Tropical cyclone diurnal cycle signals in a hurricane nature run

Jason P. Dunion, Christopher D. Thorncroft, David S. Nolan

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

The diurnal cycle of tropical convection and tropical cyclones (TCs) has been previously described in observational-, satellite-, and modeling-based studies. The main objective of this work is to expand on these earlier studies by identifying signals of the TC diurnal cycle (TCDC) in a hurricane nature run, characterize their evolution in time and space, and better understand the processes that cause them. Based on previous studies that identified optimal conditions for the TCDC, a select period of the hurricane nature run is examined when the simulated storm was intense, in a low shear environment, and sufficiently far from land. When analyses are constrained by these conditions, marked radially propagating diurnal signals in radiation, thermodynamics, winds, and precipitation that affect a deep layer of the troposphere become evident in the model. These propagating diurnal signals, or TC diurnal pulses, are a distinguishing characteristic of the TCDC and manifest as a surge in upper-level outflow with underlying radially propagating tropical squallline- like features. The results of this work support previous studies that examined the TCDC using satellite data and have implications for numerical modeling of TCs and furthering our understanding of how the TCDC forms, evolves, and possibly impacts TC structure and intensity.

Original languageEnglish (US)
Pages (from-to)363-388
Number of pages26
JournalMonthly Weather Review
Volume147
Issue number1
DOIs
StatePublished - Jan 1 2019

Keywords

  • Diagnostics
  • Diurnal effects
  • Mesoscale models
  • Model output statistics
  • Tropical cyclones

ASJC Scopus subject areas

  • Atmospheric Science

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