Journal of Marine Sciences ›› 2023, Vol. 41 ›› Issue (3): 22-33.DOI: 10.3969/j.issn.1001-909X.2023.03.003

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Spatiotemporal variation of surface eddy kinetic energy in the South Australian Basin

LIU Jia1(), ZHENG Shaojun1,2,3,*(), YAN Li1,2,3, CHEN Hangbiao1, LIU Tingzhen1   

  1. 1. Laboratory for Coastal Ocean Variation and Disaster Prediction, College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang 524088, China
    2. Key Laboratory of Climate, Resources, and Environment in Continental Shelf Sea and Deep Sea of Department of Education of Guangdong Province, Guangdong Ocean University, Zhanjiang 524088, China
    3. Key Laboratory of Space Ocean Remote Sensing and Application, Ministry of Natural Resources, Beijing 100081, China
  • Received:2022-09-26 Revised:2023-03-07 Online:2023-09-15 Published:2023-10-24

Abstract:

The spatiotemporal variation of surface eddy kinetic energy (EKE) in the South Australian Basin was studied using sea level anomaly during 1993-2019. The results show that in spatial scale there are two regions of high EKE: one to the west, and one to the east. On the seasonal scale, surface EKE is the strongest in austral winter with a maximum (57±9 cm2/s2) in July and the weakest in autumn with a minimum (40±5 cm2/s2) in March. On the interannual scale, surface EKE is related to El Niño-Southern Oscillation (ENSO) and Southern Annular Mode (SAM). Partial correlation analysis indicates that surface EKE shows negative correlations with ENSO, lagging the Niño3.4 index by 9 months, and EKE is significantly weakened (strengthened) in the decaying year of El Niño (La Niña). Meanwhile, surface EKE shows positive correlations with SAM, lagging SAM index by 14 months, and EKE is significantly strengthened (weakened) in the next year of the positive (negative) SAM phases.

Key words: eddy kinetic energy, spatiotemporal variation, El Niño-Southern Oscillation (ENSO), Southern Annular Mode (SAM), South Australian Basin

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