| 摘要: |
| Phillips (1966)指出，Brunt-V?is?l? 频率的分布是海洋中最重要的动力学特征之一。它是研究海水内部运动的一个重要参数，特别是关于海洋内波的研究。Brunt-V?is?l? 频率又称静态稳定性频率，更确切地应称作浮力频率，因为它与分层流体中作绝热移动的流体元的浮力变化相联系。Brunt-V?is?l? 频率(以下缩写成B. V. f.) 记作N。
根据B. V. f. 分布特征研究海水结构及动力学特性的论述颇多，但绝大多数侧重于深海大洋的研究，且时常将其上层撇开，从而可求得一个比较简单的解析式，这显然是由于海洋上层较其下层复杂的缘故。对于浅海陆架的情形，研究得比较少。前田明夫(1974)曾根据日本近岸(5公里以内)三个观测站上1-3天的观测资料，分析研究了日本近海上层海洋短周期海水温度起伏的动力学特性。本文试图对我国东海陆架浅海B.V.f.的空间分布和时间变化特征作一探讨。 |
| 关键词: 时空变化 东海陆架区 |
| DOI： |
| 分类号: |
| 基金项目:中国科学院海洋研究所调查研究报告第1005号 |
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| ANALYSIS OF SPACE-TIME VARIATION OF BRUNT-VÄISÄLÄ FREQUENCY ON THE CONTINENTIAL SHELF OF THE EAST CHINA SEA |
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Gu Chuancheng, Lan Shufang, Fu Bingzhao
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Institute of Oceanology, Academia Sinica
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| Abstract: |
| The distribution of the Brunt-V?is?l? frequency is one of the most important dynamical characteristics of the ocean. In this paper the space-time variations of Brunt-V?is?l? frequency on the continential shelf of the East China Sea in summer are considered.
It has?been confirmed that the state of sea water is related to ,the static stability frequency. In shallow sea as well .as in deep-sea, states of the depths for which the static stability is the largest are the most likely to be unstable dynamically.
The vertical structure of sea water over the shelf of the East China Sea is also closely related to the static stability frequency. It is shown that 1) the number of water mass vertically may be determined by the number of the maximum of the vertical distrihution of mean Brunt-V?is?l? frequency with formula (3), 2) the depth :of the vertical boundary of water mass corresponds to that of the maximum stability, and 3) the depth of the core of intermediate water mass can be identified by the depth of the minimum stability. |
| Key words: SPACE-TIME VARIATION BRUNT-VÄISÄLÄ FREQUENCY CONTINENTIAL SHELF OF THE EAST CHINA SEA |
