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Clarification of Antarctic Bottom Water circulation in the Indian sector of Antarctic, particularly direct observation of its meridionall volume transport

澄清南极印度段的南极底水循环，特别是对其经向体积输送的直接观测

基本信息

批准号：
14403006
负责人：
WAKATSUCHI Masaaki
金额：
$ 8.45万
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：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

项目摘要

The Southern Ocean plays an important role on global climate through the directl heat and mass connections with Pacific Ocean, Atlantic Ocean and Indian Ocean. Especially, it is well known that the Antarctic Ocean is the largest seasonal sea ice zone in the world and produces the Antarctic Bottom Water (AABW) which is one of sources for general deep ocean circulation. In spite of its importance in earth sciences, there is very few direct observation for the meridional volume transport of AABW and its seasonal variations. It is widely believed that the AABW is produced in three coastal regions in the Weddell Sea, Ross Sea and off the Adelie coast. Recently, observational plans on the AABW formation are preceeded to have in the Weddell and Ross Seas by US and Europian oceanographers.The purpose of this study is to quantitatively evaluate the meridional volume transport of AABW (hereafter called to the Adelie AABW) which should be produced in the coastal polynyas off the Adelie coast by direct observations through a joint program with CSIRO in Australia. A recent result of numerical simulation on global ocean circulation suggests that the Adelie AABW may be the important source of Pacific and Indian Ocean deep water. We have deployed mooring systems with about 30 current meters and CT meters at 8 stations east of the Kerguelen Plateau for two years from February 2003 to February 2005, to observe the meridional volume transport of Adelie AABW as a werstern boundary current and its seasonal variations. We could successfully recover all the current and CT instrument mooring systems. We have now numerous valuable data. Since we fortunately could obtain a new research fund on ou study of the Adelie AABW formation, we are planning to progress analyzes of numerous and valuable data and would like to evaluate the meridional heat and volume transport of the Adelie AABW and its seasonal variability quantitatively.

南大洋通过与太平洋、大西洋和印度洋的直接热质联系，对全球气候起着重要作用。特别是众所周知，南极海洋是世界上最大的季节性海冰区，并产生南极底层水（AABW），这是一般深海环流的来源之一。尽管AABW在地球科学中具有重要意义，但对它的纬向体积输送及其季节变化的直接观测却很少。人们普遍认为，AABW产于威德尔海、罗斯海和阿德利海岸的三个沿海地区。近年来，美国和欧洲的海洋学家都计划在Weddell海和Ross海进行AABW的观测，本研究的目的是通过与澳大利亚CSIRO的联合计划，利用直接观测的方法，定量评估Adelie海岸附近的海湾中AABW（以下简称Adelie AABW）的经向体积输运。近年来全球海洋环流数值模拟的结果表明，阿德利大西洋岸桥可能是太平洋和印度洋深水的重要来源。从2003年2月至2005年2月，我们在凯尔盖朗高原以东的8个测站布设了约30个流速计和CT计的系泊系统，观测了Adelie AABW作为西边界流的纬向体积输送及其季节变化。我们可以成功地恢复所有的电流和CT仪器系泊系统。我们现在有很多有价值的数据。由于我们幸运地获得了一个新的研究基金，我们正在计划进行大量和有价值的数据分析，并希望定量评估阿德利AABW的纬向热量和体积输送及其季节变化。