南极普里兹湾气旋的生消发展   总被引：3，自引：4，他引：3  

解思梅  郝春江  梅山  刘克威  魏立新 《海洋学报》2002,24(6):11-19

利用1989～2000年现场观测的气象资料,特别是自1997年以来在南极考察船上接收的NOAA卫星极轨高分辨的卫星云图,研究了普里兹湾气旋的生消发展;提出了夏季绕极气旋进入普里兹湾内也会发展加强,在湾内东风带里也能生成气旋的新观点,修正了普里兹湾仅是气旋墓地的不全面说法,从而进一步完善了南极西风带绕极气旋和东风带上气旋生消发展的理论;研究了普里兹湾冰-气-海相互作用的机理,解释了气旋发生、发展的物理过程.用整体动力学输送法计算了进入普里兹湾980205号绕极气旋爆发性发展的能量交换,指出气旋在超过冰坝进入冰间湖可以获得巨大的热量,使气旋迅速发展成为具有南极特色的强风暴,风力达12级以上,平均风速为38m/s;瞬时最大风速达100m/s.  相似文献   

富钴结壳分布的分形特征   总被引：8，自引：0，他引：8  

何高文 《海洋地质与第四纪地质》2001,21(1):89-92

利用我国在西太平洋国际海底两个海山获得的富钴结壳资料进行分形研究后发现，富钴结壳的分布具有变维分形分布的特点，结壳丰度呈二阶累计和分形分布，结壳厚度呈多阶不定累计和分形分布，通过计算得到了它们各自的分维数，进而对两个海山的结壳资源进行了初步评价。  相似文献   

黄河三角洲潮滩潮沟体系的分维特征   总被引：11，自引：2，他引：11  

孙效功  赵海虹  崔承琦 《海洋与湖沼》2001,32(1):74-80

利用分形分维方法对黄河三角洲潮滩和潮沟的地貌特征进行了定量研究。结果表明，潮滩和潮沟的分维值可以较好地反映潮滩潮沟的发育演化规律。随着时间的推移和潮沟潮滩的进一步发育，黄河三角洲潮沟的分维值呈逐渐增大的趋势，而潮滩的分维值则呈逐渐减小的趋势，两者在分维值的变化上存在着负相关关系。该研究为黄河三角洲潮滩发育时空谱系的建立和深入研究提出了一种新方法和新的定量指标。  相似文献   

Species composition and distribution of marine nematode community in the North Taiwan Strait   总被引：9，自引：4，他引：9  

Cai Lizhe  Hong Huasheng  Zou Chaozhong  Fang Shaohu  L&#; Xiaomei  Zhang Yueping 《海洋学报(英文版)》2001,20(2):221-229

I~IOW~ne nelnatode is a ban gIOup of benthic OrgAnsrns. Abbot 5 000 spotes Of free-livingnelnatedes have ben dedbo so far, and it has ho estimated that abbot 20 (XX) are as yetunknoWn. Chinese bothologist has Paid attention to marine nelnatodes in China seas in yare. The spatial distribution and shoes commotion of marine nelnatedes in the HUanghe EstUary, Qinhuangdao waters, QingdaO Bay and Xiamen ~ have ho reported (Zhang etal., 1990, 1991, 1993; ac and Li, 1998). ~ new shoes in the…  相似文献   

Distribution of As, Cr and V species in the Po-Adriatic mixing area, (Italy)   总被引：1，自引：0，他引：1  

M. Pettine  D. Mastroianni  M. Camusso  L. Guzzi  W. Martinotti 《Marine Chemistry》1997,58(3-4)

The distribution of dissolved and participate concentrations of As, Cr and V was investigated in the mixing area of the Po river in five surveys over the period March 1992-March 1995. The data obtained indicate noticeable contamination of coastal waters of the northern Adriatic with Cr but not As or V. Total dissolved concentrations for As and V were comparable with oceanic levels but were higher by a factor of 4 for Cr. These results suggest either low anthropogenic inputs of As and V, from terrigenous and atmospheric sources, or efficient removal mechanisms. The investigated metals had low reactivity during freshwater-seawater mixing and the distribution of concentrations in the dissolved and solid phases suggests that the dilution process is the main factor controlling the transport of these metals to the sea in low-to-medium solid transport conditions. Further investigations are required to elucidate the behavior of these metals during high solid transport conditions. Significant changes in the speciation of As occurred during the transition between the two end-member matrices. In the coastal waters of the northern Adriatic, the arsenite fraction in winter, and the arsenite and dimethylarsinate fractions in summer increased with respect to riverine waters. Changes in the speciation of chromium were minor, but also showed a small increase in reduced species in marine waters.  相似文献   

烟威渔场盐度预报及分析     

郑东  张瑞安 《中国海洋大学学报(自然科学版)》1989,(Z1)

本文以我国北黄海的烟威渔场为研究对象,采用优选因子场预报模式,对盐度的时空变化进行预报试验。文中对所采用的统计预报方法,作了简要介绍。对影响本海区盐度变化的显著因子及预报结果作了初步分析。预报试验表明:预报的总体平均绝对误差为0.27‰,预报相对误差在18％左右,预报误差小于0.5‰的站数占总站数的85％,预报趋势与实测资料基本一致。  相似文献   

潮汐沉积率与沉积间断   总被引：16，自引：3，他引：16  

李从先  王平  范代读  李铁松 《海洋地质与第四纪地质》1999,19(2):11-18

在浙北奥陶系文昌组和长江三角洲开敞型淤泥质海岸非潮道潮汐纹层研究的基础上,得出与国外同类研究相近的沉积率。现代海岸进积速度和潮坪沉积的观察及测试证明,上述沉积率是难以置信的。现代潮坪观测表明,潮汐纹层在形成过程中即包含着改造,所保留的纹层占应形成数的不到１０％,其余９０％以上被侵蚀。小型层序是风暴和平静天气的产物,为风暴层序,与大小潮周期无关。其地层中保留的数量不到应生成数的１０％,其余９０％被改造。小型层序被侵蚀,其中的纹层随之消失。致使潮坪层序中保存的纹层数仅为应形成数的０．２％。被改造的纹层和单层留下的仅是侵蚀面,即小间断。在进行潮汐沉积高分辨率的研究时应充分重视沉积间断的作用  相似文献   

晚第四纪冲绳海槽北段CaCO3含量的时空变化及其控制因素     

李军  李凤业  周永青  齐金成  厉玉乐 《海洋地质与第四纪地质》2004,24(2):15-22

对取自冲绳海槽北段的6个沉积岩心进行了CaCO3含量、粒度和铀系同位素分析，结合氧同位素数据和海槽其他钻孔的相应结果，探讨了冲绳海槽北部晚第四纪以来CaCO3含量的垂向与横向变化特征。结果表明，冲绳海槽北段沉积总体上表现为全新世CaCO3含量高、晚更新世CaCO3含量低的“大西洋型”碳酸盐演化特征，但冲绳海槽北段和中部的碳酸盐演化特征并不一致，海槽内西坡、槽底和东坡的不同部位其演化特征也存在较大差异。碳酸盐含量的变化与沉积物粒度特征密切相关，晚第四纪冲绳海槽碳酸盐演化的时空差异是多种因素相互作用的结果。  相似文献   

东海南海交接带重磁场特征及新生代盆地成因     

吴时国  郭军华  刘展 《海洋地质与第四纪地质》2004,24(3):49-55

东海南海构造交接带及其邻近海区(简称交接带)位于中国东部大陆边缘,东邻俯冲板块边界。台湾以北是琉球海沟俯冲带,台湾以南为马尼拉海沟俯冲构造带。区域重磁资料分析结果表明,该东海陆架区存在3条重力高和2条重力低,重力高分别对应于闽浙隆起带、渔山低凸起和陆架外缘隆起,最大值高达50×10-5m·s-2;重力低对应于沉积盆地,最低值在台西南盆地,约为-20×10-5m·s-2。重磁特征表明东海盆地外缘台湾 钓鱼岛构造带具有明显的自由空间异常,磁场为平缓负异常,由古近系、白垩系或更老的变质岩及中新世的侵入岩组成,向南延伸至澎湖隆起。因为澎湖隆起具有高重力异常,放射性年龄表明这些碱性玄武岩形成于17 8～8MaBP,其特征同现在的琉球岛弧一样,可能是残留的古琉球岛弧。台西南盆地南侧(上陆坡)的凸起具有类似的幅度异常,呈ENE—WSW向,并消失在台西南盆地南段。新生代以来,盆地张裂活动具有不同时性,并向陆架边缘变得年轻。东海大陆边缘盆地属弧后残留盆地成因,多因岛弧的迁移而新生,但珠江口盆地则是被动大陆边缘裂陷作用所致。  相似文献   

The Formation and Circulation of the Intermediate Water in the Japan Sea   总被引：1，自引：0，他引：1  

Jong-Hwan Yoon  Hideyuki Kawamura 《Journal of Oceanography》2002,58(1):197-211

In order to clarify the formation and circulation of the Japan/East Sea Intermediate Water (JESIW) and the Upper portion of the Japan Sea Proper Water (UJSPW), numerical experiments have been carried out using a 3-D ocean circulation model. The UJSPW is formed in the region southeast off Vladivostok between 41°N and 42°N west of 136°E. Taking the coastal orography near Vladivostok into account, the formation of the UJSPW results from the deep water convection in winter which is generated by the orchestration of fresh water supplied from the Amur River and saline water from the Tsushima Warm Current under very cold conditions. The UJSPW formed is advected by the current at depth near the bottom of the convection and penetrates into the layer below the JESIW. The origin of the JESIW is the low salinity coastal water along the Russian coast originated by the fresh water from the Amur River. The coastal low salinity water is advected by the current system in the northwestern Japan Sea and penetrates into the subsurface below the Tsushima Warm Current region forming a subsurface salinity minimum layer. This revised version was published online in August 2006 with corrections to the Cover Date.  相似文献