The Diurnal Cycle of Precipitation in Tropical Cyclones

Position and intensity data from the International Best Track Archive for Climate Stewardship (IBTrACS) are combined with global, gridded precipitation estimates from the Tropical Rainfall Measuring Mission (TRMM) Multisatellite Precipitation Analysis (TMPA) for the period 1998–2013 to study the diu...

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Bibliographic Details
Published in:Journal of climate 2015-07, Vol.28 (13), p.5325-5334
Main Authors: Bowman, Kenneth P., Fowler, Megan D.
Format: Article
Language:English
Subjects:
Algorithms
Amplitude
Amplitudes
Archives & records
Computer centers
Cyclones
Diurnal cycle
Diurnal variations
Estimates
Hurricane forecasting
Hurricanes
Land
Marine
Meteorology
Microwaves
Ocean basins
Oceanic convection
Oceans
Precipitation
Precipitation estimation
Rain
Rainfall
Satellites
Statistical analysis
Statistical methods
Stewardship
Storms
Stratification
Studies
Tropical climates
Tropical cyclone intensities
Tropical cyclones
Tropical rainfall
Tropical Rainfall Measuring Mission (TRMM)
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Summary:Position and intensity data from the International Best Track Archive for Climate Stewardship (IBTrACS) are combined with global, gridded precipitation estimates from the Tropical Rainfall Measuring Mission (TRMM) Multisatellite Precipitation Analysis (TMPA) for the period 1998–2013 to study the diurnal cycle of precipitation in tropical cyclones. The comprehensive global coverage and large sample size afforded by the two datasets allow robust statistical analysis of storm-averaged diurnal variations and permit stratification of the data in various ways. There is a clearly detectable diurnal variation of precipitation in tropical cyclones with peak rainfall occurring near 0600 local time. For storms of all intensities the amplitude of the diurnal harmonic, which dominates the diurnal cycle, is approximately 7% of the mean rain rate. This corresponds to a peak-to-peak variation of about 15% over the course of the day. The diurnal cycle is similar in all ocean basins. There is evidence that the amplitude of the diurnal cycle increases with increasing storm intensity, but the results are not statistically significant. The results have implications for hurricane forecasting and for a greater understanding of the processes that regulate oceanic convection.
ISSN:0894-8755
1520-0442
DOI:10.1175/jcli-d-14-00804.1