Ship-Based Measurements of Cloud Microphysics and PBL Properties in Precipitating Trade Cumuli During RICO
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2 Ship-Based Measurements of Cloud Microphysics and PBL Properties in Precipitating Trade Cumuli During RICO Institutions: University of Miami; University of Colorado; NOAA ETL Investigators: P. Kollias (UM); J. Hare and A. White (CU); C. Fairall, G. Feingold, and R. Hill (ETL)
3 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
4 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
5 Ship-Board Instrumentation
6 R/V Seward Johnson General Specifications Length Overall feet. Length between Perpendiculars 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 /1994.
7 R/V Seward Johnson
8
9 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
10 Statistical Properties of precipitating trade wind cumuli from cloud scale to mesoscale UM (W/X) o NOAA/K cloud entity swath NOAA 915-MHz 500m NOAA/K meso-scale swath 30 km
11 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 islandbased 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
12 Scientific Questions to be Addressed 5. Can we find evidence for cloud processing of aerosol in the aerosol size distributions? 6. Can we detect changes in cloud microphysics under different aerosol loadings?
13 UM Cloud and Precipitation Mobile Observatory UM W-band Doppler radar Frequency: 94.2 GHz (wavelength = 3.19 mm) Antenna: 0.91 m, Cassengrain 0.24o beamwidth (8-10 m at 1 km range) Vertical resolution: 30 m, Temporal Resolution: sec PRF: 5-10 khz (4-8 ms-1) Nyquist Doppler spectra, raw I/Q Sensitivity: km UM X-band Doppler radar Frequency: 9.4 GHz (wavelength = 3.2 cm) Antenna: 2 m, Cassengrain Vertical resolution: 60 m, Temporal Resolution: sec PRF: khz (8-20 ms-1) Nyquist Doppler spectra, raw I/Q Sensitivity: km Ceilometer Broadband radiometers IRT Surface Met. Rain gauge ** NOAA/ETL 2 channel Microwave Radiometer
14 Scientific Questions to Be Addressed 1. What is the range of the dynamical and microphysical structures in trade-wind cumuli, and how do these structures affect the lifecycle of clouds under varying wind shear, stability, and aerosol conditions? 2. What microphysical / dynamical factors and time scales are involved in the production of largedrop concentrations in fair-weather cumulus clouds? 3. How do the raindrop size distributions evolve from the initial to mature precipitating stages of shallow cumuli?
15 Scientific Questions to be Addressed 4. How is the marine boundary layer altered by precipitation from trade-wind cumuli? 5. What are the statistical properties of precipitating trade-wind cumuli from the cloud to mesoscale scale?
16 Approaches Coordination with Surface-Based Radars and Aircraft and Integration of Observations Continuous Monitoring for Cloud Statistics
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