Longwave Radiative Effects beyond the Initial Intensification Phase of Tropical Cyclones

Dai, Yi, Torn, Margaret S., Williams, Ian N. and Collins, William D. ORCID: https://orcid.org/0000-0002-4463-9848 (2023) Longwave Radiative Effects beyond the Initial Intensification Phase of Tropical Cyclones. Journal of the Atmospheric Sciences, 80 (7). pp. 1829-1845. ISSN 0022-4928

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Abstract

The effects of longwave radiation on tropical cyclone intensification, with an emphasis on the mature stage, are explored in an idealized modeling framework. Results show that although the cloud-radiative effect aids in early intensification of the vortex, it does not promote increase in the maximum tangential wind (Vmax) and could even reduce Vmax at the mature stage. At later stages, maximum radiative heating is located outside the eyewall and promotes convection there, and the secondary circulation encourages convergence of absolute angular momentum outside the eyewall instead of near the eyewall region, based on a budget analysis. Clear-sky radiative cooling helps invigorate domainwide convection, also limiting the Vmax increase at later stages. The area-averaged frozen moist static energy (FMSE) variance increases even though Vmax decreases. In this sense, the FMSE variance is similar to the monotonically growing integrated kinetic energy, and is more indicative of the system-scale strength than of Vmax. Sensitivity experiments are performed with random initial perturbations and varied initial soundings. An axisymmetric model with a 10-member ensemble not only confirms the results from three-dimensional simulations, but also demonstrates that the weak radiative heating outside the eyewall is indeed able to slow down Vmax within 1 day.

Item Type:	Article
Additional Information:	Data availability statement. The model output is accessible from https://portal.nersc.gov/project/m2574/Dai_TC.
Uncontrolled Keywords:	cloud resolving models,mesoscale models,tropical cyclones,atmospheric science,sdg 3 - good health and well-being ,/dk/atira/pure/subjectarea/asjc/1900/1902
Faculty \ School:	Faculty of Science > School of Environmental Sciences
Related URLs:	https://www.scopus.com/pages/publication...
Depositing User:	LivePure Connector
Date Deposited:	14 Jul 2026 10:22
Last Modified:	19 Jul 2026 05:37
URI:	https://ueaeprints.uea.ac.uk/id/eprint/103840
DOI:	10.1175/JAS-D-22-0214.1

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