Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 5.414 IF 5.414
  • IF 5-year value: 5.958 IF 5-year
    5.958
  • CiteScore value: 9.7 CiteScore
    9.7
  • SNIP value: 1.517 SNIP 1.517
  • IPP value: 5.61 IPP 5.61
  • SJR value: 2.601 SJR 2.601
  • Scimago H <br class='hide-on-tablet hide-on-mobile'>index value: 191 Scimago H
    index 191
  • h5-index value: 89 h5-index 89
Preprints
https://doi.org/10.5194/acp-2020-317
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-317
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  18 May 2020

18 May 2020

Review status
This preprint is currently under review for the journal ACP.

Direct and semi-direct radiative forcing of biomass burning aerosols over the Southeast Atlantic (SEA) and its sensitivity to absorbing properties: a regional climate modeling study

Marc Mallet1, Fabien Solmon2, Pierre Nabat1, Nellie Elguindi2, Fabien Waquet3, Dominique Bouniol1, Andrew Mark Sayer4,5, Kerry Meyer5, Romain Roehrig1, Martine Michou1, Paquita Zuidema6, Cyrille Flamant7, Jens Redemann8, and Paola Formenti9 Marc Mallet et al.
  • 1Centre National de Recherches Météorologiques, UMR3589, Météo-France-CNRS, Toulouse, France
  • 2Laboratoire d'Aérologie, UMR 5560, 16 avenue Édouard Belin, 31400 Toulouse, France
  • 3Université de Lille, CNRS, UMR 8518, LOA – Laboratoire d'Optique Atmosphérique, 59000 Lille, France
  • 4Universities Spcae Reasearch Association Columbia, MD, USA
  • 5NASA Goddard Spade Flight Center, Greenbelt, MD, USA
  • 6Rosenstiel School of Marine and Atmospheric Sciences, University of Miami, Miami, FL, USA
  • 7LATMOS/IPSL, Sorbonne Université, UVSQ, CNRS, Paris, France
  • 8University of Oklahoma, Norman, Oklahoma, USA
  • 9LISA, UMR CNRS 7583, Université Paris Est Créteil et Université Paris Diderot, Institut Pierre Simon Laplace, Créteil, France

Abstract. Simulations are performed for the period 2000–2015 by two different regional climate models, ALADIN–Climat and RegCM, to quantify the direct and semi-direct radiative effects of biomass burning aerosols (BBA) in the Southeast Atlantic (SEA) region. The approach of using two different independent RCMs reinforces the robustness of the results. Different simulations have been performed using strongly absorbing BBA in accordance with recent in situ observations over the SEA. For the July–August–September (JAS) season, the single scattering albedo (SSA) and total aerosol optical depth (AOD) simulated by the ALADIN–Climat and RegCM models are consistent with the MACv2 climatology and MERRA-2 and CAMS-RA reanalyses near the biomass burning emission sources. However, the above-cloud AOD is slightly underestimated compared to satellite (MODIS and POLDER) data during the transport over the SEA. The direct radiative effect exerted at the continental and oceanic surfaces by BBA is significant in both models and the radiative effects at the top of the atmosphere indicate a remarkable regional contrast over SEA (in all-sky conditions), with a cooling (warming) north (south) of 10° S, which is in agreement with the recent MACv2 climatology. In addition, the two models indicate that BBA are responsible for an important shortwave radiative heating of ~ 0.5–1 K per day over SEA during JAS with maxima between 2 and 4 km above mean sea-level. At these altitudes, BBA increase air temperature by ~ 0.2–0.5 K, with the highest values being co-located with low stratocumulus clouds. Vertical changes in air temperature limit the subsidence over SEA creating a cyclonic anomaly. The opposite effect is simulated over the continent due to the increase in lower troposphere stability. The BBA semi-direct effect on the lower troposphere circulation is found to be consistent between the two models. Changes in the cloud fraction are moderate in response to the presence of smoke and the models differ over the Gulf of Guinea. Finally, the results indicate an important sensitivity of the direct and semi-direct effects to the absorbing properties of BBA.

Marc Mallet et al.

Interactive discussion

Status: open (until 09 Aug 2020)
Status: open (until 09 Aug 2020)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
[Subscribe to comment alert] Printer-friendly Version - Printer-friendly version Supplement - Supplement

Marc Mallet et al.

Marc Mallet et al.

Viewed

Total article views: 294 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
199 84 11 294 23 8 9
  • HTML: 199
  • PDF: 84
  • XML: 11
  • Total: 294
  • Supplement: 23
  • BibTeX: 8
  • EndNote: 9
Views and downloads (calculated since 18 May 2020)
Cumulative views and downloads (calculated since 18 May 2020)

Viewed (geographical distribution)

Total article views: 292 (including HTML, PDF, and XML) Thereof 292 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 

Cited

Saved

No saved metrics found.

Discussed

No discussed metrics found.
Latest update: 07 Aug 2020
Publications Copernicus
Download
Short summary
This paper presents numerical simulations using two regional climate models to study the impact of biomass fire plumes from Central Africa on the radiative balance of this region. The results indicate that biomass fire can either warm the regional climate when they are located above low clouds or cool it when they are located above land. They can also alter sea and land surface temperatures by decreasing solar radiation at the surface. Finally, they can also modify the atmospheric dynamic.
This paper presents numerical simulations using two regional climate models to study the impact...
Citation