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西北太平洋冷涡特征统计分析

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在北半球,气旋型涡旋会形成上升流,导致底层较冷海水翻涌到表层,并与较暖海水混合,造成表层水体温度下降和中心海表面高度下降.为探究冷涡的时空变化规律,对冷涡数据集进行统计发现:冷涡生成和消亡数量在空间分布上表现出不规则性和一致性;在时间上表现出强烈的季节性,冬季多、夏季少,秋、冬两季均生成量大于消亡量,春、夏则相反;其生成数量随寿命的延长而减少,平均速度随寿命的缩短表现出更大的不稳定性;超过 76.5%的冷涡向西移动,而向东移动的冷涡倾向于生成在 30°N以北的海域.统计冷涡的旋转速度、振幅发现,它们的高值区都和涡轮动能高值区的纬度对应.
Statistical Analysis of Cold Eddy Characteristics in Northwest Pacific Ocean
In the Northern Hemisphere,cyclonic eddies form upwelling currents that cause cooler seawater at the bottom to surge to the surface and mix with warmer seawater at the surface,causing the temperature of the surface seawater to drop and the height of the central sea surface to drop.In this paper,statistical analysis of the cold eddies data set is carried out to explore the spatio-temporal variation of the cold eddies.It is found that the amount of cold eddies generated and dissipated shows irregularity and consistency in spatial distribution,and shows strong seasonality in time,more in winter and less in summer.The amount of cold eddies generated in autumn and winter is greater than the amount of eddies dissipated,but the opposite is true in spring and summer.The amount of generation decreases with the extension of life,and the average velocity shows greater instability with the shortening of life.More than 76.5%of the cold eddies move to the west,and the cold eddies moving to the east tend to be generated in the sea area north of 30°N.By calculating the rotation velocity and amplitude of the cold eddies,it is found that their high values correspond to the latitude of the high values of the EKE.

Northwest Pacific Oceanmesoscale cold eddystatistical analysis

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中国海洋大学 山东青岛 266100

西北太平洋 中尺度冷涡 统计分析

2024

天津科技
天津科学技术信息研究所

天津科技

影响因子:0.253
ISSN:1006-8945
年,卷(期):2024.51(12)