Abstract
The effect of river runoff on the salinity distribution in the coastal regions of Japan is investigated with a nested-grid model system. High-resolution river runoff data calculated by a hydrological cycle model are used in this study. Freshwater fluxes from rivers result in extremely low salinity waters along the coast of Japan. Fixed line observations conducted by prefectural fisheries research institutes show that such low salinity waters also exist in the real ocean. The use of the river runoff data noted above leads to reduction in root mean square errors (RMSEs) of sea surface salinity between observational data and the model result. The model experiments also show that freshwater inputs from large rivers can affect the salinity distribution far away from their mouths, which suggests that we should care about such rivers far away from the area of interest as well as local rivers. The experiment with runoff from non-Class-A rivers shows the smaller RMSE than the experiment without river runoff. Such small rivers also contribute a lot to improving reproducibility of the salinity distribution in the coastal areas. These results clearly show that precise data for river discharge are essential for realistic coastal modeling.
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Antonov JI, Seidov D, Boyer TP, Locarnini RA, Mishonov AV, Garcia HE, Baranova OK, Zweng MM, Johnson DR (2010) World Ocean Atlas 2009 volume 2: salinity. In: Levitus S (ed) NOAA Atlas NESDIS, vol 69. U.S. Gov. Printing Office, Washington, D.C., p 184
Avicola G, Huq P (2003a) The characteristics of the recirculating bulge region in coastal buoyant outflows. J Mar Res 61(4):435–463
Avicola G, Huq P (2003b) The role of outflow geometry in the formation of the recirculating bulge region in coastal buoyant outflows. J Mar Res 61(4):411–434
Chérubin LM (2014) High-resolution simulation of the circulation in the Bahamas and Turks and Caicos Archipelagos. Progr Oceanogr 127:21–46
Danabasoglu G, Yeager SG, Bailey D, Behrens E, Bentsen M, Bi D, Biastoch A, Böning C, Bozec A, Canuto VM, Cassou C, Chassignet E, Coward AC, Danilov S, Diansky N, Drange H, Farneti R, Fernandez E, Fogli PG, Forget G, Fujii Y, Griffies SM, Gusev A, Heimbach P, Howard A, Jung T, Kelley M, Large WG, Leboissetier A, Lu J, Madec G, Marsland SJ, Masina S, Navarra A, Nurser AG, Pirani A, y Mélia DS, Samuels BL, Scheinert M, Sidorenko D, Treguier AM, Tsujino H, Uotila P, Valcke S, Voldoire A, Wang Q (2014) North Atlantic simulations in coordinated ocean-ice reference experiments phase II (CORE-II). Part I: Mean states. Ocean Model 73:76–107
Fong DA, Geyer WR (2002) The alongshore transport of freshwater in a surface-trapped river plume. J Phys Oceanogr 32:957–972
Garvine RW (2001) The impact of model configuration in studies of buoyant coastal discharge. J Mar Res 59:193–225
Griffies SM, Hallberg RW (2000) Biharmonic friction with a Smagorinsky-like viscosity for use in large-scale eddy-permitting ocean models. Mon Weather Rev 128:2935–2946
Griffies SM, Yin J, Durack PJ, Goddard P, Bates SC, Behrens E, Bentsen M, Bi D, Biastoch A, Böning CW, Bozec A, Chassignet E, Danabasoglu G, Danilov S, Domingues CM, Drange H, Farneti R, Fernandez E, Greatbatch RJ, Holland DM, Ilicak M, Large WG, Lorbacher K, Lu J, Marsland SJ, Mishra A, Nurser AG, y Mélia DS, Palter JB, Samuels BL, Schröter J, Schwarzkopf FU, Sidorenko D, Treguier AM, heng Tseng Y, Tsujino H, Uotila P, Valcke S, Voldoire A, Wang Q, Winton M, Zhang X, (2014) An assessment of global and regional sea level for years 1993–2007 in a suite in interannual CORE-II simulations. Ocean Model 78:35–89
Hasumi H (2006) CCSR Ocean Component Model (COCO) version 4.0. CCSR report 25, Center for Climate System Research, University of Tokyo
Hickey BM, Pietrafesa LJ, Jay DA, Boicourt WC (1998) The Columbia River plume study: subtidal variability in the velocity and salinity fields. J Geophys Res 103(C5):10339–10368
Ishizaki H, Motoi T (1999) Reevaluation of the Takano–Oonishi scheme for momentum advection on bottom relief in ocean models. J Atmos Ocean Technol 16(12):1994–2010
Komuro Y, Suzuki T, Sakamoto TT, Hasumi H, Ishii M, Watanabe M, Nozawa T, Yokohata T, Nishimura T, Ogochi K, Emori S, Kimoto M (2012) Sea-ice in twentieth-century simulations by new MIROC coupled models: a comparison between models with high resolution and with ice thickness distribution. J Meteorol Soc Jpn 90A:213–232. doi:10.2151/jmsj.2012-A11
Kurapov AL, Foley D, Strub PT, Egbert GD, Allen JS (2011) Variational assimilation of satellite observations in a coastal ocean model off Oregon. J Geophys Res 116(C05):006
Kurogi M, Hasumi H, Tanaka Y (2013) Effects of stretching on maintaining the Kuroshio meander. J Geophys Res 118:1182–1194. doi:10.1002/jgrc.20123
Large WG, Yeager SG (2004) Diurnal to decadal global forcing for ocean and sea-ice models: the data sets and flux climatologies. Technical report TN-460+STR, NCAR
Large WG, Yeager SG (2009) The global climatology of an interannually varing air-sea flux data set. Clim Dyn 33(2–3):341–364
Leonard B (1979) A stable and accurate convective modelling procedure based on quadratic upstream interpolation. Comput Method Appl Mech Eng 19(1):59–98
Leonard B, MacVean M, Lock A (1994) The flux-integral method for multidimensional convection and diffusion. Technical Memorandum 106679, NASA
Locarnini RA, Mishonov AV, Antonov JI, boyer TP, Garcia HE, Baranova OK, Zweng MM, Johnson DR (2010) World Ocean Atlas 2009 volume 1: temperature. In: Levitus S (ed) NOAA Atlas NESDIS, vol 68. U.S. Gov. Printing Office, Washington, D.C., p 184
Miyazawa Y, Miyama T, Varlamov SM, Guo X, Waseda T (2012) Open and coastal seas interactions south of Japan represented by an ensemble Kalman filter. Ocean Dyna 62:645–659
Miyazawa Y, Masumoto Y, Varlamov SM, Miyama T, Takigawa M, Honda M, Saino T (2013) Inverse estimation of source parameters of oceanic radioactivity dispersion models associated with the Fukushima accident. Biogeosciences 10:2349–2363
Naganuma K (2000) The Sea of Japan as the natural environment of marine organisms. Bull Jpn Sea Natl Fish Res Inst 50:1–42
Nakada S, Ishikawa Y, Awaji T, In T, Shima S, Nakayama T, Isada T, Saitoh SI (2012) Modeling runoff into a region of freshwater influence for improved ocean prediction: application to Funka Bay. Hydrol Res Lett 6:47–52
Nishida Y, Kanomata I, Tanaka I, Sato S, Takahashi S, Matsubara H (2003) Seasonal and interannual variations of the volume transport through the Tsugaru Strait. Oceanogr Jpn 12(5):487–499
Noh Y, Kim HJ (1999) Simulations of temperature and turbulence structure of the oceanic boundary layer with the improved near-surface process. J Geophys Res 104(C7):15621–15634
Oki T, Nishimura T, Dirmeyer P (1999) Assessment of annual runoff from land surface models using total runoff integrating pathways (TRIP). J Meteorol Soc Jpn 77(1B):235–255
River Bureau, Ministry of Land, Infrastructure, Transport and Tourism (2007) River Administration in Japan. http://www.mlit.go.jp/river/basic_info/english/pdf/RiverAdministrationInJapan(e).pdf
Roach AT, Aagaard K, Pease CH, Salo SA, Weingartner T, Pavlov V, Kulakov M (1995) Direct measurements of transport and water properties through the Bering Strait. J Geophys Res 100(C9):18443–18457
Takikawa T, Yoon JH, Cho KD (2005) The Tsushima warm current through Tsushima straits estimated from Ferryboat ADCP data. J Phys Oceanogr 35:1154–1168
Taniguchi M (2000) A critical review of global studies on groundwater—scale-up of groundwater studies in time and space. J Jpn Soc Hydrol Water Resour 13(6):476–485
Taniguchi M, Burnett WC, Cable JE, Turner JV (2002) Investigation of submarine groundwater discharge. Hydrol Process 16(11):2115–2129
Tanioka K (1962) The oceanographical conditions of Japan-Sea (1)—on the annual variations of chlorinity. Umi to Sora 38(3):90–100
Tsujino H, Hirabara M, Nakano H, Yasuda T, Motoi T, Yamanaka G (2011) Simulating present climate of the global ocean-ice system using the Meteorological Research Institute Community Ocean Model (MRI.COM): simulation characteristics and variability in the Pacific sector. J Oceanogr 67:449–479
Uda M (1934) Hydrographical research on the normal monthly conditions in the Japan Sea, the Yellow Sea, and the Okohotsk Sea. J Imp Fish Exp Stn 5:191–236
Whitney MM, Garvine RW (2005) Wind influence on a coastal buoyant outflow. J Geophys Res 110(C03014). doi:10.1029/2003JC002261
Whitney MM, Garvine RW (2006) Simulating the Delaware Bay buoyant outflow: comparison with observations. J Phys Oceanogr 36:3–21
Woodgate RA, Aagaard K, Weingartner TJ (2005) Monthly temperature, salinity, and transport variability of the Bering Strait through flow. Geophys Res Lett 32(L04):601. doi:10.1029/2004GL021880
Yankovsky AE, Chapman DC (1997) A simple theory for the fater of buoyant coastal discharges. J Phys Oceanogr 27:1386–1401
Yokouchi K, Kaga Y, Ueda K, Matsumoto I, Ogishima T, Yamada H (1998) Observations and simulation of annual Plankton cycles off the Sanriku Coast and in Sendai Bay (in Japanese). Bull Tohoku Natl Fish Res Inst 60:1–14
Yoshimura K, Miyazaki S, Kanae S, Oki T (2006) Iso-MATSIRO, a land surface model that incorporates stable water isotopes. Glob Planet Change 51:90–107
Yoshimura K, Sakimura T, Oki T, Kanae S, Seto S (2008) Toward flood risk prediction: a statistical approach using a 29-year river discharge simulation over Japan. Hydrol Res Lett 2:22–26
Acknowledgments
The authors appreciate thoughtful and constructive comments from two anonymous reviewers, which significantly improve the quality of this paper. This study is supported by Tohoku Ecosystem-Associated Marine Sciences from Ministry of Education, Culture, Sports, Science, and Technology of Japan. The numerical experiments are conducted using the Fujitsu PRIMEHPC FX10 System (Oakleaf-FX, Oakbridge) in the Information Technology Center, the University of Tokyo. Authors would like to express heartfelt respects and gratitude to all public research institutes, including two institutes and one center cited in the text, which manage fixed line observation in the coastal regions of Japan.
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Urakawa, L.S., Kurogi, M., Yoshimura, K. et al. Modeling low salinity waters along the coast around Japan using a high-resolution river discharge dataset. J Oceanogr 71, 715–739 (2015). https://doi.org/10.1007/s10872-015-0314-4
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DOI: https://doi.org/10.1007/s10872-015-0314-4