Increased Air Pollution over the Chesapeake Bay and its Effect on Deposition to the Bay

Dan Goldberg1, Christopher Loughner2, Maria Tzortziou3, Tim Canty4, Tim Vinciguerra5, Ken Pickering6, Xinrong Ren7 and Russell Dickerson8

NASA’s DISCOVER-AQ air quality campaign observed total reactive nitrogen among other trace gas constituents in the Baltimore-Washington region during the summer of 2011. In conjunction, a NOAA research vessel observed ozone and reactive nitrogen during a 10-day experiment over the Chesapeake Bay. Ozone and reactive nitrogen observations over the bay during the afternoon are often 10% - 20% higher than the closest upwind ground sites. We suggest that a combination of complex boundary layer dynamics, deposition rates, and unaccounted marine emissions are playing an integral role in the regional maximum of ozone and its precursors over the Chesapeake Bay. We use an air quality prediction model to quantify the total deposition of reactive nitrogen. Models show ozone and nitric acid are being trapped in a convergence zone along the bay shore leading to increased deposition to the bay. We will compare this with observations of deposition from the NADP monitoring sites along the Chesapeake Bay. 


1University of Maryland,
2ESSIC/University of Maryland,
3ESSIC/University of Maryland,
4University of Maryland,
5University of Maryland,
6NASA Goddard,
7NOAA/University of Maryland,
8University of Maryland,