东海夏季跃层深度计算方法的比较  

A Study of Thermocline and Pycnocline Calculations in the East China Sea in Summer

作　　者：张媛[1] 吴德星[1] 林霄沛[1] 

机构地区：[1]中国海洋大学物理海洋实验室,山东青岛266003

出　　处：《中国海洋大学学报（自然科学版）》2006年第B05期1-7,共7页Periodical of Ocean University of China

基　　金：国家重点基础研究发展规划项目(2005CB422302;2005CB422303)资助

摘　　要：基于31°N和PN断面高分辨率的温度、盐度和密度(CTD)资料,分别选取1992,1998和2001年东海夏季长江径流量偏小、偏大和正常的3个年份,运用4种跃层计算方法计算了2个断面的温跃层和密度跃层上界的深度。计算结果与实际跃层上界深度比较发现,在3种不同条件下,采用垂向梯度法计算的东海夏季跃层上界深度,无论在浅海海区还是深海海区均较为理想。长江径流量偏小和正常的年份,在东海的浅海海区(水深<200m)运用S-T法计算的跃层上界深度与垂向梯度法的结果比较一致,都与实际跃层深度符合较好。在具有高分辨率资料的情况下,垂向梯度法是4种方法中计算东海夏季跃层上界深度的最佳方法。在缺乏高分辨率资料且长江径流量不大时,夏季东海浅海海区也可以运用S-T法计算温跃层和密度跃层上界深度。Based on the high-resolution CTD data of 1992, 1998 and 2001, the depths of the upper limit of thermocline and pycnocline are calculated by using four methods at the 31°N and PN transects in the East China Sea in summer. The results show that the depths calculated by the vertical grads method are quite satis factory under various conditions. When the Yangtse River runoff is normal or less than normal, the depth calculated by the S-T method is almost equal to that calculated by the vertical grads method in shallow shelf areas whose depths are less than 200m in the East China Sea. The vertical grads method is the best one for obtaining the depths of the thermocline and pycnocline if high-resulotion data is available. The depths of the thermocline and pycnocline can also be calculated correctly by using the S-T method in the shallow shelf areas when the Yangtse River runoff is normal or less than normal.

关 键 词：温跃层 密度跃层 垂向梯度法 S-T法 

分 类 号：P412.2[天文地球—大气科学及气象学]