Simulation of the transport, vertical distribution, optical properties and radiative impact of smoke aerosols with the ALADIN regional climate model during the ORACLES-2016 and LASIC experiments

Marc Mallet, Pierre Nabat, Paquita Zuidema, Jens Redemann, Andrew Mark Sayer, Martin Stengel, Sebastian Schmidt, Sabrina Cochrane, Sharon Burton, Richard Ferrare, Kerry Meyer, Pablo Saide, Hiren Jethva, Omar Torres, Robert Wood, David Saint Martin, Romain Roehrig, Christina Hsu, Paola Formenti

Research output: Contribution to journalArticle

Abstract

Estimates of the direct radiative effect (DRE) from absorbing smoke aerosols over the southeast Atlantic Ocean (SAO) require simulation of the microphysical and optical properties of stratocumulus clouds as well as of the altitude and shortwave (SW) optical properties of biomass burning aerosols (BBAs). In this study, we take advantage of the large number of observations acquired during the ObseRvations of Aerosols above Clouds and their intEractionS (ORACLES-2016) and Layered Atlantic Smoke Interactions with Clouds (LASIC) projects during September 2016 and compare them with datasets from the ALADIN-Climate (Aire Limitée Adaptation dynamique Développement InterNational) regional model. The model provides a good representation of the liquid water path but the low cloud fraction is underestimated compared to satellite data. The modeled total-column smoke aerosol optical depth (AOD) and above-cloud AOD are consistent (ĝ1/40.7< over continental sources and ĝ1/40.3< over the SAO at 550nm) with the Modern-Era Retrospective analysis for Research and Applications version 2 (MERRA-2), Ozone Monitoring Instrument (OMI) or Moderate Resolution Imaging Spectroradiometer (MODIS) data. The simulations indicate smoke transport over the SAO occurs mainly between 2 and 4km, consistent with surface and aircraft lidar observations. The BBA single scattering albedo is slightly overestimated compared to the Aerosol Robotic Network (AERONET) and more significantly when compared to Ascension Island surface observations. The difference could be due to the absence of internal mixing treatment in the ALADIN-Climate model. The SSA overestimate leads to an underestimation of the simulated SW radiative heating compared to ORACLES data. ALADIN-Climate simulates a positive (monthly mean) SW DRE of about +6Wmĝ'2< over the SAO (20gS-10N and 10gW-20E) at the top of the atmosphere and in all-sky conditions. Over the<span idCombining double low line"page4964"/> continent, the presence of BBA is shown to significantly decrease the net surface SW flux, through direct and semi-direct effects, which is compensated by a decrease (monthly mean) in sensible heat fluxes (ĝ'25<&thinsp;W&thinsp;mĝ'2<) and surface land temperature (ĝ'1.5<&thinsp;ĝ<C) over Angola, Zambia and the Democratic Republic of the Congo, notably. The surface cooling and the lower tropospheric heating decrease the continental planetary boundary layer height by about ĝ1/4200<&thinsp;m.

Original languageEnglish (US)
Pages (from-to)4963-4990
Number of pages28
JournalAtmospheric Chemistry and Physics
Volume19
Issue number7
DOIs
StatePublished - Apr 12 2019

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smoke
regional climate
optical property
vertical distribution
climate modeling
aerosol
simulation
biomass burning
experiment
optical depth
stratocumulus
volcanic cloud
sensible heat flux
satellite data
land surface
boundary layer
heating
cooling
liquid
climate

ASJC Scopus subject areas

  • Atmospheric Science

Cite this

Simulation of the transport, vertical distribution, optical properties and radiative impact of smoke aerosols with the ALADIN regional climate model during the ORACLES-2016 and LASIC experiments. / Mallet, Marc; Nabat, Pierre; Zuidema, Paquita; Redemann, Jens; Mark Sayer, Andrew; Stengel, Martin; Schmidt, Sebastian; Cochrane, Sabrina; Burton, Sharon; Ferrare, Richard; Meyer, Kerry; Saide, Pablo; Jethva, Hiren; Torres, Omar; Wood, Robert; Saint Martin, David; Roehrig, Romain; Hsu, Christina; Formenti, Paola.

In: Atmospheric Chemistry and Physics, Vol. 19, No. 7, 12.04.2019, p. 4963-4990.

Research output: Contribution to journalArticle

Mallet, M, Nabat, P, Zuidema, P, Redemann, J, Mark Sayer, A, Stengel, M, Schmidt, S, Cochrane, S, Burton, S, Ferrare, R, Meyer, K, Saide, P, Jethva, H, Torres, O, Wood, R, Saint Martin, D, Roehrig, R, Hsu, C & Formenti, P 2019, 'Simulation of the transport, vertical distribution, optical properties and radiative impact of smoke aerosols with the ALADIN regional climate model during the ORACLES-2016 and LASIC experiments', Atmospheric Chemistry and Physics, vol. 19, no. 7, pp. 4963-4990. https://doi.org/10.5194/acp-19-4963-2019
Mallet, Marc ; Nabat, Pierre ; Zuidema, Paquita ; Redemann, Jens ; Mark Sayer, Andrew ; Stengel, Martin ; Schmidt, Sebastian ; Cochrane, Sabrina ; Burton, Sharon ; Ferrare, Richard ; Meyer, Kerry ; Saide, Pablo ; Jethva, Hiren ; Torres, Omar ; Wood, Robert ; Saint Martin, David ; Roehrig, Romain ; Hsu, Christina ; Formenti, Paola. / Simulation of the transport, vertical distribution, optical properties and radiative impact of smoke aerosols with the ALADIN regional climate model during the ORACLES-2016 and LASIC experiments. In: Atmospheric Chemistry and Physics. 2019 ; Vol. 19, No. 7. pp. 4963-4990.
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abstract = "Estimates of the direct radiative effect (DRE) from absorbing smoke aerosols over the southeast Atlantic Ocean (SAO) require simulation of the microphysical and optical properties of stratocumulus clouds as well as of the altitude and shortwave (SW) optical properties of biomass burning aerosols (BBAs). In this study, we take advantage of the large number of observations acquired during the ObseRvations of Aerosols above Clouds and their intEractionS (ORACLES-2016) and Layered Atlantic Smoke Interactions with Clouds (LASIC) projects during September 2016 and compare them with datasets from the ALADIN-Climate (Aire Limit{\'e}e Adaptation dynamique D{\'e}veloppement InterNational) regional model. The model provides a good representation of the liquid water path but the low cloud fraction is underestimated compared to satellite data. The modeled total-column smoke aerosol optical depth (AOD) and above-cloud AOD are consistent (ĝ1/40.7< over continental sources and ĝ1/40.3< over the SAO at 550nm) with the Modern-Era Retrospective analysis for Research and Applications version 2 (MERRA-2), Ozone Monitoring Instrument (OMI) or Moderate Resolution Imaging Spectroradiometer (MODIS) data. The simulations indicate smoke transport over the SAO occurs mainly between 2 and 4km, consistent with surface and aircraft lidar observations. The BBA single scattering albedo is slightly overestimated compared to the Aerosol Robotic Network (AERONET) and more significantly when compared to Ascension Island surface observations. The difference could be due to the absence of internal mixing treatment in the ALADIN-Climate model. The SSA overestimate leads to an underestimation of the simulated SW radiative heating compared to ORACLES data. ALADIN-Climate simulates a positive (monthly mean) SW DRE of about +6Wmĝ'2< over the SAO (20gS-10N and 10gW-20E) at the top of the atmosphere and in all-sky conditions. Over the continent, the presence of BBA is shown to significantly decrease the net surface SW flux, through direct and semi-direct effects, which is compensated by a decrease (monthly mean) in sensible heat fluxes (ĝ'25<&thinsp;W&thinsp;mĝ'2<) and surface land temperature (ĝ'1.5<&thinsp;ĝ<C) over Angola, Zambia and the Democratic Republic of the Congo, notably. The surface cooling and the lower tropospheric heating decrease the continental planetary boundary layer height by about ĝ1/4200<&thinsp;m.",
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T1 - Simulation of the transport, vertical distribution, optical properties and radiative impact of smoke aerosols with the ALADIN regional climate model during the ORACLES-2016 and LASIC experiments

AU - Mallet, Marc

AU - Nabat, Pierre

AU - Zuidema, Paquita

AU - Redemann, Jens

AU - Mark Sayer, Andrew

AU - Stengel, Martin

AU - Schmidt, Sebastian

AU - Cochrane, Sabrina

AU - Burton, Sharon

AU - Ferrare, Richard

AU - Meyer, Kerry

AU - Saide, Pablo

AU - Jethva, Hiren

AU - Torres, Omar

AU - Wood, Robert

AU - Saint Martin, David

AU - Roehrig, Romain

AU - Hsu, Christina

AU - Formenti, Paola

PY - 2019/4/12

Y1 - 2019/4/12

N2 - Estimates of the direct radiative effect (DRE) from absorbing smoke aerosols over the southeast Atlantic Ocean (SAO) require simulation of the microphysical and optical properties of stratocumulus clouds as well as of the altitude and shortwave (SW) optical properties of biomass burning aerosols (BBAs). In this study, we take advantage of the large number of observations acquired during the ObseRvations of Aerosols above Clouds and their intEractionS (ORACLES-2016) and Layered Atlantic Smoke Interactions with Clouds (LASIC) projects during September 2016 and compare them with datasets from the ALADIN-Climate (Aire Limitée Adaptation dynamique Développement InterNational) regional model. The model provides a good representation of the liquid water path but the low cloud fraction is underestimated compared to satellite data. The modeled total-column smoke aerosol optical depth (AOD) and above-cloud AOD are consistent (ĝ1/40.7< over continental sources and ĝ1/40.3< over the SAO at 550nm) with the Modern-Era Retrospective analysis for Research and Applications version 2 (MERRA-2), Ozone Monitoring Instrument (OMI) or Moderate Resolution Imaging Spectroradiometer (MODIS) data. The simulations indicate smoke transport over the SAO occurs mainly between 2 and 4km, consistent with surface and aircraft lidar observations. The BBA single scattering albedo is slightly overestimated compared to the Aerosol Robotic Network (AERONET) and more significantly when compared to Ascension Island surface observations. The difference could be due to the absence of internal mixing treatment in the ALADIN-Climate model. The SSA overestimate leads to an underestimation of the simulated SW radiative heating compared to ORACLES data. ALADIN-Climate simulates a positive (monthly mean) SW DRE of about +6Wmĝ'2< over the SAO (20gS-10N and 10gW-20E) at the top of the atmosphere and in all-sky conditions. Over the continent, the presence of BBA is shown to significantly decrease the net surface SW flux, through direct and semi-direct effects, which is compensated by a decrease (monthly mean) in sensible heat fluxes (ĝ'25<&thinsp;W&thinsp;mĝ'2<) and surface land temperature (ĝ'1.5<&thinsp;ĝ<C) over Angola, Zambia and the Democratic Republic of the Congo, notably. The surface cooling and the lower tropospheric heating decrease the continental planetary boundary layer height by about ĝ1/4200<&thinsp;m.

AB - Estimates of the direct radiative effect (DRE) from absorbing smoke aerosols over the southeast Atlantic Ocean (SAO) require simulation of the microphysical and optical properties of stratocumulus clouds as well as of the altitude and shortwave (SW) optical properties of biomass burning aerosols (BBAs). In this study, we take advantage of the large number of observations acquired during the ObseRvations of Aerosols above Clouds and their intEractionS (ORACLES-2016) and Layered Atlantic Smoke Interactions with Clouds (LASIC) projects during September 2016 and compare them with datasets from the ALADIN-Climate (Aire Limitée Adaptation dynamique Développement InterNational) regional model. The model provides a good representation of the liquid water path but the low cloud fraction is underestimated compared to satellite data. The modeled total-column smoke aerosol optical depth (AOD) and above-cloud AOD are consistent (ĝ1/40.7< over continental sources and ĝ1/40.3< over the SAO at 550nm) with the Modern-Era Retrospective analysis for Research and Applications version 2 (MERRA-2), Ozone Monitoring Instrument (OMI) or Moderate Resolution Imaging Spectroradiometer (MODIS) data. The simulations indicate smoke transport over the SAO occurs mainly between 2 and 4km, consistent with surface and aircraft lidar observations. The BBA single scattering albedo is slightly overestimated compared to the Aerosol Robotic Network (AERONET) and more significantly when compared to Ascension Island surface observations. The difference could be due to the absence of internal mixing treatment in the ALADIN-Climate model. The SSA overestimate leads to an underestimation of the simulated SW radiative heating compared to ORACLES data. ALADIN-Climate simulates a positive (monthly mean) SW DRE of about +6Wmĝ'2< over the SAO (20gS-10N and 10gW-20E) at the top of the atmosphere and in all-sky conditions. Over the continent, the presence of BBA is shown to significantly decrease the net surface SW flux, through direct and semi-direct effects, which is compensated by a decrease (monthly mean) in sensible heat fluxes (ĝ'25<&thinsp;W&thinsp;mĝ'2<) and surface land temperature (ĝ'1.5<&thinsp;ĝ<C) over Angola, Zambia and the Democratic Republic of the Congo, notably. The surface cooling and the lower tropospheric heating decrease the continental planetary boundary layer height by about ĝ1/4200<&thinsp;m.

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