World Library  

Add to Book Shelf
Flag as Inappropriate
Email this Book

On Clocks and Clouds : Volume 13, Issue 9 (06/09/2013)

By Witte, M. K.

Click here to view

Book Id: WPLBN0003996349
Format Type: PDF Article :
File Size: Pages 30
Reproduction Date: 2015

Title: On Clocks and Clouds : Volume 13, Issue 9 (06/09/2013)  
Author: Witte, M. K.
Volume: Vol. 13, Issue 9
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


APA MLA Chicago

Feingold, G., Chuang, P. Y., & Witte, M. K. (2013). On Clocks and Clouds : Volume 13, Issue 9 (06/09/2013). Retrieved from

Description: Earth and Planetary Sciences, University of California Santa Cruz, Santa Cruz, CA, USA. Cumulus clouds exhibit a life cycle that consists of: (a) the growth phase (increasing size, most notably in the vertical direction); (b) the mature phase (growth ceases; any precipitation that develops is strongest during this period); and (c) the dissipation phase (cloud dissipates because of precipitation and/or entrainment; no more dynamical support). Although radar can track clouds over time and give some sense of the age of a cloud, most aircraft in situ measurements lack temporal context. We use large eddy simulations of trade wind cumulus cloud fields from cases during the Barbados Oceanographic and Meteorological Experiment (BOMEX) and Rain In Cumulus over the Ocean (RICO) campaigns to demonstrate a potential cumulus cloud clock. We find that the volume-averaged total water mixing ratio rt is a useful cloud clock for the 12 clouds studied. A cloud's initial rt is set by the subcloud mixed-layer mean rt and decreases monotonically from the initial value due primarily to entrainment. The clock is insensitive to aerosol loading, environmental sounding and extrinsic cloud properties such as lifetime and volume. In some cases (more commonly for larger clouds), multiple pulses of buoyancy occur, which complicate the cumulus clock by replenishing rt. The clock is most effectively used to classify clouds by life phase.

On clocks and clouds

Dawe, J. T. and Austin, P. H.: Statistical analysis of an LES shallow cumulus cloud ensemble using a cloud tracking algorithm, Atmos. Chem. Phys., 12, 1101–1119, doi:10.5194/acp-12-1101-2012, 2012.; de Rooy, W., Bechtold, P. , Fröhlich, K., Hohenegger, C., Jonker, H., Mironov, D., Siebesma, D., Teixeira, J., and Yano, J.-I.: Entrainment and detrainment in cumulus convection: an overview, Q. J. Roy. Meteorol. Soc., 139, 1–19, 2013.; Fielding, M., Chiu, J., Hogan, R., and Feingold, G.: 3D cloud reconstructions: Evaluation of scanning radar scan strategy with a view to shortwave radiation closure, J. Geophys. Res., 118, doi:10.1002/jgrd.50614, 2013.; Heus, T., Jonker, H., Van den Akker, H., Griffith, E., Koutek, M., and Post, F.: A statistical approach to the life cycle analysis of cumulus clouds selected in a virtual reality environment, J. Geophys. Res., 114, D06208, doi:10.1029/2008JD010917, 2009.; Jiang, H., Xue, H., Teller, A., Feingold, G., and Levin, Z.: Aerosol effects on the lifetime of shallow cumulus, Geophys. Res. Lett., 33, L14806, doi:10.1029/2006GL026024, 2006.; Jiang, H., Feingold, G., and Koren, I.: Effect of aerosol on trade cumulus cloud morphology, J. Geophys. Res., 114, D11209, doi:10.1029/2009JD011750, 2009.; Jiang, H., Feingold, G., and Sorooshian, A.: Effect of aerosol on the susceptibility and efficiency of precipitation in warm trade cumulus clouds, J. Atmos. Sci., 67, 3525–3540, 2010.; Koren, I., Altaratz, O., Feingold, G., Levin, Z., and Reisin, T.: Cloud's Center of Gravity – a compact approach to analyze convective cloud development, Atmos. Chem. Phys., 9, 155–161, doi:10.5194/acp-9-155-2009, 2009.; Popper, K. R.: Objective Knowledge: An Evolutionary Approach, revised ed., Oxford University Press, USA, 1972.; Stevens, B.: Atmospheric moist convection, Annu. Rev. Earth Planet. Sci., 33, 605–643, 2005.; Xue, H. and Feingold, G.: Large-eddy simulations of trade wind cumuli: Investigation of aerosol indirect effects, J. Atmos. Sci., 63, 1605–1622, 2006.


Click To View

Additional Books

  • Airborne Measurements of Gas and Particl... (by )
  • Linking Climate and Air Quality Over Eur... (by )
  • Deposition and Immersion-mode Nucleation... (by )
  • Cold and Transition Season Cloud Condens... (by )
  • Assessment of the Reduction Methods Used... (by )
  • Missing Peroxy Radical Sources Within a ... (by )
  • Gravitational Separation in the Stratosp... (by )
  • Functional Group Composition of Ambient ... (by )
  • Wavelength Dependence of Isotope Fractio... (by )
  • Emergence of a Linear Tracer Source from... (by )
  • Hygroscopicity of Aerosol and Its Organi... (by )
  • An Aerocom Assessment of Black Carbon in... (by )
Scroll Left
Scroll Right


Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.