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

与全球十年尺度的气候变化相联系，北太平洋中层水的形成和修改过程引起了许多研究者的兴趣。首席调查员回顾了鄂霍次克海的海洋状况，发表了“鄂霍次克海及其邻近地区”作为北太平洋海洋科学组织(PICES)的科学报告，并于1995年在符拉迪沃斯托克组织了关于鄂霍次克海的研讨会，强调了鄂霍次克海西北陆架地区作为重水形成区的重要性，这些重水可能是中间水的来源。对该陆架区的盐度平衡进行了分析，结果表明，卡什夫罗夫浅滩的潮汐混合作用在中水源水的形成和改造过程中起着重要作用。水源水进入太平洋后向南流动，到达混合水区，具有中水性质。我们对这一区域进行了分析，结果表明，津格鲁温水可以在改性机理上起到相当大的作用。文中还对伊豆海脊南北水团的差异进行了研究。我们也试图在数值模式中模拟最新的观测知识。此外，我们还分析了在Kii半岛主温跃层上方发现的异常咸水。北太平洋中水等微咸水和异常咸水的水平侵入似乎说明了中水的循环。

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.