Sensitivity of typhoon-induced gravity waves to cumulus parameterizations

Details Sensitivity of typhoon-induced gravity waves to cumulus parameterizations Sensitivity of typhoon-induced gravity waves to cumulus parameterizations

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3415814k&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 15, CiteID L15814

Physics

3

Atmospheric Processes: Mesoscale Meteorology, Atmospheric Processes: Convective Processes, Atmospheric Processes: Acoustic-Gravity Waves, Atmospheric Processes: Middle Atmosphere Dynamics (0341, 0342), Atmospheric Processes: Clouds And Cloud Feedbacks

Scientific paper

Sensitivity of typhoon-induced gravity waves to cumulus parameterizations is examined using a mesoscale model (MM5). For this, Typhoon Rusa (2002) is simulated with four cumulus parameterizations (Kain-Fritsch, Grell, Anthes-Kuo, and Betts-Miller schemes) and the characteristics of typhoon-induced gravity waves are compared. The experiments show differences in rainband structure and vertical motion, resulting in different forcing spectra for zonal wavelength and period. As a result, induced stratospheric gravity waves are different in amplitude and spectral shape. However, the difference is not as large as that in the forcing spectrum, since a large portion of the waves generated by major forcing components is filtered out by the background wind, which is nearly the same in all the experiments. Instead, variation in zonal wavelength and period of forcing modifies the characteristics of stratospheric gravity waves by changing damping time scale in the nonfiltered region.

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