HR: 0830h
AN: A51D-0712    [PDF]
TI: Halocarbons, alkyl nitrates, and nonmethane hydrocarbons quantified from surface air and water samples in the Gulf of Maine during NEAQS
AU: * Haase, K B
EM: holstien@nmt.edu
AF: Department of Chemistry, New Mexico Institute of Mining and Technology, 801 Leroy Place, Socorro, NM 87801 United States
AU: Harlow, A
EM: aharlow@nmt.edu
AF: Department of Chemistry, New Mexico Institute of Mining and Technology, 801 Leroy Place, Socorro, NM 87801 United States
AU: Sive, B C
EM: bcs@ccrc.sr.unh.edu
AF: Climate Change Research Center, Institute for the Study of Earth, Oceans and Space, University of New Hampshire, Durham, NH 03824 United States
AU: Wingenter, O W
EM: Oliver@nmt.du
AF: Department of Chemistry, New Mexico Institute of Mining and Technology, 801 Leroy Place, Socorro, NM 87801 United States
AB: During the New England Air Quality Study (NEAQS) campaign, July-August 2002, natural and anthropogenic halocarbons, alkyl nitrates, and nonmethane hydrocarbons (NMHCs) in surface air and water samples were quantified in situ using gas chromatography with flame ionization and electron capture detection aboard the NOAA R/V Ronald H. Brown. The cruise focused on an area in the Gulf of Maine, south of Portsmouth Harbor, near the Isle of Shoals, and in the Boston Harbor area. Between Cape Ann and Newburyport, saturation anomalies for anthropogenic halocarbons of 100% for CFC-113, 140% for H-1211, 40% for methyl chloroform, and 15% for carbon tetrachloride were observed. Throughout the cruise, subsequent high levels of these compounds were found in the area. The findings suggest that there are local anthropogenic sources of these gases, which are draining into the Gulf of Maine from local rivers, harbors, or estuaries. Elevated level of methyl bromide, methyl iodide, bromoform, and chloroform were measured near the coast, and decreased with increasing distance. The distributions of the NMHCs were similar to the naturally produced marine halocarbons, suggesting similar sources. Supersaturation of alkyl nitrates were observed indicating an oceanic source of methyl nitrate, i-propyl nitrate, n-propyl nitrate, and 2-butyl nitrate, with the later three compounds reported here in ocean water samples for the first time.
DE: 0312 Air/sea constituent fluxes (3339, 4504)
DE: 0315 Biosphere/atmosphere interactions
DE: 0322 Constituent sources and sinks
DE: 0365 Troposphere--composition and chemistry
DE: 3339 Ocean/atmosphere interactions (0312, 4504)
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting