中国海区风暴潮数值试验   总被引：1，自引：0，他引：1  

张占海  吴辉碇 《海洋预报》1990,(2)

本文叙述中国海区9个台风风暴潮个例数值模拟结果。整个中国海海域分成三个子区,采用交替方向隐式差分方法积分模式方程组,计算结果指出所提出的方案对业务预报的可能性和进一步急待解决的问题。  相似文献   

海洋浮游生物研究的主要动向     

王荣 《海洋科学》1979,3(S1):33-37

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一个稳态Kalman滤波风暴潮数值预报模式   总被引：4，自引：1，他引：4  

于福江  张占海  林一骅 《海洋学报》2002,24(5):26-35

利用Kalman滤波资料同化技术将海洋站水位观测资料融入二维线性风暴潮模式中,研制具有资料同化能力的风暴潮预报模式,改进风暴潮模式计算结果.通过在风暴潮模式的动量方程中加入模式噪声项来修正模式本身和气象强迫力的不确定性.确定性模式的输出通过带有观测噪声的观测方程与可利用的海洋站的潮位观测资料联系起来.假定初始的模式噪声和观测噪声满足均值为0的高斯分布,用迭代法得到计算区域的状态向量的稳态Kalman滤波,进而得到风暴潮模式输出的最优线性校正结果.利用这种资料同化技术,对1956年发生在东海的一次强风暴潮过程进行了后报试验,结果表明,该同化方法对短期风暴潮水位后(预)报有一定的改进.  相似文献   

中加利福尼亚南蒙特里湾的新褶皱和断裂     

J．MGardtler-Taggart王玉荣  刘宝柱 《海洋地质前沿》1994,(7):14-15

断裂 从高分辨率的地震反射波记录找出了17条断裂，长自200m至1500m不等．这些断裂错开了中新世至全新世的沉积岩．某些断裂错开了自垩纪结晶基岩。在地震反射波剖面上判读断裂的最大深度受到亚基底信号穿透深度(PS1—87-MB航次为90m，PS1—89-MB为100m)的限制。17条断裂中的4条从扫描声纳记录也能辨别出来．  相似文献   

秋,冬季赤道西太平洋面气象特征初析     

林锡贵  张庆荣 《海洋与湖沼》1992,23(4):371-378

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渤海海冰漂移数值研究   总被引：1，自引：0，他引：1  

张占海  吴辉碇 《海洋预报》1994,(3)

本文利用海冰－海洋动力耦合模式对渤海典型天气形势下海冰动力过程作了数值模拟，海冰模式建立在动量和质量守恒基础上，忽略了海冰变化的热力过程。海冰厚度被划分为三类：堆积冰、平整冰和开阔冰，冰的形变由一个厚度的重新分布约束条件确定。海洋模式是一个二维风暴潮模式．同时考虑了潮汐的作用。风场资料来自于沿岸气象观测站每日四次的风观测，计算网格是十分之一经纬度。主要的分析和模拟是在大气和海洋共同作用下海冰的漂流特点。观测结果比较表明，数值模拟结果基本上反映了该海域流冰的漂移性质，同时也可为短期冰情预报提供有益的参考。  相似文献   

夏季南黄海潮混合锋的分布   总被引：8，自引：0，他引：8  

魏皓  杨殿荣 《海洋湖沼通报》1993,(1):1-7

本文根据南黄海风、潮、热通量等实测资料,用stigebrandt的一维模式,对夏季南黄海潮混合锋的位置进行模拟。通过对阳光透射效应和风作用的讨论发现,可以忽略阳光透射对锋的水平位置的影响,而风的作用则是不可忽略的。根据实测锋的剖面结构,文中特别指出,由于浮力平流效应,表层锋水平位置往往与底层锋相距较远,应对二者分别研究。尽管文中的一维模式也不能对受浮力平流影响较大的表层锋准确模拟,但计算结果与实测底层锋符合良好,可见,用此模式来研究底层锋是合适的。  相似文献   

青海高原近40 a降水变化特征及其对生态环境的影响   总被引：13，自引：3，他引：13  

汪青春  秦宁生  张占峰  唐红玉  陈芳  祁如英 《中国沙漠》2007,27(1):153-158

 利用青海省1961-2002年26个代表站逐日雨量资料和高原东部地区10个站的降水自记资料,分析了近40 a来降水量、雨日、雨强的气候变化特征。结果表明:青海高原近40 a来年降水量无明显的变化,但夏半年降水量呈减少趋势,冬半年降水量呈明显的增多趋势；夏半年降水量和雨日虽在减少,但降水强度在增大；夏半年降水量的减少主要是降水日数的减少造成的,而冬半年降水量的增加是由于雨日增多和每个降水日平均雨量的增大所造成；随着气候变暖,夏、秋季降水明显偏少,出现暖干化的气候趋势。  相似文献   

Experiment of near surface layer parameters in ice camp over Arctic Ocean     

卞林根  张占海  马永锋  陆龙骅  程斌 《极地研究》2007,18(2):91-99

Estimates of near surface layer parameters over 78°N drifting ice in ice camp over the Arctic ocean are made using bulk transfer methods with the data from the experiments operated by the Chinese Arctic Scientific Expedition in August 22-September 3,2003.The results show that the net radiation received by the snow surface is only 3.6 W/m2,among which the main part transported into atmosphere in term of sensible heat and latent heat,which account for 52% and 31% respectively,and less part being transported to deep ice in the conductive process.The bulk transfer coefficient of momentum is about 1.16×10-3 in the near neutral layer,which is a little smaller than that obtained over 75°N drifting ice.However,to compare with the results observed over 75°N drifting ice over the Arctic Ocean in 1999,it can be found that the thermodynamic and momentum of interactions between sea and air are significant different with latitudes,concentration and the scale of sea ice.It is very important on considering the effect of sea-air-ice interaction over the Arctic Ocean when studying climate modeling.  相似文献   

白云鄂博矿床碳酸岩墙/脉和赋矿白云岩中流体包裹体研究   总被引：2，自引：0，他引：2  

秦朝建裘愉卓  周国富王中刚张台荣  肖国望 《岩石学报》2007,23(1):161-168

Fluid inclusion study has been carried out for the carbonatite dykes/veins and the ore-hosted dolostone of the Bayan Obo superlarge REE-Fe-Nb deposit in order to provide the evidence and constraint for their origin.Based on the detailed geological observation and mineralogical investigation,the heating and cooling stage and laser Raman spectroscopy were mainly used for the laboratory work of this study.Following results have been obtained:(1)The discovery of melt and melt-fluid inclusions from carbonatite dykes/veins in the Dulahara and Jianshan Mountains,combined with the fine-grained(aplitic)texture of rocks,as well as the types and features of fluid inclusions such as CO_2 enrichment,higher homogenization temperature,provides a direct evidence for the magmatic origin of these dykes/veins.(2)The carbonatite dykes/veins distributed in two regions,nearby the axis of the Kuangou anticline and in the east to Bayan Obo town,mainly show coarse-grained texture.No melt inclusion was found,and the fluid inclusions possess features of less CO_2,lower homogenization temperature and higher salinity.They are tentatively identified as veins formed by some carbonate-rich hydrothermal solution.(3)Bedding carbonate layers/lens within the hanging wall and foot wall of ore-hosted dolostone,previously recognized as of magmatic origin,mainly composed by dolomite.The existence of single phase pure aqueous inclusions with very low homogenization temperature indicates their sedimentary origin.(4)The ore-hosted dolostone possesses apparent bedding and laminated structures.No melt inclusion was found,but,both single phase pure aqueous inclusions and CO_2 bearing multi-phase fluid inclusions coexisted in dolostones.In the direction towards ore-bodies,the homogenization temperature and CO_2 contents of fluid inclusion show an increasing tendency.It indicates the sedimentary origin of dolostone superimposed by late fluid metasomatism.  相似文献