1.引言 PN断面位于琉球群岛西北方,是日本黑潮开发利用调查研究(KER,1977—1987年)所观测的诸断面之一。PN断面横跨两大水系,西侧是以低温、低盐为特征的大陆沿岸水(在本文中称为“陆架水”),东侧为来自太平洋的高温、高盐的黑潮水,构成了错综复杂的水文条件。另外,此处的地形也相当复杂,由陆架外缘、陆架坡折和陆坡组成。环境条件如此复 1. INTRODUCTION The PN cross-section is located in the northwestern Ryukyu Islands and is one of the sections observed by the Japan Kuroshio Research and Development Study (KER 1977-1987). The PN cross-section spans two major river systems, with continental shore water (referred to herein as “shelf water”) characterized by low temperature and low salt to the west and high temperature and high salt Kuroshio water from the Pacific Ocean to the east, Intricate hydrological conditions. In addition, the topography here is rather complicated, consisting of the outer edge of the shelf, the slope of the shelf and the slope. Environmental conditions so complex