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Title: Source tracing of thunderstorm generated inertia-gravity waves observed during the RADAGAST campaign in Niamey, Niger
Authors: Athreyas, Kashyapa Naren
Gunawan, Erry
Tay, Bee Kiat
Keywords: Thunderstorms
DRNTU::Engineering::Electrical and electronic engineering
Inertia Gravity Waves
Issue Date: 2018
Source: Athreyas, K. N., Gunawan, E., & Tay, B. K. (2018). Source tracing of thunderstorm generated inertia-gravity waves observed during the RADAGAST campaign in Niamey, Niger. Journal of Atmospheric and Solar-Terrestrial Physics, 172, 1-9. doi:10.1016/j.jastp.2018.03.003
Series/Report no.: Journal of Atmospheric and Solar-Terrestrial Physics
Abstract: In recent years, the climate changes and weather have become a major concern which affects the daily life of a human being. Modelling and prediction of the complex atmospheric processes needs extensive theoretical studies and observational analyses to improve the accuracy of the prediction. The RADAGAST campaign was conducted by ARM climate research stationed at Niamey, Niger from January 2006 to January 2007, which was aimed to improve the west African climate studies have provided valuable data for research. In this paper, the characteristics and sources of inertia-gravity waves observed over Niamey during the campaign are investigated. The investigation focuses on highlighting the waves which are generated by thunderstorms which dominate the tropical region. The stratospheric energy densities spectrum is analysed for deriving the wave properties. The waves with Eulerian period from 20 to 50 h occupied most of the spectral power. It was found that the waves observed over Niamey had a dominant eastward propagation with horizontal wavelengths ranging from 350 to 1 400 km, and vertical wavelengths ranging from 0.9 to 3.6 km. GROGRAT model with ERA-Interim model data was used for establishing the background atmosphere to identify the source location of the waves. The waves generated by thunderstorms had propagation distances varying from 200 to 5 000 km and propagation duration from 2 to 4 days. The horizontal phase speeds varied from 2 to 20 m/s with wavelengths varying from 100 to 1 100 km, vertical phase speeds from 0.02 to 0.2 m/s and wavelengths from 2 to 15 km at the source point. The majority of sources were located in South Atlantic ocean and waves propagating towards northeast direction. This study demonstrated the complex large scale coupling in the atmosphere.
ISSN: 1364-6826
DOI: 10.1016/j.jastp.2018.03.003
Rights: © 2018 Elsevier Ltd. All rights reserved. This paper was published in Journal of Atmospheric and Solar-Terrestrial Physics and is made available with permission of Elsevier Ltd.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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