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MAPR Multiple Antenna Profiler Radar. William Brown National Center for Atmospheric Research. Steve Cohn, Dave Parsons (Science) Eleanor Praskovskaya (Science) Mike Susedik (Hardware) Charlie Martin & Gordon Maclean (Software). Support from DOE’s ARM and VTMX Programs and NCAR / ATD.

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mapr multiple antenna profiler radar

MAPRMultiple Antenna Profiler Radar

William Brown

National Center for Atmospheric Research

Steve Cohn, Dave Parsons (Science)

Eleanor Praskovskaya (Science)

Mike Susedik (Hardware)

Charlie Martin & Gordon Maclean (Software)

Support from DOE’s ARM and VTMX Programs

and NCAR / ATD

mapr compared with conventional dbs profilers
MAPR compared with conventional DBS profilers
  • Advantages
  • MAPR can make a much faster wind measurement
  • MAPR provides continuous measurements
  • MAPR does not need mechanical phase switches
  • Disadvantages
  • MAPR requires 4 antennas and receivers
  • Data analysis more sophisticated
  • Less sensitivity so more powerful transmitter required
mapr specs
MAPR - 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
slide6
MAPR

MAPR with clutter screen

NOAA BAO 300m tower

mapr wind measurements anemometer measurements line bao tower 300m
MAPR wind measurements () Anemometer measurements (line) BAO tower (300m)

Clear-air echoes

Good agreement between MAPR and Anemometer wind measurements

About 80% of measure-ments agree to 2m/s

cold front
Cold 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
cold front1
Cold 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.
nauru99
Nauru99

MAPR operated for 1 month at sea for DOE/ARM’s Tropical Western Pacific campaign, Nauru99

nauru991
Nauru99

MAPR Observations of squalls (rain & clear-air)

Note the wind gusts (orange/red wind barbs) and updrafts (yellow/red) in clear-air around squalls

turbulence measurement
Turbulence Measurement

MAPR can estimate turbulent intensity

Doppler spectral width is related to velocity variance measured by a sonic anemometer

overall goals for mapr
Overall 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