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Three years of measurements of light-absorbing aerosols over coastal Namibia : seasonality, origin, and transport

(2018) ATMOSPHERIC CHEMISTRY AND PHYSICS. 18(23). p.17003-17016
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Abstract
Continuous measurements between July 2012 and December 2015 at the Henties Bay Aerosol Observatory (HBAO; 22 degrees S, 14 degrees 05' E), Namibia, show that, during the austral wintertime, transport of light-absorbing black carbon aerosols occurs at low level into the marine boundary layer. The average of daily concentrations of equivalent black carbon (eBC) over the whole sampling period is 53 (+/- 55) ng m(-3). Peak values above 200 ng m(-3) and up to 800 ng m(-3) occur seasonally from May to August, ahead of the dry season peak of biomass burning in southern Africa (August to October). Analysis of 3-day air mass back-trajectories show that air masses from the South Atlantic Ocean south of Henties Bay are generally cleaner than air having originated over the ocean north of Henties Bay, influenced by the outflow of the major biomass burning plume, and from the continent, where wildfires occur. Additional episodic peak concentrations, even for oceanic transport, indicate that pollution from distant sources in South Africa and maritime traffic along the Atlantic ship tracks could be important. While we expect the direct radiative effect to be negligible, the indirect effect on the microphysical properties of the stratocumulus clouds and the deposition to the ocean could be significant and deserve further investigation, specifically ahead of the dry season.
Keywords
BLACK CARBON AEROSOL, ATTENUATION CROSS-SECTION, INITIATIVE SAFARI 2000, OPTICAL-PROPERTIES, SOUTHERN AFRICA, ABSORPTION-MEASUREMENTS, BOUNDARY-LAYER, MIXING STATE, AETHALOMETER, MASS

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Citation

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MLA
Formenti, Paola, et al. “Three Years of Measurements of Light-Absorbing Aerosols over Coastal Namibia : Seasonality, Origin, and Transport.” ATMOSPHERIC CHEMISTRY AND PHYSICS, vol. 18, no. 23, 2018, pp. 17003–16, doi:10.5194/acp-18-17003-2018.
APA
Formenti, P., Piketh, S. J., Namwoonde, A., Klopper, D., Burger, R., Cazaunau, M., … Maenhaut, W. (2018). Three years of measurements of light-absorbing aerosols over coastal Namibia : seasonality, origin, and transport. ATMOSPHERIC CHEMISTRY AND PHYSICS, 18(23), 17003–17016. https://doi.org/10.5194/acp-18-17003-2018
Chicago author-date
Formenti, Paola, Stuart John Piketh, Andreas Namwoonde, Danitza Klopper, Roelof Burger, Mathieu Cazaunau, Anais Feron, et al. 2018. “Three Years of Measurements of Light-Absorbing Aerosols over Coastal Namibia : Seasonality, Origin, and Transport.” ATMOSPHERIC CHEMISTRY AND PHYSICS 18 (23): 17003–16. https://doi.org/10.5194/acp-18-17003-2018.
Chicago author-date (all authors)
Formenti, Paola, Stuart John Piketh, Andreas Namwoonde, Danitza Klopper, Roelof Burger, Mathieu Cazaunau, Anais Feron, Cecile Gaimoz, Stephen Broccardo, Nicola Walton, Karine Desboeufs, Guillaume Siour, Mattheus Hanghome, Samuel Mafwila, Edosa Omoregie, Wolfgang Junkermann, and Willy Maenhaut. 2018. “Three Years of Measurements of Light-Absorbing Aerosols over Coastal Namibia : Seasonality, Origin, and Transport.” ATMOSPHERIC CHEMISTRY AND PHYSICS 18 (23): 17003–17016. doi:10.5194/acp-18-17003-2018.
Vancouver
1.
Formenti P, Piketh SJ, Namwoonde A, Klopper D, Burger R, Cazaunau M, et al. Three years of measurements of light-absorbing aerosols over coastal Namibia : seasonality, origin, and transport. ATMOSPHERIC CHEMISTRY AND PHYSICS. 2018;18(23):17003–16.
IEEE
[1]
P. Formenti et al., “Three years of measurements of light-absorbing aerosols over coastal Namibia : seasonality, origin, and transport,” ATMOSPHERIC CHEMISTRY AND PHYSICS, vol. 18, no. 23, pp. 17003–17016, 2018.
@article{8598072,
  abstract     = {{Continuous measurements between July 2012 and December 2015 at the Henties Bay Aerosol Observatory (HBAO; 22 degrees S, 14 degrees 05' E), Namibia, show that, during the austral wintertime, transport of light-absorbing black carbon aerosols occurs at low level into the marine boundary layer. The average of daily concentrations of equivalent black carbon (eBC) over the whole sampling period is 53 (+/- 55) ng m(-3). Peak values above 200 ng m(-3) and up to 800 ng m(-3) occur seasonally from May to August, ahead of the dry season peak of biomass burning in southern Africa (August to October). Analysis of 3-day air mass back-trajectories show that air masses from the South Atlantic Ocean south of Henties Bay are generally cleaner than air having originated over the ocean north of Henties Bay, influenced by the outflow of the major biomass burning plume, and from the continent, where wildfires occur. Additional episodic peak concentrations, even for oceanic transport, indicate that pollution from distant sources in South Africa and maritime traffic along the Atlantic ship tracks could be important. While we expect the direct radiative effect to be negligible, the indirect effect on the microphysical properties of the stratocumulus clouds and the deposition to the ocean could be significant and deserve further investigation, specifically ahead of the dry season.}},
  author       = {{Formenti, Paola and Piketh, Stuart John and Namwoonde, Andreas and Klopper, Danitza and Burger, Roelof and Cazaunau, Mathieu and Feron, Anais and Gaimoz, Cecile and Broccardo, Stephen and Walton, Nicola and Desboeufs, Karine and Siour, Guillaume and Hanghome, Mattheus and Mafwila, Samuel and Omoregie, Edosa and Junkermann, Wolfgang and Maenhaut, Willy}},
  issn         = {{1680-7316}},
  journal      = {{ATMOSPHERIC CHEMISTRY AND PHYSICS}},
  keywords     = {{BLACK CARBON AEROSOL,ATTENUATION CROSS-SECTION,INITIATIVE SAFARI 2000,OPTICAL-PROPERTIES,SOUTHERN AFRICA,ABSORPTION-MEASUREMENTS,BOUNDARY-LAYER,MIXING STATE,AETHALOMETER,MASS}},
  language     = {{eng}},
  number       = {{23}},
  pages        = {{17003--17016}},
  title        = {{Three years of measurements of light-absorbing aerosols over coastal Namibia : seasonality, origin, and transport}},
  url          = {{http://doi.org/10.5194/acp-18-17003-2018}},
  volume       = {{18}},
  year         = {{2018}},
}

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