Journal of Oceanography

, Volume 68, Issue 5, pp 625–639 | Cite as

Kuroshio pathways in a climatologically forced model

  • Elizabeth M. Douglass
  • Steven R. Jayne
  • Frank O. Bryan
  • Synte Peacock
  • Mathew Maltrud
Original Article

Abstract

A high-resolution ocean model forced with an annually repeating atmosphere is used to examine variability of the Kuroshio, the western boundary current in the North Pacific Ocean. A large meander (LM) in the path of the Kuroshio south of Japan develops and disappears in a highly bimodal fashion on decadal timescales. The modeled meander is comparable in timing and spatial extent to an observed feature in the region. Various characteristics of the LM are examined, including relative vorticity, transport, and velocity shear. The many similarities between the model and observations indicate that the meander results from intrinsic oceanic variability, which is represented in this climatologically forced model. Each LM is preceded by a smaller “trigger” meander that originates at the south end of Kyushu, moves up the coast, and develops into the LM. However, there are also many meanders very similar in character to the trigger meander that do not develop into LMs. Formation of an LM only occurs when a deep anticyclone associated with the trigger meander forms near Koshu Seamount. Furthermore, the major axis of that deep anticyclone must be oriented away from the coast, rather than alongshore. In the specific case of interaction of a trigger meander with a deep anticyclone with major axis oriented away from the coastline, LM formation occurs.

Keywords

North Pacific Kuroshio Large meander Trigger meander Bimodal variability Interannual variability 

References

  1. Adcroft A, Hill C, Marshall J (1997) Representation of topography by shaved cells in a height coordinate ocean model. Mon Weather Rev 125(9):2293–2315CrossRefGoogle Scholar
  2. Andres M, Park JH, Wimbush M, Zhu XH, Chang KI, Ichikawa H (2008) Study of the Kuroshio/Ryukyu Current System based on satellite-altimeter and in situ measurements. J Oceanogr 64:937–950CrossRefGoogle Scholar
  3. Book J, Wimbush M, Imawaki S, Ichikawa H, Uchida H, Kinoshita H (2002) Kuroshio temporal and spatial variations south of Japan determined from inverted echo sounder measurements. J Geophys Res 107:3121CrossRefGoogle Scholar
  4. Endoh T, Hibiya T (2001) Numerical simulation of the transient response of the Kuroshio leading to the large meander formation south of Japan. J Geophys Res 106:26833–26850CrossRefGoogle Scholar
  5. Endoh T, Hibiya T (2009) Interaction between the trigger meander of the Kuroshio and the abyssal anticyclone over Koshu Seamount as seen in the reanalysis data. Geophys Res Lett 36:L18604Google Scholar
  6. Endoh T, Tsujino H, Hibiya T (2011) The effect of Koshu Seamount on the formation of the Kuroshio large meander south of Japan. J Phys Oceanogr 41:1624–1629CrossRefGoogle Scholar
  7. Feng M, Mitsudera H, Yoshikawa Y (2000) Structure and variability of the Kuroshio Current in Tokara Strait. J Phys Oceanogr 30:2257–2276CrossRefGoogle Scholar
  8. Jayne SR, Hogg NG, Waterman SN, Rainville L, Donohue KA, Watts DR, Tracey KL, McClean JL, Maltrud ME, Qiu B, Chen S, Hacker P (2009) The Kuroshio Extension and its recirculation gyres. Deep-Sea Res I 56:2088–2099CrossRefGoogle Scholar
  9. Kakinoki K, Imawaki S, Uchida H, Nakamura H, Ichikawa K, Umatani S, Nishina A, Ichikawa H, Wimbush M (2008) Variations of Kuroshio geostrophic transport south of Japan estimated from long-term IES observations. J Oceanogr 64:373–384CrossRefGoogle Scholar
  10. Kawabe M (1985) Sea level variations at the Izu Islands and typical stable paths of the Kuroshio. J Oceanogr 41:307–326Google Scholar
  11. Kawabe M (1987) Spectral properties of sea level and time scales of Kuroshio path variations. J Oceanogr 43:111–123Google Scholar
  12. Kawabe M (1995) Variations of current path velocity, and volume transport of the Kuroshio in relations with the large meander. J Phys Oceanogr 25:3103–3117CrossRefGoogle Scholar
  13. Kawabe M (1996) Model study of flow conditions causing the large meander of the Kuroshio south of Japan. J Phys Oceanogr 26:2449–2461CrossRefGoogle Scholar
  14. Large WG, Yeager SG (2009) The global climatology of an interannually varying air-sea flux data set. Clim Dynam. 33:341–364CrossRefGoogle Scholar
  15. Maltrud ME, McClean JL (2005) An eddy resolving global 1/10 degrees ocean simulation. Ocean Model 8:31–54CrossRefGoogle Scholar
  16. Maltrud ME, Bryan FO, Peacock S (2010) Boundary impulse response functions in a century-long eddying global ocean simulation. Environ Fluid Mech 10:275–295CrossRefGoogle Scholar
  17. Maximenko N (2002) Index and composites of the Kuroshio meander south of Japan. J Oceanogr 58:639–649CrossRefGoogle Scholar
  18. Nagano A, Ichikawa K, Ichikawa H, Konda M, Murakami K (2009) Synoptic flow structures in the confluence region of the Kuroshio and the Ryukyu Current. J Geophys Res 114:C06007CrossRefGoogle Scholar
  19. Nagano A, Ichikawa K, Ichikawa H, Tomita H, Tokinaga H, Konda M (2010) Stable volume and heat transports of the North Pacific subtropical gyre revealed by identifying the Kuroshio in synoptic hydrography south of Japan. J Geophys Res 115:C09002CrossRefGoogle Scholar
  20. Nakano H, Ishikawa I (2010) Meridional shift of the Kuroshio Extension induced by response of recirculation gyre to decadal wind variations. Deep-Sea Res II 57:1111–1126CrossRefGoogle Scholar
  21. Qiu B, Chen S (2005) Variability of the Kuroshio Extension jet, recirculation gyre, and mesoscale eddies on decadal time scales. J Phys Oceanogr 35:2090–2103CrossRefGoogle Scholar
  22. Qiu B, Joyce T (1992) Interannual variability in the mid- and low-latitude western North Pacific. J Phys Oceanogr 22:1062–1079CrossRefGoogle Scholar
  23. Qiu B, Miao W (2000) Kuroshio path variations south of Japan: bimodality as a self-sustained internal oscillation. J Phys Oceanogr 30:2124–2137CrossRefGoogle Scholar
  24. Smith R, Gent P (2002) Reference manual for the parallel ocean program (POP). Los Alamos unclassified report LA-UR-02-2484Google Scholar
  25. Solomon H (1978) Occurrence of small “trigger” meanders in the Kuroshio off southern Kyushu. J Oceanogr 34:81–84Google Scholar
  26. Stommel H, Yoshida K (eds) (1972) Kuroshio: its physical aspects. University of Tokyo Press, TokyoGoogle Scholar
  27. Sugimoto S, Hanawa K (2012) Relationship between the path of the Kuroshio in the south of Japan and the path of the Kuroshio Extension in the east. J Oceanogr 68:219–225CrossRefGoogle Scholar
  28. Tsujino H, Usui N, Nakano H (2006) Dynamics of Kuroshio path variations in a high-resolution general circulation model. J Geophys Res 111:C11001CrossRefGoogle Scholar
  29. Usui N, Tsujinu H, Fujii Y, Kamachi M (2008a) Generation of a trigger meander for the 2004 Kuroshio large meander. J Geophys Res 113:C01012CrossRefGoogle Scholar
  30. Usui N, Tsujino H, Nakano H, Fujii Y (2008b) Formation process of the Kuroshio large meander in 2004. J Geophys Res 113:C08047CrossRefGoogle Scholar
  31. White W, McCreary J (1976) Formation of Kuroshio meander and its relationship to large-scale ocean circulation. Deep-Sea Res 23(1):33–47Google Scholar
  32. Wijffels SE, Hall M, Joyce T, Torres D, Hacker P, Firing E (1998) Multiple deep gyres of the western North Pacific: a WOCE section along 149 degrees E. J Geophys Res 103:12985–13009CrossRefGoogle Scholar
  33. Yoon JH, Yasuda I (1987) Dynamics of the Kuroshio large meander: two-layer model. J Phys Oceanogr 17:66–81CrossRefGoogle Scholar
  34. Yoshinari H, Ikeda M, Tanaka K, Masumoto Y (2004) Sensitivity of the interannual Kuroshio transport variation south of Japan to wind dataset in OGCM calculation. J Oceanogr 60(2):341–350CrossRefGoogle Scholar
  35. Zhu X, Park J, Kaneko I (2006) Velocity structures and transports of the Kuroshio and the Ryukyu Current during fall of 2000 estimated by an inverse technique. J Oceanogr 62:587–596CrossRefGoogle Scholar

Copyright information

© The Oceanographic Society of Japan and Springer 2012

Authors and Affiliations

  • Elizabeth M. Douglass
    • 1
  • Steven R. Jayne
    • 1
  • Frank O. Bryan
    • 2
  • Synte Peacock
    • 2
  • Mathew Maltrud
    • 3
  1. 1.Woods Hole Oceanographic InstitutionWoods HoleUSA
  2. 2.National Center for Atmospheric ResearchBoulderUSA
  3. 3.Los Alamos National LaboratoryLos AlamosUSA

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