Variational iteration solving method for El Nio phenomenon atmospheric physics of nonlinear model     

MO Jiaqi  *  WANG Hui  LIN Wantao  LIN Yihua. Anhui Normal University  Wuhu  China. Division of Computional Science  E-Institute of Shanghai Universities  Shanghai Jiaotong University Shanghai  China. Chinese Academy of Meteorological Sciences  Beijing  China. State Laboratory of Numerical Modeling for Atmospheric Sciences  Geophysical Fluid Dynamics  Institute of Atmosheric Physics  Chinese Academy of Sciences  Beijing  China 《海洋学报(英文版)》2005,(5)

1 IntroductionThe El Ni’o atmospheric physics oscillation is anabnormal phenomenon involved in the tropical Pacificocean- atmosphere interactions. Studies on the El Ni(ophenomenon are very attractive (Lin et al., 2000; Linet al., 2001, 2002; Wang, 2001; Feng et al., 2001;Feng et al., 2002; Liu et al., 2002; Wei and Chen,2003; Xie et al., 2002; Zhu et al., 2002; Pu et al.,2003; Gu et al., 2004; Yu and Liu, 2004). Lin and Mo(2004), Mo and Lin (2004) and Mo et al. (2004) alsostudied a s…  相似文献   

Observational evidence of the upwelling off cape shioyazaki in Fukushima Prefecture,Japan     

Hui Soo An 《Journal of Oceanography》1980,36(1):85-95

Using serial observations, evidence of the existence of upwelling in the region between the northeast flowing Kuroshio and the coast of Ibaraki and Fukushima Prefectures is presented. The complex and variable oceanic condition in this region sometimes conceals some of the evidence of upwelling. Evidence of upwelling can be seen in the distributions of temperature and salinity, and more clearly in those of dissolved oxygen and phosphate. The average position of the upwelling region is just off Cape Shioyazaki in Fukushima Prefecture. Such an upwelling phenomenon may be a general oceanic feature characteristic of the region at the poleward edge of western boundary currents.  相似文献   

珠江口伶仃洋温度分布特征     

田向平 《热带海洋学报》1994,(1)

依据实测资料，分析了伶汀洋冬、夏季的水温分布特征及其变化。冬季湾内水温的分布和变化较单一，夏季由于河流入海流量增大，河流与海洋水体的相互作用加强，明显可见两个冷、暖水锋在河口湾中段相交，上段为高温的河流淡水控制区，下段为低温的陆架水控制区，两者显著的特点是其控制区内温度变化很小，而在锋面转折地带的河口湾中段，盐淡水混合强烈，其温度变化大，温度等值线呈倾斜分布。  相似文献   

超声波对青石斑鱼体表吸收氯霉素能力的影响   总被引：2，自引：0，他引：2  

周永灿  黄晖  苏永全  陈国华 《海洋科学》2001,25(3):17-20

应用超声波对8－20cm青石斑鱼体表吸收能力的影响研究表明，超声波的超声强度和作用时间及及浸泡的氯霉素溶液的浓度对青石斑鱼体表吸收氯霉素的能力有显著影响，且呈正相关关系。此外，不同的超声作用方法也能显著影响实验石斑鱼的体表吸收能力，其中，超声后浸泡和浸泡后超声以及脉冲超声比连续超声均能更显著地提高石斑鱼的体表吸收能力。  相似文献   

Long-term changes in the fish community structure from the Tsushima warm current region of the Japan/East Sea with an emphasis on the impacts of fishing and climate regime shift over the last four decades     

Yongjun Tian  Hideaki Kidokoro  Tatsuro Watanabe 《Progress in Oceanography》2006,68(2-4):217

Japanese fisheries production in the Japan/East Sea between 1958 and 2003 increased to their peak (1.76 million tons) in the late 1980s and decreased abruptly with the collapse of Japanese sardine. Catch results for 58 fisheries and various environmental time-series data sets and community indices, including mean trophic level (MTL) and Simpson’s diversity index (DI), were used to investigate the impacts of fishing and climate changes on the structure of the fish community in the Tsushima warm current (TWC) region of the Japan/East Sea. The long-term trend in fisheries production was largely dependent on the Japanese sardine that, as a single species, contributed up to 60% of the total production in the Japanese waters of the Japan/East Sea during the late 1980s. Excluding Japanese sardine, production of the small pelagic species was higher during 1960s and 1990s but lower during 1970s and 1980s. This variation pattern generally corresponds with the trend in water temperature, warmer before early 1960s and after 1990s but colder during 1970s and 1980s. The warm-water, large predatory fishes and cold water demersal species show opposite responses to the water temperature in the TWC region, indicating the significant impact of oceanic conditions on fisheries production of the Japan/East Sea. Declines in demersal fishes and invertebrates during 1970s and 1980s suggested some impact of fishing. MTL and DI show a similar variation pattern: higher during 1960s and 1990s but lower during 1970s and 1980s. In particular, the sharp decline during the 1980s resulted from the abundant sardine catches, suggesting that dominant species have a large effect on the structure of the fish community in the Japan/East Sea. Principal component analysis for 58 time-series data sets of fisheries catches suggested that the fish community varied on inter-annual to inter-decadal scales; the abrupt changes that occurred in the mid-1970s and late 1980s seemed to correspond closely with the climatic regime shifts in the North Pacific. These results strongly suggest that the structure of the fish community in the Japan/East Sea was largely affected by climatic and oceanic regime shifts rather than by fishing. There is no evidence showing “fishing down food webs” in the Japan/East Sea. However, in addition to the impacts of abrupt shifts that occurred in the late 1980s, the large predatory and demersal fishes seem to be facing stronger fishing pressure with the collapse of the Japanese sardine.  相似文献   

胶州湾异养细菌及大肠菌群的分布及对陆源污染的指示     

赵三军  肖天  李洪波  徐剑虹 《海洋与湖沼》2005,36(6):541-547

2002年2月—2004年11月对胶州湾异养细菌和大肠菌群进行长期调查发现,胶州湾异养细菌丰度在105—106cells/ml之间,其中河口区域和近岸区域数量较高,其它区域相对较低。从季节上来看,夏季、秋季细菌丰度较高(分别为7.4×105、7.2×105cells/ml),冬季和春季丰度较低(分别为4.1×105cells/ml、5.9×105cells/ml),且在一年内呈现出一定的规律性波动。从季节尺度上看异养细菌丰度与温度呈现很好的正相关性(R=0.54)。对大肠菌群的研究表明,河口区域的大肠菌群数量显著高于其它区域,并且河口区域大肠菌群常年处于严重超标状态(最高为1.1×106cells/L,超过国家前三类水质标准的100倍)。根据大肠菌群的数量状况可以将胶州湾分为三个区域,即严重污染区、中度污染区和轻度污染区。该区域划分与通过营养盐对胶州湾区域的划分(富营养区、中度营养区、贫营养区)结果一致。  相似文献   

生物胺对锯缘青蟹大颚器发育的调节作用   总被引：1，自引：0，他引：1       下载免费PDF全文

叶海辉  李少菁  李祺福  黄辉洋  王桂忠 《海洋科学》2003,27(4):35-37

雌性锯缘青蟹(Scylla serrata)于实验的第1天、第5天、第10天，分别注射100μL剂量为1μg／g体质量的5-HT，OA和DA，第15天解剖。结果表明，5-HT对锯缘青蟹大颚器发育具有显的促进作用，OA和DA的作用不明显。经免疫细胞化学检测，大颚器内存在5-HT免疫阳性细胞，免疫阳性细胞多数为卵圆形，少数具有很长的胞突，该结果首次为5-HT参与大颚器的生理活动提供了形态学证据。  相似文献   

UV-B辐射增强对泥鳅红细胞遗传毒理学指标的影响研究     

李美芹  肖慧  唐学玺 《中国海洋大学学报(自然科学版)》2007,37(3):453-456,448

利用红细胞微核和核异常的遗传毒理学方法,研究UV-B辐射增强对泥鳅红细胞核的细胞遗传毒性效应,评价2种毒理学指标在UV-B辐射监测应用中的可行性。结果显示,随着UV-B辐射剂量的加大,泥鳅红细胞的微核细胞率持续上升,表现出明显的剂量-效应关系,微核细胞率与辐射剂量显著正相关。而泥鳅红细胞核异常率随着UV-B辐射剂量的加大无规律性的变化,没有表现出剂量-效应关系,核异常率与辐射剂量无相关性。脱离UV-B辐射处理6 d后泥鳅红细胞的微核细胞率不能够恢复正常的对照水平,而核异常细胞率随着时间的延长,逐渐得以恢复。结果指示泥鳅红细胞微核率是用于UV-B辐射监测的灵敏和可行的细胞遗传毒理学指标,而核异常率不能用于UV-B辐射的监测。  相似文献   

中国沿海亚历山大藻(Alexandrium)核糖体rDNA部分序列分析及该藻属分子系统进化研究   总被引：4，自引：1，他引：4  

唐祥海  于仁成  颜天  王云峰  周名江 《海洋与湖沼》2006,37(6):529-535

分析了几株自南海及东海分离的亚历山大藻的rDNA部分序列信息,其中包括核糖体大亚基(LSU)rDNA的5′端D1-D2区序列,以及5.8SrDNA和ITS区序列;同时也对实验室保种的部分来自其它国家和地区的亚历山大藻相关序列进行了测序和分析,并以此作为序列分析中的参考。采用ClustalX及MEGA2软件对所得到的序列信息进行了综合分析与对比。结果表明,分离自南海的塔玛亚历山大藻(Alexandriumtamarense)和分离自东海的链状亚历山大藻(A.catenella),即便是在ITS区和LSUrDNA等高变区,其序列信息也完全一致。与基因库中搜索到的其它亚历山大藻rDNA序列信息相比较,中国沿海的塔玛/链状亚历山大藻序列更接近于塔玛复合种的“亚洲温带”基因型。对于分离自南海的另外两株未定种的亚历山大藻,通过对比序列信息,发现它们与相关亚历山大藻(A.affine)非常接近。分离于我国台湾地区的微小亚历山大藻(A.minutum)在序列上与分离自新西兰的藻株相似,而与分离自欧洲的微小亚历山大藻藻株相差较大。中国沿海亚历山大藻rDNA序列信息的获得为针对有毒藻种设计特异性核酸探针,发展灵敏快速的生物检测技术奠定了基础。  相似文献   

水下自航式海洋观测平台技术发展研究   总被引：3，自引：2，他引：3  

惠绍棠 《海洋技术学报》2001,20(4):11-17

水下自航式海洋观测平台是一种新型海洋观测平台，主要用于无人、大范围、长时间水下环境监测，包括物理学参数、海洋地质学和地球物理学参数，海洋化学参数、海洋生物学参数及海洋工程方面的现场接近观测。其特点是：成本低，环境适应性强，可冲破人工潜水极限而进入现场进行接近观测，免除了ROV需要水面支援母船的累赘，减少作业经费，体积小，使用方便，便于布放回收；可根据水声信号摇控或预置程序控制，按要求进行相关项目观测；有自主动力，水下运行时间相对较长，有源噪声低，可进行隐弊观测，正是基于以上的优点，近几年颇得海洋环境监测和海军方面的青睐，本文介绍了国际上水下自动观测平台的发展历史和现状，提出了我国开展研究水下自动观测平台的重要性及研究的面容。  相似文献