摘要
研究了夏季白令海阿留申海盆区温跃层和中层冷水的分布特征及形成机制。结果表明：（1）以水温为主要分析指标，调查海区自上而下（0～500m层）可分为上匀和层、温跃层、中层冷水和下匀和层；（2）温跃层广泛分布于大部分调查海域，绝大多数测站其深度在25～50m，强度在0.10～0．16℃／m，其中公海东南部为一相对强温跃区（≥0．15℃／m）；（3）中层冷水的上界深度在40～130m左右，下界深度在150～260m左右，厚度在40～220m左右，其中公海区中层冷水的厚度在100m以上，中层冷水内部水温在1～3℃。（4）涡动混合和对流混合的共同作用，是夏季白令海形成温跃层和中层冷水的主要原因。
This paper mainly deals with the distribution of thermocline and middle cold water and preliminary analyses the formation of them in the Aleutian Basin of the Bering Sea in summer.The results indicate that: (1) The water column (0~500m) can be roughly divided into four layers, i. e., the upper homogeneous layer, the thermocline, the middle cold water and the lower homogeneous layer. (2)The thermocline is approximately observed between 25m and 50m depth and it ranges from 0. 10 to 0. 16℃/m in strength.There is the thermocline in most of surveyed area and it is the largest in the southeastern part of the high seas, with more than 0. 15℃/m in strength. (3) The upper limit depth, the lower limit depth and the thickness of middle cold water ranges from 40 to 130m depth, from 150 to 260m depth and from 40 to 220 meters, respectively.The thickness of the middle cold water exceeds 100 meters in the high seas, The water temperature in the inner of the middle cold water is 1~3℃ or so. (4) The combined effects of convective and turbulent mixing is the main cause of formation of thermocline and middle cold water.
出处
《海洋水产研究》
CSCD
2000年第2期48-54,共7页
Marine Fisheries Research
基金
农业部基金!89-90渔-02-01-01
关键词
白令海
温跃层
中层冷水
分布
形成
渔业资源
Bering sea Thermocline Middle cold water Distribution and formation
