Figure 1: The Sverdrup transport at 8°N calculated from the FSU wind from year 1961-1996: (a) Component longer than 1 year, low-pass filtered with the Daubechies 4 wavelet. (b) Component corresponding to 16-months timescale (c). Component corresponding to 32-months timescale. (d) Component low-pass filtered with time scale longer than (c). Dotted lines show the Sverdrup transports by winds used in this study.
In this study, we compare model results forced by steady wind of various curl strength as a first step to understand the effect of variability of Northern Pacific Ocean on the IT. This means that we rather focus on physics related with low frequency variation. We will also show that the model, even forced by steady wind, contains high frequency variation. Thus, this study also throws light on mechanism of high frequency variations.
2. Method
A 1.5 layer reduced gravity model is used to get important physical insight in the surface ocean layer. Formulations are the same as Inoue and Welsh (1993) The model region is 80°E〜120°W in longitude and 50°S - 30°N in latitude. Horizontal resolution is 1/4°in longitude and latitude. The shape of coastline is simplified to highlight the elfect of relatrvely large scale geometly The geometry in the Indonesian Seas is magnified in Fig. 2 (b).
