Convective bursts with gravity waves in tropical cyclones: Case study with the Himawari‐8 satellite and idealized numerical study
Abstract
Convective bursts occur frequently in tropical cyclones and help their intensification by diabatic heating, but their quantitative importance has not been established. By using the high‐frequency observation of infrared brightness temperature with Himawari‐8, a latest‐generation geostationary meteorological satellite, convective bursts in Typhoon Lan (2017) were studied. Aided with a series of numerical simulations, it was revealed that the anvil edges of many bursts are associated with finite‐amplitude gravity waves consistent with internal bores, creating warm anomalies by subsidence ahead of the edges. As the edges spread, they are thinned, and their propagation speeds are often decreased. In many such instances, gravity waves, now linear, are separated from the edges to propagate away, spreading convective heating. It is proposed that by quantifying these processes with geostationary satellites, diabatic heating by convective bursts can be estimated to diagnose their impacts on tropical‐cyclone intensification.
Citation
Horinouchi, T., U. Shimada, and A. Wada, 2020: Convective bursts with gravity waves in tropical cyclones: Case study with the Himawari‐8 satellite and idealized numerical study. Geophysical Research Letters, 47, e2019GL086295. https://doi.org/10.1029/2019GL086295.
Public Software
The source codes of a simple 2D spectral Anelastic/Boussineq model used in this paper are available at:
https://github.com/thorinouchi/anelastic_boussinesq_2D
LICENSE
The software complies with GNU General Public License v3.0Explanation Video
This is the presentation video by Takeshi Horinouchi for the 34th Conference on Hurricanes and Tropical Meteorology of American Meteorological Society.