Climatology and seasonal variability of the Mindanao Undercurrent based on OFES data
The simulation of an ocean general circulation model for the earth simulator (OFES) is transformed to an isopycnal coordinate to investigate the spatial structure and seasonal variability of the Mindanao Undercurrent (MUC). The results show that (1) potential density surfaces, σθ=26.5 and σθ=27.5, can be chosen to encompass the MUC layer. Southern Pacific tropical water (SPTW), Antarctic Intermediate Water (AAIW) and high potential density water (HPDW) constitute the MUC. (2) Climatologically, the MUC exists in the form of dual-core. In some months, the dual-core structure changes to a single-core structure. (3) Choosing section at 8°N for calculating the transport of the MUC transport is reliable. Potential density constraint provides a good method for calculating the transport of the MUC. (4) The annual mean transport of the MUC is 8.34×106 m3/s and varies considerably with seasons: stronger in late spring and weaker in winter.
Key wordsMindanao Undercurrent southern Pacific tropical water Antarctic intermediate water
Unable to display preview. Download preview PDF.
- Gu D J, Wang D X, Li C H, et al. 2004. Analysis of interdecadal variation of tropical Pacific thermocline based on assimilated data. Acta Oceanologica Sinica, 23(1): 61–72Google Scholar
- Hu D, Cui M. 1989. The western boundary current in the far-western Pacific Ocean. In: Picaut J, Lukas R, Delcroix T, eds. Proceedings of Western Pacific International Meeting and Workshop on TOGA-COARE, May 24–30, 1989. Nouméa, New Caledonia: Inst Fr de Rech Sci pour le Deév en Coop, 123–134Google Scholar
- Liu Q Y, Huang R X, Wang D X, et al. 2006. Interplay between the Indonesian throughflow and the South China Sea throughflow. Chinese Science Bulletin, 10: 1007/s11434-006-9050-xGoogle Scholar
- Liu Q Y, Wang D X, Xie Q, et al. 2007. Decadal variability of Indonesian throughflow and South China Sea throughflow and its mechanism. Journal of Ropical Oceanography, 26(6): 1–6Google Scholar
- Liu Y, Feng M, Church J, et al. 2005. Effect of salinity on estimating geostrophic transport of the Indonesian throughflow along the IX1 XBT section. Journal of Oceanography Volume, 10:1007/s10872-005-0086-3Google Scholar
- Masumoto Y, Sasaki H, Kagimoto T, et al. 2004. A fifty-year eddy-resolving simulation of the world ocean: Preliminary outcomes of OFES (OGCM for the earth simulator). J Earth Simulator, 1: 35–56Google Scholar
- McCreary J P, Lu P. 1994. On the interaction between the subtropical and equatorial ocean circulation: the Subtropical Cell. J Phys Oceamogr, 24: 466–497Google Scholar
- Nitani H. 1972. Beginning of the Kuroshio. In: Stommel H, ed. Kuroshio: Its Physical Aspects. Tokyo: University of Tokyo Press, 129–163Google Scholar
- Sasaki H, Nonaka M, Masumoto Y, et al. 2007. An eddy-resolving hind-cast simulation of the quasi-global ocean from 1950 to 2003 on the earth simulator. In: Hamilton K, ed. High Resolution Numerical Modelling of the Atmosphere and Ocean. New York: Springer Publishers, 157–185Google Scholar
- Wang D X, Liu Q Y, Liu Y, et al. 2004. Connection between interannual variability of the western Pacific and eastern Indian Oceans in the 1997–1998 El Niño event. Progress in Natural Science, 10:1080/10020070412331343721Google Scholar
- Wang F, Hu D, Bai H. 1998. Western boundary undercurrents east of the Philippines. In: He M X, Chen G, eds. Proceedings of PORSEC’ 98—Qingdao, 28–31 July 1998. Qingdao: Ocean Remote Sens Inst, Ocean Univ of Qingdao, 551–556Google Scholar
- Wang Q Y, Zhang X D. 2009. Simulation of undercurrents in western tropical Pacific: II. Velocity structure, transport and the seasonal variations. Marine Forecasts, 26(3): 22–28Google Scholar