ZHAO Yunxia, WEI Zexun, WANG Yonggang, XU Tengfei, FENG Ying. Correlation analysis of the North Equatorial Current bifurcation and the Indonesian Throughflow[J]. Acta Oceanologica Sinica, 2015, 34(9): 1-11. doi: 10.1007/s13131-015-0736-2
Citation: ZHAO Yunxia, WEI Zexun, WANG Yonggang, XU Tengfei, FENG Ying. Correlation analysis of the North Equatorial Current bifurcation and the Indonesian Throughflow[J]. Acta Oceanologica Sinica, 2015, 34(9): 1-11. doi: 10.1007/s13131-015-0736-2

Correlation analysis of the North Equatorial Current bifurcation and the Indonesian Throughflow

doi: 10.1007/s13131-015-0736-2
  • Received Date: 2014-09-23
  • Rev Recd Date: 2015-02-28
  • Based on monthly mean Simple Ocean Data Assimilation (SODA) products from 1958 to 2007, this study analyzes the seasonal and interannual variability of the North Equatorial Current (NEC) bifurcation latitude and the Indonesian Throughflow (ITF) volume transport. Further, Empirical Mode Decomposition (EMD) method and lag-correlation analysis are employed to reveal the relationships between the NEC bifurcation location, NEC and ITF volume transport and ENSO events. The analysis results of the seasonal variability show that the annual mean location of NEC bifurcation in upper layer occurs at 14.33°N and ITF volume transport has a maximum value in summer, a minimum value in winter and an annual mean transport of 7.75×106 m3/s. The interannual variability analysis indicates that the variability of NEC bifurcation location can be treated as a precursor of El Niño. The correlation coefficient between the two reaches the maximum of 0.53 with a time lag of 2 months. The ITF volume transport is positively related with El Niño events with a maximum coefficient of 0.60 by 3 months. The NEC bifurcation location is positively correlated with the ITF volume transport with a correlation coefficient of 0.43.
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  • Blanke B, Raynaud S. 1997. Kinematics of the Pacific Equatorial Undercurrent: an Eulerian and Lagrangian approach from GCM results. J Phys Oceanogr, 27(6): 1038-1053
    Carton J A, Chepurin G, Cao Xianhe, et al. 2000. A simple ocean data assimilation analysis of the global upper ocean 1950-95. Part I: Methodology. J Phys Oceanogr, 30(2): 294-309
    Carton J A, Giese B S. 2008. A reanalysis of ocean climate using simple ocean data assimilation. Mon Wea Rev, 136(8): 2999-3017
    Chen Zhaohui, Wu Lixin. 2011. Dynamics of the seasonal variation of the North Equatorial Current bifurcation. J Geophys Res, 116(C2): C02018
    Döös K. 1995. Interocean exchange of water masses. J Geophys Res, 100(C7): 13499-13514
    Fang Guohong, Susanto R D, Wirasantosa S, et al. 2010. Volume, Heat, and freshwater transports from the South China Sea to Indonesian Seas in the boreal winter of 2007-2008. J Geophys Res, 115: C12020
    Fang Guohong, Wang Yonggang, Wei Zexun, et al. 2009. Interocean circulation and heat and freshwater budgets of the South China Sea based on a numerical model. Dynamics of Atmospheres and Oceans, 47(1-3): 55-72
    Godfrey J S. 1989. A Sverdrup model of the depth-integrated flow for the world ocean allowing for island circulations. Geophysical and Astrophysical Fluid Dynamics, 45(1-2): 89-112
    Gordon A L. 1986. Interocean exchange of thermocline water. J Geophys Res, 91(C4): 5037-5046
    Gordon A L, Sprintall J, Van Aken H M, et al. 2010. The Indonesian throughflow during 2004-2006 as observed by the INSTANT program. Dynamics of Atmospheres and Oceans, 50(2): 115-128
    Huang N E, Shen Zheng, Long S R, et al. 1998. The empirical mode decomposition and the Hilbert spectrum for nonlinear and non-stationary time series analysis. Proc R Soc Lond, A 454(1971): 903-995
    Huang N E, Shen Zheng, Long S R. 1999. A new view of nonlinear water waves: the Hilbert spectrum. A Rev Fluid Mech, 31: 417-457 Jin Feifei. 1997. An equatorial ocean recharge paradigm for ENSO. Part: Conceptual model. Journal of Atmospheric Sciences, 54(7): 811-829
    Kim Y Y, Qu Tangdong, Jensen T, et al. 2004. Seasonal and interannual variations of the North Equatorial Current bifurcation in a high-resolution OGCM. J Geophys Res, 109: C03040
    Li Chongyin, Mu Mingquan. 1999. El Niño occurrence and sub-surface ocean temperature anomalies in the Pacific Warm Pool. Chinese Journal of Atmospheric Sciences (in Chinese), 23(5): 513-521
    Liu Qinyan, Huang Ruixin, Wang Dongxiao, et al. 2006. Interplay between the Indonesian throughflow and the South China sea throughflow. Chinese Science Bulletin, 51(2): 50-58
    Liu Qinyan, Huang Ruixin, Wang Dongxiao. 2012. Implication of the South China Sea throughflow for the interannual variability of the regional upper-ocean heat content. Advances in Atmospheric Sciences, 29(1): 54-62
    Masumoto Y, Yamagata T. 1996. Seasonal variability of the Indonesian throughflow in a general ocean circulation model. J Geophys Res, 101(C5): 12287-12293
    Meng Qingjia, Wang Fan, Liu Na. 2011. Low-frequency variability of the North Equatorial Current bifurcation in the past 40 years from SODA. Acta Oceanologica Sinica, 30(3): 14-19
    Metzger E, Hurlburt H E. 1996. The nondeterministic nature of Kuroshio penetration and eddy shedding in the South China Sea. J Phys Oceanogr, 31(7): 1712-1732
    Nitani H. 1972. Beginning of the Kuroshio. In: Stommel H, Yoshida K,eds. Kuroshio: Its physical aspects. Tokyo: Univ of Tokyo Press, 129-163
    Qiu Bo, Chen Shuiming. 2010. Interannual-to-decadal variability in the bifurcation of the North Equatorial Current off the Philippines. J Phys Oceanogr, 40(11): 2525-2538
    Qiu Bo, Lukas R. 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(C5): 12315-12330
    Qu Tangdong. 2002. Depth distribution of the subtropical gyre in the North Pacific. Journal of Oceanography, 58(3): 525-529
    Qu Tangdong, Lukas R. 2003. The bifurcation of the North Equatorial Current in the Pacific. J Phys Oceanogr, 33(1): 5-18
    Qu Tangdong, Mitsudera H, Yamagata T. 1998. On the western boundary currents in the Philippine Sea. J Geophys Res, 103(C4): 7537-7548
    Reid J L, Arthur R S. 1975. Interpretation of maps of geopotential anomaly for the deep Pacific Ocean. J Mar Res, 33: 37-52
    Sprintall J, Wijffels S E, Molcard R, et al. 2009. Direct estimates of the Indonesian Throughflow entering the Indian Ocean: 2004-2006. J Geophys Res, 114: C07001
    Toole J M, Millard R C, Wang Z, et al. 1990. Observations of the Pacific North Equatorial Current bifurcation at the Philippine coast. J Phys Oceanogr, 20(2): 307-318
    Toole J M, Zou E, Millard R C. 1988. On the circulation of the upper waters in the western equatorial Pacific Ocean. Deep-Sea Res Part A, 35(9): 1451-1482
    Vries P, Döös K. 2001. Calculating Lagrangian trajectories using timedependent velocity fields. J Atmos Ocean Technol, 18(6): 1092-1101
    Wang Qingye, Hu Dunxin. 2006. Bifurcation of the North Equatorial Current derived from altimetry in the Pacific Ocean. J Hy-drodyn, Ser B, 18(5): 620-626
    Wang Fujun, Hu Dunxin. 2012. A time-dependent baroclinic model on NEC bifurcation. Chinese Journal of Oceanology and Limnology, 30(1): 186-191
    Wijffels S, Firing E, Toole J M. 1995. The mean structure and variability of the Mindanao Current at 8°N. J Geophys Res, 100(C9): 18421-18435
    Wu Haiyan, Li Chongyin, Zhang Ming. 2010. The preliminary numerical research of effects of ITF on tropical Pacific-Indian Ocean associated temperature anomaly mode. Journal of Tropical Meteorology (in Chinese), 26(5): 513-520
    Wyrtki K. 1975. Fluctuations of the dynamic topography in the Pacific Ocean. J Phys Oceanogr, 5(3): 450-459
    Yaremchuk M, Qu Tangdong. 2004. Seasonal variability of the largescale currents near the coast of the Philippines. J Phys Oceanogr, 34(4): 844-855
    Zheng Quanan, Fang Guohong, Song Y T. 2006. Introduction to special section: dynamics and circulation of the Yellow, East, and South China Seas. J Geophys Res, 111(C11): C11S01
    Zheng Quanan, Hu Jianyu, Zhu Benli, et al. 2014. Standing wave modes observed in the South China Sea deep basin. J Geophys Res, 119(7): 4185-4199
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