A New Finding of Large-Scale Ocean Eddy in the Antarctic

南极大范围海洋涡旋的新发现

• 批准号: 03452059
• 负责人: WAKATSUCHI Masaaki
• 金额: $ 2.37万
• 依托单位: Hokkaido University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-03452059/
• 关键词: Ocean Eddy; Antarctic Divergence; Atmosphere-Sea Ice-Oean Interaction; Sea Ice Cover; Upwelling; Polynya; Antarctic Bottom Water formation; Remote Sensing; 南大洋; 巨大海洋渦; 海氷域変動; 南極底層水; 海洋深層大循環; 地球気候システム; 衛星情報

An oceanic structure of the Antarctic Divergence in the Indian Ocean sector was clarifiedon the basis of analysis of hydrographic data and drifting buoy data for Japanese cruises.The Antarctic Divergence is composed of a street of several cyclonic eddies with the orders of about 500 km in zonal length and about 200 km in meridional length. Part of the eastward flowing antarctic circumpolar Current meanders in the boundary regions between the eddies. The major factor which governs the formation and maintenance of the cyclonic eddies is the advection of two different kinds of waters into shallow and deep layrs of the eddy regions. The warm, saline circumpolar Deep Water advects into the shallow layr as upwelling whereas a cold and dense, coastal water advects into the deep layr as sinking along a relatively shallow ridge slope. The eddy formation recurs year after year though their locations slightly change ; the existence of ridges extending northward from the continental shelf region approximately governs the eddy formation in the selective locations. We found from geostrophical flow patterns and salinity distributions that a water exchange between coastal and offshore regions occurs through the circulation with both the eddies and the CDW meanders ; this also causes the meridional exchanges of heat and salt.

在印度洋部门，南极差异的海洋结构阐明了水文数据分析和日本巡航的浮标数据的基础。南极差异由几个旋风涡流组成，其街道由几个循环涡流组成，其订单的订单约为500 km，大约500 km的Zonal长度，大约200 km。涡流之间边界区域的向东流动的南极圆极电流蜿蜒曲折。控制旋风涡制的形成和维护的主要因素是将两种不同种类的水的对流进入涡流的浅层和深层。温暖的盐水圆极深水以上升流入浅层层，而沿着相对较浅的山脊斜坡下沉，沿着沿海的寒冷和浓密的沿海水流向深层。尽管其位置略有变化，但涡层年复一年。从大陆架区域向北延伸的山脊的存在大致控制了选择性位置的涡层。我们从地球流动模式和盐度分布中发现，沿海地区和近海地区之间的水交换是通过涡流和CDW曲折的循环发生的。这也导致热和盐的子午交换。

项目成果

Masaaki WAKATSUCHI,Kay I.OHSHIMA et al.: "Observations of large scale ocean eddies along the Antarctic Divergence" Proc.4th Int.Conf.Southern Hemisphere Meteorology and Oceanography. (1993)

Masaaki WAKATSUCHI、Kay I.OHSHIMA 等人：“南极辐散沿线大尺度海洋涡流的观测”Proc.4th Int.Conf.Southern Hemisphere Meteorology and Oceanography。

若土 正曉: "初めて見い出された南極域の巨大海洋渦" 日本海洋学会創立50周年記念大会講演要旨集. 154-155 (1991)

Masahiro Wakado：“首次在南极地区发现巨型海洋涡流”日本海洋学会 50 周年纪念会议摘要集 154-155（1991）。

岩土 正暁: "南極発散線(Antarctec Divergence)" 海洋科学(海洋出版). (1993)

岩户正明：《南极洲分歧》海洋科学（海洋出版社）（1993 年）。

Seelye MARTIN: "The Effect of Severe Storms on Ice Production in the Northern Tatarskiy Strait,Japan Sea" J.Geophys.Res.(1992)

Seelye MARTIN：“强风暴对日本海北鞑靼海峡产冰的影响”J.Geophys.Res.(1992)

若土 正曉: "南極域の巨大海洋渦と海氷分布特性" 第14回極域気水圏シンポジウム講演要旨集. 15-16 (1991)

Masahiro Wakado：“南极地区的巨大海洋涡流和海冰分布特征”第14届极地大气和水圈研讨会摘要15-16（1991）。