World Library  


Add to Book Shelf
Flag as Inappropriate
Email this Book

The Effects of Turbulent Collision–coalescence on Precipitation Formation and Precipitation-dynamical Feedbacks in Simulations of Stratocumulus and Shallow Cumulus Convection : Volume 14, Issue 13 (01/07/2014)

By Franklin, C. N.

Click here to view

Book Id: WPLBN0003993952
Format Type: PDF Article :
File Size: Pages 14
Reproduction Date: 2015

Title: The Effects of Turbulent Collision–coalescence on Precipitation Formation and Precipitation-dynamical Feedbacks in Simulations of Stratocumulus and Shallow Cumulus Convection : Volume 14, Issue 13 (01/07/2014)  
Author: Franklin, C. N.
Volume: Vol. 14, Issue 13
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2014
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

APA MLA Chicago

Franklin, C. N. (2014). The Effects of Turbulent Collision–coalescence on Precipitation Formation and Precipitation-dynamical Feedbacks in Simulations of Stratocumulus and Shallow Cumulus Convection : Volume 14, Issue 13 (01/07/2014). Retrieved from http://www.ebooklibrary.org/


Description
Description: CSIRO Marine and Atmospheric Research, Aspendale, Victoria, Australia. A double moment warm rain scheme that includes the effects of turbulence on droplet collision rates has been implemented in a large-eddy model to investigate the impact of turbulence effects on clouds and precipitation. Simulations of shallow cumulus and stratocumulus show that different precipitation-dynamical feedbacks occur in these regimes when the effects of turbulence are included in the microphysical processes. In both cases inclusion of turbulent microphysics increases precipitation due to a more rapid conversion of cloud water to rain. In the shallow convection case, the greater water loading in the upper cloud levels reduces the buoyancy production of turbulent kinetic energy and the entrainment. The stratocumulus case on the other hand shows a weak positive precipitation feedback, with enhanced rainwater producing greater evaporation, stronger circulations and more turbulence. Sensitivity studies in which the cloud droplet number was varied show that greater number concentrations suppress the stratocumulus precipitation leading to larger liquid water paths. This positive second indirect aerosol effect shows no sensitivity to whether or not the effects of turbulence on droplet collision rates are included. While the sign of the second indirect effect is negative in the shallow convection case whether the effects of turbulence are considered or not, the magnitude of the effect is doubled when the turbulent microphysics are used. It is found that for these two different cloud regimes turbulence has a larger effect than cloud droplet number and the use of a different bulk microphysics scheme on producing rainfall in shallow cumuli. However, for the stratocumulus case examined here, the effects of turbulence on rainfall are not statistically significant and instead it is the cloud droplet number concentration or the choice of bulk microphysics scheme that has the largest control on the rain water.

Summary
The effects of turbulent collision–coalescence on precipitation formation and precipitation-dynamical feedbacks in simulations of stratocumulus and shallow cumulus convection

Excerpt
Feingold, G., Cotton, W. R., Stevens, B., and Frisch, S. A.: The relationship between in-cloud residence time and drizzle production in numerically simulated stratocumulus clouds, J. Atmos. Sci., 53, 1108–1122, 1996.; Franklin, C. N.: A warm rain microphysics parameterisation that includes the effects of turbulence, J. Atmos. Sci., 65, 1795–1816, 2008.; Ackerman, A. S., vanZanten, M. C., Stevens, B., Savic-Jovcic, V., Bretherton, C. S., Chlond, A., Golaz, J.-C., Jiang, H., Khairoutdinov, M., Krueger, S. K., Lewellen, D. C., Lock, A., Moeng, C.-H., Nakamura, K., Petters, M. D., Snider, J. R., Weinbrecht, S., and Zuluaf, M.: Large-eddy simulations of a drizzling, stratocumulus-topped marine boundary layer, Mon. Wea. Rev., 137, 1083–1110, 2009.; Albrecht, B. A.: Aerosols, cloud microphysics, and fractional cloudiness, Science, 245, 1227–1230, 1989.; Ayala, O., Rosa, B., Wang, L.-P., and Grabowksi, W.: Effects of turbulence on the geometric collision rate of sedimenting droplets. Part 2. Theory and parameterization, New J. Phys., 10, 075016, doi:10.1088/1367-2630/10/7/075016, 2008.; Beard, K. V. and Ochs, H. T.: Warm-rain initiation: An overview of microphysical mechanisms, J. Appl. Meteor., 32, 608–625, 1993; Franklin, C. N., Vaillancourt, P. A., and Yau, M. K.: Statistics and parameterisations of the effect of turbulence on the geometric collision kernel of cloud droplets, J. Atmos. Sci., 64, 938–945, 2007.; Grabowski, W. W. and Wang, L.-P.: Growth of cloud droplets in a turbulent environment, Ann. Rev. Fluid Mechanics, 45, 293–324, 2013.; Jiang, H. and Cotton, W. R.: Large eddy simulation of shallow cumulus convection during BOMEX: Sensitivity to microphysics and radiation, J. Atmos. Sci., 57, 582–594, 2000.; Khairoutdinov, M. and Kogan, Y.: A new cloud physics parameterisation in a large-eddy simulation model of marine stratocumulus, J. Atmos. Sci., 57, 229–243, 2000.; Kunnen, R. P. J., Siewert, C., Meinke, M., Schröder, W., and Beheng, K. D.: Numerically determined geometric collision kernels in spatially evolving isotropic turbulence relevant for droplets in clouds, Atmos. Res., 127, 8–21, 2013.; Matheou, G., Chung, D., Nuijens, L., Stevens, B., and Teixeira, J.: On the fidelity of large-eddy simulation of shallow precipitating cumulus convection, Mon. Wea. Rev., 139, 2918–2939, 2011.; Pinsky, M. B., Khain, A. P., Grits, B., and Shapiro, M.: Collisions of small drops in a turbulent flow. Part III: Relative droplet fluxes and swept volumes, J. Atmos. Sci., 63, 2123–2139, 2006.; Rauber, R. M., Ochs, H. T., Di Girolamo, L., Göke, S., Snodgrass, E., Stevens, B., Knight, C., Jensen, J. B., Lenschow, D. H., Rilling, R. A., Rogers, D. C., Stith, J. L., Albrecht, B. A., Zuidema, P., Blyth, A. M., Fairall, C. W., Brewer, W. A., Tucker, S., Lasher-Trapp, S. G., Mayol-Bracero, O. L., Vali, G., Geerts, B., Anderson, J. R., Baker, B. A., Lawson, R. P., Bandy, A. R., Thornton, D. C., Burnet, E., Brenguier, J.-L., Gomes, L., Brown, P. R. A., Chuang, P., Cotton, W. R., Gerber, H., Heikes, B. G., Hudson, J. G., Kollias, P., Krueger, S. K., Nuijens, L., O'Sullivan, D. W., Siebesma, A. P., and Twohy, C. H.: Rain in (shallow) cumulus over the ocean – the RICO campaign, B. Am. Meteor. Soc., 88, 1912–1928, 2007.; Saviv-Jovcic, V. and Stevens, B.: The structure and organization of precipitating stratocumulus, J. Atmos. Sci., 65, 1587–1605, 2008.; Seifert, A. and Beheng, K. D.: A double-moment parameterisation for simulating autoconversion, accretion and self collection, Atmos. Res., 59–60, 265–281, 2001.; Seifert, A. and Heus, T.: Large-eddy simulation of organized precipitating trade wind cumulus clouds, Atmos. Chem. Phys., 13, 5631–5645, doi:10.5194/acp-13-5631-2013, 2013.; Seifert, A., Nuijens, L., and Stevens, B.: Turbulence effects on warm-rain autoconversion in precipitating shallow convection, Q. J. Roy

 

Click To View

Additional Books


  • Bacteria in the Global Atmosphere – Part... (by )
  • Hydrogen Cyanide in the Upper Tropospher... (by )
  • Aerosol Direct Radiative Forcing During ... (by )
  • Direct Estimates of Emissions from the M... (by )
  • Long Term Measurements of Aerosol Optica... (by )
  • Including the Sub-grid Scale Plume Rise ... (by )
  • Photoinduced Oxidation of Sea Salt Halid... (by )
  • Brown Carbon and Water-soluble Organic A... (by )
  • Aerosol Optical Properties at Lampedusa ... (by )
  • Aerosols and Nucleation in Eastern China... (by )
  • Gas/Particle Partitioning of Water-solub... (by )
  • A Method to Generate Near Real Time Uv-i... (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.