Microphysical and Kinematic Structure of Convective-Scale Elements in the Inner Rainband of Typhoon Matmo (2014) After Landfall

Mingjun Wang, Kun Zhao, Wen Chau Lee, Fuqing Zhang

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The detailed microphysical structure and processes associated with the kinematic structure of the inner rainband of Typhoon Matmo (2014) over East China were examined using observations from an S band polarimetric Doppler radar and an S band Doppler radar. The kinematic structure of convective cells within the inland inner rainband was similar to that of the principal rainband over the ocean in terms of both updrafts and downdrafts. The hydrometeors within convective regions above the freezing level presented a layered pattern, with ice crystals at the top, dry snow in the middle, and graupel at the bottom just above the freezing level. Dry snow and graupel particles were mainly distributed downwind in relation to the overturning updraft. Heavy rainfall occurred mostly in the updraft region and the region affected by graupel. To further investigate the formation of heavy rainfall, variations in reflectivity, differential reflectivity, and rainwater content within different layers were examined. Two distinct mechanisms were identified: (1) in the updraft region the heavy rainfall was predominantly produced through warm-rain processes of autoconversion, accretion, and coalescence between 0.5 and 5 km in altitude; and (2) outside the updraft region, the heavy rainfall was mainly produced through melting of graupel particles. Evaporation was also observed within the radial inflow layer, most likely due to the cool dry air transported by the low-level downdraft. This study revealed, for the first time, the interactions between the microphysical and kinematic structure and the vertical evolution of warm-rain processes in the inner rainbands of tropical cyclones after landfall.

Original languageEnglish (US)
Pages (from-to)6549-6564
Number of pages16
JournalJournal of Geophysical Research: Atmospheres
Volume123
Issue number12
DOIs
StatePublished - Jun 27 2018

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vertical air currents
rainband
graupel
updraft
typhoon
kinematics
Rain
Kinematics
rain
Doppler radar
rainfall
S band
snow
reflectivity
freezing
Snow
Freezing
hydrometeors
reflectance
cyclones

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

Cite this

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title = "Microphysical and Kinematic Structure of Convective-Scale Elements in the Inner Rainband of Typhoon Matmo (2014) After Landfall",
abstract = "The detailed microphysical structure and processes associated with the kinematic structure of the inner rainband of Typhoon Matmo (2014) over East China were examined using observations from an S band polarimetric Doppler radar and an S band Doppler radar. The kinematic structure of convective cells within the inland inner rainband was similar to that of the principal rainband over the ocean in terms of both updrafts and downdrafts. The hydrometeors within convective regions above the freezing level presented a layered pattern, with ice crystals at the top, dry snow in the middle, and graupel at the bottom just above the freezing level. Dry snow and graupel particles were mainly distributed downwind in relation to the overturning updraft. Heavy rainfall occurred mostly in the updraft region and the region affected by graupel. To further investigate the formation of heavy rainfall, variations in reflectivity, differential reflectivity, and rainwater content within different layers were examined. Two distinct mechanisms were identified: (1) in the updraft region the heavy rainfall was predominantly produced through warm-rain processes of autoconversion, accretion, and coalescence between 0.5 and 5 km in altitude; and (2) outside the updraft region, the heavy rainfall was mainly produced through melting of graupel particles. Evaporation was also observed within the radial inflow layer, most likely due to the cool dry air transported by the low-level downdraft. This study revealed, for the first time, the interactions between the microphysical and kinematic structure and the vertical evolution of warm-rain processes in the inner rainbands of tropical cyclones after landfall.",
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Microphysical and Kinematic Structure of Convective-Scale Elements in the Inner Rainband of Typhoon Matmo (2014) After Landfall. / Wang, Mingjun; Zhao, Kun; Lee, Wen Chau; Zhang, Fuqing.

In: Journal of Geophysical Research: Atmospheres, Vol. 123, No. 12, 27.06.2018, p. 6549-6564.

Research output: Contribution to journalArticle

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