A microphysical analysis of elevated convection in the comma head region of continental winter cyclones

Amanda M. Murphy, Robert M Rauber, Greg Michael McFarquhar, Joseph A. Finlon, David M. Plummer, Andrew A. Rosenow, Brian F. Jewett

Research output: Contribution to journalArticle

Abstract

An analysis of the microphysical structure of elevated convection within the comma head region of two winter cyclones over the midwestern United States is presented using data from the Wyoming Cloud Radar (WCR) and microphysical probes on the NSF/NCAR C-130 aircraft during the Profiling of Winter Storms campaign. The aircraft penetrated 36 elevated convective cells at various temperatures T and distances below cloud top zd. The statistical properties of ice water content (IWC), liquid water content (LWC), ice particle concentration with diameter > 500 μm N > 500, and median mass diameter Dmm, as well as particle habits within these cells were determined as functions of zd and T for active updrafts and residual stratiform regions originating from convective towers that ascended through unsaturated air. Insufficient data were available for analysis within downdrafts. For updrafts stratified by zd, distributions of IWC, N > 500, and Dmm for all zd between 1000 and 4000 m proved to be statistically indistinct. These results imply that turbulence and mixing within the updrafts effectively distributed particles throughout their depths. A decrease in IWC and N > 500 in the layer closest to cloud top was likely related to cloud-top entrainment. Within residual stratiform regions, decreases in IWC and N > 500 and increases in Dmm were observed with depth below cloud top. These trends are consistent with particles falling and aggregating while entrainment and subsequent sublimation was occurring.

Original languageEnglish (US)
Pages (from-to)69-91
Number of pages23
JournalJournal of the Atmospheric Sciences
Volume74
Issue number1
DOIs
StatePublished - Jan 1 2017

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cyclone
convection
water content
updraft
ice
winter
entrainment
aircraft
sublimation
turbulence
probe
analysis
radar
liquid
particle
air
temperature

Keywords

  • Cloud microphysics
  • Convective clouds
  • Winter/cool season

ASJC Scopus subject areas

  • Atmospheric Science

Cite this

A microphysical analysis of elevated convection in the comma head region of continental winter cyclones. / Murphy, Amanda M.; Rauber, Robert M; McFarquhar, Greg Michael; Finlon, Joseph A.; Plummer, David M.; Rosenow, Andrew A.; Jewett, Brian F.

In: Journal of the Atmospheric Sciences, Vol. 74, No. 1, 01.01.2017, p. 69-91.

Research output: Contribution to journalArticle

Murphy, Amanda M. ; Rauber, Robert M ; McFarquhar, Greg Michael ; Finlon, Joseph A. ; Plummer, David M. ; Rosenow, Andrew A. ; Jewett, Brian F. / A microphysical analysis of elevated convection in the comma head region of continental winter cyclones. In: Journal of the Atmospheric Sciences. 2017 ; Vol. 74, No. 1. pp. 69-91.
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