MAPR Multiple Antenna Profiler Radar
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Transcript of MAPR Multiple Antenna Profiler Radar
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MAPRMAPR Multiple Antenna Profiler RadarMultiple Antenna Profiler Radar
Steve Cohn, Dave Parsons (Science)
Eleanor Praskovskaya (Science)
Mike Susedik (Hardware)
Charlie Martin & Gordon Maclean (Software)
William Brown
National Center for Atmospheric Research
Support from DOE’s ARM and VTMX Programsand NCAR / ATD
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DBSDBS
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MAPRMAPR
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MAPR compared with MAPR compared with conventional DBS profilersconventional DBS profilers
Disadvantages• MAPR requires 4 antennas and receivers• Data analysis more sophisticated• Less sensitivity so more powerful transmitter required
Advantages• MAPR can make a much faster wind measurement• MAPR provides continuous measurements• MAPR does not need mechanical phase switches
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MAPR - SpecsMAPR - Specs
Transmitter Peak Power: 500W (soon to be upgraded to 4kW) Duty Cycle: 10 - 15% Receivers: 4 x Radian (soon to be replaced by PIRAQ) Antenna: standard Radian 4 panel, 64 element array (split
in 4 for receiving) Beam Width: 8 deg (HWHM) Resolution: 60, 105, 210 m (depending on SNR) Typical range: 2 - 5 km (clear-air) Typical time resolution: 1 minute (15
sec in high SNR, 10 minutes in low SNR) Data: netCDF (raw & spectra) or consensus wind files Real-time wind analysis produces plots on the Web
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MAPRMAPR
NOAA BAO 300m towerMAPR with clutter screen
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Last NightLast Night
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MAPR wind measurements (MAPR wind measurements () ) Anemometer measurements (Anemometer measurements (lineline) BAO tower (300m)) BAO tower (300m)
Clear-air echoes
Good agreement between MAPR and Anemometer wind measurements
About 80% of measure-ments agree to 2m/s
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Cold FrontCold Front
• MAPR and tower observations
•Note the brief updraft (red) in clear-air ahead of the front
• MAPR can make continuous and rapid 3D wind measurements
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Cold FrontCold Front
Note the strong downdraft, followed by a strong updraft at the leading edge of the front.
The frontal passage at the surface was weak.
The periodic up and down motions, which follow, suggests gravity waves.
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Nauru99Nauru99
MAPR operated for 1 month at sea for DOE/ARM’s Tropical Western Pacific campaign, Nauru99
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Nauru99Nauru99
MAPR Observations of squalls (rain & clear-air)
Note the wind gusts (orange/red wind barbs) and updrafts (yellow/red) in clear-air around squalls
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Turbulence MeasurementTurbulence Measurement
MAPR can estimate turbulent intensity
Doppler spectral width is related to velocity variance measured by a sonic anemometer
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Overall goals for MAPROverall goals for MAPR
Rapid measurement of the 3-D wind Estimates of turbulent intensity Rapid Deployment Detection of three-dimensional winds and heat
flux from applying spaced antenna techniques to radio acoustic sounding system (RASS)
Incorporation of multiple wavelengths and FDI processing to detect and monitor the evolution of fine-scale refractivity layers