Stratocumulus cloud clearings and notable thermodynamic and aerosol contrasts across the clear-cloudy interface

Ewan Crosbie, Zhen Wang, Armin Sorooshian, Patrick Y. Chuang, Jill S. Craven, Matthew M. Coggon, Michael Brunke, Xubin Zeng, Haflidi Jonsson, Roy K. Woods, Richard C. Flagan, John H. Seinfeld

Research output: Contribution to journalArticle

20 Scopus citations

Abstract

Data from three research flights, conducted over water near the California coast, are used to investigate the boundary between stratocumulus cloud decks and clearings of different sizes. Large clearings exhibit a diurnal cycle with growth during the day and contraction overnight and a multiday life cycle that can include oscillations between growth and decay, whereas a small coastal clearing was observed to be locally confined with a subdiurnal lifetime. Subcloud aerosol characteristics are similar on both sides of the clear-cloudy boundary in the three cases, while meteorological properties exhibit subtle, yet important, gradients, implying that dynamics, and not microphysics, is the primary driver for the clearing characteristics. Transects, made at multiple levels across the cloud boundary during one flight, highlight the importance of microscale (~1 km) structure in thermodynamic properties near the cloud edge, suggesting that dynamic forcing at length scales comparable to the convective eddy scale may be influential to the larger-scale characteristics of the clearing. These results have implications for modeling and observational studies of marine boundary layer clouds, especially in relation to aerosol-cloud interactions and scales of variability responsible for the evolution of stratocumulus clearings.

Original languageEnglish (US)
Pages (from-to)1083-1099
Number of pages17
JournalJournal of the Atmospheric Sciences
Volume73
Issue number3
DOIs
StatePublished - Mar 1 2016

Keywords

  • Aerosols
  • Aircraft observations
  • Atm/Ocean structure/phenomena
  • Boundary layer
  • Cloud cover
  • Geographic location/entity
  • North Pacific Ocean
  • Observational techniques and algorithms
  • Physical meteorology and climatology
  • Thermodynamics

ASJC Scopus subject areas

  • Atmospheric Science

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    Crosbie, E., Wang, Z., Sorooshian, A., Chuang, P. Y., Craven, J. S., Coggon, M. M., Brunke, M., Zeng, X., Jonsson, H., Woods, R. K., Flagan, R. C., & Seinfeld, J. H. (2016). Stratocumulus cloud clearings and notable thermodynamic and aerosol contrasts across the clear-cloudy interface. Journal of the Atmospheric Sciences, 73(3), 1083-1099. https://doi.org/10.1175/JAS-D-15-0137.1