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Origin of outer tropical cyclone rainbands
Cheng-Ku Yu1, Che-Yu Lin2, Chi-Hang Pun2
1Department of Atmospheric Sciences, National Taiwan University, Taipei, Taiwan. yuku@ntu.edu.tw.
Nature Communications
|November 4, 2023
Summary
Outer tropical cyclone rainbands (TCRs) form predominantly from external origins, challenging previous inner-origin theories. Preexisting precipitation influences TCR development, with squall-line dynamics playing a key role.
Area of Science:
- Meteorology
- Atmospheric Science
- Tropical Cyclone Research
Background:
- Outer tropical cyclone rainbands (TCRs) are zones of intense precipitation and hazardous weather within tropical cyclones (TCs).
- The origins of these outer TCRs are not well understood, despite their significant societal risk.
Purpose of the Study:
- To investigate the formation mechanisms and origins of outer tropical cyclone rainbands (TCRs).
- To establish a comprehensive understanding of the natural diversity in TCR origins using observational data.
Main Methods:
- Identification of 1029 outer TCRs during their formation from 95 TCs.
- Analysis of a large dataset of radar observations to study rainband origins and dynamics.
Main Results:
- Observed outer TCRs predominantly originate from external (outer) sources, contradicting theoretical models suggesting inner origins.
- Squall-line dynamics are a frequent, but not exclusive, mechanism for outer TCR formation.
- The presence of pre-existing outer precipitation significantly influences both squall-line and non-squall-line TCR initiation.
Conclusions:
- The study provides observational evidence supporting an outer origin for most TCRs, necessitating a revision of existing theoretical frameworks.
- Understanding the role of preexisting precipitation and diverse formation mechanisms is crucial for accurate TC forecasting and risk assessment.
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