垂直梯度法与最优分割法确定温跃层边界的比较分析  

Contrast between Vertical Grads Method and Optimum Partition Method in Thermocline Boundary Determination

作　　者：张旭[1] 张永刚[1] 聂邦胜[1] 姚忠山[1] 

机构地区：[1]海军大连舰艇学院军事海洋系,辽宁大连116018

出　　处：《海洋通报》2008年第6期20-26,共7页Marine Science Bulletin

摘　　要：垂直梯度法是跃层示性特征计算中普遍使用的方法,但在某些情况下并不能很好地描述海洋要素的跃变特征。针对垂直梯度法的不足,引入水团分析中的最优分割法,对典型剖面,以及边界型、逆变型、多层型等几类特殊剖面的跃层边界分别进行了计算,并对垂直梯度法与垂直梯度法的计算结果进行了比较分析,结果表明最优分割法确定的跃层边界更为合理。通过对两种方法确定的中国近海温跃层的整体分布进行比较分析,证明了最优分割法能够弥补垂直梯度法在计算深海与浅海过渡区中的跃层时遇到的标准不匹配问题,较好地保持跃层的连续性。Vertical grads method is extensively used in thermocline calculation. However, it doesn＇t work out in some particular conditions. Addressing to deficiencies of this method, optimum partition method which is widely used in mass analysis is developed to fit thermocline boundary calculation. Two methods are contrasted in many kinds of profiles, such as typical profiles, boundary profiles, reversal profiles and multiple-layer profiles. The optimum partition method is proved more reasonable in thermocline boundary determination. When it comes to regional thermocline distribution as a whole, shallow sea criterion and deep sea criterion can＇t be matching in transitional region by vertical grads method, and optimum partition method is better than vertical grads method in the course of holding the continuity of thermocline between shallow sea and deep sea.

关 键 词：温跃层 跃层边界 垂直梯度法 最优分割法 

分 类 号：P731.11[天文地球—海洋科学]