On the correlation between total condensate and moist heating in tropical cyclones and applications for diagnosing intensity

David S. Nolan, Yoshiaki Miyamoto, Shun Nan Wu, Brian J. Soden

Research output: Contribution to journalReview article

Abstract

While the transfer of moist enthalpy from the ocean to the atmosphere is the fundamental energy source for tropical cyclones, the release of latent heat in moist convection is the mechanism by which this energy is converted into the kinetic and potential energy of these storms. Most observational estimates of this heat release rely on satellite estimates of rain rate. Here, examination of five high-resolution numerical simulations of tropical cyclones reveals that there is a close correlation between the total condensate and the total heating, even though the former quantity is an amount and the latter is a rate. This relationship is due to the fact that for condensate to be sustained at large values, it must be rapidly replaced by new condensate and associated latent heating. Total condensate and total rain rate within fixed radial distances such as 111 km also show good correlations with the current intensity of the storm, but surprisingly, high values of condensate at high altitudes and close to the storm center are not good predictors of imminent intensification. These relationships are confirmed with an additional ensemble of 270 idealized simulations of tropical cyclones with varying sizes and intensities. Finally, simulated measurements of total condensate are computed from narrow swaths modeled after the cloud profiling radar on the CloudSat satellite. Despite their narrow footprint and the fact that they rarely cut through the exact center of the cyclone, these estimates of total condensate also show a useful correlation with current intensity.

Original languageEnglish (US)
Pages (from-to)3759-3784
Number of pages26
JournalMonthly Weather Review
Volume147
Issue number10
DOIs
StatePublished - Jan 1 2019

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condensate
tropical cyclone
heating
CloudSat
potential energy
enthalpy
footprint
cyclone
kinetic energy
simulation
convection
radar
atmosphere
ocean
energy
rate

ASJC Scopus subject areas

  • Atmospheric Science

Cite this

On the correlation between total condensate and moist heating in tropical cyclones and applications for diagnosing intensity. / Nolan, David S.; Miyamoto, Yoshiaki; Wu, Shun Nan; Soden, Brian J.

In: Monthly Weather Review, Vol. 147, No. 10, 01.01.2019, p. 3759-3784.

Research output: Contribution to journalReview article

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