Kuroshio Frontal Eddy in the East China Sea

为了弄清黑潮锋面涡的详细结构，1996年至2000年在东中国海陆架边缘进行了4次现场观测。在一周的时间里，每天通过陆架边缘进行CTD和ADCP观测，以阐明由于锋面涡旋而引起的水温、盐度、水流、浊度和营养物质的变化，结果表明，Kurosio锋面涡的波长为200公里，周期为10天，相速度为30厘米/秒。温暖的咸水通过这股涡流平流到岸边，冷淡的水平流到近岸。伴随着这种锋面涡旋，营养物质含量高的次表层黑潮水沿着陆架边缘上升并输送到陆架，黑潮锋面涡旋是由黑潮的斜压不稳定引起的。我们必须弄清黑潮锋面涡在东海中国海陆架水与黑潮水之间的水交换中的定量作用。

Four times field observations were carried out at the shelf edge of the East China Sea from 1996 to 2000 in order to clarify the detailed structure of the Kuroshio frontal eddy. CTD and ADCP observations were conducted across the shelf edge every day during one week to elucidate the variability of water temperature, salinity, current, turbidity and nutrients due to the passing of a frontal eddy.As a result, we can find that the Kurosio frontal eddy has a wave length of 200 km, a period of 10 days and a phase speed of 30 cm/sec. The warm and salty water is advected to the onshore side by this eddy and the cold and fresh water to the offshore side. Accompanying with this frontal eddy, the sub-surface Kuroshio water with high concentration of nutrients upwells along the shelf edge and is transported to the shelf.The Kurosio frontal eddy is geberated by the baroclinic instability of the Kuroshio. We have to clarify the quantitative role of the Kuroshio frontal eddy in the water exchange between the shelf water and the Kurosio water across the shelf edge of the East China Sea.