Radio acoustic measurement of temperature profile in the troposphere and stratosphere

摘要: The radio acoustic sounding system (RASS) uses radar to measure the temperature profile in atmosphere. In standard technique of atmospheric radar, backscatter results from electrical permittivity variations due natural phenomena such as turbulence and precipitation. RASS technique, periodical density/temperature imposed on atmosphere by an wave artificially generated a way that wavelength is half (electromagnetic) wavelength. This ‘Bragg condition’ necessary for efficient backscattering. echo affected Doppler frequency shift arising both speed at which longitudinal perturbations propagate (the sound speed), radial bulk velocity common volume atmosphere—the latter can be measured scatter. observed reduced give local temperature. Here we report experiment using RASS, carried out 1–3 August 1985, consisted high-power, very-high-frequency (VHF) Shigaraki, Shiga, Japan movable high-power transmitter, gave first experimental proof possibility profiling troposphere stratosphere up altitude ∼20 km.