Dr. Parrish works at the Chemical Sciences Division of the Earth System Research Laboratory of the U.S. National Oceanic and Atmospheric Administration (NOAA-ESRL). His expertise is in atmospheric chemistry and his research has focused on both regional and hemisphere-wide air quality and climate change issues associated with the chemical composition of the atmosphere. This work has led him to coordinate two highly successful IGAC Tasks on Intercontinental Transport and Chemical Transformation: ITCT-2K2 and ITCT-Lagrangian-2K4.

ISI Thompson Scientific lists Dr. Parrish as a "highly cited researcher" in the Geosciences.

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