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Volume 13, issue 8
Atmos. Chem. Phys., 13, 3899-3908, 2013
https://doi.org/10.5194/acp-13-3899-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: Observations and modeling of aerosol and cloud properties...

Atmos. Chem. Phys., 13, 3899-3908, 2013
https://doi.org/10.5194/acp-13-3899-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 16 Apr 2013

Research article | 16 Apr 2013

Multi-satellite aerosol observations in the vicinity of clouds

T. Várnai1,2, A. Marshak2, and W. Yang2,3 T. Várnai et al.
  • 1University of Maryland Baltimore County, Joint Center for Earth System Technology, Baltimore, MD, USA
  • 2NASA Goddard Space Flight Center, Climate and Radiation Laboratory, Greenbelt, MD, USA
  • 3Universities Space Research Association, Columbia, MD, USA

Abstract. Improved characterization of aerosol properties in the vicinity of clouds is important for better understanding two critical aspects of climate: aerosol–cloud interactions and the direct radiative effect of aerosols. Satellite measurements have provided important insights into aerosol properties near clouds, but also suggested that the observations can be affected by 3-D radiative processes and instrument blurring not considered in current data interpretation methods. This study examines systematic cloud-related changes in particle properties and radiation fields that influence satellite measurements of aerosols in the vicinity of low-level maritime clouds. For this, the paper presents a statistical analysis of a yearlong global dataset of co-located MODIS and CALIOP observations and theoretical simulations. The results reveal that CALIOP-observed aerosol particle size and optical thickness, and MODIS-observed solar reflectance increase systematically in a wide transition zone around clouds. It is estimated that near-cloud changes in particle populations – including both aerosols and undetected cloud particles – are responsible for roughly two thirds of the observed increase in 0.55 μm MODIS reflectance. The results also indicate that 3-D radiative processes significantly contribute to near-cloud reflectance enhancements, while instrument blurring contributes significantly only within 1 km from clouds and then quickly diminishes with distance from clouds.

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