全球海洋中尺度涡旋强度的季节性变化

IF 1.4 3区 地球科学 Q3 OCEANOGRAPHY
Yongcan Zu, Yue Fang, Shuangwen Sun, Libao Gao, Yang Yang, Guijun Guo
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引用次数: 0

摘要

中尺度漩涡是一种突出的海洋现象,在海洋物质传输和能量转换中发挥着重要作用。漩涡强度以旋转速度为特征,是漩涡最基本的属性之一。然而,人们尚未从全球海洋的角度研究涡强度的季节时空变化。在这项研究中,我们利用最新的卫星-测高计衍生的涡旋轨迹数据集,揭示了全球海洋涡旋强度的季节时空特征。结果表明,涡度强度具有明显的季节变化,北半球在春季达到峰值,而在秋季达到最小值,南半球则相反。在西太平洋、大西洋西北部和印度洋东部 15°至 30°纬度带内的热带-亚热带过渡区,涡度的季节变化更为剧烈,因为这些地区的气压不稳定性变化剧烈。进一步分析发现,由于最初的扰动需要时间才能成长为中尺度漩涡,因此气压不稳定性的季节变化比漩涡强度早 2-3 个月。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Seasonal variation of mesoscale eddy intensity in the global ocean

Mesoscale eddies are a prominent oceanic phenomenon that plays an important role in oceanic mass transport and energy conversion. Characterizing by rotational speed, the eddy intensity is one of the most fundamental properties of an eddy. However, the seasonal spatiotemporal variation in eddy intensity has not been examined from a global ocean perspective. In this study, we unveil the seasonal spatiotemporal characteristics of eddy intensity in the global ocean by using the latest satellite-altimetry-derived eddy trajectory data set. The results suggest that the eddy intensity has a distinct seasonal variation, reaching a peak in spring while attaining a minimum in autumn in the Northern Hemisphere and the opposite in the Southern Hemisphere. The seasonal variation of eddy intensity is more intense in the tropical-subtropical transition zones within latitudinal bands between 15° and 30° in the western Pacific Ocean, the northwestern Atlantic Ocean, and the eastern Indian Ocean because baroclinic instability in these areas changes sharply. Further analysis found that the seasonal variation of baroclinic instability precedes the eddy intensity by a phase of 2–3 months due to the initial perturbations needing time to grow into mesoscale eddies.

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来源期刊
Acta Oceanologica Sinica
Acta Oceanologica Sinica 地学-海洋学
CiteScore
2.50
自引率
7.10%
发文量
3884
审稿时长
9 months
期刊介绍: Founded in 1982, Acta Oceanologica Sinica is the official bi-monthly journal of the Chinese Society of Oceanography. It seeks to provide a forum for research papers in the field of oceanography from all over the world. In working to advance scholarly communication it has made the fast publication of high-quality research papers within this field its primary goal. The journal encourages submissions from all branches of oceanography, including marine physics, marine chemistry, marine geology, marine biology, marine hydrology, marine meteorology, ocean engineering, marine remote sensing and marine environment sciences. It publishes original research papers, review articles as well as research notes covering the whole spectrum of oceanography. Special issues emanating from related conferences and meetings are also considered. All papers are subject to peer review and are published online at SpringerLink.
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