Abstract
This study is a preliminary analysis of the South China Sea (SCS) deep circulations using eight quasi-global high-resolution ocean model outputs. The goal is to assess models’ ability to simulate these deep circulations. The analysis reveals that models’ deep temperatures are colder than the observations in the World Ocean Atlas, while most models’ deep salinity values are higher than the observations, indicating models’ deep water is generally colder and saltier than the reality. Moreover, there are long-term trends in both temperature and salinity simulations. The Luzon Strait transport below 1500 m is 0.36 Sv when averaged for all models, smaller compared with the observation, which is about 2.5 Sv. Four assimilated models and one unassimilated (OCCAM) display that the Luzon deep-layer overflow reaches its minimum in spring and its maximum in winter. The vertically integrated streamfunctions below 2400 m from these models show a deep cyclonic circulation in the SCS on a large scale, but the pattern is different from the diagnostic streamfunction from the U.S Navy Generalized Digital Environment Model (GDEM-Version 3.0, GDEMv3). The meridional overturning structure above 1000 m is similar in all models, but the spatial distribution and intensity below 1500 m are quite different from model to model. Moreover, the meridional overturning below 2400 m in these models is weaker than that of the GDEMv3, which indicates a deep vertical mixing process in these models is biased weak. Based on the above evaluation, this paper discusses the impacts of T/S initial value, topography, and mixing scheme on the SCS deep circulations, which may provide a reference for future model improvement.
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References
Stommel H, Arons A B. On the abyssal circulation of the world ocean — I. Stationary flow patterns on a sphere. Deep-Sea Res, 1960, 6: 140–154
Stommel H, Arons A B. On the abyssal circulation of the World Ocean—II. An idealized model of the circulation pattern and amplitude in oceanic basins. Deep-Sea Res, 1960, 6: 217–233
Broecker W S, Patzert W C, Toggweiler J R, et al. Hydrography, chemistry, and radioisotopes in the southeast Asian basins. J Geophys Res, 1986, 91: 345–354
Nitani H. Beginning of the Kuroshio, in Kuroshio: Physical aspects of the Japan Current. Seattle: University of Washington Press, 1972. 129–163
Wyrtki K. Physical oceanography of the southeast Asian waters. Naga Rep 2, 195 pp, Scripps Inst of Oceanogr, La Jolla, Calif La Jolla, California: University of California, Scripps Institution of Oceanography, 1961. 93–107
Wang J. Observation of abyssal flows in the Northern South China Sea. Acta Oceanogr Taiwan, 1986, 16: 36–45
Liu C T, Liu R J. The deep current in the Bashi Channel. Acta Oceanogr Taiwan, 1988, 20: 107–116
Qu T, Mitsudera H, Yamagata T. Intrusion of the North Pacific waters into the South China Sea. J Geophys Res, 2000, 105: 6415–6424
Qu T. Evidence of water exchange between the South China Sea and the Pacific through the Luzon Strait. Acta Oceanol Sin, 2002, 21: 175–185
Qu T, Girton J B, Whitehead J A. Deep water overflow through Luzon Stait. J Geophys Res, 2006, 111: C01002
Li L, Qu T. Thermohaline circulation in the deep South China Sea basin inferred from oxygen distributions. J Geophys Res-Oceans, 2006, 111: C05017
Tian J, Yang Q, Liang X, et al. Observation of Luzon Strait transport. Geophys Res Lett, 2006, 33: L19607
Chang Y T, Hsu W L, Tai J H, et al. Cold deep water in the South China Sea. J Oceanogr, 2010, 66: 183–190
Yang Q, Tian J, Zhao W. Observation of Luzon Strait transport in summer 2007. Deep Sea Res, Part I, 2010, 57: 670–676
Wang G, Xie S P, Qu T, et al. Deep South China Sea circulation. Geophys Res Lett, 2011, 38: L05601
Fang G, Susanto D, Soesilo I, et al. A note on the South China Sea shallow interocean circulation. Adv Atmos Sci, 2005, 22: 946–954
Sun X, Li X, Geng J, et al. Deep water bottom current deposition in the northern. Sci China Ser D-Earth Sci, 2007, 50: 1060–1066
Luedmann T, Wong H K, Berglar K. Upward flow of North Pacific Deep Water in the northern South China Sea as deduced from the occurrence of drift sediments. Geophys Res Lett, 2005, 32: L05614
Tian J W, Qu T D. Advances in research on the deep South China Sea circulation. Chin Sci Bull, 2012, 57: 3115–3120
Chao S Y, Shaw P T, Wu S Y. Deep water ventilation in the South China Sea. Deep Sea Res Part I, 1996, 43: 445–466
Yuan D. A numerical study of the South China Sea deep circulation and its relation to the Luzon Strait transport. Acta Oceanol Sin, 2002, 21: 187–202
Masumoto Y, Sasaki H, Kagimoto T, et al. A fifty-year eddyresolving simulation of the world ocean—Preliminary outcomes of OFES (OGCM for the Earth Simulator). J Earth Simulator, 2004, 1: 35–56
Thoppil P G, Richman J G, Hogan P J. Energetics of a global oceancirculation model compared to observations. Geophys Res Lett, 2011, 38: L15607
Xiu P, Chai F, Shi L, et al. A census of eddy activities in the South China Sea during 1993-2007. J Geophys Res, 2010, 115: C03012
Schiller A, Oke P R, Brassington G B, et al. Eddy-resolving ocean circulation in the Asian-Australian region inferred from an ocean reanalysis effort. Prog Oceanogr, 2008, 76: 334–365
Yu Y Q, Liu H L, Lin P F. A quasi-global 1/10° eddy-resolving ocean general circulation model and its preliminary results. Chin Sci Bull, 2012, 57: 3908–3916
Boyer T, Levitus S, Garcia H, et al. Objective analyses of annual, seasonal, and monthly temperature and salinity for the world ocean on a 0.25° grid. Int J Climatol, 2005, 25: 931–945
Carnes M R. Description and evaluation of GDEM-V3.0.2009, Washington D.: NRL Rep, 2009: NRL/MR/7330-09-9165
Canuto V M, Howard A, Cheng Y, et al. Ocean turbulence. Part I: One-point closure model—momentum and heat vertical diffusivities. J Phys Oceanogr, 2001, 31: 1413–1426
Canuto V M, Howard A, Cheng Y, et al. Ocean turbulence. Part II: Vertical diffusivities of momentum, heat, salt, mass, and passive scalars. J Phys Oceanogr, 2002, 32: 240–264
Wang D, Liu X, Wang W. et al, Simulation of meridional overturning in the upper layer of the South China Sea with an idealized bottom topography. Chin Sci Bull, 2004, 49: 740–747
Liu C J, Du Y, Zhang Q R, et al. Seasonal variation of subsurface and intermediate water masses in the South China Sea. Oceanol Limnol Sin, 2008, 39: 55–64
Holloway G. Representing topographic stress for large scale ocean models. J Phys Oceanogr, 1992, 22: 1033–1046
Alan F B, George L M. A description of a three-dimensional coastal ocean circulation model. Amer Geophys Union, 1987, 1–16
Pacanowski R C, Philander S G H. Parameterization of vertical mixing in numerical models of tropical oceans. J Phys Oceanogr, 1981, 11: 1443–1451
Large W G, McWilliams J C, Doney S C. Oceanic vertical mixing: A review and a model with a nonlocal boundary layer parameterization. Rev Geophys, 1994, 32: 363–403
Munk W, Wunsch C. Abyssal recipes II: Energetics of tidal and wind mixing. Deep Sea Res, 1998, 45: 1977–2010
Heywood K J, Garabato A C N, Stevens D P. High mixing rates in the abyssal Southern Ocean. Nature, 2002, 415: 1011–1014
Polzin K L, Toole J M, Ledwell J R, et al. Spatial variability of turbulent mixing in the abyssal ocean. Science, 1997, 276: 93–96
Ledwell J R, Watson A J, Law C S. Evidence for slow mixing across the pycnocline from an open-ocean tracerrelease experiment. Nature, 1993, 364: 701–703
Morris M Y, Hall M M, Laurent L C St, et al. Abyssal mixing in the Brazil Basin. J Phys Oceanogr, 2001, 31: 3331–3348
Laurent L C St, Simmons H L, Jayne S R. Estimates of tidally driven enhanced mixing in the deep ocean. Geophys Res Lett, 2002, 29: 2106
Tian J, Yang Q, Zhao W. Enhanced diapycnal mixing in the South China Sea. J Phys Oceanogr, 2009, 39: 3191–3203
Egbert G D, Ray R D. Significant dissipation of tidal energy in the deep ocean inferred from satellite altimeter data. Nature, 2000, 405: 775–778
Simmons H L, Jayne S R, Laurent L C St, et al. Tidally driven mixing in a numerical model of the ocean general circulation. Ocean Model, 2004, 6: 245–263
Jayne S R, Laurent L C St. Parameterizing tidal dissipation over rough topography. Geophys Res Lett, 2001, 28: 811–814
Saenko O A, Merryfield W J. On the effect of topographically enhanced mixing on the global ocean circulation. J Phys Oceanogr, 2005, 35: 826–834
Jayne S R. The impact of abyssal mixing parameterizations in an ocean general circulation model. J Phys Oceanogr, 2009, 39: 1756–1775
Nilsson J, Göran B, Gösta W. The Thermohaline circulation and vertical mixing: Does weaker density stratification give stronger overturning? J Phys Oceanogr, 2003, 33: 2781–2795
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Xie, Q., Xiao, J., Wang, D. et al. Analysis of deep-layer and bottom circulations in the South China Sea based on eight quasi-global ocean model outputs. Chin. Sci. Bull. 58, 4000–4011 (2013). https://doi.org/10.1007/s11434-013-5791-5
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DOI: https://doi.org/10.1007/s11434-013-5791-5