, Volume 32, Issue 7, pp 14-20
Date: 13 Jul 2013

Climatology and seasonal variability of the Mindanao Undercurrent based on OFES data

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Abstract

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, σ θ =26.5 and σ θ =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.

Foundation item: The Major Project of the National Natural Science Foundation of China under contract No. 40890152; the National Basic Research Program of China under contract No. 2012CB417404; National Natural Science Foundation of China under contract Nos 41221063 and 41130859.