Ecosystem and Oceanographic Structure in the Indian Sector of the Antarctic Ocean

T/V Umitaka-Maru 于 2002/03、2004/05、2005/06 夏季在南极洋印度区进行了 3 次航行。调查区域分别为克鲁盖朗高原东部陆架、威尔克斯地缘、卢佐夫-霍尔姆湾缘地、威尔克斯地缘和卢佐夫-霍尔姆湾缘地。主题是阿德利地外形成的深水循环、地表生态系统与物理和化学环境之间的关系以及地表生态系统与中层生态系统之间的关系。利用船载 ADCP、CTD 和 LADCP 进行水文观测，并从不同深度采样海水进行宏观营养盐和痕量金属分析。还进行了生物光学观测、初级生产测量以及通过浮游生物网收集表层浮游植物和浮游动物以及通过多次开闭拖网收集中层生物。气溶胶观测是在卢佐夫-霍尔姆湾附近进行的，与昭和站的观测一致。巡游过程中，从各港口拖曳一台连续浮游生物记录仪至观测区，结合R/V Aurora Australis和R/V Shirase采集的样本，研究表层浮游生物群落的长期变化。 迄今为止，已发表以下主题的论文：阿德利陆外深水形成的路径和体积；关于南极分歧点周围涡流和叶绿素和海冰年变化的遥感观测；通过定量回声测深仪精确估算南极磷虾生物量的参数。阐明了与南极分叉和南极绕极流曲流发展相关的140°E子午线浮游动物群落组成和生物量的年际变化，部分结果即将提交。对痕量金属、气溶胶和光合色素的分析仍在进行中。中层生物已被分类为主要类群，详细研究仍在进行中。较少的

Three cruises by T/V Umitaka-Maru were conducted in the Indian sector of the Antaractic Ocean in 2002/03, 2004/05, 2005/06 austral summer. Survey areas were the eastern shelf of Keruguelen plateau and off Wilkes Land, off Lutzow-Holm Bay and off Wilkes Land and off Luzow-Holm Bay, respectively. Main themes were the circulation of deep water formed off Adelie Land, the relationships between surface ecosystems and physical and chemical environments and the relationships between surface ecosystems and mesopelagic ecosystems. Hydrographic observations were conducted by using ship mount ADCP, CTD and LADCP, and seawater was sampled from various depths for macro-nutrient and trace metal analyses. Bio-optical observations, measurements of primary production and collections of surface phytoplankton and zooplankton by a plankton net and mesopelagic organisms by a multiple opening/closing trawl were also conducted. Aerosol observations were carried out off Luzow-Holm Bay, coincide with those fro … More m the Showa Station. A Continuous Plankton Recorder was towed during cruising from each port to observation area for the study on the long term change of surface plankton communities in combination with samples collected by R/V Aurora Australis and R/V Shirase.Until now, papers on following topics have been published : on the pathway and volume of deepwater formed off Adelie Land ; on the remote sensing observations of eddies and annual variability of chlorophyll and sea-ice around the Antarctic Divergence ; on the parameters for precise estimation of Antarctic Krill biomass by quantitative echo-sounder. Inter-annual changes in community composition and biomass of zooplankton along 140゜E meridian related to the development of the Antarctic Divergence and the meander of the Antarctic Circumpolar Current were elucidated and some of the results will be submitted soon. Analyses of trace metals, aerosols and photosynthetic pigments are still undergoing. Mesopelagic organisms have been sorted into major taxa and detailed studies are also still undergoing. Less