Response of ocean dynamics to multiple equilibria of the Kuroshio path South of Japan |
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| Institution: | 1. Key Laboratory of Meteorological Disaster of Ministry of Education (KLME)/Joint International Research Laboratory of Climate and Environment Change (ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), College of Atmospheric Science, Nanjing University of Information Science and Technology, Nanjing, 210044, China;2. Earth System Modeling Center, College of Atmospheric Science, Nanjing University of Information Science and Technology, Nanjing, 210044, China;3. China-US joint Atmosphere-Ocean Research Center and International Pacific Research Center, School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, Honolulu, Hawaii, 96822, USA;1. Nanjing University of Information Science and Technology, Nanjing, 210044, China;2. Laboratory for Climate Studies & CMA-NJU Joint Laboratory for Climate Prediction Studies, National Climate Center, China Meteorological Administration, Beijing, 100081, China;3. Department of Atmospheric Science, School of Environmental Studies, China University of Geoscience, Wuhan, 430074, China;4. Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China;5. University of Chinese Academy of Sciences, Beijing, 100049, China;1. Laboratory of Marine Biology, Graduate School of Fisheries Science, Hokkaido University, 3-1-1 Minato-cho, Hakodate, Hokkaido, 041-8611, Japan;2. Shiretoko Foundation, 531 Iwaubetsu, Onnebetsu, Shari, Hokkaido, 099-4356, Japan;1. Department of Geosciences, Tel Aviv University, Tel Aviv, Israel;2. Department of Meteorology and Atmospheric Science, Pennsylvania State University, University Park, PA, USA;3. German Remote Sensing Data Center – German Aerospace Center (DLR), Oberpfaffenhofen, Germany;4. Institute of Physics, University of Augsburg, Germany;5. National Institute of Geophysics and Volcanology (I.N.G.V.), Osservatorio Etneo, Section of Catania, Catania, Italy;1. Department of Earth Sciences, Science and Research Branch, Islamic Azad University, Tehran, Iran;2. Department of Space Physics, Institute of Geophysics, University of Tehran, Iran;1. Naval Research Laboratory, Stennis Space Center, MS, United States;2. Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States |
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| Abstract: | Variability of the Kuroshio path to the south of Japan plays a central role in the local climate change and exerts tremendous influences on the local atmosphere and ocean. In this study, the response of ocean dynamics, in terms of the eddy kinetic energy (EKE), potential vorticity (PV), relative vorticity, and eddy-mean flow interaction, to the Kuroshio path change is discussed. Kuroshio path south of Japan includes the near-shore non-large meander (nNLM), the off-shore non-large meander (oNLM), and the typical large meander (tLM). Analyses reveal that the distribution of EKE, PV, relative vorticity, and energy exchange between the eddy field and the mean flow respectively varies with the Kuroshio path: (1) The tLM has the maximum EKE along the path; (2) The positive and negative PV are located at the onshore and offshore side of Kuroshio axis, respevetively; (3) The distributions of anomalous relative voritcity of nNLM, oNLM, and tLM are consistent with sea surface height anomalies (SSHAs); (4) The tLM has the largest energy exchange between the eddy field and the mean flow in terms of the rate of barotropic energy conversion. On the other hand, the stability analysis of ocean currents suggests that the three Kuroshio paths south of Japan have their own intrinsic properties of the instability. |
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| Keywords: | Kuroshio paths Eddy kinetic energy potential vorticity relative vorticity eddy-mean flow interaction stability analysis |
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