Harvard University School of Engineering and Applied Sciences  Environmental Sciences and
Engineering (ESE) Program
Atmospheric Sciences Seminar
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Current Projects
 
  • Phase Transitions of
       Atmospheric Particles


     - Crystallization of SNAP
         Particles

     - 1×3TDMA
     - Atmospheric Nanoparticles
     - Modeling Aerosol Phase
        Transitions and Radiative
        Effects


  • Dissolution and
       Precipitation of Minerals
       in Aquatic Environments

     
  • Chemical Oxidation
       Reactions and Hydrophobic
       -to-Hydrophilic Aging of OAs


     - Aerodyne AMS analysis
     - CCN properties of OAs

  • Origins of Life:
       Mineral Surface Photo-
       Electrochemistry


  • Harvard Environmental Chamber

    AMAZE-08


    Closed Projects

      - Crystallization of Sulfate and
       Nitrate Coatings on
       Tropospheric Mineral Particles

     
      - Tropospheric Mineral
       Particles as Ice Nuclei

     
      - Building Structures at
       the Nanoscale



     

    Chemical Oxidation Reactions and Hydrophobic-to-Hydrophilic Aging of Atmospheric Organic Aerosol Particles

    We are investigating the reactivity of organic aerosol particles, particularly their conversion from hydrophobic to hydrophilic characteristics during processing by atmospheric oxidants such as ozone. Once hygroscopic, organic particles alter cloud properties (e.g., duration and brightness) by serving as the nuclei for water condensation. Quantification of these effects is limited, however, because the compositions, morphologies, and reactivities of organic particles are poorly understood. Laboratory studies are essential for understanding and quantifying complex particles and their chemical and physical processes. A key need is an elucidation of the chemical reactions between the organic particulate matter and gas-phase oxidants such as ozone. Our work is focused on ozone heterogeneous chemistry as a proxy for understanding the role of layer thickness in the chemical transformations of surface and interior layers of complex, multicomponent particles.

    AMS CCNC data

    We are grateful for NSF (ATM 0215357; ATM0513463) and Camille and Henry Dreyfus Foundation (EP-00-003) support.

     

    Publications

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