南海南部NS93-5孔沉积物磁化率特征及其对全球气候变化的记录   总被引：21，自引：1，他引：21  

杨小强  李华梅  周永章 《海洋地质与第四纪地质》2002,22(1):31-36

对南海南部长533cm的NS－93孔连续采取423块样品，测量低场下的质量磁化率。并间隔取样202块，测量ARM。通过与沉积层序、氧同位素和矿物特征对比分析，我们认为NS－93孔磁化率的变化主要受控于外源磁性矿物浓度的变化，其值的高低与沉积物中碎屑矿物的含量相关，与碳酸盐的含量反相关，说明碳酸盐矿物对磁性矿物浓度具有稀释作用。在磁化率特征变化曲线上，与氧同位素阶段和Heinrich变冷事件、D－O旋回有好的对应关系。磁化率的相对高值与氧同位素奇数阶段和气候的暖期相对应，而相对低值则与气候冷期对应。这一规律反映了东亚季风、大洋环流强弱和陆源碎屑输入对沉积物磁化率的控制作用。同时，从ARM和磁化率的关系分析，南海南部在氧同位素阶段6沉积时期处于相对稳定的环境，南面的Borneo海峡可能是封闭的。  相似文献   

Ocean Color Satellite Imagery and Shipboard Measurements of Chlorophyll a and Suspended Particulate Matter Distribution in the East China Sea   总被引：1，自引：0，他引：1  

Yoko Kiyomoto  Kazuo Iseki  Kazumaro Okamura 《Journal of Oceanography》2001,57(1):37-45

Satellite-derived ocean color data of Coastal Zone Color Scanner (CZCS) on board the Nimbus-7 and Ocean Color and Temperature Scanner (OCTS) on board the Advanced Earth Observing Satellite (ADEOS) are jointly used with historical in situ data to examine seasonal and spatial distributions of chlorophyll a (Chl-a) and suspended particulate matter (SPM) concentrations in the East China Sea. Ocean color imagery showed that Chl-a concentrations on the continental shelf were higher than those of the Kuroshio area throughout the year. Satellite-derived Chl-a concentrations are generally in good accordance with historical in situ values during spring through autumn (although no shipboard in situ measurement was conducted at nearshore areas). In contrast, ocean color imagery in winter indicated high Chl-a concentrations (4–10 mg m^–3) on the continental shelf where bottom depth was less than 50 m when surface water was turbid (2–72 g m^–3 of SPM at surface), while historical in situ values were usually less than 1 mg m^–3. This suggests that resuspended bottom sediment due to wind-driven mixing and winter cooling is responsible for the noticeable overestimation of satellite-derived Chl-a concentrations. The algorithm for ocean color needs to be improved urgently for turbid water.  相似文献   

Atmospheric input of trace elements to the western Pacific Ocean and the Kuroshio ocean area     

Qian Fenlan  Yu Hongjian  Lan Youchang  Chen Zhi  Zhou Mingyu  Farn Parungo  Wu Peiming 《海洋学报(英文版)》1996,15(1):69-84

ＡｔｍｏｓｐｈｅｒｉｃｉｎｐｕｔｏｆｔｒａｃｅｅｌｅｍｅｎｔｓｔｏｔｈｅｗｅｓｔｅｒｎＰａｃｉｆｉｃＯｃｅａｎａｎｄｔｈｅＫｕｒｏｓｈｉｏｏｃｅａｎａｒｅａ￥ＱｉａｎＦｅｎｌａｎ；ＹｕＨｏｎｇｊｉａｎ；ＬａｎＹｏｕｃｈａｎｇ；ＣｈｅｎＺｈｉ；Ｚｈｏｕ...  相似文献   

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   

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   

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

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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   

海水现场水色色度及渤海水域水色色度分析     

张绪琴  张世魁 《海洋科学进展》2001,19(3):76-81

叙述了目前海水现场水色测量的弊端 ,指出数字化海洋水色的潜在应用价值 ;根据色度学及色度学的三原色基本理论 ,确定海洋现场水色的色度要素 ,使海洋现场水色标号统一为物理学中严格的颜色物理量。结合 1 996年渤海水域光谱反射测量 ,对渤海水域 4个典型站位的反射光谱做了水色色度分析 ,并进行了 2种测量方法的比较  相似文献