ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-12-3985-2012 Black carbon from ships: a review of the effects of ship speed, fuel quality and exhaust gas scrubbing Lack D. A. 1 2 Corbett J. J. 3 Chemical Sciences Division, Earth System Research Laboratory, NOAA, Boulder, Colorado, USA Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado, USA College of Marine and Earth Studies, University of Delaware, Newark, Delaware, USA 04 05 2012 12 9 3985 4000 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/12/3985/2012/acp-12-3985-2012.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/12/3985/2012/acp-12-3985-2012.pdf

The International Maritime Organization (IMO) has moved to address the health and climate impact of the emissions from the combustion of low-quality residual fuels within the commercial shipping industry. Fuel sulfur content (F<sub>S</sub>) limits and an efficiency design index for future ships are examples of such IMO actions. The impacts of black carbon (BC) emissions from shipping are now under review by the IMO, with a particular focus on the potential impacts of future Arctic shipping. <br><br> Recognizing that associating impacts with BC emissions requires both ambient and onboard observations, we provide recommendations for the measurement of BC. We also evaluate current insights regarding the effect of ship speed (engine load), fuel quality and exhaust gas scrubbing on BC emissions from ships. Observations demonstrate that BC emission factors (EF<sub>BC</sub>) increases 3 to 6 times at very low engine loads (<25% compared to EF<sub>BC</sub> at 85–100% load); absolute BC emissions (per nautical mile of travel) also increase up to 100% depending on engine load, even with reduced load fuel savings. If fleets were required to operate at lower maximum engine loads, presumably associated with reduced speeds, then engines could be re-tuned, which would reduce BC emissions. <br><br> Ships operating in the Arctic are likely running at highly variable engine loads (25–100%) depending on ice conditions and ice breaking requirements. The ships operating at low load may be emitting up to 50% more BC than they would at their rated load. Such variable load conditions make it difficult to assess the likely emissions rate of BC. <br><br> Current fuel sulfur regulations have the effect of reducing EF<sub>BC</sub> by an average of 30% and potentially up to 80% regardless of engine load; a removal rate similar to that of scrubbers. <br><br> Uncertainties among current observations demonstrate there is a need for more information on a) the impact of fuel quality on EF<sub>BC</sub> using robust measurement methods and b) the efficacy of scrubbers for the removal of particulate matter by size and composition.

 References Agrawal, H., Malloy, Q. G. J., Welch, W. A., Wayne Miller, J., and CockerIII, D. R.: In-use Gaseous and Particulate Matter Emissions from a Modern Ocean Going Container Vessel, Atmos. Environ., 42, 5504–5510, http://dx.doi.org/10.1016/j.atmosenv.2008.02.053doi:10.1016/j.atmosenv.2008.02.053, 2008. Agrawal, H., Welch, W. A., Henningsen, S., Miller, J. W., and Cocker III, D. R.: Emissions from Main Propulsion Engine on a Container Ship at Sea, J. Geophys. Res., 115, D23205, http://dx.doi.org/10.1029/2009jd013346doi:10.1029/2009jd013346, 2010. American-Bureau-of-Shipping: Notes on Heavy Fuel Oil: http://www.eagle.org/eagleExternalPortalWEB/ShowProperty/BEA Repository/News & Events/Publications/ABSInternationalDirectory, 2001. AMSA: Arctic Marine Shipping Assessment 2009 Report: http://www.pame.is/images/stories/PDF_Files/AMSA_2009_Report_2nd_print.pdf, 2009. Andersson, J. and de Vries, S.: Results of the Evaluation of an Exhaust Scrubber: A Screening Report for Sustainable Maritime Solutions, Ricardo, UK, 33, 2009. Andreae, M. O. and Gelencsér, A.: Black carbon or brown carbon? The nature of light-absorbing carbonaceous aerosols, Atmos. Chem. Phys., 6, 3131–3148, http://dx.doi.org/10.5194/acp-6-3131-2006doi:10.5194/acp-6-3131-2006, 2006. Arctic-Council: Final Report: Meeting of Deputy Ministers (27 May 2010): http://arctic-council.org/filearchive/DMM 27 May 2010 Final Report.pdf, 2010. Arnott, W. P., Hamasha, K., Moosmuller, H., Sheridan, P. J., and Ogren, J. A.: Towards Aerosol Light-Absorption Measurements with a 7-Wavelength Aethalometer: Evaluation with a Photoacoustic Instrument and 3-Wavelength Nephelometer, Aerosol Sci. Tech., 39, 17–29, 2005. Arnott, W. P., Walker, J. W., Moosm\c ller, H., Elleman, R. A., Jonsson, H. H., Buzorius, G., Conant, W. C., Flagan, R. C., and Seinfeld, J. H.: Photoacoustic insight for Aerosol Light Absorption Aloft from Meteorological Aircraft and Comparison with Particle Soot Absorption Photometer Measurements: DOE Southern Great Plains Climate Research Facility and the Coastal Stratocumulus Imposed Perturbation Experiments, J. Geophys. Res., 111, D05S02, http://dx.doi.org/10.1029/2005jd005964doi:10.1029/2005jd005964, 2006. Bond, T. C., Anderson, T. L., and Campbell, D.: Calibration and Intercomparison of Filter-Based Measurements of Visible Light Absorption by Aerosols, Aerosol Sci. Tech., 30, 582–600, 1999. Bond, T. C., and Bergstrom, R. W.: Light Absorption by Carbonaceous Particles: An Investigative Review, Aerosol Sci. Tech., 40, 27-67, 2006. Boparai, P., Lee, J., and Bond, T. C.: Revisiting Thermal-Optical Analyses of Carbonaceous Aerosol using a Physical Model, Aerosol Sci. Technol., 42, 930–948, http://dx.doi.org/10.1080/02786820802360690doi:10.1080/02786820802360690, 2008. Brown, D.: Helping Shipowners Cut Fuel Bills with Wartsila Low-Speed Engines, Wartsila Techn. J. 01, 34–37, 2009. Buffaloe, G., Cappa, C., Williams, E., Coffman, D. J., Hayden, K., Lack, D. A., Lerner, B., Li, S.-M., Massoli, P., Nuaanman, I., Onasch, T. B., and Quinn, P. K.: Particulate Emissions from Commercial Shipping in the Califronia Fuel Quality Regulated Zone, J. Geophys. Res., in preparation, 2012. Buhaug, Ø., Corbett, J. J., Endresen, Ø., Eyring, V., Faber, J., Hanayama, S., Lee, D. S., Lee, D., Lindstad, H., Mjelde, A., Pålsson, C., Wanquing, W., Winebrake, J. J., and Yoshida, K.: Second IMO GHG study 2009, International Maritime Organization, London, UK, 129, 2009. Burtscher, H.: Physical Characterization of Particulate Emissions from Diesel Engines: A Review, J. Aero. Sci, 36, 896–932, http://dx.doi.org/10.1016/j.jaerosci.2004.12.001doi:10.1016/j.jaerosci.2004.12.001, 2005. Cappa, C. D., Williams, E., Buffaloe, G., Coffman, D. J., Hayden, K., Lack, D. A., Lerner, B., Li, S.-M., Massoli, P., Nuaanman, I., Onasch, T. B., and Quinn, P. K.: The Influence of Operating Speed on Gas and Particle-Phase Emissions from the R/V Miller Freeman, Environ. Sci. Technol., under review, 2012. CARB: Final Regulation Order. Fuel Sulfur and Other Operational Requirments for Ocean-Going Vessels Within California Waters and 24 Nautical Miles of the California Baseline, California Air Resources Board, 2009a. CARB: Vessel Speed Reduction for Ocean-going Vessels: http://www.arb.ca.gov/ports/marinevess/vsr/vsr.htm, 2009b. Christian, V. R., Knopf, F., Jaschek, A., and Schindler, W.: Messmethodik der Bosch-Zahl mit erhohter Empfindlichkeit, Motortech. Z., 54, 16–22, 1993. Corbett, J. J., Winebrake, J. J., Green, E. H., Kasibhatla, P., Eyring, V., and Lauer, A.: Mortality from Ship Emissions: A Global Assessment, Environ. Sci. Technol., 41, 8512–8518, http://dx.doi.org/10.1021/es071686zdoi:10.1021/es071686z, 2007. Corbett, J. J., Wang, H., and Winebrake, J. J.: The Effectiveness and Costs of Speed Reductions on Emissions from International Shipping, Trans. Res. D: Trans. Environ., 14, 593–598, http://dx.doi.org/10.1016/j.trd.2009.08.005doi:10.1016/j.trd.2009.08.005, 2009. Corbett, J. J., Lack, D. A., Winebrake, J. J., Harder, S., Silberman, J. A., and Gold, M.: Arctic Shipping Emissions Inventories and Future Scenarios, Atmos. Chem. Phys., 10, 9689–9704, http://dx.doi.org/10.5194/acp-10-9689-2010doi:10.5194/acp-10-9689-2010, 2010a. Corbett, J. J., Winebrake, J. J., and Green, E. H.: An Assessment of Technologies for Treducing Regional Short-Lived Climate Forcers Emitted by Ships with Implications for Arctic Shipping, Carb. Manage., 1, 207–225, http://dx.doi.org/10.4155/cmt.10.27doi:10.4155/cmt.10.27, 2010b. Cross, E. S., Onasch, T., Ahern, A. T., Wrobel, W., Slowik, J., Olfert, J., Lack, D. A., Massoli, P., Cappa, C. D., Schwarz, J. P., et al.: Soot Particle Studies – Instrument Inter-Comparison – Project Overview, Aerosol Sci. Tech., 44, 592–611, 2010. deKat, J.: (Super) Slow Steaming: The Maersk Experience: http://www.transportenvironment.org/events/seminar-slow-steaming-and-speed-limits-shipping, 2011. Eide, L. I., Eide, M. S., and Endresen, Ø.: Shipping Across the Arctic Ocean: A Feasible Option in 2030–2050 as a Result of Global Warming?: http://www.dnv.com/resources/position_papers/shipping_arctic.asp, 2010. EU: A sustainable EU policy for the High North, European Parliament, 2009/2214(INI), 2011. Eyring, V., Kohler, H. W., van Aardenne, J., and Lauer, A.: Emissions from International Shipping: 1. The Last 50 Years, J. Geophys. Res., 110, D17305, http://dx.doi.org/10.1029/2004JD005619doi:10.1029/2004JD005619, 2005. Eyring, V., Isaksen, I. S. A., Berntsen, T., Collins, W. J., Corbett, J. J., Endresen, O., Grainger, R. G., Moldanova, J., Schlager, H., and Stevenson, D. S.: Transport Impacts on Atmosphere and Climate: Shipping, Atmos. Environ., 44, 4735–4771, 2010. Flanner, M. G., Zender, C. S., Randerson, J. T., and Rasch, P. J.: Present-day Climate Forcing and Response from Black Carbon in Snow, J. Geophys. Res., 112, D11202, http://dx.doi.org/10.1029/2006JD008003doi:10.1029/2006JD008003, 2007. Hamworthy: Exhaust Gas Cleaning Systems, http://www.hamworthy.com/PageFiles/1774/Exhaust Gas Cleaning Systems.pdf, 2011. Hansen, J. and Nazarenko, L.: Soot Climate Forcing Via Snow and Ice Albedos, Proc. Natl. Acad. Sci., 101, 423–428 http://dx.doi.org/10.1073/pnas.2237157100doi:10.1073/pnas.2237157100, 2004. Harvald, S.: Prediction of Power of Ships, Department of Ocean Engineering, Technical University of Denmark, Lyngby, Denmark, 1977. IMO: New Rules to Reduce Emissions from Ships Enter Into Force: http://www.imo.org/blast/mainframe.asp?topic_id=1018&doc_id=4884, 2005. IMO: North Sea SECA in effect from 22 November 2007: http://www.imo.org/inforesource/mainframe.asp?topic_id=1472&doc_id=8719, 2007. IMO: Amendments to MARPOL Annex VI, Amendments to the NOx Technical Code, IMO MEPC 58, London, UK, 2008. IMO: Proposal to Designate an Emission Control Area for Nitrogen Oxides, Sulphur Oxides and Particulate Matter. Submitted by the United States and Canada., IMO MEPC 59, 2009. IMO: Emissions Inventory and Analysis of Impacts of Short-Lived Climate Forcing Aerosols from International Shipping Activity in the Arctic, 15th Session of the Bulk Liquids and Gases Sub-Committee of the International Maritime Organisation, London, UK, 2010a. IMO: Air Pollution from Ships Cut with Entry Into Force of MARPOL Amendments: http://www.imo.org/newsroom/mainframe.asp?topic_id=1859&doc_id=13309, 2010b. IMO: Report of the Marine Environement Protection Committee on its Sixty-Second Session, IMO MEPC 62, London, UK, 2011a. IMO: Definition and Measurement of Black Carbon in International Shipping, 16th Session of the Bulk Liquids and Gases Sub-Committee of the International Maritime Organisation, London, UK, 2011b. IMO: Resolution MEPC 203 (62). 2011 Amendments to MARPOL Annex VI: Energy Efficiency, IMO MEPC 62, London, UK, 2011c. IMO: Development of a Mandatory Code for Ships Operating in Polar Waters: Report of the correspondence group, International Maritime Organisation: Sub-Committee on Ship Design and Equipment, 56th Session, London, UK, 2012a. IMO: Development of a Mandatory Code for Ships Operating in Polar Waters: Proposals for the content of the Polar Water Operational Manual, International Maritime Organisation: Sub-Committee on Ship Design and Equipment, 56th Session, London, UK, 2012b. IMO: Development of a Mandatory Code for Ships Operating in Polar Waters: Information on Compression in a Sea Ice Field, International Maritime Organisation: Sub-Committee on Ship Design and Equipment, 56th Session, London, UK, 2012c. ISO: Petroleum Products – Fuels (class F) – Specifications of Marine Fuels; ISO 8217: 1987(E), Geneva, Switzerland, 15 April, 1987. Jayaram, V., Agrawal, H., Welch, W. A., Miller, J. W., and Cocker, D. R.: Real-Time Gaseous, PM and Ultrafine Particle Emissions from a Modern Marine Engine Operating on Biodiesel, Environ. Sci. Technol., 45, 2286–2292, http://dx.doi.org/10.1021/es1026954doi:10.1021/es1026954, 2011. Kasper, A., Aufdenblatten, S., Forss, A., Mohr, M., and Burtscher, H.: Particulate Emissions from a Low-Speed Marine Diesel Engine, Aerosol Sci. Tech., 41, 24–32, 2007. Kircher, D.: Holland America Line Sea Water Scrubber Demonstration Project. Presented at: Faster Freight, Cleaner Air Northwest Conference, Seattle, WA, USA, 2008. Kondo, Y., Sahu, L., Kuwata, M., Miyazaki, Y., Takegawa, N., Moteki, N., Imaru, J., Han, N. S., Nakayama, T., Kim-Oanh, N. T., et al.: Stabilization of the Mass Absorption Cross Section of Black Carbon for Filter-Based Absorption Photometry by the Use of a Heated Inlet, Aerosol Sci. Tech., 43, http://dx.doi.org/10.1080/02786820902889879doi:10.1080/02786820902889879, 2009. Kondo, Y., Sahu, L., Moteki, N., Khan, F., Takegawa, N., Liu, X., Koike, M., and Miyakawa, T.: Consistency and Traceability of Black Carbon Measurements Made by Laser-Induced Incandescence, Thermal-Optical Transmittance, and Filter-Based Photo-Absorption Techniques, Aerosol Sci. Tech., 45, 295–312, http://dx.doi.org/10.1080/02786826.2010.533215doi:10.1080/02786826.2010.533215, 2011. Lack, D., Lovejoy, E., Baynard, T., Pettersson, A., and Ravishankara, A.: Aerosol Absorption Measurement Using Photoacoustic Spectroscopy: Sensitivity, Calibration, and Uncertainty Developments, Aerosol Sci. Tech., 40, 697–708, 2006. Lack, D. A., Cappa, C. D., Covert, D. S., Baynard, T., Massoli, P., Sierau, B., Bates, T. S., Quinn, P. K., Lovejoy, E. R., and Ravishankara, A. R.: Bias in Filter-Based Aerosol Light Absorption Measurements Due to Organic Aerosol Loading: Evidence from Ambient Measurements, Aerosol Sci. Tech., 42, 1033–1041, 2008a. Lack, D. A., Lerner, B., Granier, C., Baynard, T., Lovejoy, E. R., Massoli, P., Ravishankara, A. R., and Williams, E.: Light Absorbing Carbon Emissions from Commercial Shipping, Geophys. Res. Lett., 35, L13815, http://dx.doi.org/10.1029/2008GL033906doi:10.1029/2008GL033906, 2008b. Lack, D. A., Corbett, J. J., Onasch, T. B., Lerner, B., Massoli, P., Quinn, P. K., Bates, T. S., Covert, D., Coffman, D. J., Sierau, B., et al.: Particulate Emissions from Commercial Shipping. Chemical, Physical and Optical Proprties, J. Geophys. Res., 114, D00F04, http://dx.doi.org/10.1029/2008/JD011300doi:10.1029/2008/JD011300, 2009. Lack, D. A., Cappa, C. D., Langridge, J., Bahreini, R., Buffaloe, G., Brock, C., Cerully, K., Coffman, D., Hayden, K., Holloway, J., et al.: Impact of Fuel Quality Regulation and Speed Reductions on Shipping Emissions: Implications for Climate and Air Quality, Environ. Sci. Technol., 45, 9052–9060, http://dx.doi.org/10.1021/es2013424doi:10.1021/es2013424, 2011. Lauer, A., Eyring, V., Corbett, J. J., Wang, C., and Winebrake, J. J.: Assessment of Near-Future Policy Instruments for Oceangoing Shipping: Impact on Atmospheric Aerosol Burdens and the Earth's Radiation Budget, Environ. Sci. Technol., 43, 5592–5598, http://dx.doi.org/10.1021/es900922hdoi:10.1021/es900922h, 2009. MAN: Basic Principles of Ship Propulsion, 2004. MAN-Diesel-SE: Operation on Low-Sulphur Fuels. MAN B&W Two-Stroke Engines, MAN B&W, Copenhagen, 1–24, 2010. Maricq, M. M.: Chemical Characterization of Particulate Emissions from Diesel Engines: A Review, J. Aero. Sci, 38, 1079–1118, http://dx.doi.org/10.1016/j.jaerosci.2007.08.001doi:10.1016/j.jaerosci.2007.08.001, 2007. Marin-Morales, M. A., Leme, D. M., and Mazzeo, D. E. C.: Polycyclic Aromatic Hydrocarbons: Pollution, Health Effects and Chemistry, edited by: Haines, P. A. and Hendrickson, M. D., Nova Science Publishers, 361 pp., New York, USA, 2009. Marine-Exhaust-Solutions: Scrubber Development Beats Regulations in Environmental Stakes: http://www.marineexhaustsolutions.com/mediacentre_det.asp?id=61, 2006. McCallum, J.: Safe Speed in Ice – An analysis of Transit Speed and Ice decision Numerals, Transport Canada, 1996. Moosmuller, H., Chakrabarty, R. K., and Arnott, W. P.: Aerosol Light Absorption and its Measurement: A Review, J. Quant. Spectrosc. Rad. T., 110, 844–878, http://dx.doi.org/10.1016/j.jqsrt.2009.02.035doi:10.1016/j.jqsrt.2009.02.035, 2009. Moteki, N. and Kondo, Y.: Dependence of Laser-Induced Incandescence on Physical Properties of Black Carbon Aerosols: Measurements and Theoretical Interpretation, Aerosol Sci. Tech., 44, 663–675, http://dx.doi.org/10.1080/02786826.2010.484450doi:10.1080/02786826.2010.484450, 2010. Myhre, G., Shine, K. P., Radel, G., Gauss, M., Isaksen, I. S. A., Tang, Q., Prather, M. J., Williams, J. E., van Velthoven, P., Dessens, O., Koffi, B., Szopa, S., Hoor, P., Grewe, V., Borken-Kleefeld, J., Berntsen, T. K., and Fuglestvedt, J. S.: Radiative Forcing Due to Changes in Ozone and Methane Caused by the Transport Sector, Atmos. Environ., 45, 387–394, http://dx.doi.org/10.1016/j.atmosenv.2010.10.001doi:10.1016/j.atmosenv.2010.10.001, 2011. Nakayama, T., Kondo, Y., Moteki, N., Sahu, L. K., Kinase, T., Kita, K., and Matsumi, Y.: Size-Dependent Correction Factors for Absorption Measurements using Filter-based Photometers: PSAP and COSMOS, J. Aerosol. Sci., 41, 333–343, 2010. NOAA: Compliance Guide for Right Whale Ship Strike Reduction Rule, National Marine Fisheries Service, 2008. Northrop, W. F., Bohac, S. V., Chin, J.-Y., and Assanis, D. N.: Comparison of Filter Smoke Number and Elemental Carbon Mass From Partially Premixed Low Temperature Combustion in a Direct-Injection Diesel Engine, Journal of Engineering for Gas Turbines and Power, 133, 102804–102806, http://dx.doi.org/10.1115/1.4002918doi:10.1115/1.4002918, 2011. Petzold, A., Feldpausch, P., Fritzsche, L., Minikin, A., Lauer, A., and Bauer, H.: Particle Emissions from Ship Engines, European Aerosol Conference, Budapest, Hungary, http://www.scientificcommons.org/17769664, 2004. Petzold, A., Weingartner, E., Hasselbach, J., Lauer, A., Kurok, C., and Fleischer, F.: Physical Properties, Chemical Composition, and Cloud Forming Potential of Particulate Emissions from a Marine Diesel Engine at Various Load Conditions, Environ. Sci. Technol., 44, 3800–3805, 2010. Petzold, A., Lauer, P., Fritsche, U., Hasselbach, J., Lichtenstern, M., Schlager, H., and Fleischer, F.: Operation of Marine Diesel Engines on Biogenic Fuels: Modification of Emissions and Resulting Climate Effects, Environ. Sci. Technol., 45, 10394–10400, http://dx.doi.org/10.1021/es2021439doi:10.1021/es2021439, 2011a. Petzold, A., Marsh, R., Johnson, M., Miller, M., Sevcenco, Y., Delhaye, D., Ibrahim, A., Williams, P., Bauer, H., Crayford, A., Bachalo, W. D.. and Raper, D.: Evaluation of Methods for Measuring Particulate Matter Emissions from Gas Turbines, Environ. Sci. Technol., 45, 3562–3568, http://dx.doi.org/10.1021/es103969vdoi:10.1021/es103969v, 2011b. Port-of-San-Diego: Vessel Speed Reduction Program, San Diego, CA, USA, 2009. PWC: A Game Changer for the Shipping Industry? An analysis of the future impact of carbon regulations on environment and industry: http://www.scribd.com/doc/68027866/Shipping-GHG-PwC-Final, 2011. Quinn, P. K., Bates, T. S., Baum, E., Doubleday, N., Fiore, A. M., Flanner, M., Fridlind, A., Garrett, T. J., Koch, D., Menon, S., Shindell, D., Stohl, A., and Warren, S. G.: Short-lived pollutants in the Arctic: their climate impact and possible mitigation strategies, Atmos. Chem. Phys., 8, 1723–1735, http://dx.doi.org/10.5194/acp-8-1723-2008doi:10.5194/acp-8-1723-2008, 2008. Quinn, P. K., Stohl, A., Bernsten, T., Burkhart, J. F., Christensen, J., Flanner, M., Kupiainen, K., Lack, D., H., L., Shepherd, M., Shevchenko, V., Skov, H., and Vestreng, V.: The Impact of Black Carbon on Arctic Climate. AMAP Expert Group on Short-Lived Climate Forcers, 1st Assessment Report, AMAP, 2011. Ramanathan, V. and Carmichael, G.: Global and Regional Climate Changes Due to Black Carbon, Nature Geosci., 1, 221–227, 2008. Ristimaki, J., Hellem, G., and Lappi, M.: Chemical and Physical Characterization of Exhaust Particulate Matter from a Marine Medium Speed Diesel Engine, CIMAC Congress, Bergen, Norway, 2010. Ritchie, A., de Jonge, E., Hugi, C., and Cooper, D.: European Commission Directorate General Environment, Service Contract on Ship Emissions: Assignment, Abatement, and Market-based Instruments. Task 2c – SO<sub>2</sub> Abatement, Entec UK Limited, Cheshire, Northwich, UK, 2005. Rosenthal, E., and Watson, R.: Multilateral Efforts to Reduce Black Carbon Emissions: A Lifeline for the Warming Arctic?, Rev. Eur. Comm. Int. Environ. Law, 20, 3–10, http://dx.doi.org/10.1111/j.1467-9388.2011.00705.xdoi:10.1111/j.1467-9388.2011.00705.x, 2011. Sarvi, A., Fogelholm, C.-J., and Zevenhoven, R.: Emissions from Large-Scale Medium-Speed Diesel Engines: 1. Influence of Engine Operation Mode and Turbocharger, Fuel Proc. Technol., 89, 510–519, http://dx.doi.org/10.1016/j.fuproc.2007.10.006doi:10.1016/j.fuproc.2007.10.006, 2008a. Sarvi, A., Fogelholm, C.-J., and Zevenhoven, R.: Emissions from Large-Scale Medium-Speed Diesel Engines: 2. Influence of Fuel Type and Operating Mode, Fuel Proc. Technol., 89, 520–527, http://dx.doi.org/10.1016/j.fuproc.2007.10.005doi:10.1016/j.fuproc.2007.10.005, 2008b. Schmid, H., Laskus, L., Jorgen Abraham, H., Baltensperger, U., Lavanchy, V., Bizjak, M., Burba, P., Cachier, H., Crow, D., Chow, J., Gnauk, T., Even, A., ten Brink, H. M., Giesen, K.-P., Hitzenberger, R., Hueglin, C., Maenhaut, W., Pio, C., Carvalho, A., Putaud, J.-P., Toom-Sauntry, D., and Puxbaum, H.: Results of the "carbon conference" international aerosol carbon round robin test stage I, Atmos. Environ., 35, 2111–2121, http://dx.doi.org/10.1016/s1352-2310(00)00493-3doi:10.1016/s1352-2310(00)00493-3, 2001. Schwarz, J. P., Gao, R. S., Fahey, D. W., Thomson, D. S., Watts, L. A., Wilson, J. C., Reeves, J. M., Darbeheshti, M., Baumgardner, D. G., Kok, G. L., Chung, S. H., Schulz, M., Hendricks, J., Lauer, A., Kurcher, B., Slowik, J. G., Rosenlof, K. H., Thompson, T. L., Langford, A. O., Loewenstein, M., and Aikin, K. C.: Single-Particle Measurements of Midlatitude Black Carbon and Light-Scattering Aerosols from the Boundary Layer to the Lower Stratosphere, J. Geophys. Res., 111, D16207, http://dx.doi.org/10.1029/2006jd007076doi:10.1029/2006jd007076, 2006. Sheridan, P. J., Arnott, W. P., Ogren, J. A., Andrews, E., Atkinson, D. B., Strawa, A. W., Varma, R., and Virkkula, A.: The Reno Aerosol Optics Study: An Evaluation of Aerosol Absorption Measurement Methods, Aerosol Sci. Tech., 39, 1–16, 2005. Schwarz, J. P., Gao, R. S., Fahey, D. W., Thomson, D. S., Watts, L. A., Wilson, J. C., Reeves, J. M., Darbeheshti, M., Baumgardner, D. G., Kok, G. L., Chung, S. H., Schulz, M., Hendricks, J., Lauer, A., Kurcher, B., Slowik, J. G., Rosenlof, K. H., Thompson, T. L., Langford, A. O., Loewenstein, M., and Aikin, K. C.: Public Health Benefits of Strategies to Reduce Greenhouse-Gas Emissions: Health Implications of Short-Lived Greenhouse Pollutants, The Lancet, 374, 2091–2103, 2009. Somanathan, S., Flynn, P. C., and Szymanski, J.: The Northwest Passage: A Simulation, Transportation Research Part A, 43, 127–135, 2009. Timco, G. W. and Johnson, D. W.: Arctic Ice Regime Shipping System, edited by: Center, C. H., Canadian Hydraulics Center, National Research Council of Canada, Ottawa, Canada, 2003. Timco, G. W., Kubat, I., and Johnston, M.: Scientific Basis for the Canadian Ice Regime System, 18th International Conference on Port and Ocean Engineering under Arctic Conditions, Potsdam, NY, USA, 2005. US-EPA: Analysis of Commercial Marine Vessels Emissions and Fuel Consumption Data, United States Environmental Protection Agency, 2000. Wettstein, R. and Brown, D.: Derating: A Solution for High Fuel Savings and Lower Emissions, Wartsila Corporation, 2008. Williams, E., Lerner, B., Murphy, P., Herndon, S. C., and Zahniser, M. S.: Emissions of NO$_\text x$, SO<sub>2</sub>, CO, and C<sub>2</sub>H<sub>4</sub> from Commercial Marine Shipping During Texas Air Quality Study (TexAQS) 2006, J. Geophys. Res., 114, D21306, http://dx.doi.org/10.1029/2009JD012094doi:10.1029/2009JD012094, 2009. Winebrake, J. J., Corbett, J. J., Green, E. H., Lauer, A., and Eyring, V.: Mitigating the Health Impacts of Pollution from Oceangoing Shipping: An Assessment of Low-Sulfur Fuel Mandates, Environ. Sci. Technol., 43, 4776–4782, http://dx.doi.org/10.1021/es803224qdoi:10.1021/es803224q, 2009.