Abstract
Numerical experiments were carried out using OGCM (Ocean General Circulation Model), MOM2.2 (Modular Ocean Model Ver. 2.2), over realistic topography data, ETOPO5 (Earth Topography - 5 Minute), to investigate the interannual variability of the Kuroshio transport in 1960–2000 south of Japan; 1) the PN line located off the East China Sea, and 2) the ASUKA (Affiliated Surveys of the Kuroshio off Cape Ashizuri) line located off Cape Ashizuri. We adopted two wind datasets as driving forces of the OGCM: 1) the NCEP/NCAR (National Centers for Environmental Prediction/National Center for Atmospheric Research) reanalysis monthly mean wind stress data, and 2) the ECMWF (European Centre for Medium-range Weather Forecasts) daily wind data. In the ECMWF experiments we replaced the NCEP/NCAR data only in 1979–1993 because of the availability of the data. The OGCMs and observation basically agree on the temporal variation patterns of the transports until 1986 on the PN line with correlation coefficients of about 0.6. During the 1990s, when data were collected on the ASUKA line, the NCEP/NCAR experiments give lower correlation coefficients (less than 0.3), on both PN and ASUKA lines, while the ECMWF experiments have a higher value on the ASUKA line (0.5). One of the reasons for the disagreement between the observations and OGCMs during the 1990s might arise from the NCEP/NCAR data. An additional analysis of a wind-driven circulation was performed to examine the sensitivity of integrated Sverdrup transport along the western boundary to the propagation speed of a baroclinic Rossby wave, which is varied by stratification. A variation of the stratification, which might be induced by variability of air-sea heat and freshwater fluxes, cannot be a main cause of the disagreement.
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References
Akitomo, K., T. Awaji and N. Imasato (1991): Kuroshio pass variation south of Japan: 1. Barotropic inflow-outflow model. J. Geophys. Res., 96, 2549–2560.
Akitomo, K., M. Ooi, T. Awaji and K. Kutsuwada (1996): Interannual variability of the Kuroshio transport in response to the wind stress field over the North Pacific: Its relation to the path variation south of Japan. J. Geophys. Res., 101, 14057–14072.
Deser, C., M. A. Alexander and M. S. Timlin (1999): Evidence for a wind-driven intensification of the Kuroshio current extension from the 1970s to the 1980s. J. Climate, 12, 1697–1706.
Hinata, T. (1996): Seasonal variation and long-term trends of the oceanographic conditions along a fixed hydrographic line crossing the Kuroshio in the East China Sea. Oceanogr. Mag., 45, 9–32.
Ichikawa, H. and R. C. Beardsley (1993): Temporal and spatial variability of volume transport of the Kuroshio in the East China Sea. Deep Sea Res. I, 40, 583–605.
Ikeda, M. and J. R. Apel (1981): Mesoscale eddies detached from spatially growing meanders in an eastward-flowing oceanic jet using a two-layer quasi-geostrophic model. J. Phys. Oceanogr., 11, 1638–1661.
Imawaki, S., H. Uchida, H. Ichikawa, M. Fukazawa, S. Umatani and the ASUKA Group (2001): Satellite altimeter monitoring the Kuroshio transport south of Japan. Geophys. Res. Lett., 28, 17–20.
Ishikawa, K., Y. Takatsuki, S. Shiraishi, S. Tsubaki, A. Nakadate, T. Miyao, M. Kitano, H. Inoue, N. Kubo and J. Nishizawa (2003): Ocean variability observed along JMA's hydrographic sections and its cause. Weath. Service Bull., 70, S1–S34 (in Japanese).
Isobe, A. and S. Imawaki (2002): Annual variation of the Kuroshio transport in a two-layer numerical model with a ridge. J. Phys. Oceanogr., 32, 994–1009.
Kalnay, E. and Coauthers (1996): The NCEP/NCAR 40-Year Reanalysis Project. Bull. Amer. Meteor. Soc., 77, 437–472.
Kawabe, M. (1980): Sea level variations around the Nansei Islands and the large meander in the Kuroshio south of central Japan. J. Oceanogr. Soc. Japan, 36, 227–235.
Kawabe, M. (1995): Variations of current path, velocity, and volume transport of the Kuroshio in relation with the large meander. J. Phys. Oceanogr., 25, 3103–3117.
Kawabe, M. (2000): Calculation of interannual variations of sea level in the subtropical North Pacific. J. Oceanogr., 56, 691–706.
Kawabe, M. (2001): Interannual variations of sea level at the Nansei Islands and volume transport of the Kuroshio due to wind changes. J. Oceanogr., 57, 189–205.
Levitus, S. (1982): Climatological atlas of the world ocean. NOAA Prof. Pap., 13, U.S. Government Printing Office, Washington, D.C., 173 pp.
Macdonald, A. M. and C. Wunsch (1996): An estimate of global ocean circulation and heat fluxes. Nature, 382, 436–439.
Mantua, N. J. and S. R. Hare (2002): The pacific decadal oscillation. J. Oceanogr., 58, 35–44.
Masuda, A. (1982): An interpretation of the bimodal character of the stable Kuroshio path. Deep Sea Res. A, 29, 471–484.
Minobe, S. (2000): Spatio-temporal structure of the pentadecadal variability over the North Pacific. Prog. Oceanogr., 47, 381–408.
Nitani, H. (1972): Begining of the Kuroshio. p. 217–234. In Kuroshio-Its Physical Aspects, ed. by H. Stommel and K. Yoshida, Univ. of Tokyo Press.
Pacanowski, R. C. (1996): MOM 2.2 ?, documentation, user's guide and reference manual. GFDL Ocean Technical Report 3.2, Geophysical Fluid Dynamics Laboratory, Princeton, 329 pp.
Qiu, B. and T. M. Joyce (1992): Interannual variability in the mid-and low-latitude Western North Pacific. J. Phys. Oceanogr., 22, 1062–1084.
Qiu, B. and W. Miao (2000): Kuroshio path variations south of Japan: bimodality as a self-sustained internal oscillation. J. Phys. Oceanogr., 30, 2124–2137.
Rosati, A. and K. Miyakoda (1988): A general circulation model for upper ocean simulation. J. Phys. Oceanogr., 18, 1601–1626.
Saiki, M. (1982): Relation between the geostrophic flux of the Kuroshio in the Eastern China Sea and its large-meanders in south of Japan. Oceanogr. Mag., 32, 11–18.
Smagorinsky, J. (1963): General circulation experiments with the primitive eqations: I. The basic experiment. Mon. Wea. Rev., 91, 99–164.
Smith, S. D. (1981): Coefficients for sea-surface wind stress and heat exchange. Report series of Bedford Institute of Oceanography, Dartmouth, Nova Scotia, Canada, December.
Tanaka, K. and M. Ikeda (2004): Propagation of Rossby waves over ridges excited by interannual wind forcing in a western North Pacific model. J. Oceanogr., 60, this issue, 329–340.
Tanaka, K., M. Ikeda and Y. Masumoto (2004): Predictability of interannual variability in the Kuroshio transport south of Japan based on wind stress data over the North Pacific. J. Oceanogr., 60, this issue, 283–291.
Uchida, H. and S. Imawaki (2004): Ten-year record of the Kuroshio transport south of Japan estimated from satellite altimeter data (in preparation).
Vonder Haar, T. H. and A. H. Oort (1973): New estimate of annual poleward energy transport by northern hemisphere oceans. J. Phys. Oceanogr., 3, 169–172.
White, W. B. and J. P. McCreary (1976): On the formation of the Kuroshio meander and its relationship to the large-scale ocean circulation. Deep Sea Res. and Oceanogr. Abst., 23, 33–47.
Yoon, J.-H. and I. Yasuda (1987): Dynamics of the Kuroshio large meander: Two layer model. J. Phys. Oceanogr., 17, 66–81.
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Yoshinari, H., Ikeda, M., Tanaka, K. et al. Sensitivity of the Interannual Kuroshio Transport Variation South of Japan to Wind Dataset in OGCM Calculation. Journal of Oceanography 60, 341–350 (2004). https://doi.org/10.1023/B:JOCE.0000038340.05301.37
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DOI: https://doi.org/10.1023/B:JOCE.0000038340.05301.37