2011-2013年南黄海及东海北部海域营养盐分布规律研究

发布时间：2018-04-21 20:38

本文选题：南黄海 + 东海北部　；参考：《中国海洋大学》2014年硕士论文

【摘要】：本文利用国家重点基础研究发展（973）项目“海洋环境变化与水母暴发的相互作用”于2011年至2013年开展的7个航次调查获得的温度、盐度、营养盐资料开展针对春季、夏季和秋季的南黄海及东海北部海域的环流状况及营养盐分布等问题的研究。获得主要结论如下： 1.南黄海及东海北部海域各项营养盐含量分布整体表现为近岸高、远海低。营养盐分布具有明显季节特征。春季，表、底层营养盐含量差距不大。夏季，表层营养盐含量降低，并在南黄海中部底层出现营养盐高值区域。磷酸盐及硅酸盐在浙闽外海深层出现浓度高值区域。秋季，各营养盐高值区仍然存在，但分布范围及强度发生改变。不同季节硝酸盐均是DIN的主要组成部分，其次为氨氮，亚硝酸盐比重最低。硝酸盐含量最高值出现在夏季，显著高于春、秋季节，氨氮含量按季节排列由大到小依次为夏季、秋季、春季。 2.各营养盐受水文环流影响程度不同。各营养盐浓度均受长江冲淡水及黄海冷水团强烈影响。此外，DIN高值区受苏北沿岸流影响显著，，磷酸盐高值区受台湾暖流前缘水重要影响。长江冲淡水、台湾暖流、苏北沿岸流对近岸海域影响显著，黄海冷水团对南黄海中部深层海域影响强烈。 3.PN断面营养盐分布亦具有明显的季节变化。春季，断面营养盐含量较高。夏、秋季节，表层营养盐出现低值区域，随深度增加，营养盐含量逐渐上升，出现明显的营养盐跃层。跃层位置及强度与长江冲淡水及台湾暖流水有密切关系。 4.E断面营养盐分布具有明显的季节变化。调查时间内，断面整体呈现为表层含量低，底层含量高。春季，断面底层存在两个营养盐高值区。夏、秋季节，底层水体出现明显高营养盐区域，夏季，高值区域面积达到最大。营养盐分布与黄海冷水团等水文环流特征一致。 5.水体层化、垂向混合作用影响调查断面营养盐分布。营养盐分布季节变化与水体层化强弱及位置变化具有良好对应关系。
[Abstract]:In this paper, the temperature, salinity and nutrient data obtained from 7 cruising surveys conducted from 2011 to 2013 under the National key basic Research Development Project "interaction between Marine Environment change and Jellyfish outbreak" were carried out in spring. Studies on the circulation and nutrient salt distribution of South Huang Hai and the northern waters of the East China Sea in summer and autumn. The main conclusions are as follows: 1. The distribution of nutrient content in the south Huang Hai and the northern sea area of the East China Sea was high near shore and low in far sea. The distribution of nutrient has obvious seasonal characteristics. In spring, the difference of nutrient content in bottom layer is not big. In summer, the nutrient content of the surface layer decreased, and the high value area of nutrient salt appeared in the bottom layer of the middle part of South Huang Hai. Phosphate and silicate are found in high concentration areas in the deep sea off Zhejiang and Fujian. In autumn, the high value regions of nutrients still exist, but the distribution range and intensity change. Nitrate is the main component of DIN in different seasons, followed by ammonia nitrogen and nitrite. The highest nitrate content appeared in summer, which was significantly higher than that in spring and autumn. The order of ammonia nitrogen content was summer, autumn and spring. 2. Each nutrient is affected by hydrological circulation to different extent. All nutrient concentrations were strongly affected by the Yangtze River diluted water and Huang Hai cold water mass. In addition, the high value area of tin is significantly affected by the coastal current in northern Jiangsu, and the high value of phosphate is influenced by the leading water of Taiwan warm current. The Yangtze River diluted water, the Taiwan warm current, the northern Jiangsu coastal current have a significant influence on the coastal waters, and Huang Hai cold water mass has a strong influence on the deep sea area in the central part of South Huang Hai. The distribution of nutrient in 3.PN section also showed obvious seasonal variation. In spring, the nutrient content of cross section was higher. In summer and autumn, there were low value areas in the surface layer of nutrient salt. With the increase of depth, the content of nutrient salt gradually increased, and obvious nutrient cline appeared. The position and strength of the cline are closely related to the diluted water of the Yangtze River and the warm current of Taiwan. 4. The distribution of nutrient in section E has obvious seasonal variation. During the investigation time, the whole section showed low content of surface layer and high content of bottom layer. In spring, there are two high value areas of nutrient in bottom layer of cross section. In summer and autumn, there are obvious high nutrient areas in the bottom water, and the area of high value areas reaches the maximum in summer. The distribution of nutrients is consistent with the hydrological circulation characteristics of Huang Hai cold water mass. 5. Stratification and vertical mixing influence the distribution of nutrients in the investigation section. The seasonal variation of nutrient distribution has a good correspondence with the stratification intensity and position change of water body.
【学位授予单位】：中国海洋大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P734

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