Parameterization of subgrid plume dilution for use in large-scale atmospheric simulations 1Aeronautics and Astronautics, Stanford University, Stanford, CA, USA
2Civil and Environmental Engineering, Stanford University, Stanford, CA, USA
Received: 22 October 2009 – Published in Atmos. Chem. Phys. Discuss.: 18 November 2009 Abstract. A new model of plume dynamics has been developed for use as a subgrid model of plume dilution
in a large-scale atmospheric simulation.
The model uses mean wind, shear, and diffusion parameters derived from the local
large-scale variables to advance the plume cross-sectional shape and area in time. Comparisons with a large
eddy simulation of aircraft emission plume dynamics, with an analytical solution to the dynamics of a
sheared Gaussian plume, and with measurements of aircraft exhaust plume dilution at cruise altitude
show good agreement with these previous studies. We argue that the model also provides a reasonable
approximation of line-shaped contrail dilution and give an example of how it can be applied
in a global climate model.
Revised: 25 February 2010 – Accepted: 02 March 2010 – Published: 12 March 2010
Citation: Naiman, A. D., Lele, S. K., Wilkerson, J. T., and Jacobson, M. Z.: Parameterization of subgrid plume dilution for use in large-scale atmospheric simulations, Atmos. Chem. Phys., 10, 2551-2560, doi:10.5194/acp-10-2551-2010, 2010.