Probing the Analytical Cancelation Factor of Short Scale Gravity Waves Using Na Lidar and Nightglow Data from the Andes Lidar Observatory
Autor: | Pedro Vega, Fabio Vargas, Javier Fuentes, Luis Navarro, Gary R. Swenson |
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Jazyk: | angličtina |
Rok vydání: | 2020 |
Předmět: |
Atmospheric Science
010504 meteorology & atmospheric sciences Atmospheric gravity waves all-sky imagery Environmental Science (miscellaneous) lcsh:QC851-999 01 natural sciences cancellation factor Observatory 0103 physical sciences Gravity wave Emission spectrum airglow 010303 astronomy & astrophysics Zenith lidar 0105 earth and related environmental sciences Physics Gravitational wave mesosphere-lower thermosphere Airglow Geodesy Short scale atmospheric_science Computational physics Lidar Amplitude atmospheric gravity waves Computer Science::Programming Languages lcsh:Meteorology. Climatology Thermosphere Geology |
Zdroj: | Atmosphere, Vol 11, Iss 1311, p 1311 (2020) Atmosphere Volume 11 Issue 12 |
Popis: | The cancellation factor (CF) is a model for the ratio between gravity wave perturbations in the nightglow intensity to those in the ambient temperature. The CF model allows us to estimate the momentum and energy flux of gravity waves seen in nightglow images, as well as the divergence of these fluxes due to waves propagating through the mesosphere and lower thermosphere region, where the nightglow and the Na layers are located. This study uses a set of wind/temperature Na lidar data and zenith nightglow image observations of the OH and O(1S) emissions to test and validate the CF model from the experimental perspective. The dataset analyzed was obtained during campaigns carried out at the Andes Lidar Observatory (ALO), Chile, in 2015, 2016, and 2017. The modeled CF was compared with observed CF values calculated using the ratio of wave amplitude in nightglow images to that seen in lidar temperatures for vertically propagating waves. We show that, in general, the modeled CF underestimates the observed CF results. However, the O(1S) emission line has better agreement with respect to the modeled value due to its supposedly simpler nightglow photochemistry. In contrast, the observed CF for the OH emission deviates by a factor of two from the modeled CF asymptotic value. |
Databáze: | OpenAIRE |
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