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Title: 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

Journal Article · · Atmospheric Chemistry and Physics (Online)
 [1];  [1]; ORCiD logo [2];  [3]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [6];  [6];  [7];  [7]; ORCiD logo [8]; ORCiD logo [9];  [4];  [8]; ORCiD logo [10]; ORCiD logo [1];  [1];  [8]; ORCiD logo [11]
  1. Centre National de Recherches Météorologiques, Toulouse (France)
  2. Univ. of Miami, Miami, FL (United States)
  3. Univ. of Oklahoma, Norman, OK (United States)
  4. Universities Space Research Association, Columbia, MD (United States); NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  5. Deutscher Wetterdienst (DWD), Offenbach (Germany)
  6. Univ. of Colorado, Boulder, CO (United States)
  7. NASA Langley Research Center, Hampton, VA (United States)
  8. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  9. Univ. of California, Los Angeles, CA (United States)
  10. Univ. of Washington, Seattle, WA (United States)
  11. Univ. Paris Est Créteil et Univ. Paris Diderot (France). , Inst. Pierre Simon Laplace

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 (~0.7 over continental sources and ~0.3 over the SAO at 550 nm) 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 4 km, 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 +6 W m-2 over the SAO (20° S–10° N and 10° W–20° E) 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 (-25 W m-2) and surface land temperature (-1.5 °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 ~200 m.

Research Organization:
Univ. of Miami, FL (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Atmospheric Radiation Measurement (ARM) Data Center
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Contributing Organization:
PNNL, BNL, ANL, ORNL
Grant/Contract Number:
SC0018272
OSTI ID:
1612906
Alternate ID(s):
OSTI ID: 1679949
Journal Information:
Atmospheric Chemistry and Physics (Online), Vol. 19, Issue 7; ISSN 1680-7324
Publisher:
European Geosciences UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 20 works
Citation information provided by
Web of Science

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dataset January 2021
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Cited By (3)

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 journal January 2020
Overview of aerosol optical properties over southern West Africa from DACCIWA aircraft measurements journal January 2020
Observations of supermicron-sized aerosols originating from biomass burning in southern Central Africa journal January 2021