Hydrometeors Injected into the Large-scale Environment by Tropical Cloud Systems Robert A. Houze & Courtney Schumacher Co-PIs ARM Science Team Meeting,

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Presentation transcript:

Hydrometeors Injected into the Large-scale Environment by Tropical Cloud Systems Robert A. Houze & Courtney Schumacher Co-PIs ARM Science Team Meeting, Albuquerque, New Mexico, 27 March 2006

Tropical MCSs inject lots of hydrometeors into upper troposphere Idealized life cycle of tropical MCS as proposed by Houze 1982

Think of the following schematic as a composite of the water budget of an MCS over its whole life cycle After Houze et al. (1980)

Stratiform water budget equation

Cloud radar  E se Precip radar  R s Doppler  E sd, C su, C T Measurements

In TWP-ICE we are subdividing the anvil into mixed and ice anvils

13˚ S 11˚ S 12˚ S 130˚E132˚E131˚E dB Z 20 January UTC 6 km 13˚ S 11˚ S 12˚ S 130˚E132˚E 131˚E dB Z 20 January UTC 6 km 13˚ S 11˚ S 12˚ S 130˚E132˚E 131˚E dBZ 20 January UTC 6 km Example from TWP-ICE dBZ Jan Jan Jan Jan Jan Jan Jan Jan Jan Jan Jan Jan ATTENUATED Height (km) Cloud Radar Precipitation Radar

TWP-ICE Precipitation Radar Rain Rate (~20 % stratiform) TWP-ICE Cloud Radar Anvil Frequency Longer-term records of the water budget parameters also are being derived. Figures here are for duration of TWP-ICE. This will also be done for a longer-term climatology. We will use cloud & precipitation radars permanently located at Darwin.

Using the empirically derived water budget parameters b and  s, the stratiform regions’ anvil mass is proportional to the stratiform rain E se =(bR s )/  s 200 hPa streamfunction response to CRF assumed proportional to TRMM rain by Schumacher et al. (2004) 400 hPa K/day

Summary Water budget relationships will be used to investigate the magnitude & mechanisms of anvil generation by convective systems Cloud & Precipitation Radar will be used to estimate terms in the water budgets, & water budget terms will be checked for internal consistency The TWP-ICE dataset is being used to estimate the water budget terms for some representative cases, & for long-term dataset at Darwin Will develop formulas for parameterizing the anvil mass in terms of satellite observed rainfall.

Thank you!