Use of the VAD technique and measurements of momentum flux in the stratosphere at Aercibo, part 4.3A

Details Use of the VAD technique and measurements of momentum flux in the stratosphere at Aercibo, part 4.3A Use of the VAD technique and measurements of momentum flux in the stratosphere at Aercibo, part 4.3A

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984maph...14..208c&link_type=abstract

In International Council of Scientific Unions Middle Atmosphere Program: Handbook for MAP. Vol. 14 p 208-210 (SEE N85-32466 21

Physics

Flux (Rate), Gravity Waves, Measurement, Radar Measurement, Radial Velocity, Wind Velocity, Azimuth, Momentum, Stratosphere, Troposphere

Scientific paper

The Arecibo 430-MHz radar was used in the velocity-azimuth display (VAD) mode to obtain radial velocity measurements at 16 azimuth directions from which the three-dimensional wind field and momentum flux can be calculated. The radar was operated on a nearly continuous basis for a seven-day period in May of 1982 and the elapsed time between start and finish of a VAD scan was approximately 35 minutes. Radial velocities were measured in the upper troposphere and lower stratosphere (6-24 km) with at height resolution of 150 meters at a zenith angle of 15 deg. Vertical and horizontal velocities are calculated from the sums and differences, respectively, of radial velocity pairs, i.e., at azimuth directions AZ and AZ + 180 degrees. Momentum flux at a particular azimuth is calculated by taking the difference between the square of radial velocities at AZ and AZ + 180 degrees. It should be noted that measurements of radial velocity pairs are not simultaneous but are time delayed by approximately 15-25 minutes. This period, the time required to rotate the antenna feed and take measurements at AZ and AZ + 180 deg, effectively limits sampling of velocities and momentum fluxes to longer period gravity waves and planetary waves.

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