Decadal variability of the Kuroshio Extension: mesoscale eddies and recirculations

Springer Science and Business Media LLC - Tập 60 - Trang 673-691 - 2010
Bunmei Taguchi1, Bo Qiu2, Masami Nonaka3, Hideharu Sasaki1, Shang-Ping Xie4, Niklas Schneider4
1Earth Simulator Center, Japan Marine-Earth Science and Technology, Yokohama, Japan
2Department of Oceanography, University of Hawaii at Manoa, Honolulu, USA
3Research Institute for Global Change, Japan Marine-Earth Science and Technology, Yokohama, Japan
4International Pacific Research Center, University of Hawaii at Manoa, Honolulu, USA

Tóm tắt

An eddy-resolving multidecadal ocean model hindcast simulation is analyzed to investigate time-varying signals of the two recirculation gyres present respectively to the north and south of the Kuroshio Extension (KE) jet. The northern recirculation gyre (NRG), which has been detected at middepth recently by profiling float and moored current meter observations, is a major focus of the present study. Low-frequency variations in the intensity of the recirculation gyres are overall highly correlated with decadal variations of the KE jet induced by the basin-wide wind change. Modulation of the simulated mesoscale eddies and its relationship with the time-varying recirculation gyres are also evaluated. The simulated eddy kinetic energy in the upstream KE region is inversely correlated with the intensity of the NRG, consistent with previous observational studies. Eddy influence on the low-frequency modulation of the NRG intensity at middepth is further examined by a composite analysis of turbulent Sverdrup balance, assuming a potential vorticity balance between the mean advection and the convergent eddy fluxes during the different states of the recirculation gyre. The change in the NRG intensity is adequately explained by that inferred by the turbulent Sverdrup balance, suggesting that the eddy feedback triggers the low-frequency modulation of the NRG intensity at middepth.

Tài liệu tham khảo

Berloff P, Hogg A, Dewar W (2007) The turbulent oscillator: a mechanism of low-frequency variability of the wind-driven ocean gyres. J Phys Oceanogr 37:2363–2386 Ceballos L, Lorenzo ED, Hoyos C, Schneider N, Taguchi B (2009) North Pacific gyre oscillation synchronizes climate fluctuations in the eastern and western boundary systems. J Climate 22:5163–5174 Cessi PR, Ierley G, Young WR (1987) A model of inertial recirculation driven by potential vorticity anomalies. J Phys Oceanogr 17:1640–1652. Deser C, Alexander MA, Timlin MS (1999) Evidence for a wind-driven intensification of the Kuroshio current extension from the 1970s to the 1980s. J Climate 12:1697–1706 Di Lorenzo E and coauthors (2008) North Pacific gyre oscillation links ocean climate and ecosystem change. Geophys Res Lett 35:1–6. doi:10.1029/2007GL032838 Dijkstra HA, Ghil M (2005) Low-frequency variability of the ocean circulation: a dynamical system approach. Rev Geophys 43:RG3002. doi:10.1029/2002RG000122 Ducet N, LeTraon P-Y, Reverdin G (2000) Global high resolution mapping of ocean circulation from TOPEX/Poseidon and ERS-1/2. J Geophys Res 105:19477–19498 Hogg N (1988) Stochastic wave radiation by the Gulf Stream. J Phys Oceangr 18:1687–1701. Hogg AM, Killworth PD, Blundell JR, Dewar WK (2005) Mechanisms of decadal variability of the wind-driven ocean circulation. J Phys Oceanogr 35:512–531 Jayne S, Hogg N, Waterman S, Rainville L, Donohue K, Watts D, Tracey K, McClean J, Maltrud M, Qiu B, Chen S, Hacker P (2009) The Kuroshio extension and its recirculation gyres. Deep Sea Res 56:2088–2099 Jiang S, Jin F-F, Ghil M (1995) Multiple equilibria, periodic, and aperiodic solutions in a wind-driven, double-gyre, shallow-water model. J Phys Oceanogr 25:764–786 Kalnay E and coauthors (1996) The NCEP/NCAR 40-year reanalysis project. Bull Am Meteor Soc 77:437–471 Kwon Y-O, Deser C (2007) North Pacific decadal variability in the community climate system model version 2. J Climate 20:2416–2433 Masumoto Y, Sasaki H, Kagimoto T, Komori N, Ishida A, Sasai Y, Miyama T, Motoi T, Mitsudera H, Takahashi K, Sakuma H, Yamagata T (2004) A fifty-year eddy-resolving simulation of the world ocean—preliminary outcomes of OFES (OGCM for the earth simulator). J Earth Simul 1:31–52 Maximenko N, Niiler P (2004) Hybrid decade-mean global sea level with mesoscale resolution. In: Saxena N (ed) Recent advances in marine science and technology. PACON International, Honolulu, pp 55–59 McClean J, Jayne S, Maltrud M, Ivanova D (2009) The fidelity of ocean models with explicit eddies. In: Hecht MW, Hasumi H (eds) Ocean modeling in an eddying regime. Am Geophys Union Geophys Monograph, no 177. American Geophysical Union, Washington, pp 149–163 Miller A, Cayan D, White W (1998) A westward-intensified decadal change in the North Pacific thermocline and gyre-scale circulation. J Climate 11:3112–3127 Nakamura H, Sampe T, Tanimoto Y, Shimpo A (2004) Observed associations among storm tracks, jet streams, and midlatitude oceanic fronts. In: Wang C, Xie S-P, Carton J (eds) Earth climate: the ocean-atmosphere interaction. Amer. Geophys. Union. Geophys. Monograph, no 147. American Geophysical Union, Washington, pp 329–345 Nakano H, Tsujino H, Furue R (2008) The Kuroshio current system as the jet and twin “relative” recirculation gyres embedded in the Sverdrup circulation. Dynam Ocean Atmos 45:135–164 Niiler P, Maximenko N, McWilliams JC (2003a) Dynamically balanced absolute sea level of the global ocean derived from near-surface velocity observations. Geophys Res Lett 30:2164. doi:10.1029/2003GL018628 Niiler P, Maximenko N, Panteleev G, Yamagata T, Olson D (2003b) Near-surface dynamical structure of the Kuroshio extension. J Geophys Res 108:3193. doi:10.1029/2002JC001461 Nonaka M, Nakamura H, Tanimoto Y, Kagimoto T, Sasaki H (2006) Decadal variability in the Kuroshio–Oyashio extension simulated in an eddy-resolving OGCM. J Climate 19:1970–1989 Nonaka M, Nakamura H, Tanimoto Y, Kagimoto T, Sasaki H (2008) Interannual-to-decadal variability in the Oyashio Current and its influence on temperature in the subarctic frontal zone: an eddy-resolving OGCM simulation. J Climate 21:6283–6303 Pacanowski RC, Griffies SM (2000) MOM 3.0 manual. Technical report, Geophysical Fluid Dynamics Laboratory/National Oceanic and Atmospheric Administration, 680 pp Pedlosky J (1996) Ocean circulation theory. Springer, Berlin Pierini S, Dijkstra H (2009) Low-frequency variability of the Kuroshio extension. Nonlinear Process Geophys 16:665–675 Pierini S, Dijkstra H, Riccio A (2009) A nonlinear theory of the Kuroshio Extension bimodality. J Phys Oceanogr 39:2212–2229 Qiu B (2002) The Kuroshio Extension system: its large-scale variability and role in the midlatitude ocean–atmosphere interaction. J Oceanogr 58:57–75 Qiu B (2003) Kuroshio Extension variability and forcing of the Pacific decadal oscillations: responses and potential feedback. J Phys Oceanogr 33:2465–2482 Qiu B, Chen S (2005) Variability of the Kuroshio Extension jet, recirculation gyre and mesoscale eddies on decadal timescales. J Phys Oceanogr 35:2090–2103 Qiu B, Chen S (2010) Eddy-mean flow interaction in the decadally modulating Kuroshio Extension system. Deep Sea Res 57. doi:10.1016/j.dsr2.2008.11.036 Qiu B, Kelly K, Joyce T (1991) Mean flow and variability of the Kuroshio Extension from the Geosat altimetry data. J Geophys Res 96:18491–18507 Qiu B, Schneider N, Chen S (2007) Coupled decadal variability in the North Pacific: an observationally-constrained idealized model. J Climate 20:3602–3620 Qiu B, Chen S, Hacker P, Hogg N, Jayne S, Sasaki H (2008) The Kuroshio Extension northern recirculation gyre: profiling float measurements and forcing mechanism. J Phys Oceanogr 38:1764–1779 Rhines PB, Holland WR (1979) A theoretical discussion of eddy-driven mean flows. Dyn Atmos Oceans 3:289–325 Rosati A, Miyakoda K (1988) A general circulation model for upper ocean circulation. J Phys Oceanogr 18:1601–1620 Sasai Y, Sasaoka K, Sasaki H, Ishida A (2007) Seasonal and intra-seasonal variability of chlorophyll-a in the North Pacific: model and satellite data. J Earth Simul 8:3–11 Sasaki H, Nonaka M, Masumoto Y, Sasai Y, Uehara H, Sakuma H (2008) An eddy-resolving hindcast simulation of the quasiglobal ocean from 1950 to 2003 on the Earth simulator. In: Hamilton K, Ohfuchi W (eds) High resolution numerical modelling of the atmosphere and ocean. Springer, New York, pp 157–185 Sasai Y, Richards KJ, Ishida A, Sasaki H (2010) Effects of mesoscale eddies on the marine ecosystem in the Kuroshio Extension region using an eddy-resolving coupled physical–biological model. Ocean Dyn. doi:10.1007/s10236-010-0264-8 Schneider N, Cornuelle BD (2005) The forcing of the Pacific decadal oscillation. J Climate 18:4355–4373 Schneider N, Miller A (2001) Predicting western North Pacific ocean climate. J Climate 14:3997–4002 Seager R, Kushnir Y, Naik NH, Cane MA, Miller J (2001) Wind-driven shifts in the latitude of the Kuroshio–Oyashio extension and generation of SST anomalies on decadal timescales. J Climate 14:4249–4265 Taguchi B, Xie S-P, Mitsudera H, Kubokawa A (2005) Response of the Kuroshio Extension to Rossby waves associated with the 1970s climate regime shift in a high-resolution ocean model. J Climate 18:2979–2995 Taguchi B, Xie S-P, Schneider N, Nonaka M, Sasaki H, Sasai Y (2007) Decadal variability of the Kuroshio Extension: observations and an eddy-resolving model hindcast. J Climate 20:2357–2377 Taguchi B, Nakamura H, Nonaka M, Xie S-P (2009) Atmospheric influence of the Kuroshio/Oyashio extensions simulated for the 2003/4 winter in a regional atmospheric model. J Climate 22:6536–6560 Talley LD (1988) Potential vorticity distribution in the North Pacific. J Phys Oceanogr 18:89–106 Tokinaga H, Tanimoto Y, Xie S-P, Sampe T, Tomita H, Ichikawa H (2009) Ocean frontal effects on the vertical development of clouds over the western North Pacific: in situ and satellite observations. J Climate 22:4241–4260