Wednesday, 24 May 2000: 11:15 AM
Filtered time series analysis of echo areal coverage collected by the TOGA
radar, partitioned into convective and stratiform raining area, is used to
identify distinct monsoon-like and break regimes during the 55-day TRMM
LBA experiment. A time series analysis of electrical field mill data contained
within the area of radar coverage indicates strongly contrasting periods of
active vs. suppressed lightning activity. Preliminary analysis of radiosonde
results at the LBA sounding sites illustrates varying wind regimes in which
mesoscale convective systems (MCS) developed, and these regimes are related
to trends in the rainfall and lightning. Multi-day episodes of low-level
northwesterly flow featured MCS containing a large fraction of stratiform
relative to convective rain, with little lightning activity. In contrast, periods
of northeasterly flow produced MCS with more vigorous convection and
attendant higher occurrence of lighting.
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