[AAS02-P03] Dynamical mechanisms of anomalous moisture transport towards East Antarctica
Keywords:moisture transport, East-Antactica, evaporation-precipitation linkages
We use both Eulerian and Lagrangian analysis to demonstrate that moisture transport was facilitated by several cyclones of different scales. Moisture transport towards East-Antarctica occurred in coherent air-streams, manifested initially as intense low-level jets embedded in the warm sector of the cyclone(s), followed by a transition to slantwise (pseudo-isentropic) ascent before reaching the continent. Water vapor loading of this moist-conveyor-belt was driven by low-level convergence in the warm sector along the advancing cold-front, whereas the slantwise ascent phase of the moisture transport was characterized by moisture removal (precipitation). Oceanic evaporation along the filamentary structured, anomalous moisture transport area was virtually absent, indicative for long-range moisture transport during the event. In addition to the moisture transport mechanisms we identified moisture source regions associated with the event.