Specific marine boundary layer aerosol model

1992 ◽  
Author(s):  
Tom B. Low ◽  
Norman G. Loeb
Keyword(s):  
Boundary Layer ◽  
Marine Boundary Layer ◽  
Aerosol Model

scholarly journals Laboratory studies of the homogeneous nucleation of iodine oxides

2004 ◽  
Vol 4 (1) ◽  
pp. 19-34 ◽  
Author(s):  
J. B. Burkholder ◽  
J. Curtius ◽  
A. R. Ravishankara ◽  
E. R. Lovejoy
Keyword(s):  
Boundary Layer ◽  
Homogeneous Nucleation ◽  
Marine Boundary Layer ◽  
Coastal Region ◽  
Field Measurements ◽  
Experimental Results ◽  
Model Parameters ◽  
Model Calculations ◽  
Aerosol Model ◽  
Iodine Oxides

Abstract. Laboratory experimental results of iodine oxide nucleation are presented. Nucleation was induced following UV photolysis of CF3I or CH2I2 in the presence of excess ozone. Measurements were performed in a 70 L Teflon reactor with new particles detected using an Ultrafine Condensation Particle Counter, UCPC. The experimental results are interpreted using a coupled chemical - aerosol model to derive model parameters assuming single component homogeneous nucleation of OIO. The aerosol model results have been applied in an atmospheric box-model to interpret the possible implications of iodine oxide nucleation in the marine boundary layer. The model calculations demonstrate that IO and OIO concentrations reported in recent field measurements using long path absorption (Allan et al., 2000, 2001) are not sufficient to account for significant aerosol production either in the coastal or open ocean marine boundary layer using the mechanism presented. We demonstrate that inhomogeneous sources of iodine oxides, i.e. "hot" spots with elevated iodine species emissions, could account for the aerosol production bursts observed in the coastal region near Mace Head, Ireland.

scholarly journals Laboratory studies of the homogeneous nucleation of iodine oxides

2003 ◽  
Vol 3 (5) ◽  
pp. 4943-4988 ◽  
Author(s):  
J. B. Burkholder ◽  
J. Curtius ◽  
A. R. Ravishankara ◽  
E. R. Lovejoy
Keyword(s):  
Boundary Layer ◽  
Homogeneous Nucleation ◽  
Marine Boundary Layer ◽  
Coastal Region ◽  
Field Measurements ◽  
Experimental Results ◽  
Model Parameters ◽  
Model Calculations ◽  
Aerosol Model ◽  
Iodine Oxides

Abstract. Laboratory experimental results of iodine oxide nucleation are presented. Nucleation was induced following UV photolysis of CF3I or CH2I2 in the presence of excess ozone. Measurements were performed in a 70 L Teflon reactor with new particles detected using an Ultrafine Condensation Particle Counter, UCPC. The experimental results are interpreted using a coupled chemical – aerosol model to derive model parameters assuming single component homogeneous nucleation of OIO. The aerosol model results have been applied in an atmospheric box-model to interpret the possible implications of iodine oxide nucleation in the marine boundary layer. The model calculations demonstrate that IO and OIO concentrations reported in recent field measurements (Allan et al., 2000, 2001) are not sufficient to account for significant aerosol production either in the coastal or open ocean marine boundary layer using the mechanism presented. We demonstrate that inhomogeneous sources of iodine oxides, i.e. "hot" spots with elevated iodine species emissions, could account for the aerosol production bursts observed in the coastal region near Mace Head, Ireland.

scholarly journals Modelling multi-phase halogen chemistry in the coastal marine boundary layer: investigation of the relative importance of local chemistry vs. long-range transport

2011 ◽  
Vol 11 (3) ◽  
pp. 979-994 ◽  
Author(s):  
D. Lowe ◽  
J. Ryder ◽  
R. Leigh ◽  
J. R. Dorsey ◽  
G. McFiggans
Keyword(s):  
Boundary Layer ◽  
Marine Boundary Layer ◽  
Aerosol Model ◽  
North West ◽  
Coastal Marine ◽  
Separate Particle ◽  
Halogen Chemistry ◽  
Tidal Data ◽  
Coast Environment ◽  
Multi Phase

Abstract. Measurements of significant concentrations of IO, I2 and BrO in a semi-polluted coast environment at Roscoff, in North-West France, have been made as part of the Reactive Halogens in the Marine Boundary Layer (RHaMBLe) campaign undertaken in September 2006. We use a one-dimensional column model, with idealised I2 emissions predicted using macroalgael maps and tidal data from the littoral area surrounding Roscoff, to investigate the probable causes for these observations. The coupled microphysical and chemical aerosol model simulates mixed-phase halogen chemistry using two separate particle modes, seasalt and non-seasalt, each comprising of eight size-sections. This work confirms the finding of a previous study that the BrO measurements are most likely caused by unknown, local sources. We find that the remote observations of IO and I2 are best replicated using the I2 recycling mechanism suggested by previous studies, but that such a mechanism is not wholly necessary. However in-situ measurements of I2 can only be explained by invoking an I2 recycling mechanism. We suggest that focussed observations of the changes in NOx and NOy concentrations, as well as changes in the nitrate fraction of the non-seasalt aerosol mode, in the presence of I2 bursts could be used to determine the atmospheric relevance of the predicted I2 recycling mechanism.

scholarly journals Modelling multi-phase halogen chemistry in the coastal marine boundary layer: investigation of the relative importance of local chemistry vs. long-range transport

2010 ◽  
Vol 10 (8) ◽  
pp. 19429-19467
Author(s):  
D. Lowe ◽  
J. Ryder ◽  
R. Leigh ◽  
J. R. Dorsey ◽  
G. McFiggans
Keyword(s):  
Boundary Layer ◽  
Marine Boundary Layer ◽  
Aerosol Model ◽  
North West ◽  
Coastal Marine ◽  
Separate Particle ◽  
Halogen Chemistry ◽  
Tidal Data ◽  
Coast Environment ◽  
Multi Phase

Abstract. Measurements of significant concentrations of IO, I2 and BrO in a semi-polluted coast environment at Roscoff, in North-West France, have been made as part of the Reactive Halogens in the Marine Boundary Layer (RHaMBLe) campaign undertaken in September 2006. We use a one-dimensional column model, with idealised I2 emissions predicted using macroalgael maps and tidal data from the littoral area surrounding Roscoff, to investigate the probable causes for these observations. The coupled microphysical and chemical aerosol model simulates mixed-phase halogen chemistry using two separate particle modes, seasalt and non-seasalt, each comprising of eight size-sections. This work confirms the finding of a previous study that the BrO measurements are most likely caused by unknown, local sources. We find that the remote observations of IO and I2 are best replicated using the I2 recycling mechanism suggested by previous studies, but that such a mechanism is not wholly necessary. However we suggest that focussed observations of the changes in NOx and NOy concentrations, as well as changes in the nitrate fraction of the non-seasalt aerosol mode, in the presence of I2 bursts could be used to determine the atmospheric relevance of the predicted I2 recycling mechanism.

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