Submicrometer aerosols and excess CO as tracers for biomass burning air mass transport over southern Africa
This paper links surface measurements of biomass burning aerosols and trace gases with trajectory analysis to determine transport pathways for air masses with high and low concentrations. We interpret the long‐term atmospheric monitoring record from a remote monitoring station in central southern Af...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Mafusire, Getrude [verfasserIn] |
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| Format: |
Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2016 |
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| Rechteinformationen: |
Nutzungsrecht: © 2016. American Geophysical Union. All Rights Reserved. |
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| Schlagwörter: |
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| Übergeordnetes Werk: |
Enthalten in: Journal of geophysical research / D - Washington, DC : Union, 1984, 121(2016), 17 |
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| Übergeordnetes Werk: |
volume:121 ; year:2016 ; number:17 |
| Links: |
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| DOI / URN: |
10.1002/2015JD023965 |
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| 520 | |a This paper links surface measurements of biomass burning aerosols and trace gases with trajectory analysis to determine transport pathways for air masses with high and low concentrations. We interpret the long‐term atmospheric monitoring record from a remote monitoring station in central southern Africa (North West Province, South Africa). Trace gas analyzers and a Differential Mobility Particle Sizer were used to measure ground level trace gas and submicron aerosol concentrations. Fire signatures were identified based on excess CO above average tropospheric levels, and episodes of enhanced particulate matter concentrations in the 10 to 840 nm size range. Thirty‐six biomass burning plumes were reported; 7 had strong signals of excess CO, with ratios between 0.41 and 0.64, while 29 had weak signals ranging between 0.07 and 0.32. Pathways identified for the long‐range transport of biomass burning aerosols were as follows: easterly (39% frequency), southwesterly (31%), recirculation (22%), and northerly (8%) flow patterns. CO and Aitken‐mode aerosol number strengths were larger for fire emissions arriving in the easterly and southwesterly air masses than for recirculation and northerly air masses. Easterly and southwesterly flows were dominated by Aitken‐mode aerosol, whereas accumulation‐mode particles dominated in the recirculation and northerly flows. Findings identify biomass burning as a major source of Aitken‐mode aerosols. Enhanced CO concentrations, combined with Aitken‐ and accumulation‐mode particle number size distributions, are shown to provide a useful signature of plumes originating over regional biomass combustion events. Combined particle size distributions, CO, and particle number concentration time plots can be used to identify wildfire plumes Frequency of wildfire aerosol episodes at Botsalano was relatively infrequent Results justify the selection of Botsalano as a clean, remote continental location | ||
| 540 | |a Nutzungsrecht: © 2016. American Geophysical Union. All Rights Reserved. | ||
| 650 | 4 | |a biomass burning tracers | |
| 650 | 4 | |a excess CO | |
| 650 | 4 | |a submicrometer aerosols | |
| 650 | 4 | |a biomass burning | |
| 650 | 4 | |a air mass transport | |
| 650 | 4 | |a Southern Africa | |
| 650 | 4 | |a Biomass | |
| 650 | 4 | |a Airborne particulates | |
| 650 | 4 | |a Aerosols | |
| 700 | 1 | |a Annegarn, Harold John |4 oth | |
| 700 | 1 | |a Vakkari, Ville |4 oth | |
| 700 | 1 | |a Beukes, Johan Paul |4 oth | |
| 700 | 1 | |a Josipovic, Miroslav |4 oth | |
| 700 | 1 | |a Zyl, Pieter Gideon |4 oth | |
| 700 | 1 | |a Laakso, Lauri |4 oth | |
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10.1002/2015JD023965 doi PQ20161012 (DE-627)OLC1982700289 (DE-599)GBVOLC1982700289 (PRQ)p726-2864b834791c8f20c3838f99c43363012c824ac0a4a0ed5c4883bef20aaa90900 (KEY)0137985220160000121001700000submicrometeraerosolsandexcesscoastracersforbiomas DE-627 ger DE-627 rakwb eng 550 DNB Mafusire, Getrude verfasserin aut Submicrometer aerosols and excess CO as tracers for biomass burning air mass transport over southern Africa 2016 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier This paper links surface measurements of biomass burning aerosols and trace gases with trajectory analysis to determine transport pathways for air masses with high and low concentrations. We interpret the long‐term atmospheric monitoring record from a remote monitoring station in central southern Africa (North West Province, South Africa). Trace gas analyzers and a Differential Mobility Particle Sizer were used to measure ground level trace gas and submicron aerosol concentrations. Fire signatures were identified based on excess CO above average tropospheric levels, and episodes of enhanced particulate matter concentrations in the 10 to 840 nm size range. Thirty‐six biomass burning plumes were reported; 7 had strong signals of excess CO, with ratios between 0.41 and 0.64, while 29 had weak signals ranging between 0.07 and 0.32. Pathways identified for the long‐range transport of biomass burning aerosols were as follows: easterly (39% frequency), southwesterly (31%), recirculation (22%), and northerly (8%) flow patterns. CO and Aitken‐mode aerosol number strengths were larger for fire emissions arriving in the easterly and southwesterly air masses than for recirculation and northerly air masses. Easterly and southwesterly flows were dominated by Aitken‐mode aerosol, whereas accumulation‐mode particles dominated in the recirculation and northerly flows. Findings identify biomass burning as a major source of Aitken‐mode aerosols. Enhanced CO concentrations, combined with Aitken‐ and accumulation‐mode particle number size distributions, are shown to provide a useful signature of plumes originating over regional biomass combustion events. Combined particle size distributions, CO, and particle number concentration time plots can be used to identify wildfire plumes Frequency of wildfire aerosol episodes at Botsalano was relatively infrequent Results justify the selection of Botsalano as a clean, remote continental location Nutzungsrecht: © 2016. American Geophysical Union. All Rights Reserved. biomass burning tracers excess CO submicrometer aerosols biomass burning air mass transport Southern Africa Biomass Airborne particulates Aerosols Annegarn, Harold John oth Vakkari, Ville oth Beukes, Johan Paul oth Josipovic, Miroslav oth Zyl, Pieter Gideon oth Laakso, Lauri oth Enthalten in Journal of geophysical research / D Washington, DC : Union, 1984 121(2016), 17 (DE-627)130444391 (DE-600)710256-2 (DE-576)015978818 2169-897X nnns volume:121 year:2016 number:17 http://dx.doi.org/10.1002/2015JD023965 Volltext http://onlinelibrary.wiley.com/doi/10.1002/2015JD023965/abstract http://search.proquest.com/docview/1823075339 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_62 GBV_ILN_154 AR 121 2016 17 |
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10.1002/2015JD023965 doi PQ20161012 (DE-627)OLC1982700289 (DE-599)GBVOLC1982700289 (PRQ)p726-2864b834791c8f20c3838f99c43363012c824ac0a4a0ed5c4883bef20aaa90900 (KEY)0137985220160000121001700000submicrometeraerosolsandexcesscoastracersforbiomas DE-627 ger DE-627 rakwb eng 550 DNB Mafusire, Getrude verfasserin aut Submicrometer aerosols and excess CO as tracers for biomass burning air mass transport over southern Africa 2016 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier This paper links surface measurements of biomass burning aerosols and trace gases with trajectory analysis to determine transport pathways for air masses with high and low concentrations. We interpret the long‐term atmospheric monitoring record from a remote monitoring station in central southern Africa (North West Province, South Africa). Trace gas analyzers and a Differential Mobility Particle Sizer were used to measure ground level trace gas and submicron aerosol concentrations. Fire signatures were identified based on excess CO above average tropospheric levels, and episodes of enhanced particulate matter concentrations in the 10 to 840 nm size range. Thirty‐six biomass burning plumes were reported; 7 had strong signals of excess CO, with ratios between 0.41 and 0.64, while 29 had weak signals ranging between 0.07 and 0.32. Pathways identified for the long‐range transport of biomass burning aerosols were as follows: easterly (39% frequency), southwesterly (31%), recirculation (22%), and northerly (8%) flow patterns. CO and Aitken‐mode aerosol number strengths were larger for fire emissions arriving in the easterly and southwesterly air masses than for recirculation and northerly air masses. Easterly and southwesterly flows were dominated by Aitken‐mode aerosol, whereas accumulation‐mode particles dominated in the recirculation and northerly flows. Findings identify biomass burning as a major source of Aitken‐mode aerosols. Enhanced CO concentrations, combined with Aitken‐ and accumulation‐mode particle number size distributions, are shown to provide a useful signature of plumes originating over regional biomass combustion events. Combined particle size distributions, CO, and particle number concentration time plots can be used to identify wildfire plumes Frequency of wildfire aerosol episodes at Botsalano was relatively infrequent Results justify the selection of Botsalano as a clean, remote continental location Nutzungsrecht: © 2016. American Geophysical Union. All Rights Reserved. biomass burning tracers excess CO submicrometer aerosols biomass burning air mass transport Southern Africa Biomass Airborne particulates Aerosols Annegarn, Harold John oth Vakkari, Ville oth Beukes, Johan Paul oth Josipovic, Miroslav oth Zyl, Pieter Gideon oth Laakso, Lauri oth Enthalten in Journal of geophysical research / D Washington, DC : Union, 1984 121(2016), 17 (DE-627)130444391 (DE-600)710256-2 (DE-576)015978818 2169-897X nnns volume:121 year:2016 number:17 http://dx.doi.org/10.1002/2015JD023965 Volltext http://onlinelibrary.wiley.com/doi/10.1002/2015JD023965/abstract http://search.proquest.com/docview/1823075339 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_62 GBV_ILN_154 AR 121 2016 17 |
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10.1002/2015JD023965 doi PQ20161012 (DE-627)OLC1982700289 (DE-599)GBVOLC1982700289 (PRQ)p726-2864b834791c8f20c3838f99c43363012c824ac0a4a0ed5c4883bef20aaa90900 (KEY)0137985220160000121001700000submicrometeraerosolsandexcesscoastracersforbiomas DE-627 ger DE-627 rakwb eng 550 DNB Mafusire, Getrude verfasserin aut Submicrometer aerosols and excess CO as tracers for biomass burning air mass transport over southern Africa 2016 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier This paper links surface measurements of biomass burning aerosols and trace gases with trajectory analysis to determine transport pathways for air masses with high and low concentrations. We interpret the long‐term atmospheric monitoring record from a remote monitoring station in central southern Africa (North West Province, South Africa). Trace gas analyzers and a Differential Mobility Particle Sizer were used to measure ground level trace gas and submicron aerosol concentrations. Fire signatures were identified based on excess CO above average tropospheric levels, and episodes of enhanced particulate matter concentrations in the 10 to 840 nm size range. Thirty‐six biomass burning plumes were reported; 7 had strong signals of excess CO, with ratios between 0.41 and 0.64, while 29 had weak signals ranging between 0.07 and 0.32. Pathways identified for the long‐range transport of biomass burning aerosols were as follows: easterly (39% frequency), southwesterly (31%), recirculation (22%), and northerly (8%) flow patterns. CO and Aitken‐mode aerosol number strengths were larger for fire emissions arriving in the easterly and southwesterly air masses than for recirculation and northerly air masses. Easterly and southwesterly flows were dominated by Aitken‐mode aerosol, whereas accumulation‐mode particles dominated in the recirculation and northerly flows. Findings identify biomass burning as a major source of Aitken‐mode aerosols. Enhanced CO concentrations, combined with Aitken‐ and accumulation‐mode particle number size distributions, are shown to provide a useful signature of plumes originating over regional biomass combustion events. Combined particle size distributions, CO, and particle number concentration time plots can be used to identify wildfire plumes Frequency of wildfire aerosol episodes at Botsalano was relatively infrequent Results justify the selection of Botsalano as a clean, remote continental location Nutzungsrecht: © 2016. American Geophysical Union. All Rights Reserved. biomass burning tracers excess CO submicrometer aerosols biomass burning air mass transport Southern Africa Biomass Airborne particulates Aerosols Annegarn, Harold John oth Vakkari, Ville oth Beukes, Johan Paul oth Josipovic, Miroslav oth Zyl, Pieter Gideon oth Laakso, Lauri oth Enthalten in Journal of geophysical research / D Washington, DC : Union, 1984 121(2016), 17 (DE-627)130444391 (DE-600)710256-2 (DE-576)015978818 2169-897X nnns volume:121 year:2016 number:17 http://dx.doi.org/10.1002/2015JD023965 Volltext http://onlinelibrary.wiley.com/doi/10.1002/2015JD023965/abstract http://search.proquest.com/docview/1823075339 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_62 GBV_ILN_154 AR 121 2016 17 |
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10.1002/2015JD023965 doi PQ20161012 (DE-627)OLC1982700289 (DE-599)GBVOLC1982700289 (PRQ)p726-2864b834791c8f20c3838f99c43363012c824ac0a4a0ed5c4883bef20aaa90900 (KEY)0137985220160000121001700000submicrometeraerosolsandexcesscoastracersforbiomas DE-627 ger DE-627 rakwb eng 550 DNB Mafusire, Getrude verfasserin aut Submicrometer aerosols and excess CO as tracers for biomass burning air mass transport over southern Africa 2016 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier This paper links surface measurements of biomass burning aerosols and trace gases with trajectory analysis to determine transport pathways for air masses with high and low concentrations. We interpret the long‐term atmospheric monitoring record from a remote monitoring station in central southern Africa (North West Province, South Africa). Trace gas analyzers and a Differential Mobility Particle Sizer were used to measure ground level trace gas and submicron aerosol concentrations. Fire signatures were identified based on excess CO above average tropospheric levels, and episodes of enhanced particulate matter concentrations in the 10 to 840 nm size range. Thirty‐six biomass burning plumes were reported; 7 had strong signals of excess CO, with ratios between 0.41 and 0.64, while 29 had weak signals ranging between 0.07 and 0.32. Pathways identified for the long‐range transport of biomass burning aerosols were as follows: easterly (39% frequency), southwesterly (31%), recirculation (22%), and northerly (8%) flow patterns. CO and Aitken‐mode aerosol number strengths were larger for fire emissions arriving in the easterly and southwesterly air masses than for recirculation and northerly air masses. Easterly and southwesterly flows were dominated by Aitken‐mode aerosol, whereas accumulation‐mode particles dominated in the recirculation and northerly flows. Findings identify biomass burning as a major source of Aitken‐mode aerosols. Enhanced CO concentrations, combined with Aitken‐ and accumulation‐mode particle number size distributions, are shown to provide a useful signature of plumes originating over regional biomass combustion events. Combined particle size distributions, CO, and particle number concentration time plots can be used to identify wildfire plumes Frequency of wildfire aerosol episodes at Botsalano was relatively infrequent Results justify the selection of Botsalano as a clean, remote continental location Nutzungsrecht: © 2016. American Geophysical Union. All Rights Reserved. biomass burning tracers excess CO submicrometer aerosols biomass burning air mass transport Southern Africa Biomass Airborne particulates Aerosols Annegarn, Harold John oth Vakkari, Ville oth Beukes, Johan Paul oth Josipovic, Miroslav oth Zyl, Pieter Gideon oth Laakso, Lauri oth Enthalten in Journal of geophysical research / D Washington, DC : Union, 1984 121(2016), 17 (DE-627)130444391 (DE-600)710256-2 (DE-576)015978818 2169-897X nnns volume:121 year:2016 number:17 http://dx.doi.org/10.1002/2015JD023965 Volltext http://onlinelibrary.wiley.com/doi/10.1002/2015JD023965/abstract http://search.proquest.com/docview/1823075339 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_62 GBV_ILN_154 AR 121 2016 17 |
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10.1002/2015JD023965 doi PQ20161012 (DE-627)OLC1982700289 (DE-599)GBVOLC1982700289 (PRQ)p726-2864b834791c8f20c3838f99c43363012c824ac0a4a0ed5c4883bef20aaa90900 (KEY)0137985220160000121001700000submicrometeraerosolsandexcesscoastracersforbiomas DE-627 ger DE-627 rakwb eng 550 DNB Mafusire, Getrude verfasserin aut Submicrometer aerosols and excess CO as tracers for biomass burning air mass transport over southern Africa 2016 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier This paper links surface measurements of biomass burning aerosols and trace gases with trajectory analysis to determine transport pathways for air masses with high and low concentrations. We interpret the long‐term atmospheric monitoring record from a remote monitoring station in central southern Africa (North West Province, South Africa). Trace gas analyzers and a Differential Mobility Particle Sizer were used to measure ground level trace gas and submicron aerosol concentrations. Fire signatures were identified based on excess CO above average tropospheric levels, and episodes of enhanced particulate matter concentrations in the 10 to 840 nm size range. Thirty‐six biomass burning plumes were reported; 7 had strong signals of excess CO, with ratios between 0.41 and 0.64, while 29 had weak signals ranging between 0.07 and 0.32. Pathways identified for the long‐range transport of biomass burning aerosols were as follows: easterly (39% frequency), southwesterly (31%), recirculation (22%), and northerly (8%) flow patterns. CO and Aitken‐mode aerosol number strengths were larger for fire emissions arriving in the easterly and southwesterly air masses than for recirculation and northerly air masses. Easterly and southwesterly flows were dominated by Aitken‐mode aerosol, whereas accumulation‐mode particles dominated in the recirculation and northerly flows. Findings identify biomass burning as a major source of Aitken‐mode aerosols. Enhanced CO concentrations, combined with Aitken‐ and accumulation‐mode particle number size distributions, are shown to provide a useful signature of plumes originating over regional biomass combustion events. Combined particle size distributions, CO, and particle number concentration time plots can be used to identify wildfire plumes Frequency of wildfire aerosol episodes at Botsalano was relatively infrequent Results justify the selection of Botsalano as a clean, remote continental location Nutzungsrecht: © 2016. American Geophysical Union. All Rights Reserved. biomass burning tracers excess CO submicrometer aerosols biomass burning air mass transport Southern Africa Biomass Airborne particulates Aerosols Annegarn, Harold John oth Vakkari, Ville oth Beukes, Johan Paul oth Josipovic, Miroslav oth Zyl, Pieter Gideon oth Laakso, Lauri oth Enthalten in Journal of geophysical research / D Washington, DC : Union, 1984 121(2016), 17 (DE-627)130444391 (DE-600)710256-2 (DE-576)015978818 2169-897X nnns volume:121 year:2016 number:17 http://dx.doi.org/10.1002/2015JD023965 Volltext http://onlinelibrary.wiley.com/doi/10.1002/2015JD023965/abstract http://search.proquest.com/docview/1823075339 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_62 GBV_ILN_154 AR 121 2016 17 |
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Mafusire, Getrude @@aut@@ Annegarn, Harold John @@oth@@ Vakkari, Ville @@oth@@ Beukes, Johan Paul @@oth@@ Josipovic, Miroslav @@oth@@ Zyl, Pieter Gideon @@oth@@ Laakso, Lauri @@oth@@ |
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We interpret the long‐term atmospheric monitoring record from a remote monitoring station in central southern Africa (North West Province, South Africa). Trace gas analyzers and a Differential Mobility Particle Sizer were used to measure ground level trace gas and submicron aerosol concentrations. Fire signatures were identified based on excess CO above average tropospheric levels, and episodes of enhanced particulate matter concentrations in the 10 to 840 nm size range. Thirty‐six biomass burning plumes were reported; 7 had strong signals of excess CO, with ratios between 0.41 and 0.64, while 29 had weak signals ranging between 0.07 and 0.32. Pathways identified for the long‐range transport of biomass burning aerosols were as follows: easterly (39% frequency), southwesterly (31%), recirculation (22%), and northerly (8%) flow patterns. 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submicrometer aerosols and excess co as tracers for biomass burning air mass transport over southern africa |
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Submicrometer aerosols and excess CO as tracers for biomass burning air mass transport over southern Africa |
| abstract |
This paper links surface measurements of biomass burning aerosols and trace gases with trajectory analysis to determine transport pathways for air masses with high and low concentrations. We interpret the long‐term atmospheric monitoring record from a remote monitoring station in central southern Africa (North West Province, South Africa). Trace gas analyzers and a Differential Mobility Particle Sizer were used to measure ground level trace gas and submicron aerosol concentrations. Fire signatures were identified based on excess CO above average tropospheric levels, and episodes of enhanced particulate matter concentrations in the 10 to 840 nm size range. Thirty‐six biomass burning plumes were reported; 7 had strong signals of excess CO, with ratios between 0.41 and 0.64, while 29 had weak signals ranging between 0.07 and 0.32. Pathways identified for the long‐range transport of biomass burning aerosols were as follows: easterly (39% frequency), southwesterly (31%), recirculation (22%), and northerly (8%) flow patterns. CO and Aitken‐mode aerosol number strengths were larger for fire emissions arriving in the easterly and southwesterly air masses than for recirculation and northerly air masses. Easterly and southwesterly flows were dominated by Aitken‐mode aerosol, whereas accumulation‐mode particles dominated in the recirculation and northerly flows. Findings identify biomass burning as a major source of Aitken‐mode aerosols. Enhanced CO concentrations, combined with Aitken‐ and accumulation‐mode particle number size distributions, are shown to provide a useful signature of plumes originating over regional biomass combustion events. Combined particle size distributions, CO, and particle number concentration time plots can be used to identify wildfire plumes Frequency of wildfire aerosol episodes at Botsalano was relatively infrequent Results justify the selection of Botsalano as a clean, remote continental location |
| abstractGer |
This paper links surface measurements of biomass burning aerosols and trace gases with trajectory analysis to determine transport pathways for air masses with high and low concentrations. We interpret the long‐term atmospheric monitoring record from a remote monitoring station in central southern Africa (North West Province, South Africa). Trace gas analyzers and a Differential Mobility Particle Sizer were used to measure ground level trace gas and submicron aerosol concentrations. Fire signatures were identified based on excess CO above average tropospheric levels, and episodes of enhanced particulate matter concentrations in the 10 to 840 nm size range. Thirty‐six biomass burning plumes were reported; 7 had strong signals of excess CO, with ratios between 0.41 and 0.64, while 29 had weak signals ranging between 0.07 and 0.32. Pathways identified for the long‐range transport of biomass burning aerosols were as follows: easterly (39% frequency), southwesterly (31%), recirculation (22%), and northerly (8%) flow patterns. CO and Aitken‐mode aerosol number strengths were larger for fire emissions arriving in the easterly and southwesterly air masses than for recirculation and northerly air masses. Easterly and southwesterly flows were dominated by Aitken‐mode aerosol, whereas accumulation‐mode particles dominated in the recirculation and northerly flows. Findings identify biomass burning as a major source of Aitken‐mode aerosols. Enhanced CO concentrations, combined with Aitken‐ and accumulation‐mode particle number size distributions, are shown to provide a useful signature of plumes originating over regional biomass combustion events. Combined particle size distributions, CO, and particle number concentration time plots can be used to identify wildfire plumes Frequency of wildfire aerosol episodes at Botsalano was relatively infrequent Results justify the selection of Botsalano as a clean, remote continental location |
| abstract_unstemmed |
This paper links surface measurements of biomass burning aerosols and trace gases with trajectory analysis to determine transport pathways for air masses with high and low concentrations. We interpret the long‐term atmospheric monitoring record from a remote monitoring station in central southern Africa (North West Province, South Africa). Trace gas analyzers and a Differential Mobility Particle Sizer were used to measure ground level trace gas and submicron aerosol concentrations. Fire signatures were identified based on excess CO above average tropospheric levels, and episodes of enhanced particulate matter concentrations in the 10 to 840 nm size range. Thirty‐six biomass burning plumes were reported; 7 had strong signals of excess CO, with ratios between 0.41 and 0.64, while 29 had weak signals ranging between 0.07 and 0.32. Pathways identified for the long‐range transport of biomass burning aerosols were as follows: easterly (39% frequency), southwesterly (31%), recirculation (22%), and northerly (8%) flow patterns. CO and Aitken‐mode aerosol number strengths were larger for fire emissions arriving in the easterly and southwesterly air masses than for recirculation and northerly air masses. Easterly and southwesterly flows were dominated by Aitken‐mode aerosol, whereas accumulation‐mode particles dominated in the recirculation and northerly flows. Findings identify biomass burning as a major source of Aitken‐mode aerosols. Enhanced CO concentrations, combined with Aitken‐ and accumulation‐mode particle number size distributions, are shown to provide a useful signature of plumes originating over regional biomass combustion events. Combined particle size distributions, CO, and particle number concentration time plots can be used to identify wildfire plumes Frequency of wildfire aerosol episodes at Botsalano was relatively infrequent Results justify the selection of Botsalano as a clean, remote continental location |
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Submicrometer aerosols and excess CO as tracers for biomass burning air mass transport over southern Africa |
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Annegarn, Harold John Vakkari, Ville Beukes, Johan Paul Josipovic, Miroslav Zyl, Pieter Gideon Laakso, Lauri |
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