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On the Spectra of Gravity Waves Generated by Two Typical Convective Systems

College of Meteorology and Oceanography, National University of Defense Technology, Nanjing 211101, China
Meteorology and Space Weather Monitoring and Warning Center, China Xi’an Satellite Control Center, Xi’an 710000, China
Authors to whom correspondence should be addressed.
Atmosphere 2019, 10(7), 405;
Received: 16 June 2019 / Revised: 11 July 2019 / Accepted: 14 July 2019 / Published: 17 July 2019
(This article belongs to the Section Climatology and Meteorology)
Spectral characteristics of lower-stratospheric gravity waves generated in idealized mei-yu front and tropical cyclone (TC) are compared by performing high-resolution simulations. The results suggest that the systems which organize convection in different forms can generate waves with distinctly different presentation. The mei-yu front appears as a linear zonal wave source and gravity waves are dominated by cross-frontal (meridional) propagating components. The northward (southward) components have dominant meridional wavelengths of 125–333 km (>250 km), periods of 100–200 min (83–143 min), and phase speeds of 0–15 m s−1 (15–20 m s−1). The TC appears as a point wave source and gravity waves propagate equally in various horizontal directions. The waves exhibit greater power and broader spectral distributions compared with those in the mei-yu front, with dominant horizontal wavelengths longer than 62.5 km, periods of 33–600 min, and phase speeds slower than ~40 m s−1. View Full-Text
Keywords: gravity waves; convective systems; spectral analysis gravity waves; convective systems; spectral analysis
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Wang, Y.; Zhang, L.; Peng, J.; Zhang, Y.; Wei, T. On the Spectra of Gravity Waves Generated by Two Typical Convective Systems. Atmosphere 2019, 10, 405.

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