Quantitative evaluations of ocean circulation and meridional themohaline transport in the Indian sector of Antarctic

南极印度段海洋环流和经向温盐输送的定量评估

• 批准号: 17340138
• 负责人: WAKATSUCHI Masaaki
• 金额: $ 10.74万
• 依托单位: Hokkaido University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17340138/
• 关键词: Ocean Circuation; Antarctic Ocean; Meridional Thermohaline Transport; Antarctic Bottom Water; Coastal Polynya; Variability of Sea-Ice Extent; Climatic Change; Earth Environment; 南極低層水

The purpose of this study is to make an analysis of our observational data in which the seasonal variability of volume transport for the northward flowing Antarctic Bottom Water in the Indian sector of the Antarctic could be successfully obtained for the first time. We have done the deployment of the current-mooring systems at 8 stations off the southeastern coast of the Kerguelen Plateau for two years from February 2003 to January 2005, as an international joint project together with CSIRO in Australia. Our primary data analyses have shown that this region has completely reverse current direction over the continental shelf slope and the far offshore; the former is northwestward flow while the latter is southeastward flow. Therefore, the water circulation system in this region is approximately composed of the northward flow as a western boundary current and southward flow due to the cyclonic recirculation.In this study, we have also derived the sea-ice thickness distribution in the coastal polynyas where are the formation areas of the Antarctic Bottom Water, using the SSMI microwave data. From the data analyses and heat-budget calculation, we also have successfully made the mapping of the amount of sea-ice production in the coastal polynyas. According to our study, the area of the largest amount of sea-ice production in the Antarctic is Ross Sea. However, the amount of the sea-ice production in the coastal polynyas of the Ross Sea decreases about 30% during the period from 1990's to 2000's; this may lead to the recent trend of the freshening of the Antarctic Bottom Water.Although we did not yet make all the data analyses, we will propose water circulation system in the Indian Ocean sector of the Antarctic quantitatively, in the nearfuture.

本研究的目的是对我们的观测资料进行分析，首次成功地获得了南极印度区向北流动的南极底层水体积输送的季节变化。作为与澳大利亚CSIRO合作的国际联合项目，我们从2003年2月至2005年1月在Kerguelen高原东南海岸的8个站点部署了海流系泊系统。初步资料分析表明，该海域陆架坡区与远岸区的海流方向完全相反，前者为西北向流，后者为东南向流。因此，该地区的水循环系统大致由作为西边界流的北向流和由于气旋性再循环引起的南向流组成。通过资料分析和热量收支计算，我们还成功地绘制了沿海冰穴海冰生成量图。根据我们的研究，南极海冰生成量最大的地区是罗斯海。然而，在20世纪90年代至21世纪初，罗斯海沿岸冰槽的海冰产量减少了约30%，这可能导致了南极底层水最近的淡化趋势。虽然我们还没有对所有的数据进行分析，但在不久的将来，我们将定量地提出南极印度洋区的水循环系统。

项目成果

Sea ice thickness in the southwestern Sea of Okhotsk revealed by a moored ice‐profiling sonar

• DOI: 10.1029/2005jc003327
• 发表时间: 2006-09
• 期刊: Journal of Geophysical Research
• 作者: Y. Fukamachi;G. Mizuta;K. Ohshima;T. Toyota;N. Kimura;M. Wakatsuchi

Deceased surface salinity in the Sea of Okhotsk during the last glacial period estimate from alkenones

根据烯酮估算末次冰河期鄂霍次克海表面盐度下降

• 发表时间: 2005
• 期刊: Geophys.Res.Lett 32 L08710
• 作者: Seki;O.;K.Kawamura;T.Sakamoto;M.Ikehara;T.Nakatsuka;M.Wakatsuchi
• 通讯作者: M.Wakatsuchi

Deep western boundary current and southern frontal systems of the Antarctic Circumpolar Current southeast of the Kerguelen Plateau

• DOI: 10.1029/2007jc004627
• 发表时间: 2008-08
• 期刊: Journal of Geophysical Research
• 作者: S. Aoki;N. Fujii;S. Ushio;Y. Yoshikawa;S. Watanabe;G. Mizuta;Y. Fukamachi;M. Wakatsuchi

Water mass exchange and diapycnal mixing at Bussol' Strait revealed from the water mass property

从水团特性揭示布索尔海峡的水团交换和二重混合

• 发表时间: 2007
• 期刊: J. Oceanogr. 63
• 作者: Ono;K.;K. I. Ohshima;T. Kono;M. Itoh;K. Katsumata;Y. N. Volkov and M. Wakatsuchi
• 通讯作者: Y. N. Volkov and M. Wakatsuchi

沿岸ポリニヤでの海氷生産量とりンクする、オホーツク海中層水の経年変動

鄂霍次克海水的长期变化与沿海冰间湖海冰的产生有关

• 发表时间: 2008
• 作者: 大島慶一郎;若土正曉 他3名
• 通讯作者: 若土正曉 他3名