Joint Session 29 Aerosol–Climate Interactions from Regional to Global Scale. Part II

Tuesday, 14 January 2020: 3:00 PM-4:00 PM
208 (Boston Convention and Exhibition Center)
Hosts: (Joint between the 12th Symposium on Aerosol - Cloud - Climate Interactions; and the 33rd Conference on Climate Variability and Change )
Cochairs:
Yuan Wang, California Institute of Technology, Pasadena, CA and Bin Guan, University of California, Los Angeles, Pasadena, CA

Atmospheric aerosols from natural or anthropogenic sources have profound impacts on Earth's radiation budget, hydrological cycle, as well as regional and global climate. Currently, the radiative forcing of aerosols in the climate system remains highly uncertain, representing the largest uncertainty in climate predictions. For the direct effect, aerosols scatter and absorb solar radiation. Light scattering by aerosols changes the radiative fluxes at the top-of-atmosphere (TOA), at the surface, and within the atmospheric column, while aerosol absorption modifies the atmospheric temperature structure, decreases the solar radiation at the surface, and lowers surface sensible and latent fluxes, suppressing convection and reducing cloud fraction. Also, aerosols indirectly impact climate by altering cloud development, lifetime, albedo, and precipitation efficiency. On the other hand, climate variabilities also affect aerosol cycle and lifetime by altering aerosol removal processes. Current treatments of aerosol-cloud-radiation interactions remain crude in climate models. This session aims to review the state of current understanding on aerosol-climate interaction, so we invite any paper on the related subjects.

Papers:
3:00 PM
J29.1A
The Impact of Boundary Layer and Free-Troposphere Aerosol Particles on Arctic Low-Level Clouds
Adele L Igel, Univ. of California, Davis, Davis, CA; and J. Sedlar, S. Tong, and L. Sterzinger

3:15 PM
J29.2
Synergistic Approach to Estimate Aerosol Direct Radiative Forcing from Active Satellite Observations
D. Henderson, Univ. of Wisconsin–Madison, Madison, WI; and T. S. L'Ecuyer, A. Matus, and T. Takemura
3:30 PM
J29.3
The Separate Influence of Anthropogenic Aerosols and Greenhouse Gases on Forced Changes in the Global Energy and Water Cycles
Damien Irving, Univ. of New South Wales, Sydney, Australia; and J. Church, J. Zika, and S. Wijffels
3:45 PM
J29.4
Background Conditions Influence the Estimated Cloud Radiative Effects of Anthropogenic Aerosol Emissions from Different Source Regions
Benjamin Grandey, Singapore-MIT Alliance of Research and Technology, Singapore, Singapore; and C. Wang
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