Mechanism of interannual variability of ocean bottom pressure in the South Pacific

The study of ocean bottom pressure (OBP) is useful for understanding the variability that contributes to sea level change. Previous studies have reported strong OBP anomalies in Southern Ocean on different timescales. In this study, characteristic and mechanisms energetic interannual southeastern Pacific are examined using 14 years Gravity Recovery Climate Experiment (GRACE) data. It found positive (negative) related convergence (divergence) Ekman transport forced by local winds variability. Such attributed atmospheric teleconnections, particularly second Pacific-South American (PSA2). (SLP) associated with phase PSA2 shows a wavenumber-3 structure high latitude South Pacific, which benefits persistent anticyclone over leading there. Moreover, El Niño–Southern Oscillation (ENSO) plays an important role concurrent during austral spring (August–November) leads autumn (March–June) 1 season. These results highlight influence teleconnections validated mass conservation (non-Boussinesq) model, expected not only better longer time, but also predict variation global scale.