HR: 11:20h
AN: A32A-05    [Abstracts]
TI: Light Absorbing Carbon Emissions from Commercial Shipping: Impacts for Local Air quality and the Arctic
AU: * Lack, D A
EM: daniel.lack@noaa.gov
AF: NOAA Earth Systems Science Laboratory, 325 Broadway, Boulder, CO 80304, United States
AU: * Lack, D A
EM: daniel.lack@noaa.gov
AF: University of Colorado, Cooperative Institute for Research of the Environmental Sciences, Boulder, Boulder, CO 80304, United States
AU: Lerner, B
EM: Brian.Lerner@noaa.gov
AF: NOAA Earth Systems Science Laboratory, 325 Broadway, Boulder, CO 80304, United States
AU: Lerner, B
EM: Brian.Lerner@noaa.gov
AF: University of Colorado, Cooperative Institute for Research of the Environmental Sciences, Boulder, Boulder, CO 80304, United States
AU: Granier, C
EM: claire.granier@noaa.gov
AF: NOAA Earth Systems Science Laboratory, 325 Broadway, Boulder, CO 80304, United States
AU: Granier, C
EM: claire.granier@noaa.gov
AF: University of Colorado, Cooperative Institute for Research of the Environmental Sciences, Boulder, Boulder, CO 80304, United States
AU: Granier, C
EM: claire.granier@noaa.gov
AF: Service d'Aeronomie/IPSL, Universite Pierre et Marie Curie, Paris, Paris, 1, France
AU: Massoli, P
EM: paola.massoli@noaa.gov
AF: NOAA Earth Systems Science Laboratory, 325 Broadway, Boulder, CO 80304, United States
AU: Massoli, P
EM: paola.massoli@noaa.gov
AF: University of Colorado, Cooperative Institute for Research of the Environmental Sciences, Boulder, Boulder, CO 80304, United States
AU: Baynard, T
EM: tahllee.baynard@comcast.net
AF: NOAA Earth Systems Science Laboratory, 325 Broadway, Boulder, CO 80304, United States
AU: Baynard, T
EM: tahllee.baynard@comcast.net
AF: University of Colorado, Cooperative Institute for Research of the Environmental Sciences, Boulder, Boulder, CO 80304, United States
AU: Lovejoy, E
EM: edward.lovejoy@noaa.gov
AF: NOAA Earth Systems Science Laboratory, 325 Broadway, Boulder, CO 80304, United States
AU: Ravishankara, A
EM: a.r.ravishankara@noaa.gov
AF: NOAA Earth Systems Science Laboratory, 325 Broadway, Boulder, CO 80304, United States
AU: WIlliams, E
EM: eric.williams@noaa.gov
AF: NOAA Earth Systems Science Laboratory, 325 Broadway, Boulder, CO 80304, United States
AU: WIlliams, E
EM: eric.williams@noaa.gov
AF: University of Colorado, Cooperative Institute for Research of the Environmental Sciences, Boulder, Boulder, CO 80304, United States
AB: Emissions of light absorbing carbon (LAC) are a major uncertainty when considering the climatic effect of this aerosol. LAC contributes to direct radiative warming, can affect cloud formation and dynamics and can alter the albedo of snow and ice. Commercial shipping vessels contribute significant amounts of LAC to the atmosphere by burning residual fuels with little emissions regulation. Knowledge of the actual emissions of LAC from shipping is highly uncertain yet critical to help constrain budgets of LAC. This is of particular concern in populated port areas where continuous loading operations can contribute to adverse air quality and in regions like the Arctic that will become exposed to larger volumes of shipping traffic as sea ice retreats. A single directly-measured emission factor from shipping has previously been reported. Here we present an extensive set of measurements of the emission characteristics of LAC from commercial shipping. We show that the highest emitters (mass of LAC per unit fuel burnt) are tug boats, thus making significant contributions to local air quality in major ports, and that emission of LAC is unrelated to primary emissions of NOX and SO2. Using 2001 shipping fuel consumption data we calculate a global LAC contribution from shipping of 133 Gg yr-1, or ~ 1.7 % of global LAC. The optical characteristics of these emissions are also discussed. We also present results from global transport modeling of the estimated impact of increases in commercial shipping through Arctic sea lanes.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0360 Radiation: transmission and scattering
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting