Interactive comment on “Concentrati n-w ighted trajectory approach to identifying sources of Speciated Atmospheric Mercury at an Urban Coastal Site in Nova Scotia, Canada” by I. Cheng

Interactive comment on “Concentrati n-w ighted trajectory approach to identifying sources of Speciated Atmospheric Mercury at an Urban Coastal Site in Nova Scotia, Canada” by I. Cheng

Interactive comment on “Concentrati n-w ighted trajectory approach to identifying sources of Speciated Atmospheric Mercury at an Urban Coastal Site in Nova Scotia, Canada” by I. Cheng

Interactive comment on “Concentrati n-w ighted trajectory approach to identifying sources of Speciated Atmospheric Mercury at an Urban Coastal Site in Nova Scotia, Canada” by I. Cheng

Response: GEM is emitted from oceans due to evasion from the ocean surface. Oceans make up the largest natural source of Hg globally and includes primary emissions and emissions of previously-deposited Hg originating from natural and anthropogenic sources. GOM production over the ocean is also possible by in situ GEM oxidation involving oxidants, e.g. reactive Br (since the ocean is a major sou...

Interactive comment on “Concentration-weighted trajectory approach to identifying sources of Speciated Atmospheric Mercury at an Urban Coastal Site in Nova Scotia, Canada” by I. Cheng

This discussion paper is dedicated to the source apportionment of speciated mercury measured at an urban site at the Canadian east coast by means of backward trajectory modelling. Thus, it approaches several of the above mentioned scientific questions. First of all, long time measurements of speciated mercury are still relatively rare. As such these measurements are worth being published and wi...

Concentration-weighted trajectory approach to identifying potential sources of speciated atmospheric mercury at an urban coastal site in Nova Scotia, Canada

Regional and local sources contributing to gaseous elemental mercury (GEM), gaseous oxidized mercury (GOM), and particle-bound mercury (PBM) at an urban coastal site in Dartmouth, Nova Scotia, Canada were investigated using the Concentration-Weighted Trajectory model (CWT) and Conditional Probability Function. From 2010–2011, GEM, GOM, and PBM concentrations were 1.67± 1.01 ng m−3, 2.07± 3.35 p...