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Title: Comparison of aerosol optical properties above clouds between POLDER and AeroCom models over the South East Atlantic Ocean during the fire season: POLDER/AeroCom Comparison Above Clouds

Aerosol properties above clouds have been retrieved over the South East Atlantic Ocean during the fire season 2006 using satellite observations from POLDER (Polarization and Directionality of Earth Reflectances). From June to October, POLDER has observed a mean Above-Cloud Aerosol Optical Thickness (ACAOT) of 0.28 and a mean Above-Clouds Single Scattering Albedo (ACSSA) of 0.87 at 550nm. These results have been used to evaluate the simulation of aerosols above clouds in 5 AeroCom (Aerosol Comparisons between Observations and Models) models (GOCART, HadGEM3, ECHAM5-HAM2, OsloCTM2 and SPRINTARS). Most models do not reproduce the observed large aerosol load episodes. The comparison highlights the importance of the injection height and the vertical transport parameterizations to simulate the large ACAOT observed by POLDER. Furthermore, some models overestimate the ACSSA. In accordance with recent recommendations of the black carbon refractive index, a higher prescription of the imaginary part allows a better comparison with POLDER’s ACSSA.
 [1] ;  [2] ;  [3] ;  [3] ;  [3] ;  [2] ;  [4] ;  [4] ;  [5] ;  [3] ;  [3] ;  [6]
  1. Laboratoire d'Optique Atmosphérique, Université Lille 1, Villeneuve d'Ascq France; Now at College of Engineering, Mathematics, and Physical Sciences, University of Exeter, Exeter UK
  2. Department of Meteorology, University of Reading, Reading UK
  3. Laboratoire d'Optique Atmosphérique, Université Lille 1, Villeneuve d'Ascq France
  4. Center for International Climate and Environmental Research - Oslo, Oslo Norway
  5. Research Institute for Applied Mechanics, Kyushu University, Fukuoka Japan
  6. Max Planck Institute for Meteorology, Hamburg Germany; Pacific Northwest National Laboratory, Richland Washington USA
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 0094-8276; KP1703020
DOE Contract Number:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Geophysical Research Letters; Journal Volume: 43; Journal Issue: 8
American Geophysical Union
Research Org:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org:
Country of Publication:
United States