Environmental Science Division (EVS)a Division of Argonne National Laboratory

Variability and Drivers of Aerosol Particle Characteristics and New Particle Formation from In Situ and Remote Sensing Measurements and Numerical Simulations

Tuesday, July 25, 2017

Ryan Sullivan, PhD Candidate
Department of Earth and Atmospheric Science
Cornell University
Tuesday, July 25, 2017
11:00 A.M. to 12:00 P.M.
Argonne National Laboratory
TCS Building 240
Room 4301

Aerosol-climate interactions are the leading uncertainty in understanding anthropogenic climate forcing, and aerosol particles negatively impact human and ecosystem health. First, ground- and satellite-based remote sensing measurements are used to quantify the spatiotemporal coherence of mean and extreme aerosol properties, and identify the drivers of the observed aerosol variability.

This analysis is extended to quantify the spatiotemporal coherence of aerosol precursors and species associated with new particle formation (NPF), develop a proxy using satellite-based measurements of aerosol and precursor concentrations to predict and diagnose controls of occurrence and intensity of NPF at a forest site in Indiana, and apply the satellite-based proxy to five long-terms sites in N. America to examine spatiotemporal scales and variability of drivers of new particle formation.

Next, climate indicators are developed to track changes in aerosol optical properties using satellite-constrained reanalysis products, and applied to the U.S.A. to identify trends in characteristics of aerosol populations, and attribute these changes to changes in natural and anthropogenic emissions, and meteorological conditions. Finally, the WRF-Chem model is modified to simulate NPF and run simulations at cloud-resolving resolution to quantify the impact of NPF on indirect aerosol forcing (i.e. changes in cloud brightness and lifetimes).

Ryan Sullivan
Ryan Sullivan
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portrait of V. Rao Kotamarthi