Abstract
We addressed the mesoscale structure variation of the central South China Sea (SCS) with the measurements by a long-lived Argo float and a high-resolution ATLAS buoy during 1998–2002. T-S diagram indicates cooling and freshening events in 2000 and 2001 with lower salinity (0.5–0.8) and lower temperature (1–1.7°C). Significant decrease in the net heat flux and increase in the precipitation suggest that the cooling and freshening is due to extra forcing by the atmosphere. Additional to large year-to-year changes, intraseasonal variability is moderate in the research area. The axis of the maximum intraseasonal temperature and salinity signals are mainly located on the thermocline. Typically, amplitude and period of intraseasonal temperature is about 2°C and 40–60 days, and that of salinity is 0.3–0.5 and 35–60 days. Rapidly-changing winds, heat flux, and precipitation are critical in controlling the intraseasonal fluctuations of the mixed layer of the area. Studies on heat and freshwater balance in the mixed-layer further suggest that horizontal advection plays an important role in intraseasonal fluctuation in the upper ocean. In addition, the energetic mesoscale propagation radiated from the east boundary is linked to the intraseasonal variability in winter.
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References
Argo Science Team, 2000. Report of the Argo Science Team 2nd Meeting (AST-2) March 7–9, 2000, Southampton Oceanography Centre, Southampton, U.K.
Argo Science Team, 2001. Argo: The global array of profiling floats. In: Koblinsky C J, Smith N R eds. Observing the Oceans in the 21st Century, GODAE Project Office, Bureau of Meteorology, Melbourne. p. 248–258
Argo Science Team, 2002. Report of the Argo Science Team 4th Meeting (AST-4) March 12–14, 2002, CSIRO Division of Marine Sciences, Hobart, Tasmania, Australia.
Holte J, Talley L. 2009. A New Algorithm for Finding Mixed Layer Depths with Applications to Argo Data and Subantarctic Mode Water Formation. Journal of Atmospheric and Oceanic Technology, 26: 1 920–1 939.
Huffman G J, Adler R F, Bolvin D T et al. 2007. The TRMM multi-satellite precipitation analysis: quasi-global, multi-year, combined-sensor precipitation estimates at fine scale. J. Hydrometeorol., 8(1): 38–55.
Liu Q Y, Yang H J, Wang Q. 2000. Dynamic characteristics of seasonal thermocline in the deep sea region of the South China Sea. Chin. J. Oceanol. Limnol., 18: 104–109.
Liu Q Y, Jia Y L, Liu P H et al. 2001. Seasonal and intraseasonal thermocline variability in the central South China Sea. Geophys. Res. Lett., 28(23): 4 467–4 470.
Liu Z H, Xu J P, Zhu B K et al. 2007. The upper ocean response to tropical cyclones in northwestern Pacific analyzed with Argo data. Chin. J. Oceanol. Limnol., 25(2): 123–131.
Morel A. 1988. Optical modeling of the upper ocean in relation to its biogenous matter content (case I waters). J. Geophys. Res., 93: 1 652–1 665.
Ohno Y, Kobayashi T, Iwasaka N et al. 2004. The mixed layer depth in the North Pacific as detected by the Argo floats. Geophys. Res. Lett., 31: L11306, doi:10.1029/2004GL0 19576.
Oka E, Suga T. 2003. Formation region of North Pacific subtropical mode water in the late winter of 2003. Geophys. Res. Lett., 30(23): 2205, doi: 10.1029/2003GL 018581.
Oka E. 2005. Long-term Sensor Drift Found in Recovered Argo Profiling Floats. Journal of Oceanography, 61: 775–781.
Parampil S R, Gera A, Ravichandran M et al. 2010 Intraseasonal response of mixed layer temperature and salinity in the Bay of Bengal to heat and freshwater flux. J. Geophys. Res., 115, C05002, doi: 10.1029/2009JC005790.
Qu T, Meyers G. 2005. Seasonal variation of barrier layer in the southeastern tropical Indian Ocean. J. Geophys. Res. 110: doi: C11003, 10.1029/2004JC002816.
Sato K, Suga T, Hanawa K. 2004. Barrier layer in the North Pacific subtropical gyre. Geophys. Res. Lett., 31: L05301, doi: 10.1029/2003GL018590.
Su Z J, Wang D, Zhang R H et al. 2008. Preliminary results of the Argo floats in the South China Sea. Oceanologia et Limnologia Sinica, 39(2): 97–104. (in Chinese with English abstract)
Su Z J, Wang D, Zhang R H. et al. 2008. Preliminary results of the Argo floats in the South China Sea. Oceanologia et Limnologia Sinica, 39(2): 97–104. (in Chinese with English abstract)
Volkov D L, Larnicol G, Dorandeu J. 2007. Improving the quality of satellite altimetry data over continental shelves. J. Geophys. Res., 112, C06020, doi: 10.1029/2006JC003765.
Wang D, Zhou F X, Li Y P. 1997. Characteristics of sea surface temperature and surface heat budget on annual cycle time scales in the South China Sea. Acta Oceanol. Sinica, 15: 111–125
Wang L P, Koblinsky C J, Howden S. 2000. Mesoscale variability in the South China Sea from the TOPEX/Poseidon altimetry data. Deep Sea Res, Part I, 47: 681–708.
Wentz F J. 1997. A well-calibrated ocean algorithm for SSM/I. J. Geophys. Res., 102: 8 703–8 718.
Wong A P S, Johnson G C. 2003. South Pacific eastern subtropical mode water. J. Phys. Oceanogr., 33: 1 493–1 509.
Xie Q, Wu X Y, Yuan W Y et al. 2007a. Life cycle of intraseasonal oscillation of summer SST in the western South China Sea. Acta Oceanol. Sinica, 3: 1–8.
Xie S P, Chang C H, Xie Q et al. 2007b. Intraseasonal variability in the summer South China Sea: wind jet, cold filament, and recirculations. J. Geophys. Res., 112: C10008, doi: 10.1029/2007JC004238
Xiu P, Chai F, Shi L et al. 2010. A census of eddy activities in the South China Sea during 1993–2007. J. Geophys. Res., 115, C03012, doi:10.1029/2009JC005657.
Xue H, Chai F, Pettigrew N et al. 2004. Kuroshio intrusion and the circulation in the South China Sea. J. Geophys. Res., 109: C02017, doi:10.1029/2002JC001724.
Yu L S, Weller R A. 2007. Objectively analyzed air-sea heat fluxes for the global ice-free ocean (1981–2005). Bull. Am. Meteorol. Soc., 88: 527–539.
Zeng L L, Shi P, Wang D et al. 2009a. Seasonal and interannual variabilities of evaporation and net fresh water flux in the South China Sea. Chinese J. Geophys., 52(4): 929–938. (in Chinese with English abstract)
Zeng L L, Du Y, Xie S P et al. 2009b. Barrier layer in the South China Sea during summer 2000. Dynamics of Atmospheres and Oceans, 47(1–3): 38–54, doi: 10.1016/j.dynatmoce.2008.08.001
Zhuang W, Xie S P, Wang D et al. 2010. Intraseasonal variability in sea surface height over the South China Sea. J. Geophys. Res., 115, C04010, doi: 10.1029/2009JC0 05647.
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Supported by the Knowledge Innovation Program of the Chinese Academy of Sciences (Nos. KZCX1-YW-12-01, KZCX2-YW-BR-04), and the Knowledge Innovation Program of the Chinese Academy of Sciences (Nos. SQ200916, SQ200809), the National Natural Science Foundation of China (No. 40806003), and the National High Technology Research and Development Program of China (863 Program) (No. 2008AA09A402)
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Zeng, L., Wang, D., Du, Y. et al. Mesoscale structure of the central South China Sea detected by SCSMEX Buoy and Argo float. Chin. J. Ocean. Limnol. 28, 1102–1111 (2010). https://doi.org/10.1007/s00343-010-0146-4
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DOI: https://doi.org/10.1007/s00343-010-0146-4