Abstract
This paper describes a reanalysis of the variability of water mass properties and currents in the western North Pacific using an ocean forecast system, Japan Coastal Ocean Predictability Experiment 2 (JCOPE2), to provide the basic description and information about the quality for data users. We have created the reanalysis data with high horizontal resolution of 1/12° to describe the oceanic variability associated with the Kuroshio-Kuroshio Extension, the Oyashio, and the mesoscale eddies from 1993 to 2007. The products made by an eddy-resolving ocean model combined with the three-dimensional variational data assimilation well reproduced the mean water mass property in the western North Pacific and the interannual variations of the Kuroshio-Kuroshio Extension and the Oyashio coastal branch. From the reanalysis data, we found that both the mean kinetic energy of the Kuroshio Extension axis at the first meandering crest and southward intrusion of the Oyashio coastal branch were closely related with the horizontal distribution of both the Oyashio Water and North Pacific Intermediate Water within the appropriate interannual time scale. The reanalysis data also indicated that the north-south migration of the Kuroshio Extension associated with its regime transitions affected the decadal modulation of the Subtropical Mode Water formation in the recirculation gyre of the Kuroshio Extension.
Similar content being viewed by others
References
Ambe, D., S. Imawaki, H. Uchida and K. Ichikawa (2004): Estimating the Kuroshio axis south of Japan using combination of satellite altimetry and drifting buoys. J. Oceanogr., 60, 375–382.
Bloom, S. C., L. L. Takacs, A. M. da Silva and D. Ledvina (1996): Data assimilation using Increment Analysis Updates. Mon. Wea. Rev., 124, 1256–1271.
Boris, J. P. and D. L. Book (1973): Flux-corrected transport I: SHASTA, a fluid transport algorithm that works. J. Comput. Phys., 11, 38–69.
Boyer, T. P., J. I. Antonov, H. E. Garcia, D. R. Johnson, R. A. Locarnini, A. V. Mishonov, M. T. Pitcher, O. K. Baranova and I. V. Smolyar (2006): World Ocean Database 2005. NOAA Atlas NESDIS 60, Ed. by S. Levitus, U.S. Government Printing Office, Washington, D.C., 190 pp., DVDs.
Carton, J. A. and A. Santorelli (2008): Global decadal upper-ocean heat content as viewed in nine analyses. J. Climate, 21, 6015–6035.
Conkright, M. E., J. I. Antonov, O. Baranova, T. P. Boyer, H. E. Garcia, R. Gelfeld, D. Johnson, R. A. Locarnini, P. P. Murphy, T. D. O’Brien, I. Smolyar and C. Stephens (2002): World Ocean Database 2001, Volume 1: Introduction. NOAA Atlas NESDIS 42, ed. by S. Levitus, U.S. Government Printing Office, Washington, D.C., 167 pp.
Daley, R. (1991): Atmospheric Data Analysis. Cambridge University Press, New York, 472 pp.
Ebuchi, N., Y. Fukamachi, K. Ohshima, K. Shirasawa, M. Ishikawa, T. Takatsuka, T. Daibo and M. Wakatsuchi (2006): Observation of the Soya Warm Current using HF Ocean Radar. J. Oceanogr., 62, 47–61.
Ezer, T. and G. L. Mellor (1994): Continuous assimilation of Geosat altimeter data into a three-dimensional primitive equation Gulf Stream model. J. Phys. Oceanogr., 24, 832–847.
Feder, T. (2000): Argo begins systematic global probing of the upper oceans. Phys. Today, 53, DOI:10.1063/1.1292477.
Fujii, Y. and M. Kamachi (2003): A reconstruction of observed profiles in the sea east of Japan using vertical coupled temperature-salinity EOF modes. J. Oceanogr., 59, 173–186.
Griffies, S. M. and R. W. Hallberg (2000): Biharmonic friction with a Smagorinsky-like viscosity for use in large-scale eddy-permitting ocean models. Mon. Wea. Rev., 128, 2935–2946.
Guo, X., H. Hukuda, Y. Miyazawa and T. Yamagata (2003): A triply nested ocean model simulating the Kuroshio—Roles of horizontal resolution on JEBAR—. J. Phys. Oceanogr., 33, 146–169.
Hasunuma, K. (1978): Formation of the intermediate salinity minimum in the northwestern Pacific Ocean. Bull. Ocean Res. Inst., Univ. of Tokyo, 9, 47 pp.
Hinada, 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., H. Nakamura, A. Nishina and M. Higashi (2004): Variability of northeastward current southeast of northern Ryukyu Islands. J. Oceanogr., 60, 351–363.
Imawaki, S., H. Uchida, H. Ichikawa, M. Fukasawa, S. Umatani and ASUKA Group (2001): Satellite altimeter monitoring the Kuroshio transport south of Japan. Geophys. Res. Lett., 28(1), 17–20.
Ishizaki, H. and I. Ishikawa (2004): Simulation of formation and spreading of salinity minimum associated with NPIW using a high-resolution model. J. Oceanogr., 60, 463–485.
Japan Meteorological Agency (2006): ’2.2.3 Oyashio’. In Japan Meteorological Agency Comprehensive Oceanographic Information (in Japanese). https://doi.org/www.data.kishou.go.jp/kaiyou/shindan/sougou/pdf/S22_2.2.3.pdf
Kagimoto, T., Y. Miyazawa, X. Guo and H. Kawajiri (2008): High resolution Kuroshio forecast system—Description and its applications—. p. 209–234. In High Resolution Numerical Modeling of the Atmosphere and Ocean, ed. by W. Ohfuchi and K. Hamilton, Springer, New York.
Kalnay, E. and Coauthors (1996): The NCEP/NCAR 40-year reanalysis project. Bull. Amer. Meteor. Soc., 77, 437–471.
Kuragano, T. and M. Kamachi (1999): Global statistical space-time scales of oceanic variability estimated from the TOPEX/POSEIDON altimetry data. J. Geophys. Res., 105, 955–974.
Masuzawa, J. (1969): Subtropical Mode Water. Deep-Sea Res., 16, 463–472.
McCalpin, J. D. (1994): A comparison of second-order and fourth-order pressure gradient algorithms in a sigma coordinate ocean model. Int. J. Num. Methods Fluids, 18, 361–383.
Mellor, G., T. Ezer and L.-Y. Oey (1994): The pressure gradient conundrum of sigma coordinate ocean models. J. Atmos. Oceanic Technol., 11, 1126–1134.
Mellor, G. L., S. Hakkinen, T. Ezer and R. Patchen (2002): A generalization of a sigma coordinate ocean model and an intercomparison of model vertical grids. p. 55–72. In Ocean Forecasting: Conceptual Basis and Applications, ed. by N. Pinardi and J. D. Woods, Springer, New York.
Mitsudera, H., B. Taguchi, Y. Yoshikawa, H. Nakamura, T. Waseda and T. Qu (2004): Numerical study on the Oyashio water pathways in the Kuroshio-Oyashio Confluence. J. Phys. Oceanogr., 34, 1174–1196.
Miyao, T. and K. Ishikawa (2003): Formation, distribution and volume transport of the North Pacific Intermediate Water studied by repeat hydrographic observations. J. Oceanogr., 59, 905–919.
Miyazawa, Y. (2007): Development of numerical ocean forecasting technique—Kuroshio, Oyashio, and the Indian Ocean—. Suiro (Hydorology), 142, 22–34 (in Japanese).
Miyazawa, Y., X. Guo and T. Yamagata (2004): Roles of mesoscale eddies in the Kuroshio paths. J. Phys. Oceanogr., 34, 2203–2222.
Miyazawa, Y., S. Yamane, X. Guo and T. Yamagata (2005): Ensemble forecast of the Kuroshio meandering. J. Geophys. Res., 110, C10026, doi:10.1029/2004JC002426.
Miyazawa, Y., T. Kagimoto, X. Guo and H. Sakuma (2008a): The Kuroshio large meander formation in 2004 analyzed by an eddy-resolving ocean forecast system. J. Geophys. Res., 113, C10015, doi:10.1029/2007JC004226.
Miyazawa, Y., K. Komatsu and T. Setou (2008b): Nowcast skill of the JCOPE2 ocean forecast system in the Kuroshio-Oyashio mixed water region. J. Marine Meteorol. Society (Umi to Sora), 84, 85–91 (in Japanese with English abstract and figure captions).
Mizuno, K. and W. B. White (1983): Annual and interannual variability in the Kuroshio Current system. J. Phys. Oceanogr., 13, 1847–1867.
Nakano, T., I. Kaneko, M. Endoh and M. Kamachi (2005): Interannual and decadal variabilities of NPIW salinity minimum core observed along JMA’s hydrographic repeat sections. J. Oceanogr., 61, 681–697.
Oey, L-.Y. and P. Chen (1992): A nested-grid ocean model: with application to the simulation of meanders and eddies in the Norwegian Coastal Current. J. Geophys. Res., 97, 20,063–20,086.
Qiu, B. and S. Chen (2006): Decadal variability in the formation of the North Pacific Subtropical Mode Water: Oceanic versus atmospheric control. J. Phys. Oceanogr., 36, 1365–1380.
Qiu, B., S. Chen and P. Hacker (2007): Effect of mesoscale eddies on Subtropical Mode Water variability from the Kuroshio Extension System Study (KESS). J. Phys. Oceanogr., 37, 982–1000.
Reid, J. L.,Jr. (1965): Intermediate waters of the Pacific Ocean. The Johns Hopkins Oceanographic Studies, 5, 96 pp.
Shikama, N. (1994): Current measurement in the Tsugaru Strait using bottom-mounted ADCPs. Kaiyo Monthly, 26, 815–818 (in Japanese).
Shimizu, Y., T. Iwao, I., Yasuda, S. Ito, T. Watanabe, K. Uehara, N. Shikama and T. Nakano (2004): Formation process of North Pacific Intermediate Water revealed by profiling floats set to drift on 26.7σϑ isopycnal surface. J. Oceanogr., 60, 453–46
Storch, H. and F. Zwiers (1999): Statistical Analysis in Climate Research. Cambridge University Press, Cambridge, 484 pp.
Suga, T. and K. Hanawa (1995a): The subtropical mode water circulation in the North Pacific. J. Phys. Oceanogr., 25, 958–970.
Suga, T. and K. Hanawa (1995b): Interannual variations of North Pacific Subtropical Mode Water in the 137°E section. J. Phys. Oceanogr., 25, 1012–1017.
Takikawa, T., J. H. Yoon and K. D. Cho (2005): The Tsushima warm current through Tsushima straits estimated from ferryboat ADCP data. J. Phys. Oceanogr., 35, 1154–1168.
Talley, L. D. (1993): Distribution and formation of North Pacific Intermediate Water. J. Phys. Oceanogr., 23, 517–537.
Tatebe, H. and I. Yasuda (2004): Oyashio southward intrusion and cross-gyre transport related to diapycnal upwelling in the Okhotsk Sea. J. Phys. Oceanogr., 34, 2327–2341.
Uchida, H. and S. Imawaki (2003): Eulerian mean surface velocity field derived by combing drifter and satellite altimeter data. Geophys. Res. Lett., 30, 1229, doi:10.1029/2002GL016445.
Uda, M. (1963): Oceanography of the subarctic Pacific region. J. Fish. Res. Board Can., 20, 119–179.
Uehara, K., Y. Saito and K. Hori (2002): Paleotidal regime in the Changjiang (Yangtze) Estuary, the East China Sea, and the Yellow Sea at 6 ka and 10 ka estimated from a numerical model. Mar. Geol., 183, 179–192.
Uehara, K., S. Ito, H. Miyake, I. Yasuda, Y. Shimizu and T. Watanabe (2004): Absolute volume transports of the Oyashio referred to moored current meter data crossing the OICE. J. Oceanogr., 60, 397–409.
Usui, N., S. Ishizaki, Y. Fujii, H. Tsujino, T. Yasuda and M. Kamachi (2006): Meteorological Research Institute multivariate ocean variational estimation (MOVE) system: Some early results. Adv. Space Res., 37, 806–822, doi:10.1016/j.asr.2005.09.022.
Wang, Y. H., S. Jan and D. P. Wang (2003): Transports and tidal current estimates in the Taiwan Strait from shipboard ADCP observations (1999–2001). Estuar., Coast. Shelf Sci., 57, 193–199.
Yasuda, I. (1997): The origin of the North Pacific Intermediate Water. J. Geophys. Res., 102, 893–909.
Yasuda, I. (2003): Hydrographic structure and variability in the Kuroshio-Oyashio transition area. J. Oceanogr., 59, 389–402.
Yasuda, I., K. Okuda and Y. Shimizu (1996): Distribution and modification of the North Pacific Intermediate Water in the Kuroshio-Oyashio Interfrontal zone. J. Phys. Oceanogr., 26, 448–465.
Yoshida, K. (1964): A note on the variations of the Kuroshio during recent years. Bull. Jpn. Soc. Fish Oceanogr., 5, 66–69 (in Japanese).
Yoshinari, H., I. Yasuda and M. Ikeda (2004): Meridional transport of North Pacific Intermediate Water across 37°N based on an objective analysis of lowered acoustic Doppler current profiler data. J. Geophys. Res., 109, C02023, doi:10.1029/2003JC001815.
Yoshinari, H., T. Setou, A. Okuno, D. Ambe, K. Komatsu, Y. Miyazawa and FRA-JCOPE group (2008): Impact evaluation of Argo data for reproducibility of FRA-JCOPE. J. Marine Meteorol. Society (Umi to Sora), 84, 77–84 (in Japanese with English abstract and figure captions).
Zhu, X.-H., I.-S. Han, J.-H. Park, H. Ichikawa, K. Murakami, A. Kaneko and A. Ostrovskii (2003): The northeastward current southeast of Okinawa Island observed during November 2000 to August 2001. Geophys. Res. Lett., 30(2), 1071, doi:10.1029/2002GL015867.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Miyazawa, Y., Zhang, R., Guo, X. et al. Water mass variability in the western North Pacific detected in a 15-year eddy resolving ocean reanalysis. J Oceanogr 65, 737–756 (2009). https://doi.org/10.1007/s10872-009-0063-3
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10872-009-0063-3