Abstract
The seasonal variabilities of a latent-heat flux (LHF), a sensible-heat flux (SHF) and net surface heat flux are examined in the northern South China Sea (NSCS), including their spatial characteristics, using the in situ data collected by ship from 2006 to 2007. The spatial distribution of LHF in the NSCS is mostly controlled by wind in summer and autumn owing to the lower vertical gradient of air humidity, but is influenced by both wind and near-surface air humidity vertical gradient in spring and winter. The largest area-averaged LHF is in autumn, with the value of 197.25 W/m2, followed by that in winter; the third and the forth are in summer and spring, respectively. The net heat flux is positive in spring and summer, so the NSCS absorbs heat; and the solar shortwave radiation plays the most important role in the surface heat budget. In autumn and winter, the net heat flux is negative in most of the observation region, so the NSCS loses heat; and the LHF plays the most important role in the surface heat budget. The net heating is mainly a result of the offsetting between heating due to the shortwave radiation and cooling due to the LHF and the upward (outgoing) long wave radiation, since the role of SHF is negligible. The ratio of the magnitudes of the three terms (shortwave radiation to LHF to long-wave radiation) averaged over the entire year is roughly 3:2:1, and the role of SHF is the smallest.
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Chen Jau-Ming, Chang C-P, Li T im. 2003. Annual cycle of the South China Sea surface temperature using the NCEP/NCARrReanalysis. Journal of the Meteorological Society of Japan, 81: 879–884
Chen Yide, Jiang Guorong, Zhang Ren, et al. 2005. Analysis and comparison of air-sea flux in the northern South China Sea(SCS) during the monsoon onset in 2002. Chinese Journal of Atmospheric Sciences, 29(5): 761–770
Chou Shu-Hsien, Chou Ming-Dah, Chan Pui-King. 2004. Tropical warm pool surface heat budgets and temperature: contrasts between 1997/98 El Niño and 1998/99 La Niña. J Climate, 17: 1845–1858
Dale W L. 1956. Wind and drift currents in the South China Sea. Deep-Sea Res, 43(4): 445–466
Frankignoul C, Kestenare E. 2002. The surface heat flux feedback: Part I. Estimates from observations in the Atlantic and the North Pacific. Climate, Dynamics, 19: 633–647
Gao Zhiqiu, Wang Qing, Wang Shouping. 2006. An alternative approach to sea surface aerodynamic roughness. J Geophys Res, 111: D22108, doi:10.1029/2006JD007323
Gao Zhiqiu, Wang Linlin, Xueyan Bi, et al. 2012. A simple extension of “an alternative approach to sea surface aerodynamic roughness.” J Geophys Res, 117: 20, doi:10.1029/2012JD017478
Hu J Y, Kawamura H, Hong H S. 2000. A review on the currents in the South China Sea-Seasonal circulation, South China Sea Warm Current and Kuroshio intrusion. J Oceanogr, 56: 607–624
Krishnamurti T N, Dosterhof D, Mehta A. 1988. Air-sea interaction on the time scale of 30C50 days. J Atmos Sci, 45: 1304–1322
Oberhuber J M. 1988. An atlas based on the “COADS” data set: the budgets of heat, buoyancy and turbulent kinetic energy at the surface of global ocean. Rep 15. Hamburg, Germany: Max Plank Inst für Meteorol
Qu Tangdong. 2001. Role of ocean dynamics in determining the mean seasonal cycle of the South China Sea surface temperature. J Geophys Res, 106(C4): 6943–6955
Stuart D S, Christopher W F, Gerald L G, et al. 1996. Air-sea fluxes: 25 years of progress. Boundary-Layer Meteorology, 78: 247–290
Wang Dongxiao, Zhou Faxiu, Li Yongping. 1997. Characteristics of sea surface temperature and surface heat budget on annual cycle time scales in the South China Sea. Acta Oceanologica Sinica, 15: 111–125
Wang Yongsheng. 1987. Atmospheric Physics. Beijing: China Meteorological Press, 346–348
Wyrtki K. 1961. Scientific results of marine investigations of the South China Sea and the Gulf of Thailand 1959–1961 physical oceanography of the southeast Asia waters. NAGA Report 2. La Jolla, Calif: Scripps Inst of Oceanogr, 195
Yu Lisan, Jin Xiangze, Weller Robert A. 2007. annual, seasonal, and interannual variability of air-sea heat (fluxes in the Indian Ocean). J Climate, 20: 3190–3209
Zeng Lili, Shi, Ping, Liu W Timothy, et al. 2009. Evaluation of a satellite-derived latent heat flux product in the South China Sea: A comparison with moored buoy data and various products. Atmospheric Research, 94: 91–105
Zeng Lili, Wang Dongxiao. 2009. Intraseasonal variability of latent-heat flux in the South China Sea. Theoretical and Applied Climatology, 97: 53–64
Zhang Guangjun, McPhaden M J. 1995. The relationship between sea surface temperature and latent heat flux in the equatorial Pacific. J Climate, 8: 589–605
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Foundation item: This study was supported by the National Natural Basic Research Program (“ 973” Program) of China, under contract No. 2011CB403504 and No. 2011CB403501; the Marine Science Foundation for Young Scientists of State Oceanic Administration of China No. 2012221; the National Natural Science Foundation of China under contract No. 40806003; and the Knowledge Innovation Project for Distinguished Young Scholar of the Chinese Academy of Sciences of China under contract No.KZCX2-EW-QN203.
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Zhang, Y., Wang, D., Xia, H. et al. The seasonal variability of an air-sea heat flux in the northern South China Sea. Acta Oceanol. Sin. 31, 79–86 (2012). https://doi.org/10.1007/s13131-012-0238-4
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DOI: https://doi.org/10.1007/s13131-012-0238-4