边缘海与开阔海中尺度涡生命周期演化规律对比分析: 以南海和黑潮延伸体为例

doi:10.11978/2022210

Abstract

Abstract:

Using the AVISO (archiving validation and interpretation of satellite oceanographic) eddy trajectories atlas product from 1993 to 2020, this study comparatively analyzes the characteristics and evolution patterns of mesoscale eddies during eddy life span in the South China Sea (SCS), a marginal sea of the Pacific Ocean, and the Kuroshio Extension (KE), an open ocean. The results show that there is significant seasonal variation in the eddy characteristics in the SCS, with opposite polarity probability distribution of cyclonic eddies (CEs) and anticyclonic eddies (AEs) in winter and summer, while the distribution in KE has no seasonal variation. The AEs are stronger than CEs in summer in the SCS, while CEs are stronger than AE in the KE both in winter and summer. During the eddy life span, the eddy kinetic energy (EKE) exhibits asymmetrical growth, stable and decay stages both in the SCS and KE. The eddy growth stage in the SCS is shorter than the decay stage, while the decay stage is shorter in the KE. The change rate of EKE during life span has larger values in summer than that in winter in the SCS, but has 1.5 times larger in winter in the KE. The mean propagation velocity curves shown that the AEs move northwestward and then southwestward in the SCS with average zonal speed of 3.3 cm·s^-1, while in the KE, CEs move southwestward and AEs move northwestward in the whole life span, with average zonal speed of 1.3 cm·s^-1, which is slower than that in the SCS. There is a significant negative correlation between the eddy propagation velocity and the EKE in the eddy life cycle in both regions.

Key words: South China Sea, Kuroshio Extension, mesoscale eddies, eddy kinetic energy

ZHANG Zhisheng, XIE Lingling, LI Junyi, LI Qiang. Comparative analysis of mesoscale eddy evolution during life cycle in marginal sea and open ocean: South China Sea and Kuroshio Extension[J].Journal of Tropical Oceanography, 2023, 42(4): 63-76.

Figures/Tables 8

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海区	涡旋	数量/个	快照数/个	振幅/cm	半径/km	Te/d	EKE/(cm²·s^-2)
SCS	AEs	763	45674	7.5±5.4	112.3±44.7	59.9±35.9	496.8±355.2
	CEs	902	49118	6.7±4.5	107.5±43.2	54.5±28.8	494.9±417.6
	全部	1665	94792	7.1±5.0	109.8±44.0	56.9±32.3	495.8±388.8
KE	AEs	1384	115504	17.3±11.5	94.7±31.3	83.5±75.5	930.5±751.8
	CEs	1469	123021	19.0±13.0	87.8±29.6	83.7±72.5	1424.4±1486.5
	全部	2853	238525	18.2±12.4	91.1±30.6	83.6±73.9	1185.2±1214.2

Comparative analysis of mesoscale eddy evolution during life cycle in marginal sea and open ocean: South China Sea and Kuroshio Extension

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