The response of atmospheric chemistry to dynamical boundary layer processes associated to temporal transitions and surface heterogeneity

H.G. Ouwersloot, J. Vilà-Guerau de Arellano, A.C. Nölscher, M.C. Krol, L.N. Ganzeveld, C. Breitenberger, J. Williams, J. Lelieveld

Research output: Chapter in Book/Report/Conference proceedingConference paperAcademic

Abstract

Here, the mechanism behind the collapse of turbulence in the evening is investigated as a precursor to the onset of the very stable boundary layer. We study how the atmospheric boundary layer dynamics impact atmospheric chemistry, guided and constrained by observations taken above the boreal forest during the HUMPPA-COPEC-2010 campaign. Based on the vertical profiles of potential temperature and specific moisture, obtained from 132 radio soundings, the vertical stratification is determined. Data is then classified according to different prototypes of the atmospheric boundary layer. By selecting a singular day that is characterized by a convective boundary layer and using a mixed layer model, the main dynamic contributions that influence atmospheric chemistry are determined. We will present how the evolution of the boundary layer height affects the concentrations of atmospheric chemical species. Our findings show the importance of an adequate knowledge of this evolution and, consequently, the need to account for large scale dynamical forcings (subsidence, advection) in order to represent atmospheric chemistry. Extra attention is directed at investigating the impact of temporal (morning) transitions and surface heterogeneity. More specifically, we investigate the impact of mixing with a residual layer aloft during the morning transition on atmospheric chemistry. Specific observed features in the time evolutions of the NOx and O3 concentrations, like morning concentration peaks, can be explained and represented by adequately incorporating the transition of the boundary layer dynamics from nocturnal to diurnal conditions. We complete the analysis by studying the effect of surface heterogeneity and the efficiency of turbulent mixing on the chemical reactivity using a Large Eddy Simulation model. We find that under heterogeneous surface forcings boundary layers become deeper, thereby affecting the dilution capacity of the boundary layer. We will also show that local instantaneous virtual vertical profiles of temperature and chemical species concentrations obtained from the Large Eddy Simulation model deviate more from area and time averaged profiles for heterogeneous surface conditions. In addition, the influence of non-uniform turbulent mixing on the chemical reactivity in the boundary layer is studied under homogeneous and heterogeneous surface conditions. We will present a sensitivity study how this effect, quantified by the intensity of segregation, depends on the surface (e.g., length scale of heterogeneity, differences in emissions) and dynamical conditions. We find that in order to represent atmospheric chemistry in a numerical model, dynamical and chemical effects should be resolved simultaneously.
Original languageEnglish
Title of host publication20th Symposium on Boundary Layers and Turbulence/18th Conference on Air-Sea Interaction, American Meteorological Society (9-13 July 2012, Boston, MA)
Place of PublicationBoston
PublisherAmerican Meteorological Society
Pages13B.4
Publication statusPublished - 2012
Event20th Symposium on Boundary Layers and Turbulence/18th Conference on Air-Sea Interaction - Boston, United States
Duration: 9 Jul 201213 Jul 2012

Conference

Conference20th Symposium on Boundary Layers and Turbulence/18th Conference on Air-Sea Interaction
CountryUnited States
CityBoston
Period9/07/1213/07/12

Fingerprint

atmospheric chemistry
boundary layer
turbulent mixing
large eddy simulation
vertical profile
convective boundary layer
potential temperature
boreal forest
mixed layer
advection
dilution
stratification
subsidence
turbulence
moisture
chemical
radio

Cite this

Ouwersloot, H. G., Vilà-Guerau de Arellano, J., Nölscher, A. C., Krol, M. C., Ganzeveld, L. N., Breitenberger, C., ... Lelieveld, J. (2012). The response of atmospheric chemistry to dynamical boundary layer processes associated to temporal transitions and surface heterogeneity. In 20th Symposium on Boundary Layers and Turbulence/18th Conference on Air-Sea Interaction, American Meteorological Society (9-13 July 2012, Boston, MA) (pp. 13B.4). Boston: American Meteorological Society.
Ouwersloot, H.G. ; Vilà-Guerau de Arellano, J. ; Nölscher, A.C. ; Krol, M.C. ; Ganzeveld, L.N. ; Breitenberger, C. ; Williams, J. ; Lelieveld, J. / The response of atmospheric chemistry to dynamical boundary layer processes associated to temporal transitions and surface heterogeneity. 20th Symposium on Boundary Layers and Turbulence/18th Conference on Air-Sea Interaction, American Meteorological Society (9-13 July 2012, Boston, MA). Boston : American Meteorological Society, 2012. pp. 13B.4
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abstract = "Here, the mechanism behind the collapse of turbulence in the evening is investigated as a precursor to the onset of the very stable boundary layer. We study how the atmospheric boundary layer dynamics impact atmospheric chemistry, guided and constrained by observations taken above the boreal forest during the HUMPPA-COPEC-2010 campaign. Based on the vertical profiles of potential temperature and specific moisture, obtained from 132 radio soundings, the vertical stratification is determined. Data is then classified according to different prototypes of the atmospheric boundary layer. By selecting a singular day that is characterized by a convective boundary layer and using a mixed layer model, the main dynamic contributions that influence atmospheric chemistry are determined. We will present how the evolution of the boundary layer height affects the concentrations of atmospheric chemical species. Our findings show the importance of an adequate knowledge of this evolution and, consequently, the need to account for large scale dynamical forcings (subsidence, advection) in order to represent atmospheric chemistry. Extra attention is directed at investigating the impact of temporal (morning) transitions and surface heterogeneity. More specifically, we investigate the impact of mixing with a residual layer aloft during the morning transition on atmospheric chemistry. Specific observed features in the time evolutions of the NOx and O3 concentrations, like morning concentration peaks, can be explained and represented by adequately incorporating the transition of the boundary layer dynamics from nocturnal to diurnal conditions. We complete the analysis by studying the effect of surface heterogeneity and the efficiency of turbulent mixing on the chemical reactivity using a Large Eddy Simulation model. We find that under heterogeneous surface forcings boundary layers become deeper, thereby affecting the dilution capacity of the boundary layer. We will also show that local instantaneous virtual vertical profiles of temperature and chemical species concentrations obtained from the Large Eddy Simulation model deviate more from area and time averaged profiles for heterogeneous surface conditions. In addition, the influence of non-uniform turbulent mixing on the chemical reactivity in the boundary layer is studied under homogeneous and heterogeneous surface conditions. We will present a sensitivity study how this effect, quantified by the intensity of segregation, depends on the surface (e.g., length scale of heterogeneity, differences in emissions) and dynamical conditions. We find that in order to represent atmospheric chemistry in a numerical model, dynamical and chemical effects should be resolved simultaneously.",
author = "H.G. Ouwersloot and {Vil{\`a}-Guerau de Arellano}, J. and A.C. N{\"o}lscher and M.C. Krol and L.N. Ganzeveld and C. Breitenberger and J. Williams and J. Lelieveld",
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Ouwersloot, HG, Vilà-Guerau de Arellano, J, Nölscher, AC, Krol, MC, Ganzeveld, LN, Breitenberger, C, Williams, J & Lelieveld, J 2012, The response of atmospheric chemistry to dynamical boundary layer processes associated to temporal transitions and surface heterogeneity. in 20th Symposium on Boundary Layers and Turbulence/18th Conference on Air-Sea Interaction, American Meteorological Society (9-13 July 2012, Boston, MA). American Meteorological Society, Boston, pp. 13B.4, 20th Symposium on Boundary Layers and Turbulence/18th Conference on Air-Sea Interaction, Boston, United States, 9/07/12.

The response of atmospheric chemistry to dynamical boundary layer processes associated to temporal transitions and surface heterogeneity. / Ouwersloot, H.G.; Vilà-Guerau de Arellano, J.; Nölscher, A.C.; Krol, M.C.; Ganzeveld, L.N.; Breitenberger, C.; Williams, J.; Lelieveld, J.

20th Symposium on Boundary Layers and Turbulence/18th Conference on Air-Sea Interaction, American Meteorological Society (9-13 July 2012, Boston, MA). Boston : American Meteorological Society, 2012. p. 13B.4.

Research output: Chapter in Book/Report/Conference proceedingConference paperAcademic

TY - GEN

T1 - The response of atmospheric chemistry to dynamical boundary layer processes associated to temporal transitions and surface heterogeneity

AU - Ouwersloot, H.G.

AU - Vilà-Guerau de Arellano, J.

AU - Nölscher, A.C.

AU - Krol, M.C.

AU - Ganzeveld, L.N.

AU - Breitenberger, C.

AU - Williams, J.

AU - Lelieveld, J.

N1 - recorded presentation: https://ams.confex.com/ams/20BLT18AirSea/flvgateway.cgi/id/21849?recordingid=21849

PY - 2012

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N2 - Here, the mechanism behind the collapse of turbulence in the evening is investigated as a precursor to the onset of the very stable boundary layer. We study how the atmospheric boundary layer dynamics impact atmospheric chemistry, guided and constrained by observations taken above the boreal forest during the HUMPPA-COPEC-2010 campaign. Based on the vertical profiles of potential temperature and specific moisture, obtained from 132 radio soundings, the vertical stratification is determined. Data is then classified according to different prototypes of the atmospheric boundary layer. By selecting a singular day that is characterized by a convective boundary layer and using a mixed layer model, the main dynamic contributions that influence atmospheric chemistry are determined. We will present how the evolution of the boundary layer height affects the concentrations of atmospheric chemical species. Our findings show the importance of an adequate knowledge of this evolution and, consequently, the need to account for large scale dynamical forcings (subsidence, advection) in order to represent atmospheric chemistry. Extra attention is directed at investigating the impact of temporal (morning) transitions and surface heterogeneity. More specifically, we investigate the impact of mixing with a residual layer aloft during the morning transition on atmospheric chemistry. Specific observed features in the time evolutions of the NOx and O3 concentrations, like morning concentration peaks, can be explained and represented by adequately incorporating the transition of the boundary layer dynamics from nocturnal to diurnal conditions. We complete the analysis by studying the effect of surface heterogeneity and the efficiency of turbulent mixing on the chemical reactivity using a Large Eddy Simulation model. We find that under heterogeneous surface forcings boundary layers become deeper, thereby affecting the dilution capacity of the boundary layer. We will also show that local instantaneous virtual vertical profiles of temperature and chemical species concentrations obtained from the Large Eddy Simulation model deviate more from area and time averaged profiles for heterogeneous surface conditions. In addition, the influence of non-uniform turbulent mixing on the chemical reactivity in the boundary layer is studied under homogeneous and heterogeneous surface conditions. We will present a sensitivity study how this effect, quantified by the intensity of segregation, depends on the surface (e.g., length scale of heterogeneity, differences in emissions) and dynamical conditions. We find that in order to represent atmospheric chemistry in a numerical model, dynamical and chemical effects should be resolved simultaneously.

AB - Here, the mechanism behind the collapse of turbulence in the evening is investigated as a precursor to the onset of the very stable boundary layer. We study how the atmospheric boundary layer dynamics impact atmospheric chemistry, guided and constrained by observations taken above the boreal forest during the HUMPPA-COPEC-2010 campaign. Based on the vertical profiles of potential temperature and specific moisture, obtained from 132 radio soundings, the vertical stratification is determined. Data is then classified according to different prototypes of the atmospheric boundary layer. By selecting a singular day that is characterized by a convective boundary layer and using a mixed layer model, the main dynamic contributions that influence atmospheric chemistry are determined. We will present how the evolution of the boundary layer height affects the concentrations of atmospheric chemical species. Our findings show the importance of an adequate knowledge of this evolution and, consequently, the need to account for large scale dynamical forcings (subsidence, advection) in order to represent atmospheric chemistry. Extra attention is directed at investigating the impact of temporal (morning) transitions and surface heterogeneity. More specifically, we investigate the impact of mixing with a residual layer aloft during the morning transition on atmospheric chemistry. Specific observed features in the time evolutions of the NOx and O3 concentrations, like morning concentration peaks, can be explained and represented by adequately incorporating the transition of the boundary layer dynamics from nocturnal to diurnal conditions. We complete the analysis by studying the effect of surface heterogeneity and the efficiency of turbulent mixing on the chemical reactivity using a Large Eddy Simulation model. We find that under heterogeneous surface forcings boundary layers become deeper, thereby affecting the dilution capacity of the boundary layer. We will also show that local instantaneous virtual vertical profiles of temperature and chemical species concentrations obtained from the Large Eddy Simulation model deviate more from area and time averaged profiles for heterogeneous surface conditions. In addition, the influence of non-uniform turbulent mixing on the chemical reactivity in the boundary layer is studied under homogeneous and heterogeneous surface conditions. We will present a sensitivity study how this effect, quantified by the intensity of segregation, depends on the surface (e.g., length scale of heterogeneity, differences in emissions) and dynamical conditions. We find that in order to represent atmospheric chemistry in a numerical model, dynamical and chemical effects should be resolved simultaneously.

M3 - Conference paper

SP - 13B.4

BT - 20th Symposium on Boundary Layers and Turbulence/18th Conference on Air-Sea Interaction, American Meteorological Society (9-13 July 2012, Boston, MA)

PB - American Meteorological Society

CY - Boston

ER -

Ouwersloot HG, Vilà-Guerau de Arellano J, Nölscher AC, Krol MC, Ganzeveld LN, Breitenberger C et al. The response of atmospheric chemistry to dynamical boundary layer processes associated to temporal transitions and surface heterogeneity. In 20th Symposium on Boundary Layers and Turbulence/18th Conference on Air-Sea Interaction, American Meteorological Society (9-13 July 2012, Boston, MA). Boston: American Meteorological Society. 2012. p. 13B.4