珠江口近30a的SST变化特征分析   总被引：5，自引：0，他引：5  

汤超莲  郑兆勇  游大伟  邓松  黄亚如 《台湾海峡》2006,25(1):96-101

根据珠江口多个定点站近30a表层海水温度（SST）实测资料和气象站观测的气温资料，使用功率谱和小波分析方法，计算分析珠江口SST变化特点、上升趋势及其与El Nino／La Nino的响应关系．结果表明各月SST存在着1-2℃的海域差异，SST的年较差达10～11℃，SST的季节变化与全球气候变暖呈显著相关．1971-2003年SST呈显著上升趋势，其线性上升率为0．019～0．034℃／a，且珠江口外高于口内．El Nino／La Nino事件对珠江口SST变化的影响并非单一的对应关系．  相似文献   

Satellite detection of red tide in Ariake Sound, 1998–2001     

Joji Ishizaka  Yasuhisa Kitaura  Yasuharu Touke  Hiroaki Sasaki  Akihiko Tanaka  Hiroshi Murakami  Toshikazu Suzuki  Kazumi Matsuoka  Hideaki Nakata 《Journal of Oceanography》2006,62(1):37-45

High resolution SeaWiFS data was used to detect red tide events that occurred in the Ariake Sound, Japan, a small embayment known as one of the most productive areas in Japan. SeaWiFS chlorophyll data clearly showed that a large red tide event, which damaged seaweed (Nori) cultures, started early in December 2000 in Isahaya Bay, expanded to the whole sound and persisted to the end of February 2001. The monthly average of SeaWiFS data from May 1998 to December 2001 indicated that the chlorophyll peaks appeared twice a year, in early summer and in fall, after the peaks of rain and river discharge. The SeaWiFS data showed that the red tide event during 2000–2001 winter was part of the fall bloom; however, it started later and continued significantly longer than other years. Satellite ocean color data is useful to detect the red tide; however the algorithms require improvement to accurately estimate chlorophyll in highly turbid water and in red tide areas.  相似文献   

Local remineralization patterns in the mesopelagic zone of the Eastern North Atlantic, off the NW Iberian Peninsula     

C.G. Castro  M. Nieto-Cid  X.A. lvarez-Salgado  F.F. Prez 《Deep Sea Research Part I: Oceanographic Research Papers》2006,53(12):1925-1940

The short-time-scale variability of the remineralization patterns in the domain of Eastern North Atlantic Central Waters (ENACW) off the NW Iberian Peninsula is studied based on biogeochemical data (oxygen, nutrient salts, total alkalinity, pH, dissolved organic matter and fluorescence of dissolved humic substances) collected weekly between May 2001 and April 2002. The temporal variability of inorganic variables points to an intensification of remineralization during the summer and autumn, with an increase of nutrients, total inorganic carbon and fluorescence and a decrease of oxygen. During the subsequent winter mixing, there is a biogeochemical reset of the system, with lower nutrients, total inorganic carbon and fluorescence and higher oxygen. In contrast to inorganic variables, the levels of dissolved organic matter in the ENACW seem to respond to short-term events probably associated with fast sinking particles, where solubilisation of organic matter prevails over remineralization. Applying a previously published stoichiometric model, we observed a vertical fractionation of organic-matter remineralization. Although there is a preferential remineralization of proteins and P compounds in the entire domain of ENACW, the percentage was higher in the upper ENACW (σ<27.10 kg/m³) than in the lower; the percentage of N and P compounds in the oxidised organic matter was >80% for the upper ENACW and 63% for the lower. Likewise, the redissolution of calcareous structures contributes about 6% and 13% to the carbon regenerated in the upper and lower layers of ENACW, respectively.  相似文献   

北太平洋海面异常风场的时空分布特征与海气热量交换     

王志联  许乃猷  徐启春 《中国海洋大学学报(自然科学版)》1995,(1)

用北太平洋（含赤道太平洋区）１９４９～１９７９年的ＣＯＡＤＳ资料，通过矢量ＥＯＦ分解得到北太平洋异常风场的分布型及其时间变化规律。分析表明，ＥＯＦ１～５场与大气活动中心、海洋相互作用有联系，具有明显的天气学意义。此外，还讨论了ＥＯＦ异常风场间的转换及其季节性差异。  相似文献   

Fractal Dimension and Fractals in Ocean Engineering   总被引：4，自引：0，他引：4  

Fu Yuhua Senior Engineer  China Offshore Oil Engineering Corporation  P. O. Box  Beijing 《中国海洋工程》1994,(3)

- This paper discusses the application of fractal dimension and fractals in ocean engineering. To handle some ocean environment problems, the existing fractal method, in which the fractal dimension is a constant, can be used. For some complicated problems in ocean engineering, this paper presents the concept of the variable dimension fractals (D = f(r)), i. e., the fractal dimension D is the function of characteristic scale r instead of a constant. By using variable dimension fractals, several deformation and stress states of offshore structures are described.  相似文献   

南海上层海洋热含量的年际和年代际变化   总被引：1，自引：0，他引：1  

何有海  关翠华 《热带海洋学报》1997,(1)

分析了1959—1988年南海表面至100m垂直平均温度（TAV）资料，结果表明：南海上层海洋热含量存在明显的准两年、4—5年和年代际振动。在E1Nino年，南海上层热含量显著增加。50年代末至70年代初，南海TAV为负距平，此后转为正距平。南海TAV的变化与ENSO事件、东亚冬季风和热带大气环流的变异密切相关。  相似文献   

Atlantic salmon ranching: past problems and future management     

Isaksson  A.; Oskarsson  S.; Einarsson  S. M.; Jonasson  J. 《ICES Journal of Marine Science》1997,54(6):1188-1199

  相似文献   

漳州地区热田的水热活动及其成因   总被引：1，自引：0，他引：1  

柯龙生 《台湾海峡》1997,16(1):21-27

本文通过漳州地热田及其周围地区的水热活动、地质构造特征及人工爆破、重力、地磁、电性结构、地震活动性等综合地球物理场之间关系分析，得出漳州地热田是高热异常背景下产生的对流型水热系统：深切到上地幔的ＮＥ向长乐－南澳断裂、ＮＷ向九龙江断裂及Ｅ－Ｗ向南靖－厦门断裂控制了地下水的深循环，使大气降水得以下渗到〉３ｋｍ深度，被地温加热并富集起来，在静水压力作用下沿通道－断裂带的交汇部位上涌。热田区破碎的岩石导致  相似文献   

人造海洋涌升流和海洋渔场   总被引：1，自引：0，他引：1  

李冠成  王秉坤  李明  范喆  王莉  卢佃清 《海洋技术学报》2003,22(2):74-78

针对渔业资源日趋减少和鱼产品需求不断增加的矛盾，探讨了建造海底山脉、人工制造海洋涌升流、从而人工制造优良海洋渔场的可行性，分析了我国建造海底山脉的水深、海底和海流条件。介绍了建造海底山脉的建筑方法和国际上建造海底山脉的最新动态。论述了我国在200n mile以内建造海底山脉的有利条件。  相似文献   

全球海洋与大气界面的熵通量估算     

严幼芳  甘子钧  齐义泉 《热带海洋学报》2004,23(6):60-68

给出并讨论了海洋系统中由于热量交换、物质交换以及外力做功引起的熵通量的表达式;同时,根据新近调整的全球海 气界面的气候平均资料,估计了全球海洋与大气界面气候年平均的熵通量(熵流),这一熵通量主要取决于海 气界面的热量和物质交换的空间不均匀性。计算结果显示,由热量交换分量引起的熵通量对海洋系统的总熵通量起到主要的贡献作用,其值约为-555.6mW·(m2·K)-1;由海表风应力做功引起的熵通量相对较小,约为-0.09mW·(m2·K)-1;由物质交换引起的熵通量最小,仅为-0.02mW·(m2·K)-1。总的来说,海洋系统从外界获得的总熵通量为-555.7mW·(m2·K)-1,这也就意味着在气候平均定态下,海洋系统内部的熵产生在量值上等于系统的熵交换,即为555.7mW·(m2·K)-1。海洋系统的负熵流与其内部的各种不可逆过程引起的熵产生取得平衡,确保了全球海洋系统处于非平衡热力学定态,并维持着海洋系统中各种尺度的时 空有序现象的消长过程。  相似文献