Atmos. Chem. Phys. Discuss., 13, 24635-24674, 2013
www.atmos-chem-phys-discuss.net/13/24635/2013/
doi:10.5194/acpd-13-24635-2013
© Author(s) 2013. This work is distributed
under the Creative Commons Attribution 3.0 License.
Review Status
This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
A case study into the measurement of ship emissions from plume intercepts of the NOAA Ship Miller Freeman
C. D. Cappa1, E. J. Williams2,3, D. A. Lack2,3, G. M. Buffaloe1, D. Coffman7, K. L. Hayden5, S. C. Herndon4, B. M. Lerner2,3, S-M. Li5, P. Massoli4, R. McLaren6, I. Nuaaman5,6, T. B. Onasch4, and P. K. Quinn7
1Department of Civil and Environmental Engineering, University of California, Davis, California 95616, USA
2NOAA Earth System Research Laboratory, Boulder, CO, 80305, USA
3Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado, 80305, USA
4Aerodyne Research, Inc., Billerica, Massachusetts, 01821, USA
5Air Quality Research Division, Environment Canada, 4905 Dufferin St., Toronto, M3H5T4, Canada
6Centre for Atmospheric Chemistry, York University, 4700 Keele St., Toronto, M3J1P3, Canada
7NOAA Pacific Marine Environment Laboratory, Seattle, Washington, 98115, USA

Abstract. Emissions factors (EFs) for gas and sub-micron particle-phase species were measured in intercepted plumes as a function of vessel speed from an underway research vessel, the NOAA Ship Miller Freeman, operating a medium-speed diesel engine on low-sulfur marine gas oil. For many of the particle-phase species, EFs were determined using multiple measurement methodologies, allowing for an assessment of how well EFs from different techniques agree. The total sub-micron PM (PM1) was dominated by particulate black carbon (BC) and particulate organic matter (POM), with an average POM / BC ratio of 1.3. Consideration of the POM / BC ratios observed here with literature studies suggests that laboratory and in-stack measurement methods may over-estimate primary POM EFs relative to those observed in emitted plumes. Comparison of four different methods for black carbon measurement indicates that careful attention must be paid to instrument limitations and biases when assessing EFBC. Particulate sulfate (SO42−) EFs were extremely small and the particles emitted by Miller Freeman were inefficient as cloud condensation nuclei (CCN), even at high super saturations, consistent with the use of very low sulfur fuel and the overall small emitted particle sizes. All measurement methodologies consistently demonstrate that the measured EFs (fuel mass basis) for PM1 mass, BC and POM decreased as the ship slowed. Particle number EFs were approximately constant across the speed change, with a shift towards smaller particles being emitted at slower speeds. Emissions factors for gas-phase CO and formaldehyde (HCHO) both increased as the vessel slowed, while EFs for NOx decreased and SO2 EFs were approximately constant.

Citation: Cappa, C. D., Williams, E. J., Lack, D. A., Buffaloe, G. M., Coffman, D., Hayden, K. L., Herndon, S. C., Lerner, B. M., Li, S-M., Massoli, P., McLaren, R., Nuaaman, I., Onasch, T. B., and Quinn, P. K.: A case study into the measurement of ship emissions from plume intercepts of the NOAA Ship Miller Freeman, Atmos. Chem. Phys. Discuss., 13, 24635-24674, doi:10.5194/acpd-13-24635-2013, 2013.
 
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