Concentrations of polycyclic aromatic hydrocarbons
(PAHs) were measured in the coastal New Jersey atmosphere
as part of the New Jersey Atmospheric Deposition
Network (NJADN). PAH results from the first year of
atmospheric sampling (Oct 1997−Oct 1998) at a suburban
site near New Brunswick, NJ and a coastal site at
Sandy Hook, NJ are presented. PAHs (36) were analyzed
at both sites including phenanthrene and benzo[a]pyrene
whose concentrations ranged from 0.74 to 20.9 ng/m3
and 0.0020 to 0.62 ng/m3, respectively. PAH concentrations
at the suburban site were 2× higher than concentrations
measured at the coastal site, consistent with the closer
proximity of NB to urban/industrial regions than SH. The
seasonal trends of particulate PAH concentrations indicate
that PAH sources such as fuel consumption for domestic
heating and vehicular traffic drive their seasonal occur
rence. While gaseous concentrations of methylated
phenanthrenes and pyrene were higher during the winter
and similar to high molecular weight PAHs, phenanthrene
and fluoranthene show the opposite seasonal trend with
concentrations peaking in the summer months. Because
temperature accounted for less than 25% of the variability
in atmospheric concentrations, seasonal variability could
not be attributed to temperature-controlled air-surface
exchange. PAH concentrations in the New Jersey coastal
atmosphere indicate the importance of local and regional
sources originating from urban/industrial areas to the N, NE,
and to the SW.
Polycyclic aromatic hydrocarbons (PAHs, n = 36) were measured in the gas and particle phases in the atmosphere and the dissolved and particle phases in the waters of the New York-New Jersey Harbor Estuary, USA, during a weeklong intensive field campaign in July 1998. Mean total (gas + particulate) phenanthrene and pyrene concentrations were 3.3 and 0.33 ng/m3, respectively, over Raritan Bay, and 14 and 1.1 ng/ml, respectively, over New York Harbor. Similar PAH profiles (p values < 0.01) in the atmospheric gas phase and the dissolved phase in water demonstrate the close coupling of the air and water compartments. Air-water exchange fluxes of PAHs estimated using shore-based air data lead to erroneous flux estimates when compared to those derived using over-water air samples. The gross absorptive air-water flux dominates atmospheric loadings (wet, dry particle, gas absorption) to the estuary for PAHs of molecular weight < 234 g/mol. Dry particle deposition is increasingly more important for the higher-molecular-weight, particle-bound PAH species. Gross volatilization dominates gross absorption for the majority of PAHs in the New York-New Jersey Harbor Estuary.
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