Ship-based measurements of cloud microphysics and PBL properties in precipitating trade cumulus clouds during RICO Allen White and Jeff Hare, University.

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Presentation transcript:

Ship-based measurements of cloud microphysics and PBL properties in precipitating trade cumulus clouds during RICO Allen White and Jeff Hare, University of Colorado/CIRES Bruce Albrecht and Pavlos Kolias, University of Miami C. W. Fairall, R. J. Hill, and Graham Feingold, NOAA ETL S. Yuter, R. Wood, and C. Bretherton, University of Washington Ship-based, multi-sensor study of dynamics of trade-wind cumuli and the onset of precipitation. UNOLS ship Seward Johnson (202 ft) Cloud – precipitation microphysics PBL structure Surface fluxes (turbulent, radiative) Cloud – precipitation spatial structure Aerosol, clear-air motions

Background More than 20 cruises since Direct fluxes 1992 Ceilometer and wind profiler 1995 Lidar (4 cruises) 1998CO2 fluxes (4 cruises) 1999 Cloud radar (6 cruises)

R/V Seward Johnson Hobart Marine Ft Pierce, FL

Principal Remote Sensors

Air-Sea Fluxes and Mean PBL Structure Stress, Sensible & Latent heat, CO2 –Direct motion-corrected covariances –Intertial-Dissipation –Bulk Radiative Fluxes Stabilized Doppler 915 MHz wind profiler Rawinsondes (UW) Near-surface Bulk Meteorology –SST, Tair, Humidity, wind speed –State-of-art accuracies Ocean Surface Waves –Significant height, period Near-Surface Aerosols –ETL PMS Lasair-II –Other? Precipitation –STI optical raingauge –DMT CIP drizzle spectrometer

Mean Doppler velocity (Left) mapping of a fair weather cumulus cloud and Doppler spectrum width (Right) mapping of a fair weather cumuli. The black contour corresponds to the +1 ms-1 vertical velocity contour. The large values of spectrum width near the top of the updraft core appear to be associated with large horizontal shear of the vertical air velocity. The large values within the updraft core are indicative of large drops within the updraft core.

Lidar Cross-Sections Vertical velocity and corresponding intensity measurements. Maximum range is 1.5 km and time range is 10 minutes. The strong lidar echoes correspond to trade-wind cumuli cloud bases. Coherent updraft structures coincident with strong aerosol backscatter are observed below the cloud bases

Heat fluxes from one day on Stratus03.

Cloud boundaries and drizzle from Stratus03. Cloud top (black – MMCR); Cloud bottom (green dots – ceilo, blue circles – sonde LCL); range gates with drizzle (red dots – MMCR)

30 km 500m o NOAA/K meso-scale swath NOAA/K “cloud entity” swath UM (W/X) NOAA 915-MHz Statistical Properties of precipitating trade wind cumuli from cloud scale to mesoscale

Field Program Time Table Dec 5 days to load Dec 30Depart Ft. Pierce FL Jan 4Arrive Barbuda Jan 25 Depart Barbuda Jan 29Arrive Ft Pierce FL Jan 30-31Destage Preparation Tasks NOAA – KHarden for Marine work, stabilize Miami – W/XInstall in ETL seatainer; stabilize Visit the ship and design container layout, etc Arrange installation issues with ship Ship equipment and install