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Title: New Tracer Advection Schemes for CAM-SE.


Abstract not provided.

Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
Report Number(s):
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: Proposed for presentation at the ACES4BGC All Hands Project Meeting held February 27, 2014 in Boulder, CO.
Country of Publication:
United States

Citation Formats

Peterson, Kara J., and Taylor, Mark A. New Tracer Advection Schemes for CAM-SE.. United States: N. p., 2014. Web.
Peterson, Kara J., & Taylor, Mark A. New Tracer Advection Schemes for CAM-SE.. United States.
Peterson, Kara J., and Taylor, Mark A. 2014. "New Tracer Advection Schemes for CAM-SE.". United States. doi:.
title = {New Tracer Advection Schemes for CAM-SE.},
author = {Peterson, Kara J. and Taylor, Mark A.},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2014,
month = 2

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  • While most air quality models use some sort of scheme to make wind fields mass consistent, the adjustment of the wind field has to be limited to make sure that the final wind field is close to the observed winds. This paper considers the effect of these errors within the framework of two classes of advection routines based on alternative forms of the advection equation. These are the Bott (1989) scheme that solves the flux or conservative form of the governing transport equation, and the cubic-spline semi-Lagrangian scheme that solves the advective or primitive form of the transport equation. Whilemore » the flux scheme conserves mass integrated over the modeling domain, it does not conserve the ratio of concentrations of different species-mixing ratio, if the wind field is not mass consistent. On the other hand, the semi-Lagrangian scheme does conserve mixing ratio, but is not designed to conserve mass globally. In this study, the authors evaluate the sensitivity of the flux and advective transport schemes to degrees of mass inconsistency in wind fields.« less
  • Six simple numerical advection schemes for calculating the advection of atmospheric pollutants are compared. These schemes are donor cell (a variant of upwind differencing); fully implicit; Crank-Nicolson; second moment method; quasi-Lagrangian-cubic spline; and chapeau function. The donor cell technique requires the least computation effort, but is the least accurate of the six methods when compared on the basis of artificial dispersion and dissipation. The remaining five schemes require about the same programming effort and computer running time but yield substantially more accurate results. The fully implicit scheme is often less dissipative than the donor cell technique but is still unacceptablymore » inaccurate. Little or no artificial dissipation is manifested by the final four schemes. Numerical calculations with constant and variable advection velocities support these conclusions.« less
  • Extended particle-in-cell (EPIC) schemes are considered with a view to applications in electrostatic drift-wave turbulence and ordinary hydrodynamical turbulence, where periodic boundary conditions are inappropiate. We treat issues relating to the dual particle-mesh representation and to the need to follow particle orbits accurately. A successful application of EPIC to an advection dominated flow is demonstrated. The errors are quantified so that choosing suitable numerical parameters to obtain a result of a given accuracy is straightforward. 30 refs., 4 figs., 2 tabs.
  • A general method for building multidimensional shape preserving advection schemes using flux limiters is presented. The method works for advected passive scalars in either compressible or incompressible flow and on arbitrary grids. With a minor modification it can be applied to the equation for fluid density. Schemes using the simplest form of the flux limiter can cause distortion of the advected profile, particularly sideways spreading, depending on the orientation of the flow relative to the grid. This is partly because the simple limiter is too restrictive. However, some straightforward refinements lead to a shape-preserving scheme that gives satisfactory results, withmore » negligible grid-flow angle-dependent distortion.« less