A Metric for Rainfall Asymmetry in Recurving Tropical Cyclones

Research output: Contribution to journalArticle

Abstract

Using a data set of 138 recurving tropical cyclones (TCs) from 2004 to 2015 in the western North Pacific, a new metric, Brain, is proposed, which quantifies the asymmetry in the rainfall within the TC circulation relative to its track. When Brain is positive (negative), the rainfall has a right of track (left of track) preference. Using the new metric, the rainfall asymmetry is found to be closely related to thermal structure asymmetry (B) in TCs. A well-defined anticorrelated relationship is found between Brain and B for all recurving TCs. Prior to recurvature, Brain decreases linearly as B increases. After recurvature, the linear relationship weakens, and TC rainfall is almost entirely concentrated left of track as B increases. A phase-space composed of Brain and B provides substantial insight into cyclone structural and rainfall asymmetric evolution.

Original languageEnglish (US)
Pages (from-to)6741-6749
Number of pages9
JournalGeophysical Research Letters
Volume45
Issue number13
DOIs
StatePublished - Jul 16 2018
Externally publishedYes

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cyclones
tropical cyclone
brain
asymmetry
rainfall
thermal structure
cyclone

Keywords

  • metric
  • rainfall asymmetry
  • recurving tropical cyclones

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

A Metric for Rainfall Asymmetry in Recurving Tropical Cyclones. / Deng, Difei; Ritchie, Elizabeth A.

In: Geophysical Research Letters, Vol. 45, No. 13, 16.07.2018, p. 6741-6749.

Research output: Contribution to journalArticle

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