Vertical Motion Structure in Maritime continent mesoscale Convective Systems: Results from a 50-MHz Profiler

Abstract

Abstract Wind profiler data wore used to determine the vertical motion structure in four tropical mcsoscale convective systems (MCSs), which occurred during the Down Under Doppler and Electricity Experiment (DUNDEE) near Darwin. Northern Territory, Australia. Three of the MCSs occurred during the monsoon-break convective regime and one occurred during the monsoon regime. In the break regime cases (each with a leading convective and trailing stratiform region structure), the wind profiler sampled low-level convective cells on the leading edge of the convective region, trailed by deeper updrafts of comparable magnitude. Surface rainfall measurements from a network of raingauges showed two comparable peaks in rainfall intensity that roughly corresponded to the passage of low-level and deep convective updraft (71%–80% of the system total rainfall was associated with the passage of the convective line). In the stratiform region, the profiler data showed generally weak vertical drafts (<1 m s−1) and the presenc...