Mechanism of interdecadal variation of sea surface salinity maximum in the South Pacific Ocean
This article utilizes salinity data from 1999 to 2022 to depict the northeast-southwest oscillation in the position of the maximum salinity,with a shift to the northeast in 2005 and 2016,and a shift to the southwest in 2011 and 2022.Two methods,salinity budget analysis and a 1.5-layer reduced gravity model,are used to investigate the interdecadal variation mechanism of the sea surface salinity maximum in the South Pacific Ocean from 1999 to 2022,and to assess the relative contributions of freshwater forcing,horizontal advection,vertical entrainment,and horizontal diffusion.The results show that the average contribution of horizontal advection and freshwater forcing are dominant,with horizontal advection being the key factor driving the interdecadal variation in the position of the sea surface salinity maximum in the South Pacific Ocean,while the freshwater forcing mainly causes changes in the magnitude of salinity values.The contributions of vertical entrainment and horizontal diffusion to the interdecadal variation in the salinity maximum may be relatively small.
South Pacific Oceansea surface salinityinterdecadal variationhorizontal advectionfreshwater forcing
万方数据
维普
