Three years of measurements of light-absorbing aerosols over coastal Namibia: seasonality, origin, and transport
Continuous measurements between July 2012 and December 2015 at the Henties Bay Aerosol Observatory (HBAO; 22∘ S, 14∘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 c...
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Online Access: | http://hdl.handle.net/10394/31826 https://www.atmos-chem-phys.net/18/17003/2018/acp-18-17003-2018.pdf https://doi.org/10.5194/acp-18-17003-2018 |
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ftnorthwestuniv:oai:dspace.nwu.ac.za:10394/31826 2023-05-15T18:21:09+02:00 Three years of measurements of light-absorbing aerosols over coastal Namibia: seasonality, origin, and transport Formenti, Paola Piketh, Stuart John Klopper, Danitza Burger, Roelof Broccardo, Stephen Walton, Nicola 18002080 - Piketh, Stuart John 24062219 - Burger, Roelof Petrus 25743147 - Broccardo, Stephen Paul 22115390 - Klopper, Danitza 24078298 - Walton, Nicola M. 2018 http://hdl.handle.net/10394/31826 https://www.atmos-chem-phys.net/18/17003/2018/acp-18-17003-2018.pdf https://doi.org/10.5194/acp-18-17003-2018 en eng EGU Formenti, P. et al. 2018. Three years of measurements of light-absorbing aerosols over coastal Namibia: seasonality, origin, and transport. Atmospheric chemistry and physics, 18(23):17003-17016. [https://doi.org/10.5194/acp-18-17003-2018] 1680-7316 1680-7324 (Online) http://hdl.handle.net/10394/31826 https://www.atmos-chem-phys.net/18/17003/2018/acp-18-17003-2018.pdf https://doi.org/10.5194/acp-18-17003-2018 Article 2018 ftnorthwestuniv https://doi.org/10.5194/acp-18-17003-2018 2019-06-17T23:52:42Z Continuous measurements between July 2012 and December 2015 at the Henties Bay Aerosol Observatory (HBAO; 22∘ S, 14∘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 Article in Journal/Newspaper South Atlantic Ocean North-West University, South Africa: Boloka (NWU-IR) Austral Atmospheric Chemistry and Physics 18 23 17003 17016 |
institution |
Open Polar |
collection |
North-West University, South Africa: Boloka (NWU-IR) |
op_collection_id |
ftnorthwestuniv |
language |
English |
description |
Continuous measurements between July 2012 and December 2015 at the Henties Bay Aerosol Observatory (HBAO; 22∘ S, 14∘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 |
author2 |
18002080 - Piketh, Stuart John 24062219 - Burger, Roelof Petrus 25743147 - Broccardo, Stephen Paul 22115390 - Klopper, Danitza 24078298 - Walton, Nicola M. |
format |
Article in Journal/Newspaper |
author |
Formenti, Paola Piketh, Stuart John Klopper, Danitza Burger, Roelof Broccardo, Stephen Walton, Nicola |
spellingShingle |
Formenti, Paola Piketh, Stuart John Klopper, Danitza Burger, Roelof Broccardo, Stephen Walton, Nicola Three years of measurements of light-absorbing aerosols over coastal Namibia: seasonality, origin, and transport |
author_facet |
Formenti, Paola Piketh, Stuart John Klopper, Danitza Burger, Roelof Broccardo, Stephen Walton, Nicola |
author_sort |
Formenti, Paola |
title |
Three years of measurements of light-absorbing aerosols over coastal Namibia: seasonality, origin, and transport |
title_short |
Three years of measurements of light-absorbing aerosols over coastal Namibia: seasonality, origin, and transport |
title_full |
Three years of measurements of light-absorbing aerosols over coastal Namibia: seasonality, origin, and transport |
title_fullStr |
Three years of measurements of light-absorbing aerosols over coastal Namibia: seasonality, origin, and transport |
title_full_unstemmed |
Three years of measurements of light-absorbing aerosols over coastal Namibia: seasonality, origin, and transport |
title_sort |
three years of measurements of light-absorbing aerosols over coastal namibia: seasonality, origin, and transport |
publisher |
EGU |
publishDate |
2018 |
url |
http://hdl.handle.net/10394/31826 https://www.atmos-chem-phys.net/18/17003/2018/acp-18-17003-2018.pdf https://doi.org/10.5194/acp-18-17003-2018 |
geographic |
Austral |
geographic_facet |
Austral |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_relation |
Formenti, P. et al. 2018. Three years of measurements of light-absorbing aerosols over coastal Namibia: seasonality, origin, and transport. Atmospheric chemistry and physics, 18(23):17003-17016. [https://doi.org/10.5194/acp-18-17003-2018] 1680-7316 1680-7324 (Online) http://hdl.handle.net/10394/31826 https://www.atmos-chem-phys.net/18/17003/2018/acp-18-17003-2018.pdf https://doi.org/10.5194/acp-18-17003-2018 |
op_doi |
https://doi.org/10.5194/acp-18-17003-2018 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
18 |
container_issue |
23 |
container_start_page |
17003 |
op_container_end_page |
17016 |
_version_ |
1766200275138248704 |