A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Contribution of black carbon and desert dust to aerosol absorption in the atmosphere of the Eastern Arabian Peninsula
https://orcid.org/0000-0001-5210-9508
https://orcid.org/0000-0002-8131-2369
https://orcid.org/0000-0002-3925-3780
https://orcid.org/0000-0002-1955-6661
https://orcid.org/0000-0003-4109-3656
https://orcid.org/0000-0001-5333-5582
https://orcid.org/0000-0002-7572-149X
https://orcid.org/0000-0001-8584-3274
https://orcid.org/0000-0001-9180-6525
https://orcid.org/0000-0001-7192-716X
https://orcid.org/0000-0002-7233-1656
Abstract Discriminating the absorption coefficients of aerosol mineral dust and black carbon (BC) in different aerosol size fractions is a challenge because of BC's large mass absorption cross-section compared to dust. Ambient aerosol wavelength dependent absorption coefficients in supermicron and submicron size fractions were determined with a high time resolution. The measurements were performed simultaneously using identical systems at an urban and a regional background site in Qatar. At each site, measurements were taken by co-located Aethalometers, one with a virtual impactor (VI) and the other with a PM1 cyclone to respectively collect super-micron-enhanced and submicron fractions. The combined measurement of aerosol absorption and scattering coefficients enabled the particles to be classified based on their optical properties' wavelength dependence. The classification reveals the presence of BC internally/externally mixed with different aerosols. Helium ion microscopy images provided information concerning the extent of mineral dust in the submicron fraction. The determination of absorption coefficients during dust storms and non-dust periods was used to establish the absorption Ångström exponent for dust and BC. Non-parametric wind regression, potential source contribution function and back-trajectory analysis reveal major regional sources of desert dust associated with north-westerly winds and a minor local dust contribution. In contrast, major BC sources found locally were associated with south-westerly winds with a smaller contribution made by offshore emissions transported by north-easterly and easterly winds. The use of a pair of Aethalometers with VI and PM1 inlets separates contributions of BC and dust to the aerosol absorption coefficient.
Highlights The text discusses a study focused on discriminating between aerosol mineral dust and BC absorption coefficients in various aerosol size fractions. The key highlights from the text are as follows: Collocated sites measurements: Measurements were conducted simultaneously at both an urban and a regional background site in Qatar using identical systems. Collocated Aethalometers were used, one with a virtual impactor and the other with a PM1 cyclone, to collect supermicron-enhanced and submicron aerosol fractions, respectively. Classification based on Optical Properties: The combination of aerosol absorption and scattering coefficient measurements allowed for the classification of particles based on the wavelength dependence of their optical properties, revealing the presence of BC internal/external mixing with various aerosols. Mineral Dust Contribution: HIM images provided information about the contribution of mineral dust in the submicron aerosol fraction. Absorption coefficients were determined during both dust storms and non-dust periods to calculate AAE for dust and BC. Source apportionment: Back-trajectories, wind regression, and PSCF were used to identify major regional sources of desert dust associated with northwesterly winds and major local BC sources associated with southerly west winds, with some offshore emissions transported by northeasterly and easterly winds.
Contribution of black carbon and desert dust to aerosol absorption in the atmosphere of the Eastern Arabian Peninsula
https://orcid.org/0000-0001-5210-9508
https://orcid.org/0000-0002-8131-2369
https://orcid.org/0000-0002-3925-3780
https://orcid.org/0000-0002-1955-6661
https://orcid.org/0000-0003-4109-3656
https://orcid.org/0000-0001-5333-5582
https://orcid.org/0000-0002-7572-149X
https://orcid.org/0000-0001-8584-3274
https://orcid.org/0000-0001-9180-6525
https://orcid.org/0000-0001-7192-716X
https://orcid.org/0000-0002-7233-1656
Abstract Discriminating the absorption coefficients of aerosol mineral dust and black carbon (BC) in different aerosol size fractions is a challenge because of BC's large mass absorption cross-section compared to dust. Ambient aerosol wavelength dependent absorption coefficients in supermicron and submicron size fractions were determined with a high time resolution. The measurements were performed simultaneously using identical systems at an urban and a regional background site in Qatar. At each site, measurements were taken by co-located Aethalometers, one with a virtual impactor (VI) and the other with a PM1 cyclone to respectively collect super-micron-enhanced and submicron fractions. The combined measurement of aerosol absorption and scattering coefficients enabled the particles to be classified based on their optical properties' wavelength dependence. The classification reveals the presence of BC internally/externally mixed with different aerosols. Helium ion microscopy images provided information concerning the extent of mineral dust in the submicron fraction. The determination of absorption coefficients during dust storms and non-dust periods was used to establish the absorption Ångström exponent for dust and BC. Non-parametric wind regression, potential source contribution function and back-trajectory analysis reveal major regional sources of desert dust associated with north-westerly winds and a minor local dust contribution. In contrast, major BC sources found locally were associated with south-westerly winds with a smaller contribution made by offshore emissions transported by north-easterly and easterly winds. The use of a pair of Aethalometers with VI and PM1 inlets separates contributions of BC and dust to the aerosol absorption coefficient.
Highlights The text discusses a study focused on discriminating between aerosol mineral dust and BC absorption coefficients in various aerosol size fractions. The key highlights from the text are as follows: Collocated sites measurements: Measurements were conducted simultaneously at both an urban and a regional background site in Qatar using identical systems. Collocated Aethalometers were used, one with a virtual impactor and the other with a PM1 cyclone, to collect supermicron-enhanced and submicron aerosol fractions, respectively. Classification based on Optical Properties: The combination of aerosol absorption and scattering coefficient measurements allowed for the classification of particles based on the wavelength dependence of their optical properties, revealing the presence of BC internal/external mixing with various aerosols. Mineral Dust Contribution: HIM images provided information about the contribution of mineral dust in the submicron aerosol fraction. Absorption coefficients were determined during both dust storms and non-dust periods to calculate AAE for dust and BC. Source apportionment: Back-trajectories, wind regression, and PSCF were used to identify major regional sources of desert dust associated with northwesterly winds and major local BC sources associated with southerly west winds, with some offshore emissions transported by northeasterly and easterly winds.
Contribution of black carbon and desert dust to aerosol absorption in the atmosphere of the Eastern Arabian Peninsula
https://orcid.org/0000-0001-5210-9508
https://orcid.org/0000-0002-8131-2369
https://orcid.org/0000-0002-3925-3780
https://orcid.org/0000-0002-1955-6661
https://orcid.org/0000-0003-4109-3656
https://orcid.org/0000-0001-5333-5582
https://orcid.org/0000-0002-7572-149X
https://orcid.org/0000-0001-8584-3274
https://orcid.org/0000-0001-9180-6525
https://orcid.org/0000-0001-7192-716X
https://orcid.org/0000-0002-7233-1656
Abstract Discriminating the absorption coefficients of aerosol mineral dust and black carbon (BC) in different aerosol size fractions is a challenge because of BC's large mass absorption cross-section compared to dust. Ambient aerosol wavelength dependent absorption coefficients in supermicron and submicron size fractions were determined with a high time resolution. The measurements were performed simultaneously using identical systems at an urban and a regional background site in Qatar. At each site, measurements were taken by co-located Aethalometers, one with a virtual impactor (VI) and the other with a PM1 cyclone to respectively collect super-micron-enhanced and submicron fractions. The combined measurement of aerosol absorption and scattering coefficients enabled the particles to be classified based on their optical properties' wavelength dependence. The classification reveals the presence of BC internally/externally mixed with different aerosols. Helium ion microscopy images provided information concerning the extent of mineral dust in the submicron fraction. The determination of absorption coefficients during dust storms and non-dust periods was used to establish the absorption Ångström exponent for dust and BC. Non-parametric wind regression, potential source contribution function and back-trajectory analysis reveal major regional sources of desert dust associated with north-westerly winds and a minor local dust contribution. In contrast, major BC sources found locally were associated with south-westerly winds with a smaller contribution made by offshore emissions transported by north-easterly and easterly winds. The use of a pair of Aethalometers with VI and PM1 inlets separates contributions of BC and dust to the aerosol absorption coefficient.
Highlights The text discusses a study focused on discriminating between aerosol mineral dust and BC absorption coefficients in various aerosol size fractions. The key highlights from the text are as follows: Collocated sites measurements: Measurements were conducted simultaneously at both an urban and a regional background site in Qatar using identical systems. Collocated Aethalometers were used, one with a virtual impactor and the other with a PM1 cyclone, to collect supermicron-enhanced and submicron aerosol fractions, respectively. Classification based on Optical Properties: The combination of aerosol absorption and scattering coefficient measurements allowed for the classification of particles based on the wavelength dependence of their optical properties, revealing the presence of BC internal/external mixing with various aerosols. Mineral Dust Contribution: HIM images provided information about the contribution of mineral dust in the submicron aerosol fraction. Absorption coefficients were determined during both dust storms and non-dust periods to calculate AAE for dust and BC. Source apportionment: Back-trajectories, wind regression, and PSCF were used to identify major regional sources of desert dust associated with northwesterly winds and major local BC sources associated with southerly west winds, with some offshore emissions transported by northeasterly and easterly winds.
Contribution of black carbon and desert dust to aerosol absorption in the atmosphere of the Eastern Arabian Peninsula
Mahfouz, Mohamed M.K. (author) / Skok, Gregor (author) / Sciare, Jean (author) / Pikridas, Michael (author) / Alfarra, M. Rami (author) / Moosakutty, Shamjad (author) / Alfoldy, Balint (author) / Ivančič, Matic (author) / Rigler, Martin (author) / Gregorič, Asta (author)
Atmospheric Environment ; 324
2024-02-26
Article (Journal)
Electronic Resource
English
| British Library Conference Proceedings | 2005
Cities in the Arabian Peninsula: Introduction
| Taylor & Francis Verlag | 2014