• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>IEEE/OES Acoustics in Underwater Geosciences Symposium >Acoustics characterization of micronekton spatial distribution in Indian Ocean using scientific surveys and integrated marine observing system database: Acoustics characterization of micronekton
【24h】

Acoustics characterization of micronekton spatial distribution in Indian Ocean using scientific surveys and integrated marine observing system database: Acoustics characterization of micronekton

机译：使用科学调查和综合海洋观测系统数据库对印度洋微浮游生物空间分布进行声学表征：微浮游生物的声学表征

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In this work scientific echosounder were used hull mounted onboard R/V Marion Dufresne II to scrutinize the vertical distribution of micronekton according to water masses characteristics along transect which were discriminated with spatial remote sensing data. Acoustic data were collected continuously at 38 kHz frequency during eighteen transits carried out in the South-West Indian Ocean (20???60??S, 50???80??E) between 2010 and 2014. The data set used includes scientific and opportunistic fishing surveys from Integrated Marine Observing System database. A structure in three main depth layers i.e., "surface", "intermediate" and "deep", has been found continuously all along the survey. Changes of micronektonic vertical structure were investigated along North South latitude: the surface layer acoustic density and thickness decrease by going southward. The intermediate layer is generally almost empty except between 30??S and 40??S. The deep layer acoustic density increases from North to South but its thickness does not change significantly. To assess the importance of these vertical changes, a spatially constrained clustering was applied on acoustic data and a positive correlation was established between vertical acoustic organization and oceanographic fronts' position. We conclude that spatial organization of micronekton is structured depending on water masses and confirm the interest of collecting acoustic data from fishery vessels to complete scientific surveys that are often restricted in time and space.
机译：在这项工作中，根据安装在R / V Marion Dufresne II船体上的船体使用了科学回声测深仪，根据沿断面的水团特征（通过空间遥感数据进行了区分）来研究微结节的垂直分布。在2010年至2014年期间，在西南印度洋（20 ??? 60？S，50 ??? 80？E）进行的18次转换中，以38 kHz的频率连续收集了声学数据。所使用的数据集包括综合海洋观测系统数据库中的科学和机会性捕鱼调查。在整个调查过程中，连续发现了三个主要深度层的结构，即“表面”，“中间”和“深层”。沿北北纬度研究了微声波垂直结构的变化：表层的声密度和厚度向南减小。中间层通常几乎是空的，除了在30 SS和40 SS之间。深层声密度从北向南增加，但其厚度变化不大。为了评估这些垂直变化的重要性，在声学数据上应用了空间受限的聚类，并且在垂直声学组织与海洋学前沿位置之间建立了正相关。我们得出的结论是，微鱼群的空间组织取决于水团，并确认有兴趣从渔船收集声波数据以完成通常在时间和空间上受到限制的科学调查的兴趣。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号