Volunteer Ship Survey of Japan-Australia Oceanic Variability

在本财政年度，“朱庇特一号”号有一次到西澳大利亚的往返航行，两次到东澳大利亚的往返航行，6月份从欧洲回到日本后，还有一次到加拿大的往返航行。此后，她每三年进入新加坡的码头进行维修。在这个机会下，广岛大学的两名调查人员访问了新加坡的第一木星号，检查了舰载ADCP的现状，发现ADCP本身维护良好，而ADCP下方的塑料窗内储存了少量泥浆，无需任何维修即可使用。2000年2月20日至22日，广岛大学首席研究员和2名研究员访问了澳大利亚OSIRO海洋学分部，交换了新获得的观测资料并回顾了以往的研究。本会计年度的主要结果总结如下：(1)1999年1月资料中不存在北赤道逆流（NECC），但在1999年7月资料中，它以高能流的形式出现在3N左右。在1999年9 - 10月的数据中，NECC再次消失。(2)博索半岛以南的黑潮在1999年7月之前与海岸分离，1999年9 ~ 10月接近海岸。1999年10月，黑潮号的运输量显著增加。这种输送量的增加可能与1999年11月黑潮的大曲流有关(3)1999年1月北赤道流的轴线在14N，然后向10N偏移。

In this fiscal year, the M. V. First Jupiter had one round-trip cruise to western Australia, two round trip cruises to eastern Australia end one round-trip cruise to Canada after she came back to Japan from Europe in June. After that, she entered the dock in Singapore for maintenance every three years. At this chance, two investigators of Hiroshima University visited the First Jupiter in Singapore for examining the present status of the ship-mounted ADCP, and found that the ADCP itself was well maintained while a little of mud was stored inside the plastic window below the ADCP and can be used without any repair for coming operation. During February 20-22, 2000, the head investigator and two investigators of Hiroshima University visited the OSIRO Division of Oceanography, Australia for exchanging the observation data obtained newly and reviewing the previous research. The major results for this fiscal year are summarized as follows :(1) There was no North Equatorial Counter Current (NECC) in the data of January 1999, but it appeared around 3N as an energetic current in the data of July 1999. The NECC disappeared again in the September-October data of 1999.(2) The Kuroshio south of the Boso Peninsula was separated from the shore until July 1999 and close to the shore in September-October of 1999. The transport of the Kuroshio was remarkably increased in October 1999. This transport increase may be related to the large meander of the Kuroshio which took place in November 1999(3) The axis of the North Equatorial Current was placed at 14N in January 1999 and then shifted to 10N.