Abstract
The water exchange between the subpolar and subtropical gyres of the North Pacific is demonstrated by the simulation of chlorofluorocarbon (CFC) using an ocean general circulation model. The simulated CFC concentration in the North Pacific is in good agreement with observations. The water exchange is clearly illustrated by the tongues of CFC concentration. The subpolar waters with high CFC are transported southward into the eastern subtropical gyre, whereas the subtropical waters with low CFC are transported northward into the western subpolar gyre. The simulated exchange transport along 42degreesN in the layer of sigma(theta)< 26.8 indicates that the northward mass transport is about 15 Sv (1 Sv = 10(6) m(3) . s(-1)) west of 165DE, and about 5 Sv between 175DW and 150DW The southward mass transport is about 5 Sv between 165DE and 175DW, and about 2 Sv east of 150DW.
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