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Impey, Gary; Mihele, C. M.; Anlauf, K. G.; Barrie, Leonard A.; Hastie, D. R.; Shepson, P. B.

doi:10.1023/a:1006264912394

Cited by 76 publications

(36 citation statements)

References 23 publications

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“…In the following step, BrO is formed in the reaction with O 3 and Br atoms from photolysis of Br 2 , or e.g. HOBr from the reaction of BrO with the HO 2 radical (Impey et al, 1999). Br may also react with organic compounds to form HBr and organic bromine compounds, all of which are suspected to be scavenged by Arctic aerosols (Mcconnell et al, 1992;Impey et al, 1997Impey et al, , 1999.…”

Section: Q T Nguyen Et Al: Source Apportionment Of Particles At Stmentioning

confidence: 99%

“…HOBr from the reaction of BrO with the HO 2 radical (Impey et al, 1999). Br may also react with organic compounds to form HBr and organic bromine compounds, all of which are suspected to be scavenged by Arctic aerosols (Mcconnell et al, 1992;Impey et al, 1997Impey et al, , 1999. Furthermore, Br 2 can recycle with or without O 3 (Impey et al, 1999;Simpson et al, 2007) and may photolyse to Br atoms which further deplete O 3 .…”

Section: Q T Nguyen Et Al: Source Apportionment Of Particles At Stmentioning

confidence: 99%

“…Br may also react with organic compounds to form HBr and organic bromine compounds, all of which are suspected to be scavenged by Arctic aerosols (Mcconnell et al, 1992;Impey et al, 1997Impey et al, , 1999. Furthermore, Br 2 can recycle with or without O 3 (Impey et al, 1999;Simpson et al, 2007) and may photolyse to Br atoms which further deplete O 3 . In addition to the Combustion source,Br is apportioned to Cu/Ni source (31 % PMF ; 0 % COPREM ) and virtually no other sources, though the Br has both natural sources, e.g.…”

Section: Q T Nguyen Et Al: Source Apportionment Of Particles At Stmentioning

confidence: 99%

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Source apportionment of particles at Station Nord, North East Greenland during 2008–2010 using COPREM and PMF analysis

et al. 2013

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Abstract. In order to develop strategies for controlling and reducing Arctic air pollution, there is a need to understand the basic mechanisms for determining the fate of air pollution in the Arctic. Sources of atmospheric particles at Station Nord (81 • 36 N, 16 • 40 W) in North East Greenland were evaluated for a two-year period from March 2008 to February 2010. Source apportionment using Positive Matrix Factorization (PMF) and COnstrained Physical REceptor Model (COPREM) was based on measurements of black carbon, elements (Al, Si, S, K, Ca, Ti, V, Cr, Mn, Fe, Ni, Cu, Zn, Ga, As, Se, Br, Rb, Sr, Zr, Pb) and inorganic ions (SO 2 , SO 2− 4 , Na + , NH + 4 , NO − 3 , Cl − ). In general, source apportionment results by PMF and COPREM showed good agreement. Five sources adequately explained the measurements, which included a Marine and a Soil source of natural origin and three additional anthropogenic sources, which were all influenced by metal industries. One anthropogenic source was dominated by Zn of which air mass back trajectories using the Hybrid Single Particle Lagrangian Integrated Trajectory (HYS-PLIT) model suggested a Canadian Arctic origin, despite certain influences from Southern and Eastern origins. Another anthropogenic source was characterised by high concentrations of Pb and As, which has been historically referred to as a Combustion source at Station Nord. The impacts of largescale industry in Siberia, Russia were evident through high Cu concentrations in both the Combustion source and an additional Cu/Ni source.Br correlated well with the anthropogenic species S and Pb though the elements are unlikely to have a common origin. More likely, sulphuric acid aerosols serve as transport containers for Br species of marine origin. Of particular relevance to climate, sources of black carbon were identified to be mainly anthropogenic and most probably of Siberian origin (80-98 %).

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Section: Q T Nguyen Et Al: Source Apportionment Of Particles At Stmentioning

confidence: 99%

Section: Q T Nguyen Et Al: Source Apportionment Of Particles At Stmentioning

confidence: 99%

Section: Q T Nguyen Et Al: Source Apportionment Of Particles At Stmentioning

confidence: 99%

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Source apportionment of particles at Station Nord, North East Greenland during 2008–2010 using COPREM and PMF analysis

et al. 2013

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“…[1][2][3][4][5][6][7] Molecular dynamics 8,9 and Monte Carlo 10 simulations on alkali halide solutions have shown that there is a propensity of the large anions to segregate to the water-air surface. Ex-situ atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS) have revealed Br -segregation in NaBr in NaBr/NaCl crystals grown from aqueous solutions.…”

Section: Introductionmentioning

confidence: 99%

Ion Segregation and Deliquescence of Alkali Halide Nanocrystals on SiO₂

et al. 2009

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The adsorption of water on alkali halide (KBr, KCl, KF, NaCl) nanocrystals on SiO 2and their deliquescence was investigated as a function of relative humidity (RH) from 8%to near saturation by scanning polarization force microscopy. At low humidity water adsorption solvates ions at the surface of the crystals and increases their mobility. This results in a large increase in the dielectric constant, which is manifested in an increase in the electrostatic force and in an increase in the apparent height of the nanocrystals. Above 58% RH the diffusion of ions leads to Ostwald ripening, where larger nanocrystals grow at the expense of the smaller ones. At the deliquescence point droplets were formed. For KBr, KCl and NaCl, the droplets exhibit a negative surface potential relative to the surrounding region, indicative of the preferential segregation of anions to the air-solution interface.

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“…22 Non-HCl inorganic gaseous chlorine compounds, hypothesized to be mainly Cl 2 ranging from 13 to 127 ppt were measured indirectly using mist chambers at coastal sites. 23,24 Photolyzable chlorine compounds [25][26][27] have also been identified in the Arctic during surface ozone depletion in the spring. Such photolytically labile chlorine compounds will be photolyzed at sunrise and generate chlorine atoms.…”

Section: Introductionmentioning

confidence: 99%

Rate constants for the reactions of chlorine atoms with a series of unsaturated aldehydes and ketones at 298 K: structure and reactivity

Wang

Ezell

et al. 2002

Phys. Chem. Chem. Phys.

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Cited by 76 publications

References 23 publications

Source apportionment of particles at Station Nord, North East Greenland during 2008–2010 using COPREM and PMF analysis

Source apportionment of particles at Station Nord, North East Greenland during 2008–2010 using COPREM and PMF analysis

Ion Segregation and Deliquescence of Alkali Halide Nanocrystals on SiO₂

Rate constants for the reactions of chlorine atoms with a series of unsaturated aldehydes and ketones at 298 K: structure and reactivity

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Untitled

Cited by 76 publications

References 23 publications

Source apportionment of particles at Station Nord, North East Greenland during 2008–2010 using COPREM and PMF analysis

Source apportionment of particles at Station Nord, North East Greenland during 2008–2010 using COPREM and PMF analysis

Ion Segregation and Deliquescence of Alkali Halide Nanocrystals on SiO2

Rate constants for the reactions of chlorine atoms with a series of unsaturated aldehydes and ketones at 298 K: structure and reactivity

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Ion Segregation and Deliquescence of Alkali Halide Nanocrystals on SiO₂