國立中山大學學位論文典藏.PDF

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齐剩阎
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1 Observations of Volume Transport in the Taiwan Strait

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5 Abstract Several cruises of current measurements along various cross-taiwan Strait transects were conducted by using shipboard Acoustic Doppler Current Profiler (ADCP) during The main purpose of these experiments is to obtain seasonal variations of flow structures and volume transport in the central and southern regions of the Taiwan Strait. In each cruise the semidiurnal tidal currents were eliminated from the ADCP currents by two different methods, i.e., the phase averaging method and the TSNOW calculation. The subtidal current in the Taiwan Strait generally flows in the parallel-strait direction. In summer when the southwest monsoon prevails, the water in the strait originates from the South China Sea (SCS) or the Kuroshio. This northward-flowing water is divided into two parts by the archipelago of Penghu; the majority keeps flowing northward along the Penghu Channel (PHC), the minority flows northwestward around the Penghu Island. The flows in the surface layer of the PHC reach a maximum speed of 60 cm/s or greater. In winter, strong NE winds push the fresh and cold China Coastal water southward, along the western part of the Taiwan Strait. The SCS or Kuroshio water still flows northward on the eastern part of the strait. The maximum northward current still occurs in the PHC and is around 20 cm/s or less in the winter. Our results from the phase averaging method of all six cruises indicate that the net transports along the Taiwan Strait are all flowing northward, with a maximum value of about 2.5 Sv in summer (August 2001) and a minimum value of about 0.5 Sv in winter (March 2003). The standard deviation of the volume transport is ± 0.3 Sv. Due to its greater depths and strong currents, the volume transport in the PHC amounts to approximately 75% of the total transport of the Taiwan Strait. Based on the phase averaging results, the transport is related to the along-strait 2 wind by a simple regression: Transport ( Sv) = wind stress( N / m ) , the sign convention is positive for southwesterly wind and transport. Keywords: Taiwan Strait, phase average, shipboard ADCP IV

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27 S n ( t) = k = 1 2πt A k sin Tk θ k A1 A 2 θ1 θ 2 S( t) T1 T 2 14

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56 1., (1997), (), 2., (1996), ARGOS/GPS, 3., (1997),, 4.Chuang, W. -S., (1985), Dynamics of subtidal flow in the Taiwan Strait. Journal of the Oceanographic Society Japan, 41, Chuang, W. -S., (1986), A note on the driving mechanism of current in the Taiwan Strait. Journal of Oceanographic Society Japan, 42, Chen, C.-T., (2003), Rare northward flow in the Taiwan Strait in the winter: a note. Continental Shelf Research, 23, Fang, G., Zhao, B., Zhu, Y., (1991), Water volume transport through the Taiwan Strait and the continental shelf of the East China Sea measured with current meters. In: Takano, K. (Ed.), Oceanography of Asian Marginal Seas. Elsevier, New York, Jan, S., Wang, Y. -H., Chao, S.-Y., and Wang, D.-P., (2001), Development of a Nowcast System for the Taiwan Strait (TSNOW):Numerical simulation of barotropic tides. Ocean and Polar Research, 23, Jan, S., Wang, J., Chern, C.-S., and Chao S.-Y., (2002a), Seasonal variation of the circulation in the Taiwan Strait. Journal of Marine Systems, 35, Jan, S., Chern, C.-S., and Wang. J., (2002b), Transition of tidal waves from the East to South China Seas over the Taiwan Strait: influence of the abrupt step in the topography. Journal of Oceanography, 58, Jan, S., and Chao, S.-Y., (2003), Seasonal variation of volume tran- 43

57 sport in the major inflow region of the Taiwan Strait: The Penghu Channel. Deep-Sea Research II, 50, Large, W.G. and S. Pond, (1981) Open ocean momentum flux measurements in moderate to stronger winds. Journal Of Physical Oceanography, 11, Liang, W.-D., Tang, T.-Y., Yang. Y. -J., Ko, M.-T., and Chuang, W.-S., (2003) Upper-ocean currents around Taiwan. Deep-Sea Research II, 50, Lin, S.-F., Tang, T.-Y., Jan. S., and Chen, C.-S., Taiwan Strait Current in winter. Continental Shelf Research, accepted. 15.Liu, K.-K., Tang, T.-Y., Gong, G. -C., Chen, L.-Y., Shiah, F.-K., (2000) Cross-shelf and along-shelf nutrient fluxes derived from flow fields and chemical hydrography observed in the southern East China Sea off northern Taiwan. Continental Shelf Research, 20, Tseng, R.-S., and Shen, Y. -T., (2003), Lagrangian observations of surface flow patterns in the vicinity of Taiwan. Deep-Sea Research II, 50, Wang, Y. -H., (1999), Volume transport observations in the Taiwan Strait. Abstracts of 1999 Ocean Science Meeting of the National Science Council, Taiwan, Wang, Y. -H., Jan, S., and Wang, D.-P.,(2003), Transports and tidal current estimates in the Taiwan Strait from shipboard ADCP observation ( ). Estuarine, Coastal and Shelf Science. 57, Wyrtki, K., (1961), Physical oceanography of the southeast Asia waters. Scientific results of marine investigations of the South China Sea and Gulf of Thailand , Naga Report,

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Microsoft Word - 1--齐继峰_new_.doc

Microsoft Word - 1--齐继峰_new_.doc 45 6 Vol.45, No.6 2014 11 OCEANOLOGIA ET LIMNOLOGIA SINICA Nov., 2014 * 1, 2, 3 1, 2 1, 2 1, 2 (1. 266071; 2. 266071; 3. 100049) 1956 2005 PN, NCEP,, (PDO),, 19 33Sv, 24.30Sv(1Sv=10 6 m 3 /s);, 1956 2005