• Alford, M. H., and et al. , 2015: The formation and fate of internal waves in the South China Sea. Nature, 521, 6569, https://doi.org/10.1038/nature14399.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Caruso, M. J., G. G. Gawarkiewicz, and R. C. Beardsley, 2006: Interannual variability of the Kuroshio intrusion in the South China Sea. J. Oceanogr., 62, 559575, https://doi.org/10.1007/s10872-006-0076-0.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Centurioni, L. R., P. P. Niiler, and D.-K. Lee, 2004: Observations of inflow of Philippine Sea surface water into the South China Sea through the Luzon Strait. J. Phys. Oceanogr., 34, 113121, https://doi.org/10.1175/1520-0485(2004)034<0113:OOIOPS>2.0.CO;2.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Chang, Y. L., Y. Miyazawa, and X. Guo, 2015: Effects of the STCC eddies on the Kuroshio based on the 20-year JCOPE2 reanalysis results. Prog. Oceanogr., 135, 6476, https://doi.org/10.1016/j.pocean.2015.04.006.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Farris, A., and M. Wimbush, 1996: Wind-induced Kuroshio intrusion into the South China Sea. J. Oceanogr., 52, 771784, https://doi.org/10.1007/BF02239465.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Gan, J., Z. Liu, and C. Hui, 2016: A three-layer alternating spinning circulation in the South China Sea. J. Phys. Oceanogr., 46, 23092315, https://doi.org/10.1175/JPO-D-16-0044.1.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Guo, J., Y. Feng, Y. Yuan, and B. Guo, 2013: Kuroshio loop current intruding into the South China Sea and its shedding eddy. Oceanol. Limnol. Sin., 23, 675689.

    • Search Google Scholar
    • Export Citation
  • Ho, C.-R., Q. Zheng, N.-J. Kuo, C.-H. Tsai, and N. E. Huang, 2004: Observation of the Kuroshio intrusion region in the South China Sea from AVHRR data. Int. J. Remote Sens., 25, 45834591, https://doi.org/10.1080/0143116042000192376.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Hu, D., L. Wu, W. Cai, A. S. Gupta, and W. S. Kessler, 2015: Pacific western boundary currents and their roles in climate. Nature, 522, 299308, https://doi.org/10.1038/nature14504.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Huang, X., Z. Chen, W. Zhao, Z. Zhang, C. Zhou, Q. Yang, and J. Tian, 2016: An extreme internal solitary wave event observed in the northern South China Sea. Sci. Rep., 6, 30041, https://doi.org/10.1038/srep30041.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Jia, Y., and E. P. Chassignet, 2011: Seasonal variation of eddy shedding from the Kuroshio intrusion in the Luzon Strait. J. Oceanogr., 67, 601611, https://doi.org/10.1007/s10872-011-0060-1.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Large, W. G., and S. Pond, 1981: Open-ocean momentum flux measurements in moderate to strong winds. J. Phys. Oceanogr., 11, 324336, https://doi.org/10.1175/1520-0485(1981)011<0324:OOMFMI>2.0.CO;2.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Li, L., and Y. Wu, 1989: A Kuroshio loop current in the South China Sea? On circulation of the northeastern South China Sea (in Chinese with English abstract). J. Oceanogr. Taiwan, 8, 8995.

    • Search Google Scholar
    • Export Citation
  • Li, L., W. D. Nowlin, and S. Jilan, 1998: Anticyclonic rings from the Kuroshio in the South China Sea. Deep-Sea Res. I, 45, 14691482, https://doi.org/10.1016/S0967-0637(98)00026-0.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Lien, R.-C., B. Ma, Y.-H. Cheng, C.-R. Ho, B. Qiu, C. M. Lee, and M.-H. Chang, 2014: Modulation of Kuroshio transport by mesoscale eddies at the Luzon Strait entrance. J. Geophys. Res. Oceans, 119, 21292142, https://doi.org/10.1002/2013JC009548.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Lien, R.-C., and et al. , 2015: The Kuroshio and Luzon undercurrent east of Luzon Island. Oceanography, 28, 5463, https://doi.org/10.5670/oceanog.2015.81.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Nan, F., H. Xue, F. Chai, L. Shi, M. Shi, and P. Guo, 2011: Identification of different types of Kuroshio intrusion into the South China Sea. Ocean Dyn., 61, 12911304, https://doi.org/10.1007/s10236-011-0426-3.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Nan, F., H. Xue, and F. Yu, 2014: Kuroshio intrusion into the South China Sea: A review. Prog. Oceanogr., 137, 314333, https://doi.org/10.1016/J.POCEAN.2014.05.012.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Nitani, H., 1972: Beginning of the Kuroshio. Kuroshio—Its Physical Aspects, H. Stommel and K. Yashida, Eds., University of Tokyo Press, 129–163.

  • Park, J.-H., and D. Farmer, 2013: Effects of Kuroshio intrusions on nonlinear internal waves in the South China Sea during winter. J. Geophys. Res. Oceans, 118, 70817094, https://doi.org/10.1002/2013JC008983.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Qiao, L., and R. H. Weisberg, 1998: Tropical instability wave energetics: Observations from the tropical instability wave experiment. J. Phys. Oceanogr., 28, 345360, https://doi.org/10.1175/1520-0485(1998)028<0345:TIWEOF>2.0.CO;2.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Qiu, B., and R. Lukas, 1996: Seasonal and interannual variability of the North Equatorial Current, the Mindanao Current, and the Kuroshio along the Pacific western boundary. J. Geophys. Res., 101, 12 31512 330, https://doi.org/10.1029/95JC03204.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Qu, T., Y. Y. Kim, M. Yaremchuk, T. Tozuka, A. Ishida, and T. Yamagata, 2004: Can Luzon Strait transport play a role in conveying the impact of ENSO to the South China Sea? J. Climate, 17, 36443657, https://doi.org/10.1175/1520-0442(2004)017<3644:CLSTPA>2.0.CO;2.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Scott, R. B., and F. Wang, 2005: Direct evidence of an oceanic inverse kinetic energy cascade from satellite altimetry. J. Phys. Oceanogr., 35, 16501666, https://doi.org/10.1175/JPO2771.1.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Shaw, P., 1989: The intrusion of water masses into the sea southwest of Taiwan. J. Geophys. Res., 94, 18 21318 226, https://doi.org/10.1029/JC094iC12p18213.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Sheremet, V. A., 2001: Hysteresis of a western boundary current leaping across a gap. J. Phys. Oceanogr., 31, 12471259, https://doi.org/10.1175/1520-0485(2001)031<1247:HOAWBC>2.0.CO;2.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Sheu, W. J., C. R. Wu, and L. Y. Oey, 2010: Blocking and westward passage of eddies in the Luzon Strait. Deep-Sea Res. II, 57, 17831791, https://doi.org/10.1016/j.dsr2.2010.04.004.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Song, Y. T., 2006: Estimation of interbasin transport using ocean bottom pressure: Theory and model for Asian marginal seas. J. Geophys. Res., 111, C11S19, https://doi.org/10.1029/2005JC003189.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Sun, Z., Z. Zhang, W. Zhao, and J. Tian, 2016: Interannual modulation of eddy kinetic energy in the northeastern South China Sea as revealed by an eddy-resolving OGCM. J. Geophys. Res. Oceans, 121, 31903201, https://doi.org/10.1002/2015JC011497.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Tian, J., Q. Yang, X. Liang, D. Hu, F. Wang, and T. Qu, 2006: Observation of Luzon Strait transport. Geophys. Res. Lett., 33, L19607, https://doi.org/10.1029/2006GL026272.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Vallis, G. K., 2006: Atmospheric and Oceanic Fluid Dynamics: Fundamentals and Large-Scale Circulation. Cambridge University Press, 745 pp.

    • Crossref
    • Export Citation
  • Wang, B., R. Wu, and X. Fu, 2000: Pacific–East Asian teleconnection: How does ENSO affect East Asian climate? J. Climate, 13, 15171536, https://doi.org/10.1175/1520-0442(2000)013<1517:PEATHD>2.0.CO;2.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Wang, G., D. Chen, and J. Su, 2008: Winter eddy genesis in the eastern South China Sea due to orographic wind jets. J. Phys. Oceanogr., 38, 726732, https://doi.org/10.1175/2007JPO3868.1.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Wang, J., and C.-S. Chern, 1987: The warm-core eddy in the northern South China Sea. I. Preliminary observations on the warm-core eddy (in Chinese with English abstract). Acta Oceanogr. Taiwan, 18, 92103.

    • Search Google Scholar
    • Export Citation
  • Wang, Y., G. Fang, Z. Wei, F. Qiao, and H. Chen, 2006: Interannual variation of the South China Sea circulation and its relation to El Niño, as seen from a variable grid global ocean model. J. Geophys. Res., 111, C11S14, https://doi.org/10.1029/2005JC003269.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Wu, C.-R., 2012: Interannual modulation of the Pacific Decadal Oscillation (PDO) on the low-latitude western North Pacific. Prog. Oceanogr., 110, 4958, https://doi.org/10.1016/J.POCEAN.2012.12.001.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Wu, C.-R., and T.-L. Chiang, 2007: Mesoscale eddies in the northern South China Sea. Deep-Sea Res. II, 54, 15751588, https://doi.org/10.1016/j.dsr2.2007.05.008.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Wu, C.-R., and Y.-C. Hsin, 2012: The forcing mechanism leading to the Kuroshio intrusion into the South China Sea. J. Geophys. Res., 117, C07015, https://doi.org/10.1029/2012JC007968.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Wu, C.-R., Y.-L. Wang, Y.-F. Lin, T.-L. Chiang, and C.-C. Wu, 2016: Weakening of the Kuroshio intrusion into the South China Sea under the global warming hiatus. IEEE J. Sel. Top. Appl. Earth Obs. Remote Sens., 9, 50645070, https://doi.org/10.1109/JSTARS.2016.2574941.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Wu, C.-R., Y.-L. Wang, Y.-F. Lin, and S.-Y. Chao, 2017: Intrusion of the Kuroshio into the south and East China Seas. Sci. Rep., 7, 7895, https://doi.org/10.1038/s41598-017-08206-4.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Xiu, P., and F. Chai, 2011: Modeled biogeochemical responses to mesoscale eddies in the South China Sea. J. Geophys. Res., 116, C10006, https://doi.org/10.1029/2010JC006800.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Xiu, P., M. Guo, L. Zeng, N. Liu, and F. Chai, 2016: Seasonal and spatial variability of surface chlorophyll inside mesoscale eddies in the South China Sea. Aquat. Ecosyst. Health Manage., 19, 250259, https://doi.org/10.1080/14634988.2016.1217118.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Xue, H., F. Chai, N. Pettigrew, D. Xu, M. Shi, and J. Xu, 2004: Kuroshio intrusion and the circulation in the South China Sea. J. Geophys. Res., 109, C02017, https://doi.org/10.1029/2002JC001724.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Yang, Q., H. Liu, and P. Lin, 2020: The effect of oceanic mesoscale eddies on the looping path of the Kuroshio intrusion in the Luzon Strait. Sci. Rep., 10, 636, https://doi.org/10.1038/s41598-020-57487-9.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Yu, K., and T. Qu, 2013: Imprint of the Pacific Decadal Oscillation on the South China Sea throughflow variability. J. Climate, 26, 97979805, https://doi.org/10.1175/JCLI-D-12-00785.1.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Yuan, D., and Z. Wang, 2011: Hysteresis and dynamics of a western boundary current flowing by a gap forced by impingement of mesoscale eddies. J. Phys. Oceanogr., 41, 878888, https://doi.org/10.1175/2010JPO4489.1.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Zhang, M., Y. Li, W. Wang, and Q. Huang, 1995: A three dimensional numerical circulation model of the South China Sea in winter. Proc. Symp. Marine Sciences in Taiwan Strait and Its Adjacent Waters, Beijing, China, China Ocean Press, 73–82.

  • Zhang, Z., W. Zhao, J. Tian, and X. Liang, 2013: A mesoscale eddy pair southwest of Taiwan and its influence on deep circulation. J. Geophys. Res. Oceans, 118, 64796494, https://doi.org/10.1002/2013JC008994.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Zhang, Z., W. Zhao, J. Tian, Q. Yang, and T. Qu, 2015: Spatial structure and temporal variability of the zonal flow in the Luzon Strait. J. Geophys. Res. Oceans, 120, 759776, https://doi.org/10.1002/2014JC010308.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Zhang, Z., J. Tian, B. Qiu, W. Zhao, P. Chang, D. Wu, and X. Wan, 2016: Observed 3D structure, generation, and dissipation of oceanic mesoscale eddies in the South China Sea. Sci. Rep., 6, 24349, https://doi.org/10.1038/srep24349.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Zhang, Z., W. Zhao, B. Qiu, and J. Tian, 2017: Anticyclonic eddy sheddings from Kuroshio loop and the accompanying cyclonic eddy in the northeastern south China sea. J. Phys. Oceanogr., 47, 12431259, https://doi.org/10.1175/JPO-D-16-0185.1.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Zhao, R., and X. Zhu, 2016: Weakest winter South China Sea western boundary current caused by the 2015–2016 El Niño event. J. Geophys. Res. Oceans, 121, 76737682, https://doi.org/10.1002/2016JC012252.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Zhao, Y.-B., X. S. Liang, and J. Gan, 2016: Nonlinear multiscale interactions and internal dynamics underlying a typical eddy-shedding event at Luzon Strait. J. Geophys. Res. Oceans, 121, 82088229, https://doi.org/10.1002/2016JC012483.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Zheng, Q., C.-R. Hu, L. Xie, and M. Li, 2019: A case study of a Kuroshio main path cut-off event and impacts on the South China Sea in fall-winter 2013–2014. Acta Oceanol. Sin., 38, 1219, https://doi.org/10.1007/s13131-019-1411-9.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Zhou, C., W. Zhao, J. Tian, X. Zhao, Y. Zhu, Q. Yang, and T. Qu, 2017: Deep western boundary current in the South China Sea. Sci. Rep., 7, 9303, https://doi.org/10.1038/s41598-017-09436-2.

    • Crossref
    • Search Google Scholar
    • Export Citation
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Three-Dimensional Structure and Interannual Variability of the Kuroshio Loop Current in the Northeastern South China Sea

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  • 1 Physical Oceanography Laboratory/IAOS and Frontiers Science Center for Deep Ocean Multispheres and Earth System, Ocean University of China, Qingdao, China
  • | 2 Physical Oceanography Laboratory/IAOS and Frontiers Science Center for Deep Ocean Multispheres and Earth System, Ocean University of China, and Laboratory for Ocean Dynamics and Climate, National Laboratory for Marine Science and Technology, Qingdao, China
  • | 3 Department of Oceanography, University of Hawai‘i at Mānoa, Honolulu, Hawaii
  • | 4 Physical Oceanography Laboratory/IAOS and Frontiers Science Center for Deep Ocean Multispheres and Earth System, Ocean University of China, Qingdao, China
  • | 5 Physical Oceanography Laboratory/IAOS and Frontiers Science Center for Deep Ocean Multispheres and Earth System, Ocean University of China, and Laboratory for Ocean Dynamics and Climate, National Laboratory for Marine Science and Technology, Qingdao, China
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Abstract

Based on long-term mooring-array and satellite observations, three-dimensional structure and interannual variability of the Kuroshio Loop Current (KLC) in the northeastern South China Sea (SCS) were investigated. The 3-yr moored data between 2014 and 2017 revealed that the KLC mainly occurred in winter and it exhibited significant interannual variability with moderate, weak, and strong strengths in the winters of 2014/15, 2015/16, and 2016/17, respectively. Spatially, the KLC structure was initially confined to the upper 500 m near the Luzon Strait, but it became more barotropic, with kinetic energy transferring from the baroclinic mode to the barotropic mode when it extended into the SCS interior. Through analyzing the historical altimeter data between 1993 and 2019, it is found that the KLC event in 2016/17 winter is the strongest one since 1993. Moored-data-based energetics analysis suggested that the growth of this KLC event was primarily fed by the strong wind work associated with the strengthened northeast monsoon in that La Niña–year winter. By examining all of the historical KLC events, it is found that the strength of KLC is significantly modulated by El Niño–Southern Oscillation, being stronger in La Niña and weaker in El Niño years. This interannual modulation could be explained by the strengthened (weakened) northeast monsoon associated with the anomalous atmospheric cyclone (anticyclone) in the western North Pacific during La Niña (El Niño) years, which inputs more (less) energy and negative vorticity southwest of Taiwan that is favorable (unfavorable) for the development of KLC.

Corresponding author: Zhiwei Zhang, zzw330@ouc.edu.cn

Abstract

Based on long-term mooring-array and satellite observations, three-dimensional structure and interannual variability of the Kuroshio Loop Current (KLC) in the northeastern South China Sea (SCS) were investigated. The 3-yr moored data between 2014 and 2017 revealed that the KLC mainly occurred in winter and it exhibited significant interannual variability with moderate, weak, and strong strengths in the winters of 2014/15, 2015/16, and 2016/17, respectively. Spatially, the KLC structure was initially confined to the upper 500 m near the Luzon Strait, but it became more barotropic, with kinetic energy transferring from the baroclinic mode to the barotropic mode when it extended into the SCS interior. Through analyzing the historical altimeter data between 1993 and 2019, it is found that the KLC event in 2016/17 winter is the strongest one since 1993. Moored-data-based energetics analysis suggested that the growth of this KLC event was primarily fed by the strong wind work associated with the strengthened northeast monsoon in that La Niña–year winter. By examining all of the historical KLC events, it is found that the strength of KLC is significantly modulated by El Niño–Southern Oscillation, being stronger in La Niña and weaker in El Niño years. This interannual modulation could be explained by the strengthened (weakened) northeast monsoon associated with the anomalous atmospheric cyclone (anticyclone) in the western North Pacific during La Niña (El Niño) years, which inputs more (less) energy and negative vorticity southwest of Taiwan that is favorable (unfavorable) for the development of KLC.

Corresponding author: Zhiwei Zhang, zzw330@ouc.edu.cn
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