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Open AccessArticle

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

1
College of Meteorology and Oceanography, National University of Defense Technology, Nanjing 211101, China
2
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; https://doi.org/10.3390/atmos10070405
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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