Institutions: University of Miami; University of Colorado; NOAA ETL

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Presentation transcript:

Institutions: University of Miami; University of Colorado; NOAA ETL Ship-Based Measurements of Cloud Microphysics and PBL Properties in Precipitating Trade Cumuli During RICO Institutions: University of Miami; University of Colorado; NOAA ETL If the clouds grow to higher height the droplets, under the right condiitons can continue to grow until they become large enoguh that they can fall fomr the cloud in the form of rain. Over water it is much easier for rain to form, since the cloud nuclei on which clouds form are often salt particles, which have an infinity for water. Investigators: P. Kollias (UM); J. Hare and A. White (CU); C. Fairall, G. Feingold, and R. Hill (ETL)

Ship-Based Radars 915-MHz wind profiler--PBL 3-D winds, inversion height, cloud and precipitation structure 9.4 GHz Doppler Radar (upward pointing)—Reference reflectivity; Doppler spectra ; Cloud dynamics and precipitation physics 35 GHz Scanning Doppler cloud radar—Reflectivity and Doppler moments; Cloud mapping and microphysical properties; precipitation mapping 94-GHz Doppler radar (stabilized/scanning)--High resolution Doppler spectra; cloud and precipitation microphysics

Scanning Doppler Lidar (NOAA ETL) Range resolved radial wind speed and intensity measurement once a second Resolution/Range: ~20 cm s-1 ; 5 km Scanning: Motion compensated hemispheric scanner Measurements: Aerosol distributions and wind motions around and below clouds

Ship-Board Instrumentation

R/V Seward Johnson General Specifications Length Overall - 204 feet. Length between Perpendiculars - 183 feet. Beam Overall - 36 feet. Fuel Capacity - 60,000 Gal. Fuel Consumption - 70 gal./hr., normal cruise. Potable Water - 15,000 gal. with RO Unit (120 gal. hr.). Accommodations - 40 (including crew). Speed - 13 knots. Year Built/Converted - 1984/1994.

R/V Seward Johnson

Ship Operations Remote Sensing and In Situ -- Continuous Rawindsondes – 6/day Coordination with Island-ased Radars—Approx 20 km off shore (daily (?) repositioning) Scanning for Ka-Band Radar and Doppler Lidar

Statistical Properties of precipitating trade wind cumuli from cloud scale to mesoscale UM (W/X) NOAA/K “cloud entity” swath 10-15o NOAA 915-MHz 500m NOAA/K meso-scale swath 30 km

Coordination with Other RICO Operations Operations Center Needs: Ship info for mission planning; Ship positioning and operations Mode: Internent; Telephone; Radio (?) Schedule: Before and after planning meetings; regular 6 per day soundings; on-demand Surface-Based Radars Needs: Positioning of ship; Ship operations; Met Input for island-based radar operations Mode: Radio, Internet, Telephone Schedule: On demand; scheduled times) Aircraft Needs: Ship operations and positioning; Observational input for in-flight operations Mode: Radio Schedule: On demand