Physics
Scientific paper
Dec 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985rasc...20.1509n&link_type=abstract
Radio Science (ISSN 0048-6604), vol. 20, Nov.-Dec. 1985, p. 1509-1517. USAF-supported research.
Physics
1
Backscattering, Clear Air Turbulence, Diurnal Variations, Doppler Radar, Statistical Analysis, Very High Frequencies, Gravity Waves, Planetary Boundary Layer, Stratosphere
Scientific paper
Results from a statistical analysis of backscattered signal power measurements at 4-18 km by the clear-air Doppler radars (MST radars, or wind profilers) in the Colorado Profiler Network and at Poker Flat, Alaska, show a systematic diurnal variation during the summer months. These diurnal variations have a high level of statistical significance. In the midtroposphere the diurnal range is near 7 dB with largest values in the afternoon, probably associated with the enhanced turbulence and moisture levels due to afternoon convection. In the stratosphere the diurnal range is about 5 dB over Colorado, with smallest values in the afternoon. The stratospheric cycle is interpreted as a response to modulation of the amplitude of gravity waves propagating upward from the troposphere. The diurnal cycle at all heights becomes indistinct during the winter months.
Ecklund Warner L.
Gage Kenneth S.
Nastrom Gregory Dale
Strauch R. G.
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