Forward-in-time and Backward-in-time Dispersion in the Convective Boundary Layer: the Concentration Footprint

Cai, Xuhui; Leclerc, Monique Y.

doi:10.1007/s10546-006-9141-x

Forward-in-time and Backward-in-time Dispersion in the Convective Boundary Layer: the Concentration Footprint

Journal Article · Thu Dec 07 23:00:00 EST 2006 · Boundary-Layer Meteorology

DOI:https://doi.org/10.1007/s10546-006-9141-x· OSTI ID:929548

Cai, Xuhui ^[1]; Leclerc, Monique Y.

The University of Georgia

The turbulence field obtained using a large-eddy simulation model is used to simulate particle dispersion in the convective boundary layer with both forward-in-time and backward-in-time modes. A Lagrangian stochastic model is used to treat subgrid-scale turbulence. Results of forward dispersion match both laboratory experiments and previous numerical studies for different release heights in the convective boundary layer. Results obtained from backward dispersion show obvious asymmetry when directly compared to results from forward dispersion. However, a direct comparison of forward and backward dispersion has no apparent physical meaning and might be misleading. Results of backward dispersion can be interpreted as three-dimensional or generalized concentration footprints, which indicate that sources in the entire boundary layer, not only sources at the surface, may influence a concentration measurement at a point. Footprints at four source heights in the convective boundary layer corresponding to four receptors are derived using forward and backward dispersion methods. The agreement among footprints derived with forward and backward methods illustrates the equivalence between both approaches. The paper shows explicitly that Lagrangian simulations can yield identical footprints using forward and backward methods in horizontally homogeneous turbulence.

Research Organization:: Univ. of Georgia, Athens, GA (United States)

Sponsoring Organization:: USDOE Office of Energy Research (ER)

DOE Contract Number:: FG02-00ER63024

OSTI ID:: 929548

Report Number(s):: DOE/ER63024-10

Journal Information:: Boundary-Layer Meteorology, Journal Name: Boundary-Layer Meteorology Journal Issue: 2 Vol. 123; ISSN 0006-8314

Publisher:: Springer

Country of Publication:: United States

Language:: English

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54 ENVIRONMENTAL SCIENCES
Concentration footprint
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