Articles | Volume 10, issue 5
Atmos. Chem. Phys., 10, 2551–2560, 2010
Atmos. Chem. Phys., 10, 2551–2560, 2010

  12 Mar 2010

12 Mar 2010

Parameterization of subgrid plume dilution for use in large-scale atmospheric simulations

A. D. Naiman1, S. K. Lele1, J. T. Wilkerson2, and M. Z. Jacobson2 A. D. Naiman et al.
  • 1Aeronautics and Astronautics, Stanford University, Stanford, CA, USA
  • 2Civil and Environmental Engineering, Stanford University, Stanford, CA, USA

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.

Final-revised paper