Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Processes controlling diurnal variations of PCDD/Fs in the New Jersey coastal atmosphere.
AU - Lohmann, Rainer
AU - Brunciak, Paul A.
AU - Dachs, Jordi
AU - Gigliotti, Cari L.
AU - Nelson, Eric
AU - Van Ry, Daryl
AU - Glenn, Thomas
AU - Eisenreich, Steven J.
AU - Jones, Joanne L
AU - Jones, Kevin C.
PY - 2003/3
Y1 - 2003/3
N2 - Consecutive 12 hour day–night air samples (500 m3 each) were taken over 7 days at three land-based sites and an over-water site in coastal New Jersey (NJ) in July 1998, in a campaign designed to shed light on factors controlling ambient PCDD/F concentrations. The sampling sites were chosen to reflect contrasting environments: urban/industrial from the center of the New York (NY)–NJ metropolitan area (Liberty Science Center, LSC); coastal Atlantic (Sandy Hook, SH); suburban NJ (New Brunswick, NB); over-water in Raritan Bay (RB). Despite proximity to the major NY/NJ conurbation, ambient PCDD/F concentrations in the region were low compared to literature data for other urban locations. Mean ∑Cl4–8DD/Fs and ∑TEQ (in fg/m3) were: 1400 and 16 at NB; 1000 and 9.5 over RB; 880 and 8.5 at LSC; and 830 and 6.6 at SH. Di- and tri-chlorinated dibenzo-p-dioxins and -furans (PCDD/Fs) were also measured and dominated the ∑Cl2–8DD/F concentrations. Air–water exchange calculations demonstrated the relative importance of Cl2–3DD volatilizing from the Lower Hudson River Estuary for ambient concentrations (25% of advection), but was of minor importance for the other PCDD/Fs. The study provides evidence that advective transport, local inputs and atmospheric processes combine in a complex manner to control ambient PCDD/F concentrations. These processes generally dominate any local diurnal influence of OH-radical-mediated depletion, which we had hypothesized would be detectable by measuring higher night- and day-time concentrations. Rather, it is implied that changes in the mixed boundary layer height resulted in higher night- than daytime concentrations at the urban and coastal sites. A strong diurnal signal, dominated by the lower chlorinated dioxins and furans, was detected at the rural site (NB) during a period of lower wind speeds.
AB - Consecutive 12 hour day–night air samples (500 m3 each) were taken over 7 days at three land-based sites and an over-water site in coastal New Jersey (NJ) in July 1998, in a campaign designed to shed light on factors controlling ambient PCDD/F concentrations. The sampling sites were chosen to reflect contrasting environments: urban/industrial from the center of the New York (NY)–NJ metropolitan area (Liberty Science Center, LSC); coastal Atlantic (Sandy Hook, SH); suburban NJ (New Brunswick, NB); over-water in Raritan Bay (RB). Despite proximity to the major NY/NJ conurbation, ambient PCDD/F concentrations in the region were low compared to literature data for other urban locations. Mean ∑Cl4–8DD/Fs and ∑TEQ (in fg/m3) were: 1400 and 16 at NB; 1000 and 9.5 over RB; 880 and 8.5 at LSC; and 830 and 6.6 at SH. Di- and tri-chlorinated dibenzo-p-dioxins and -furans (PCDD/Fs) were also measured and dominated the ∑Cl2–8DD/F concentrations. Air–water exchange calculations demonstrated the relative importance of Cl2–3DD volatilizing from the Lower Hudson River Estuary for ambient concentrations (25% of advection), but was of minor importance for the other PCDD/Fs. The study provides evidence that advective transport, local inputs and atmospheric processes combine in a complex manner to control ambient PCDD/F concentrations. These processes generally dominate any local diurnal influence of OH-radical-mediated depletion, which we had hypothesized would be detectable by measuring higher night- and day-time concentrations. Rather, it is implied that changes in the mixed boundary layer height resulted in higher night- than daytime concentrations at the urban and coastal sites. A strong diurnal signal, dominated by the lower chlorinated dioxins and furans, was detected at the rural site (NB) during a period of lower wind speeds.
KW - PCDD/Fs
KW - Air–water exchange
KW - Diurnal
KW - OH-radical reactions
KW - Boundary layer height
U2 - 10.1016/S1352-2310(02)00971-8
DO - 10.1016/S1352-2310(02)00971-8
M3 - Journal article
VL - 37
SP - 959
EP - 969
JO - Atmospheric Environment
JF - Atmospheric Environment
SN - 1352-2310
IS - 7
ER -