HR: 0800h
AN: A51E-0130    [Abstracts]
TI: Measurements of Gas and Particle Emissions From Commercial Marine Vessels
AU: * Williams, E
EM: eric.j.williams@noaa.gov
AF: Aeronomy Laboratory/NOAA, 325 Broadway, Boulder, CO 80305 United States
AU: * Williams, E
EM: eric.j.williams@noaa.gov
AF: CIRES, University of Colorado, Boulder, CO 80309 United States
AU: Lerner, B
EM: brian.lerner@noaa.gov
AF: Aeronomy Laboratory/NOAA, 325 Broadway, Boulder, CO 80305 United States
AU: Lerner, B
EM: brian.lerner@noaa.gov
AF: CIRES, University of Colorado, Boulder, CO 80309 United States
AU: Quinn, P
EM: patricia.k.quinn@noaa.gov
AF: Pacific Marine Environmental Laboratory/NOAA, 7600 Sand Point Way NE, Seattle, WA 98115 United States
AU: Bates, T
EM: tim.bates@noaa.gov
AF: Pacific Marine Environmental Laboratory/NOAA, 7600 Sand Point Way NE, Seattle, WA 98115 United States
AB: Commercial marine vessels are powered by large diesel engines with power outputs up to 80 MW and typically consume high-sulfur fuel. They can be viewed as small floating power plants that produce large quantities of nitrogen oxides, sulfur dioxide, and particles. Thus these vessels can be significant pollution sources globally, regionally (e.g., coastal shipping lanes) and locally (e.g., ports). Assessment of this significance is done via emission inventory modelling in which activity factors are combined with emission factors to produce estimates of source strengths over different scales. This work addresses potential uncertainties in marine vessel emission factors. Measurements of trace gases and particles in the exhaust plumes from commercial marine vessels were made from the NOAA research vessel Ronald H. Brown during the 2002 and 2004 NEAQS missions in the Gulf of Maine. Numerous encounters with these exhaust plumes provided the opportunity to examine emission of NOx, SO2, CO, CO2, particle number, and particle composition from these ships. Data from these studies suggest that emission factors used in current inventories may not adequately represent emission from ships under actual operating conditions. For example, our NOy data indicate that current inventories may overestimate these emissions by 20-30%. Though emission of CO by marine diesel engines is typically very low, several encounters with diesel-powered fishing vessel exhaust plumes showed high levels of CO which may indicate that engine maintenance plays a large role in the actual emissions from these vessels. Particle composition data from a container ship plume indicate that sub-micron mass was principally organic and not sulfate while literature data suggest a strong dependence of particle mass emission on the fuel sulfur level. In this presentation we will discuss the emission factors determined from our data and the importance of marine vessel emissions at different scales.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0368 Troposphere: constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005