Low-frequency sea level variability in the southern Indian Ocean and its impacts on the oceanic meridional transports

摘要: Sea levels in the southern Indian Ocean (SIO) display significant interannual to decadal variability. Off northwest Australian coast, it has been demonstrated that sea level variability is mostly modulated by remote wind forcing from tropical Pacific through equatorial and coastal waveguides. In this study, a linear reduced gravity model used investigate relative contributions of local SIO, with focus on western SIO. North South Equatorial Current bifurcation latitude (17 degrees S), simulated are well correlated altimeter observations at dissipation timescale about 3 years, suggesting interannual-to-decadal timescales could be explained nondispersive baroclinic Rossby wave adjustment. The large SIO primarily caused westward-propagating waves driven stress curl 70 E-95 E, minor influence forcing. To south, around 20 S displays lower amplitude due weaker variations band, modeled than observations. There close linkage between cross-basin difference 15 interior meridional ocean transport across timescales, as assessed outputs data-assimilation model. Thus, overturning cell influenced both winds