摘要
本文应用 Simpson-Hunter 提出的潮混合形成浅水陆架锋的概念,讨论了黄海冷水团锋面及其它有关问题。用近最大潮流流速计算了黄海和东海北部的层化参量,得到划分层化和垂直均匀区的临界层化参量为1.8。在增温季节,整个黄海冷水团的边界是由潮混合控制的。夏季东海北部气旋型涡旋的西边界也由潮混合所控制。海面温度资料还表明:在强潮混合区外缘,存在着由潮混合引起的浅水海洋锋。
Since Simpson and Hunter proposed the i4ea that sfaialtofw water fronts were induced by tidal mixing in 1974,many authors have investigated the tidal induced shallow water fronts in various areas.It was generally assumed thalt a critical value of the stratified parameter K=log_(10)(H/U^(3))may foe used to identify the location of these fronts.Here,E means the depth of sea water,U denotes the characteristic velocity of tidal cuinrmt,and the critical value of K is generally taken as 1.8-2.0.In this paper,Simpson-Hunter’s stratified parameter K was calculated hy using quasi-maximum current velocity(which consists of the six main tidal constituents,i.e.M_(2),S_(2),O_(1),K_(1),M_(4)and MS_(4))in Huanghai Sea(Yellow Sea)and in the northern East China Sea as well.Calculated results show that the’areas of the Subei(the northern part of Jiangsu)Shoal,off the mouth area of Changjiang River,along the coast of Shandong Peninsula and along the western coast of Korea,the tidal mixing is strong.Calculations also show that along the whole boundary of HCWM and also along the western boundary of the cyclonic eddy in northern East China Sea,i.e.along the fronts,the value of K is found to be very close to the critical value 1.8.It is also to be noted that at these locations,the temperature of surface water is very low.These clearly show that shallow water fronts in Huanghai Sea and in the northern East China Sea as well,are induced by tidal mixing.
作者
赵保仁
Zhao Baoren(Institute of Oceanology,Academia Sinica,Qingdao)
出处
《海洋与湖沼》
1985年第6期451-460,共10页
Oceanologia Et Limnologia Sinica
