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Study on formation and modification prrocesses of the North Pacific Intermediate Watrer

北太平洋中层水域形成与改造过程研究

基本信息

批准号：
07454111
负责人：
NAGATA Yutaka
金额：
$ 3.52万
依托单位：
Mie University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07454111/
关键词：
North Pacific Intermediate Water formation of intermediate water circulation of intermediate water subsidence of surface water Soya Warm Water Okhotsk Sea Tsugaru Warm Water world climate change 亜寒帯海域中層水の生成中層水の循環宗谷暖水津軽暖水世界気候

项目摘要

Relating the global climate change of decade scale, the formation and modification processes of the North Pacific Intermediate Water attract interest of many investigators. The head investigator reviewed the oceanic condition of the Okhotsk Sea, and published "the Okhotsk Sea and its adjacent areas" as a scientific report of PICES (North Pacific Marine Science Organization) and organized the workshop on the Okhotsk Sea in Vladivostok in 1995, and emphasized the importance of the its northwestern shelf region as the formation area of the heavy water capable for an origin of the Intermediate Water. We analyzed the salinity balance in this shelf regions and showed that the tidal mixing over the Kashevrov Bank plays important role in formation and modification processes of the source water of the Intermediate Water. The source water travels southward after it goes out into the Pacific Ocean, and reaches to the Mixed Water Region where the water obtains the nature of the Intermediate Water. We analyzed this area, and showed that the Tsugaru Warm Water could play considerable effect on modification mechanism. The difference of the water mass between north and south of the Izu Ridge is also investigated. We tried to simulate the recent observational knowledges in the numerical models, too. Besides, we analyzed abnormally saline water which is found above the main themocline off the Kii Peninsula. The horizontal intrusions of the less saline water such as the North Pacific Intermediate Water and of the abnormally saline water appear to illustrate the circulations of the intermediate waters.

北太平洋中层水的形成和改造过程与全球十年尺度的气候变化密切相关，引起了许多研究者的兴趣。首席研究员审查了鄂霍次克海的海洋状况，并发表了“鄂霍次克海及其邻近地区”作为PICES（北太平洋海洋科学组织）的科学报告，并于1995年在海参崴组织了关于鄂霍次克海的研讨会，并强调了其西北大陆架地区作为能够形成中层水的重水形成区的重要性。我们分析了该陆架区的盐度平衡，表明Kashevrov银行的潮汐混合在中间水的源水的形成和修改过程中起着重要的作用。源水流出太平洋后向南流动，到达混合水域，在那里水获得中间水的性质。通过对这一区域的分析，发现津轻温水对改性机理有较大的影响。同时，还探讨了伊豆海脊南北水团的差异。我们也试图在数值模式中模拟最近的观测知识。此外，我们还分析了纪伊半岛主温跃层之上的异常盐水。北太平洋中层水和异常盐水的水平侵入似乎说明了中层沃茨的环流。