Study on the Boundary Mixing and Intrusion of Shelf Water into the Intermediate Layr of the Kuroshio around the Continental Shelf Break

1995年11月10日至12日，对东海陆架断裂附近大陆架横断面的温度、盐度和浊度垂直剖面进行了观测。在大多数测量站的底部上方检测到高浊度水。斜坡区中层有较高浊度水，沿剖面等平面分布，表明陆架底部上方的高浊度水可能侵入黑潮。从1996年11月的短间隔观测点观测中，发现了明显的陆架区低盐度水侵入黑潮的证据。然而，在1996年，低盐度水的起源似乎不是在陆架底部附近，而是在陆架区域的表面层附近，并且侵入水的浊度没有明显区别。黑潮下游5英里的两个剖面间入侵构造变化不大，表明入侵沿陆架规模至少大于10公里。另一项测量是在冰架断裂周围250米水深处用海流计探测到几种时间尺度的内波。1995年11月系泊2天，采样间隔1分钟，在距底120和60米的海流处，间歇地观察到内潮、10 ~ 30分钟几个周期的短时间尺度内波以及较短时间尺度的湍流波动。虽然内波与湍流或垂直混合的关系尚不清楚，但上述侵入可能是由于湍流的频繁发生或小尺度内波的破碎而产生的。

During 10 to 12 November, 1995, vertical profiles of temperature, salinity and turbidity were obtained along a cross-shelf section near the continental shelf break in the East China Sea. High turbidity water was detected just above the bottom at most of the measuring stations. And relatively high turbidity water could be detected in the intermediate layr of the slope region, which distributed along an isopycnal surface on the section, suggesting that the high turbidity water just above the bottom of the shelf should intrude into the Kuroshio. From the observations with short spacing in observation points in November, 1996, it was found that distinct evidence of intrusion of low salinity water from the shelf area into the Kuroshio. However, in 1996, origin of the low salinity water seemed to not be located near the bottom of the shelf but originated around surface layr in the shelf region, and there were no significant distinction in turbidity in the intruded water. The structure of the intrusion did not change so much between two sections with 5 miles distance in down stream direction of the Kuroshio, which indicated that the along-shelf scale of the intrusion would be larger than 10 km at least.Another measurements with current meters moored at 250m water depth around the shelf break detected internal waves with several kinds of time scale. In two days mooring with 1 minute sampling interval in November 1995, internal tide, short time scale internal waves with the several periods from 10 to 30minutes along with shorter time scale turbulent fluctuations were seen intermittently from current meters at 120 and 60m above the bottom. Although it was not clear how the internal waves related to turbulence or vertical mixing, above mentioned intrusion could be generated by frequent occurrence of turbulence or breaking of small scale internal waves.