Three years of measurements of light-absorbing aerosols over coastal Namibia: seasonality, origin, and transport
International audience 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 laye...
Published in: | Atmospheric Chemistry and Physics |
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Main Authors: | , , , , , , , , , , , , , , , , |
Other Authors: | , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2018
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Online Access: | https://hal.archives-ouvertes.fr/hal-02352581 https://hal.archives-ouvertes.fr/hal-02352581/document https://hal.archives-ouvertes.fr/hal-02352581/file/Formenti_Namibia_acp-18-17003-2018-includes-suppl.pdf https://doi.org/10.5194/acp-18-17003-2018 |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Formenti, Paola Piketh, Stuart John Namwoonde, Andreas Klopper, Danitza Burger, Roelof Cazaunau, Mathieu Féron, Anaïs Gaimoz, Cécile Broccardo, Stephen Walton, Nicola Desboeufs, Karine Siour, Guillaume Hanghome, Mattheus Mafwila, Samuel Omoregie, Edosa Junkermann, Wolfgang Maenhaut, Willy Three years of measurements of light-absorbing aerosols over coastal Namibia: seasonality, origin, and transport |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience 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 |
Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA (UMR_7583)) Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS) North-West University Potchefstroom (NWU) Namibia University of Science and Technology (NUST) Institut de Combustion, Aérothermique, Réactivité et Environnement (ICARE) Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut des Sciences de l'Ingénierie et des Systèmes (INSIS) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) Institute for Meteorology and Climate Research (IMK) Karlsruhe Institute of Technology (KIT) Universiteit Gent = Ghent University Belgium (UGENT) |
format |
Article in Journal/Newspaper |
author |
Formenti, Paola Piketh, Stuart John Namwoonde, Andreas Klopper, Danitza Burger, Roelof Cazaunau, Mathieu Féron, Anaïs Gaimoz, Cécile Broccardo, Stephen Walton, Nicola Desboeufs, Karine Siour, Guillaume Hanghome, Mattheus Mafwila, Samuel Omoregie, Edosa Junkermann, Wolfgang Maenhaut, Willy |
author_facet |
Formenti, Paola Piketh, Stuart John Namwoonde, Andreas Klopper, Danitza Burger, Roelof Cazaunau, Mathieu Féron, Anaïs Gaimoz, Cécile Broccardo, Stephen Walton, Nicola Desboeufs, Karine Siour, Guillaume Hanghome, Mattheus Mafwila, Samuel Omoregie, Edosa Junkermann, Wolfgang Maenhaut, Willy |
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 |
HAL CCSD |
publishDate |
2018 |
url |
https://hal.archives-ouvertes.fr/hal-02352581 https://hal.archives-ouvertes.fr/hal-02352581/document https://hal.archives-ouvertes.fr/hal-02352581/file/Formenti_Namibia_acp-18-17003-2018-includes-suppl.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_source |
ISSN: 1680-7316 EISSN: 1680-7324 Atmospheric Chemistry and Physics https://hal.archives-ouvertes.fr/hal-02352581 Atmospheric Chemistry and Physics, European Geosciences Union, 2018, 18 (23), pp.17003-17016. ⟨10.5194/acp-18-17003-2018⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/acp-18-17003-2018 hal-02352581 https://hal.archives-ouvertes.fr/hal-02352581 https://hal.archives-ouvertes.fr/hal-02352581/document https://hal.archives-ouvertes.fr/hal-02352581/file/Formenti_Namibia_acp-18-17003-2018-includes-suppl.pdf doi:10.5194/acp-18-17003-2018 |
op_rights |
info:eu-repo/semantics/OpenAccess |
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 |
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spelling |
ftccsdartic:oai:HAL:hal-02352581v1 2023-05-15T18:21:10+02:00 Three years of measurements of light-absorbing aerosols over coastal Namibia: seasonality, origin, and transport Formenti, Paola Piketh, Stuart John Namwoonde, Andreas Klopper, Danitza Burger, Roelof Cazaunau, Mathieu Féron, Anaïs Gaimoz, Cécile Broccardo, Stephen Walton, Nicola Desboeufs, Karine Siour, Guillaume Hanghome, Mattheus Mafwila, Samuel Omoregie, Edosa Junkermann, Wolfgang Maenhaut, Willy Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA (UMR_7583)) Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS) North-West University Potchefstroom (NWU) Namibia University of Science and Technology (NUST) Institut de Combustion, Aérothermique, Réactivité et Environnement (ICARE) Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut des Sciences de l'Ingénierie et des Systèmes (INSIS) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) Institute for Meteorology and Climate Research (IMK) Karlsruhe Institute of Technology (KIT) Universiteit Gent = Ghent University Belgium (UGENT) 2018 https://hal.archives-ouvertes.fr/hal-02352581 https://hal.archives-ouvertes.fr/hal-02352581/document https://hal.archives-ouvertes.fr/hal-02352581/file/Formenti_Namibia_acp-18-17003-2018-includes-suppl.pdf https://doi.org/10.5194/acp-18-17003-2018 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/acp-18-17003-2018 hal-02352581 https://hal.archives-ouvertes.fr/hal-02352581 https://hal.archives-ouvertes.fr/hal-02352581/document https://hal.archives-ouvertes.fr/hal-02352581/file/Formenti_Namibia_acp-18-17003-2018-includes-suppl.pdf doi:10.5194/acp-18-17003-2018 info:eu-repo/semantics/OpenAccess ISSN: 1680-7316 EISSN: 1680-7324 Atmospheric Chemistry and Physics https://hal.archives-ouvertes.fr/hal-02352581 Atmospheric Chemistry and Physics, European Geosciences Union, 2018, 18 (23), pp.17003-17016. ⟨10.5194/acp-18-17003-2018⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2018 ftccsdartic https://doi.org/10.5194/acp-18-17003-2018 2021-12-19T01:42:01Z International audience 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 Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Austral Atmospheric Chemistry and Physics 18 23 17003 17016 |