南太平洋辐合带(SPCZ)的特征分析   总被引：1，自引：0，他引：1  

吴增茂  陈登俊  温之平 《中国海洋大学学报(自然科学版)》1993,(Z2)

根据热带西太平洋卫星云图资料及流场特征分析,讨论了南太平洋辐合带(SPCZ)的演变特征和形成机理。提出SPCZ是反映西太暖池同东太冷舌海气耦合系统以及暖池大气同相邻陆区大气间相互作用的重要特征。主要表现为在12～2月的热带西太平洋上的NW/SE辐合带,其形成原因主要应归因于西太暖池本身,以及暖池与东太赤道冷水舌强度与相对位置改变引发的Walker环流位置与走向的变动,另外,新几内亚岛及澳洲大陆也有重要影响。  相似文献   

周期浅析     

战淑芸  杨淑瑞 《海洋预报》1992,9(4):47-51

本文分析了滑动平均的数据处理方法对周期分析结果产生的影响。提出了过程变量同号积分的数据处理方法,并对亚洲西风指数序列进行了试验分析。分析结果表明,周期的长短与振幅的大小有密切关系,亚洲逐日西风指数的周期振荡具有明显的季节特征。  相似文献   

热带气旋进入广西影响区强度突然加强的环流特征及物理量诊断分析     

李宇  陈润珍  蔡敏  孔宁谦 《海洋预报》2006,23(Z1):104-109

本文对1960~2002年进入广西影响区的热带气旋进行统计分析,发现平均每年有4.3个热带气旋进入广西影响区,强度突然加强的平均每年有0.3个,发生在6~10月,其区域分布主要集中在海南岛东北部近海至粤西近海区域和北部湾海域。利用《台风年鉴》和《历史天气图》以及欧洲中心NCEP再分析资料,对这类热带气旋进行环流特征诊断分析,得出了一些结论,有助于更好地做出这类热带气旋的风力和降水预报。  相似文献   

基于子波分析的悬浮物散射信号特征提取实验研究     

张锁平 《海洋技术学报》2002,21(2):60-63

概述了应用子波分析对悬浮物测量中的声散射信号进行特征提取的方法 ,并对声散射信号识别的研究进行了探讨。对实测数据的实验取得了较好的结果  相似文献   

基于特征提取的目标变化检测方法研究     

朱朝杰  董广军  王仁礼 《海洋测绘》2007,27(2):50-52

针对不同时相遥感影像中特定目标的变化,研究了基于特征提取的目标变化检测方法。该方法首先根据目标的几何特征进行检测与提取,然后对提取出的两目标影像进行比较,得到特定目标的变化。实验结果表明该方法对特定目标的变化检测有较好的效果。  相似文献   

东海温度锋的分布特征及其季节变异   总被引：8，自引：4，他引：8  

汤毓祥 《海洋与湖沼》1996,27(4):436-444

根据１９３４－１９８８年东海水文观测资料，重点分析东海温度锋的分布特征及其季节变异，并结合近期中日黑潮合作调查研究成果，初步探讨温度锋季节变异和水团演变的关系，所得主要结论是：（１）东海不仅常年存在浙闽沿岸锋，东海北部陆架锋和黑潮锋，而且、春、夏两季，在东海南部还出现一条东海中部出架锋。（２）江海温度锋季节变化的特点是：冬季，锋的宽度和强度皆是表层最强，夏季，表层温度锋仅出现在浙江近岸小范围海域。  相似文献   

Effects of sediment properties on surface-generated ambient noise in a shallow ocean     

Jin-Yuan Liu  I-Chun Lin 《Ocean Engineering》2005,32(16):1887-1905

Surface-generalized ambient noise in a shallow ocean waveguide with a sediment layer possessing a specific class of density and sound speed distributions capable of describing a realistic seabed environment is considered in this analysis. This class of non-uniform sediment layer has the density and sound speed distributions varying with respect to depth as a generalized-exponential and an inverse-square function, respectively. The study invokes a formulation developed by Kuperman and Ingenito (Kuperman, W. A., Ingenito, F., 1980. Spatial correlation of surface-generated noise in a stratified ocean. J. Acoust. Soc. Am., 67, 1988-1996.) for surface noise generation, in conjunction with the analytical solutions for the Helmholtz equation corresponding to the sediment layer, to arrive at an analytical expression convenient for numerical implementation. The intensity and spatial correlation of the noise sound field are analyzed with respect to the variation of the system parameters, including frequency, sediment layer thickness, sound speed gradient, with emphasis on the effects of sediment properties on the ambient noise field. The results have demonstrated that the intensity of the noise field is relatively sensitive to the variation of the parameters, but the spatial correlation is affected to a less extent, suggesting that the energy distribution, rather than the spatial structure, of the noise field is more susceptible to the environmental variations.  相似文献   

Hydrographic features of the plume front in the Hangzhou Bay     

Wang Kangshan  Su Jilan 《海洋学报(英文版)》1993,12(1):17-28

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具有匹配不确定的奇异摄动系统的鲁棒控制   总被引：2，自引：0，他引：2  

高存臣  王宪杰 《中国海洋大学学报(自然科学版)》2004,34(5):918-920

对于同时具有结构匹配不确定和系统不确定量的奇异摄动系统，利用Lyapunov稳定性理论进行了鲁棒性研究。给出了1个理想奇异摄动系统的稳定鲁棒控制也是不确定奇异摄动系统稳定控制的稳定条件和鲁棒界，讨论了鲁棒界及其随参数变化的变化范围。本文是王宪杰，高存臣已有结果的推广。  相似文献   

Spatial variation of the intertidal sediments and macrozoo-benthic assemblages along Eighty-mile Beach, North-western Australia   总被引：3，自引：0，他引：3  

Pieter J.C. Honkoop  Grant B. Pearson  Marc S.S. Lavaleye  Theunis Piersma   《Journal of Sea Research》2006,55(4):278-291

The extensive intertidal flats along Eighty-mile Beach in North-western Australia appear to be monotonous and homogeneous and seem ideally suited to study tidal zonation in macrozoo-benthic communities and their possible correlates with characteristics of the sediment. In October 1999, we sampled benthic invertebrates and sediments at a total of 895 sampling stations distributed over six different locations, each location separated by 15 km of unsampled foreshore along Eighty-mile Beach. To test for the presence or absence of patterns of tidal zonation (distinct height-related zones of specific sediment grain sizes or zoobenthic taxonomic groups) or patchiness (distinct patches of specific sediment grain sizes or zoobenthic taxonomic groups not related to tidal height) each location was divided into three along-shore sections and each section (transect) was examined at two or three tidal heights. Zonation was observed for sediment grain sizes. Sediments were coarser at the highest intertidal level and finer towards the low water line. Benthic assemblages also differed among tidal heights, but in terms of species-composition the differences were not consistent among the locations. Each location supported a unique collection of benthic invertebrates. Therefore the hypothesis of the presence of distinct zones of specific species or zoobenthic taxonomic groups was rejected; the presence of benthic patches was confirmed. The distribution of sediments and the composition of benthic assemblages were surprisingly poorly correlated compared to those reported in 12 previous quantitative studies around the world. One possible explanation might be that super-cyclone Vance, which hit the study-area only six months before this study, contributed to this poor correlation. Alternatively, the poor correlation may indicate that biotic interactions are more important than the assumed abiotic structuring.  相似文献