1. Cirrus Production by a Mesoscale Convective System Sampled During TWP-ICE: Analysis via Water Budget Equations Jasmine Cetrone and Robert Houze University of Washington Introduction This study computes certain elements of the water budget of a MCS observed during the Tropical Warm Pool-International Cloud Experiment (TWP-ICE). The precipitation efficiency can help relate global maps of precipitation to maps of global anvil coverage, and the amount of cirrus produced by the system affects the radiation budget of the MCS. C cu = R c + E cd + A c + C T C T + C su = R s + E sd + A s MCS Overview Condensation and Evaporation Precipitation Results over radar domain: C cu =3.3627×10 13 kg E cd =1.8498×10 13 kg C su =2.7560×10 13 kg E sd =3.8781×10 13 kg Results over radar domain: R c =2.8586×10 12 kg R s =6.7226×10 11 kg R=R c +R s =3.5208×10 12 kg Anvil Ice water content (IWC) calculated for anvil seen by MMCR via a Z-IWC relationship: IWC=0.097Z 0.59 Histogram of ice water path (IWP) calculated for the anvil; applied to the area covered by anvil in the satellite to get the mass of total anvil (A c +A s ) MMCR sensitivity was low during TWP-ICE, resulting in underestimation of IWC in anvil and thus total anvil mass Some anvil will not be accounted for as it evaporates Results of anvil from satellite/MMCR method: A c +A s =3.3244×10 11 kg Convective RainStratiform Rain 126127128129130131132133°E 11°S 12 13 14 60 53 46 39 32 25 18 11 4 dBZ 16 0 4 8 12 20 19 Jan 22:00 20 Jan 00:00 20 Jan 02:00 20 Jan 04:00 20 Jan 06:00 20 Jan 08:00 20 Jan 10:00 Time  Height (km) Millimeter Cloud Radar 28 21 14 7 0 -7 -14 -21 -28 dBZ 151050 Specific Humidity (g kg -1 ) 0 2 4 6 8 10 12 14 16 18 20 Height (km) Distance from radar (km) 150 100 50 0 -50 -100 -150-100-50050100150 Storm Rain Total (mm) 200 0 160 40 0 80 120 Distance from radar (km) 150 100 50 0 -50 -100 -150-100-50050100150 Storm Rain Total (mm) 25 0 20 5 0 10 15 30 Acknowledgements We would like to thank Stacy Brodzik for her invaluable efforts in processing this data. ARM - DOE Grant DE-FG02-06ER64175 NASA ESS Grant NNG05GP07H 00.51.01.52.02.5 0.01 0.02 Frequency 0 IWP (kg m -2 ) Results of anvil as a residual of other terms: A c +A s =C cu +C su -E cd -E sd -R c -R s between 3.077×10 11 kg and 6.154 ×10 11 kg (for areas between 1 and 2 times the radar area coverage) Summary and Future Work Anvil mass is approximately 10% of the total rain precipitated out by the system in the radar domain Errors in MMCR data amplify in calculations of anvil mass Next steps: Extend to another MCS (23-24 Jan) Determine error bars on calculations Extend to other tropical regions Visible Satellite and Radar Reflectivity at 03:30 on 20 January A large MCS moved toward the north over the radar sites on 19-20 January 2006 MCS was mainly leading convective precipitation and trailing stratiform Anvil blown off toward the WNW by upper-level winds Total precipitation area coverage of storm uncertain: between 1 and 2 times the actual radar area coverage Humidity profile computed from Darwin radiosonde Vertical velocity profiles of updrafts and downdrafts in the convective and stratiform regions computed from dual- Doppler radar data Condensation and evaporation terms calculated from the following equations: Convective/stratiform maps computed from radar data Maps applied to reflectivity data to give convective and stratiform rain totals in the radar domain ARM Science Team Meeting, Monterey, CA, 27 March 2007