaked at 1.5–4.3 and 6.1–8.2 d with the power densities of 0.08–0.11 and 0.02–0.08 m2·d, respectively. The SLOs propagated along the coast from Zhejiang in north to Guangdong in south. The phase speeds ranged about 9–29m/s from Kanmen to Pingtan, 5–11 m/s from Xiamen to Huizhou and 11–22 m/s from Huizhou to Shuidong. The dispersion relation of the SLOs shows their nature of coastal-trapped wave.     

中国东海海平面长期变化与趋势研究

From the analyses of the satellite altimeter Maps of Sea Level Anomaly(MSLA) data, tidal gauge sea level data and historical sea level data, this paper investigates the long-term sea level variability in the East China Sea(ECS).Based on the correlation analysis, we calculate the correlation coefficient between tidal gauge and the closest MSLA grid point, then generate the map of correlation coefficient of the entire ECS. The results show that the satellite altimeter MSLA data is effective to observe coastal sea level variability. An important finding is that from map of correlation coefficient we can identify the Kuroshio. The existence of Kuroshio decreases the correlation between coastal and the Pacific sea level. Kurishio likes a barrier or a wall, which blocks the effect of the Pacific and the global change. Moreover, coastal sea level in the ECS is mainly associated with local systems rather than global change. In order to calculate the long-term sea level variability trend, the empirical mode decomposition(EMD) method is applied to derive the trend on each MSLA grid point in the entire ECS. According to the 2-D distribution of the trend and rising rate, the sea level on the right side of the axis of Kuroshio rise faster than in its left side. This result supports the barrier effect of Kuroshio in the ECS. For the entire ECS, the average sea level rose 45.0 mm between 1993 and 2010, with a rising rate of(2.5±0.4) mm/a which is slower than global average.The relatively slower sea level rising rate further proves that sea level rise in the ECS has less response to global change due to its own local system effect.