Abstract
Abstract. The paper uses experimental data of pressure variations on the Earth's surface during the passage of an atmospheric front recorded by a network of four microbarographs in the Moscow region. Applying these experimental data, empirical approximations of atmospheric pressure field oscillations are suggested. The obtained approximating surface pressure functions are used as the lower boundary condition for simulating the vertical propagation of acoustic-gravity waves from a source in the lower troposphere. Estimates of the amplitude of temperature disturbances in the upper atmosphere caused by acoustic-gravity waves from a propagating atmospheric front are obtained. For the amplitude of wave temperature disturbances, values of about 200 K are obtained. The amplitude of temperature disturbances in the upper atmosphere caused by background pressure fluctuations on the Earth's surface is estimated at 4–5 K.
Highlights
Changes in the parameters of the upper atmosphere and ionosphere are often associated with meteorological phenomena (Blanc et al, 2014), which generate acoustic-gravity waves (AGWs)
When reaching the altitudes of the upper atmosphere and the ionosphere and dissipating, AGWs can change the state of the atmosphere (Pierce and Coroniti, 1966)
AGWs in the lower atmosphere can be generated by atmospheric fronts, jet streams (Ploogonven and Snyder, 2007; Ploogonven and Zhang, 2014) with maximum efficiency at altitudes of 9–12 km (Medvedev and Gavrlov, 1995) and mesoscale turbulence (Fritts and Alexander, 2003; Fritts et al, 2006)
Summary
Changes in the parameters of the upper atmosphere and ionosphere are often associated with meteorological phenomena (Blanc et al, 2014), which generate acoustic-gravity waves (AGWs). Based on numerical simulations it is difficult to estimate the amplitudes of the generated AGWs due to the lack of detailed information on tropospheric sources (Kshevetskii and Kulichkov, 2015). Y. Kurdyaeva et al.: Propagation of acoustic-gravity waves from atmospheric fronts sources is necessary to study these waves. Changes in atmospheric pressure during the formation and evolution of meteorological processes are recorded by microbarographs These registered forms of wave variations in atmospheric pressure can be used to develop models of acoustic-gravity wave sources. The problem of acoustic-gravity wave propagation from variations in density and temperature on the Earth’s surface was studied mathematically in Kurdyaeva et al (2018). The numerical model was used in Kshevetskii (2001a), Kshevetskii (2001b), Kshevetskii (2001c), and Kshevetskii (2002)
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