1178 / 2019-08-05 15:22:08

On the Tidal Currents Observed by Moorings in Prydz Bay, East Antarctica

15、冰冻圈科学 > 专题6：海-冰-气相互作用的物理过程和机制

We report on mooring observations of tidal currents in Prydz Bay, East Antarctica. Tides in Prydz Bay are mixed diurnal-semidiurnal and much weaker than that in the Ross Sea and the Weddell Sea, with the averaged value of 2.58 cm s-1 over the continental shelf. The major axes of the tidal ellipses are generally aligned south-north, probably steered by the topography and modulated by the baroclinic tidal components. The averaged tidal kinetic energy can account about 13% with respect to the total kinetic energy at the Amery Ice Shelf calving front during the observing period. We also report on borehole observations of tide-like pulsing of potential temperature and salinity, indicating the indispensable tidal influences in the ice-ocean boundary layer. These mooring and borehole data support that the tidal processes should be highlighted in the investigations of the interaction between the Amery Ice Shelf and ocean.