Multiday evolution of convective bursts during western North Pacific tropical cyclone development and nondevelopment using geostationary satellite measurements

Minhee Chang, Chang Hoi Ho, Myung Sook Park, Jinwon Kim, Myoung Hwan Ahn

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


Tropical cyclones (TCs) develop through latent heating from a series of deep convection. To investigate the evolution of diurnal convective burst (CB) activities prior to TC formation, we analyzed 463 tropical disturbances that developed (80) or not developed (383) into TCs over the western North Pacific during the 2007-2009 period. Geostationary satellite data allowed defining deep convection where infrared (IR) brightness temperature is lower than that of water vapor (WV). Diurnal expansions from time series of IR minus WV < 0 areas near disturbance vortex centers for 5 days are defined as CB events. Combined analysis with the Modern Era Retrospective-Analysis shows that the multiday convective-environmental evolution for TC formation is entirely different from nonformation processes in terms of the occurrence of two consecutive diurnal CB events. Multiday CBs (mCB) are observed in 67.5% of the 80 TC formation cases and in 13.8% of the 383 nonformation cases. Intensities of the middle-to-low tropospheric relative vorticity of these two groups are comparable on 4 to 5 days prior to TC formation. However, vorticity intensification is weak for nondeveloping disturbances in environments of strong vertical wind shear; these disturbances eventually decay. The vorticity of developing disturbances continuously intensifies to TC strengths. The remaining 32.5% of the TC cases without mCB show weaker initial vorticity, but rapid intensification over 3 day periods before TC formation. The present results reveal that mCB is a common feature in pre-TC stages, and large-scale environments of weak vertical wind shear are critical for the formation of TC-strength circulations.

Original languageEnglish
Pages (from-to)1635-1649
Number of pages15
JournalJournal of Geophysical Research C: Oceans
Issue number3
StatePublished - 16 Feb 2017

Bibliographical note

Funding Information:
This work was funded by the Korea Ministry of Environment as Climate Change Correspondence R&D Program and the Korea Meteorological Administration Research and Development Program under grant KMIPA2015-1100. MTSAT-1R data are obtained offline from National Meteorological Satellite Center. TRMM and MERRA data are obtained online from GES DISC at the Goddard Space Flight Center website ( mirador/ project=TRMM&tree=project, and MERRA/, respectively).

Publisher Copyright:
© 2017. American Geophysical Union. All Rights Reserved.


Dive into the research topics of 'Multiday evolution of convective bursts during western North Pacific tropical cyclone development and nondevelopment using geostationary satellite measurements'. Together they form a unique fingerprint.

Cite this