Structure and evolution of line-shaped convective systems associated with Changma front during GRL PHONE-09: 6 July 2009 case

Jong Hoon Jeong, Dong In Lee, Chung Chieh Wang, Sang Min Jang, Sung Hwa Park, Sung A. Jung

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

This study investigates the structure and evolution of line-shaped convective systems (LCSs) associated with the Changma front observed over Chujado in the southwestern Korean Peninsula by using intensive observational data from upper-air sounding and Doppler radars. LCSs embedded as a multicellular precipitation system developed north of the warm front and persisted for 4 h. With continuous new cells development, the convective cells gradually strengthened and merged into the LCSs and exhibited a high low-level mixing ratio, weak vertical wind shear, and negligible instability. A rear-to-front jet corresponding to a low-level jet (LLJ) was concurrent with a high equivalent potential temperature (θe) environmental inflow over the warm front, which suggests that the rear-to-front jet with moist air induced destabilization. Three-dimensional kinematic and reflectivity structures of the LCSs exhibited homogeneous southerly and southwesterly winds with height, small horizontal wind shear, and convergence. Transfer of positive u and v momentum upward by convective eddies into the LCSs and of horizontal momentum occurred through organized convection; both these transfers acted to intensify the LLJ.

Original languageEnglish
Pages (from-to)786-794
Number of pages9
JournalMeteorological Applications
Volume21
Issue number3
DOIs
Publication statusPublished - 2014 Jul

Keywords

  • GRL PHONE
  • Line-shaped convective systems
  • Low level jet
  • Warm front

ASJC Scopus subject areas

  • Atmospheric Science

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