普里兹湾涡旋、上升流及水团对磷虾分布的影响

发布时间：2018-04-17 01:40

本文选题：涡旋 + 上升流　；参考：《大连海洋大学》2016年硕士论文

【摘要】：本文利用1992年到2014年的海面高度计数据,我国第29次南极考察CTD数据以及第31次南极考察ADCP数据来分析南极普里兹湾的涡旋、上升流以及水团的特点,结合29次南极考察的磷虾资源量信息,旨在研究普里兹湾物理海洋要素对南极磷虾资源分布的影响。基于观测数据信息,主要对普里兹湾内5个南北向断面进行对比分析。通过处理海面高度计数据,观测所绘制普里兹湾海表涡旋图可知涡旋的主要生成机制为海表风场,普里兹湾内常常出现独立且中心深度较大的冷涡或暖涡,同时,湾内海冰的消融时间常早于其他海域,故湾内可能存在上升暖流;通过分析CTD数据绘制的温盐等值线图发现5个断面都存在上升流,辅以ADCP数据绘制的断面流速矢量图,可知普里兹湾陆架坡折区常存在上升流;通过定性综合分析法、浓度混合分析法以及聚类分析法对普里兹湾水团进行的分析可知2013年南半球夏季普里兹湾共存在水团:夏季表层水、冬季陆架混合水、冬季冰架混合水、冰架水、绕极深层水和南极底层水,其中绕极深层水的南侵运动受陆坡阻碍常形成上升流,所以200米以浅海域也可发现绕极深层水的踪迹。分析磷虾资源量信息可知磷虾常趋向分布于陆架破折区且富含营养盐的暖水团中,这些暖水团通常由绕极深层水涌升而成。最终对应涡旋、上升流、水团以及磷虾资源量信息可知,以上物理海洋要素可直接影响磷虾的分布。
[Abstract]:Based on the sea surface altimeter data from 1992 to 2014, the CTD data from the 29th Antarctic expedition and the ADCP data from the 31st Antarctic expedition, the characteristics of vortex, upwelling and water mass in Prydz Bay, Antarctica, are analyzed in this paper.The effects of physical ocean elements of Prydz Bay on the distribution of Antarctic krill resources were studied based on the information of the resources of krill from 29 Antarctic expeditions.Based on the observational data, five north-south sections in Prydz Bay are compared and analyzed.By processing sea surface altimeter data, the observed surface vortex map of Prydz Bay shows that the main mechanism of vortex generation is sea surface wind field, and there are often independent cold or warm vortices in Prydz Bay with relatively deep center, and at the same time,The melting time of sea ice in the bay is usually earlier than that in other sea areas, so there may be rising warm current in the bay. Through the analysis of the warm and salt isoline map drawn by CTD data, it is found that there is upwelling current in all the five sections, supplemented by the velocity vector map of the section drawn by ADCP data.The upwelling is often found in the slope break of the Prydz Bay shelf.Concentration mixing analysis and cluster analysis of Prydz Bay water masses in the Southern Hemisphere in 2013 showed that there were water masses in the Prydz Bay in summer: surface water in summer, mixed water in continental shelf in winter, mixed water in ice shelf in winter, ice shelf water in winter.The circumpolar deep water and the Antarctic bottom water, in which the southward transgression of the circumpolar deep water is often blocked by the continental slope, often forms an upwelling current, so the trace of the circumpolar deep water can also be found in the shallow sea area of 200 meters.By analyzing the resource information of krill, it is found that krill tends to be distributed in warm water masses which are rich in nutrients in the broken area of continental shelf, and these warm water masses are usually formed by the upwelling of water around the very deep layer.According to the information of vortex, upwelling, water mass and krill resources, the above physical ocean elements can directly affect the distribution of krill.
【学位授予单位】：大连海洋大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：Q958.8;P731

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