Boundary layer technique applied to the master equation which describes the dissociation and recombination of diatomic molecules in inert diluents

1975 ◽  
Vol 63 (6) ◽  
pp. 2502-2506 ◽  
Author(s):  
W. L. Hogarth ◽  
D. L. S. McElwain
Keyword(s):  
Boundary Layer ◽  
Master Equation ◽  
Diatomic Molecules ◽  
Layer Technique

The noneouilibrium dissociation of diatomic molecules in a boundary layer

1985 ◽  
Vol 20 (1) ◽  
pp. 139-148 ◽  
Author(s):  
N. K. Makashev ◽  
V. P. Provotorov
Keyword(s):  
Boundary Layer ◽  
Diatomic Molecules

Birefringence in the Boundary Layer of a Rarefied Heat Conducting Gas

1981 ◽  
Vol 36 (6) ◽  
pp. 579-583
Author(s):  
P. Oudeman ◽  
J. Korving ◽  
H. F. P. Knaap ◽  
J. J. M. Beenakker
Keyword(s):  
Boundary Layer ◽  
Diatomic Molecules ◽  
Heat Conducting ◽  
Parallel Plates ◽  
Tensor Polarization ◽  
Angular Momenta ◽  
Rank Tensor

Abstract In a heat conducting gas of diatomic molecules enclosed between parallel plates, the second rank tensor polarization of the rotational angular momenta can be shown to be nonzero in a boundary layer near the plates, a few mean free paths thick. This phenomenon can be experimentally studied by measuring the birefringence of the boundary layer. Although the predicted effects are very small (An of the order of 10-14), the existence of this effect is clearly demonstrated and qualitative results are obtained for N2, CO and HD

scholarly journals On inferring isoprene emission surface flux from atmospheric boundary layer concentration measurements

2009 ◽  
Vol 9 (11) ◽  
pp. 3629-3640 ◽  
Author(s):  
J. Vilà-Guerau de Arellano ◽  
K. van den Dries ◽  
D. Pino
Keyword(s):  
Boundary Layer ◽  
Mixed Layer ◽  
Convective Boundary Layer ◽  
Surface Flux ◽  
Lapse Rate ◽  
Accurate Estimation ◽  
Emission Flux ◽  
Convective Boundary ◽  
Diurnal Variability ◽  
Layer Technique

Abstract. We examine the dependence of the inferred isoprene surface emission flux from atmospheric concentration on the diurnal variability of the convective boundary layer (CBL). A series of systematic numerical experiments carried out using the mixed-layer technique enabled us to study the sensitivity of isoprene fluxes to the entrainment process, the partition of surface fluxes, the horizontal advection of warm/cold air masses and subsidence. Our findings demonstrate the key role played by the evolution of boundary layer height in modulating the retrieved isoprene flux. More specifically, inaccurate values of the potential temperature lapse rate lead to changes in the dilution capacity of the CBL and as a result the isoprene flux may be overestimated or underestimated by as much as 20%. The inferred emission flux estimated in the early morning hours is highly dependent on the accurate estimation of the discontinuity of the thermodynamic values between the residual layer and the rapidly forming CBL. Uncertainties associated with the partition of the sensible and latent heat flux also yield large deviations in the calculation of the isoprene surface flux. Similar results are obtained if we neglect the influence of warm or cold advection in the development of the CBL. We show that all the above-mentioned processes are non-linear, for which reason the dynamic and chemical evolutions of the CBL must be solved simultaneously. Based on the discussion of our results, we suggest the measurements needed to correctly apply the mixed-layer technique in order to minimize the uncertainties associated with the diurnal variability of the convective boundary layer.

scholarly journals On inferring isoprene emission surface flux from atmospheric boundary layer concentration measurements

2009 ◽  
Vol 9 (1) ◽  
pp. 4159-4193
Author(s):  
J. Vilà-Guerau de Arellano ◽  
K. van den Dries ◽  
D. Pino
Keyword(s):  
Boundary Layer ◽  
Mixed Layer ◽  
Convective Boundary Layer ◽  
Surface Flux ◽  
Lapse Rate ◽  
Accurate Estimation ◽  
Emission Flux ◽  
Convective Boundary ◽  
Diurnal Variability ◽  
Layer Technique

Abstract. We examine the dependence of the inferred isoprene surface emission flux from atmospheric concentration on the diurnal variability of the convective boundary layer (CBL). A series of systematic numerical experiments carried out using the mixed-layer technique enabled us to study the sensitivity of isoprene fluxes to the entrainment process, the partition of surface fluxes, the horizontal advection of warm/cold air masses and subsidence. Our findings demonstrate the key role played by the evolution of boundary layer height in modulating the retrieved isoprene flux. More specifically, inaccurate values of the potential temperature lapse rate lead to changes in the dilution capacity of the CBL and as a result the isoprene flux may be overestimated or underestimated by as much as 20%. The inferred emission flux estimated in the early morning hours is highly dependent on the accurate estimation of the discontinuity of the thermodynamic values between the residual layer and the rapidly forming CBL. Uncertainties associated with the partition of the sensible and latent heat flux also yield large deviations in the calculation of the isoprene surface flux. Similar results are obtained if we neglect the influence of warm or cold advection in the development of the CBL. We show that all the above-mentioned processes are non-linear, for which reason the dynamic and chemical evolutions of the CBL must be solved simultaneously. Based on the discussion of our results, we suggest the measurements needed to correctly apply the mixed-layer technique in order to minimize the uncertainties associated with the diurnal variability of the convective boundary layer.

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