Flux-Profile Relationship for Dust Concentration in the Stratified Atmospheric Surface Layer

L. S. Freire, Marcelo Chamecki, J. A. Gillies

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Flux-profile relationships are usually obtained under the assumption that the mean field of interest is in equilibrium with the associated surface fluxes. In this study, the existence of an equilibrium state for dust concentration in the atmospheric surface layer above sources and sinks is evaluated using large-eddy simulation. Results show that for steady-state turbulence and negligible horizontal advection, an equilibrium mean vertical profile of dust concentration is reached after one boundary-layer eddy turnover time. This is true for cases over a source or sink, under different atmospheric stabilities, and for particles with negligible or significant settling velocity. A new model relating the net surface flux to the vertical concentration profile that accounts for both atmospheric stability and particle settling velocity is proposed. The model compares well with the simulation results for all particle sizes and atmospheric stability conditions evaluated, and it can be used to estimate the concentration profile based on the surface flux, and also to estimate the surface flux by fitting the vertical concentration profile. The resulting equation can be considered as an extension of Monin-Obukhov similarity theory to the concentration of settling particles, such as mineral dust, sea-salt, pollen and other suspended aerosols.

Original languageEnglish (US)
Pages (from-to)249-267
Number of pages19
JournalBoundary-Layer Meteorology
Volume160
Issue number2
DOIs
StatePublished - Aug 1 2016

Fingerprint

surface flux
surface layer
dust
particle settling
settling velocity
large eddy simulation
sea salt
vertical profile
eddy
turnover
advection
pollen
boundary layer
turbulence
particle size
aerosol
mineral
simulation

All Science Journal Classification (ASJC) codes

  • Atmospheric Science

Cite this

Freire, L. S. ; Chamecki, Marcelo ; Gillies, J. A. / Flux-Profile Relationship for Dust Concentration in the Stratified Atmospheric Surface Layer. In: Boundary-Layer Meteorology. 2016 ; Vol. 160, No. 2. pp. 249-267.
@article{df155ee1445d4fe58f4f038fc8bde6b8,
title = "Flux-Profile Relationship for Dust Concentration in the Stratified Atmospheric Surface Layer",
abstract = "Flux-profile relationships are usually obtained under the assumption that the mean field of interest is in equilibrium with the associated surface fluxes. In this study, the existence of an equilibrium state for dust concentration in the atmospheric surface layer above sources and sinks is evaluated using large-eddy simulation. Results show that for steady-state turbulence and negligible horizontal advection, an equilibrium mean vertical profile of dust concentration is reached after one boundary-layer eddy turnover time. This is true for cases over a source or sink, under different atmospheric stabilities, and for particles with negligible or significant settling velocity. A new model relating the net surface flux to the vertical concentration profile that accounts for both atmospheric stability and particle settling velocity is proposed. The model compares well with the simulation results for all particle sizes and atmospheric stability conditions evaluated, and it can be used to estimate the concentration profile based on the surface flux, and also to estimate the surface flux by fitting the vertical concentration profile. The resulting equation can be considered as an extension of Monin-Obukhov similarity theory to the concentration of settling particles, such as mineral dust, sea-salt, pollen and other suspended aerosols.",
author = "Freire, {L. S.} and Marcelo Chamecki and Gillies, {J. A.}",
year = "2016",
month = "8",
day = "1",
doi = "10.1007/s10546-016-0140-2",
language = "English (US)",
volume = "160",
pages = "249--267",
journal = "Boundary-Layer Meteorology",
issn = "0006-8314",
publisher = "Springer Netherlands",
number = "2",

}

Flux-Profile Relationship for Dust Concentration in the Stratified Atmospheric Surface Layer. / Freire, L. S.; Chamecki, Marcelo; Gillies, J. A.

In: Boundary-Layer Meteorology, Vol. 160, No. 2, 01.08.2016, p. 249-267.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Flux-Profile Relationship for Dust Concentration in the Stratified Atmospheric Surface Layer

AU - Freire, L. S.

AU - Chamecki, Marcelo

AU - Gillies, J. A.

PY - 2016/8/1

Y1 - 2016/8/1

N2 - Flux-profile relationships are usually obtained under the assumption that the mean field of interest is in equilibrium with the associated surface fluxes. In this study, the existence of an equilibrium state for dust concentration in the atmospheric surface layer above sources and sinks is evaluated using large-eddy simulation. Results show that for steady-state turbulence and negligible horizontal advection, an equilibrium mean vertical profile of dust concentration is reached after one boundary-layer eddy turnover time. This is true for cases over a source or sink, under different atmospheric stabilities, and for particles with negligible or significant settling velocity. A new model relating the net surface flux to the vertical concentration profile that accounts for both atmospheric stability and particle settling velocity is proposed. The model compares well with the simulation results for all particle sizes and atmospheric stability conditions evaluated, and it can be used to estimate the concentration profile based on the surface flux, and also to estimate the surface flux by fitting the vertical concentration profile. The resulting equation can be considered as an extension of Monin-Obukhov similarity theory to the concentration of settling particles, such as mineral dust, sea-salt, pollen and other suspended aerosols.

AB - Flux-profile relationships are usually obtained under the assumption that the mean field of interest is in equilibrium with the associated surface fluxes. In this study, the existence of an equilibrium state for dust concentration in the atmospheric surface layer above sources and sinks is evaluated using large-eddy simulation. Results show that for steady-state turbulence and negligible horizontal advection, an equilibrium mean vertical profile of dust concentration is reached after one boundary-layer eddy turnover time. This is true for cases over a source or sink, under different atmospheric stabilities, and for particles with negligible or significant settling velocity. A new model relating the net surface flux to the vertical concentration profile that accounts for both atmospheric stability and particle settling velocity is proposed. The model compares well with the simulation results for all particle sizes and atmospheric stability conditions evaluated, and it can be used to estimate the concentration profile based on the surface flux, and also to estimate the surface flux by fitting the vertical concentration profile. The resulting equation can be considered as an extension of Monin-Obukhov similarity theory to the concentration of settling particles, such as mineral dust, sea-salt, pollen and other suspended aerosols.

UR - http://www.scopus.com/inward/record.url?scp=84961169430&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84961169430&partnerID=8YFLogxK

U2 - 10.1007/s10546-016-0140-2

DO - 10.1007/s10546-016-0140-2

M3 - Article

AN - SCOPUS:84961169430

VL - 160

SP - 249

EP - 267

JO - Boundary-Layer Meteorology

JF - Boundary-Layer Meteorology

SN - 0006-8314

IS - 2

ER -