ACP Atmospheric Chemistry and Physics ACP Atmos. Chem. Phys. 1680-7324 Copernicus Publications Göttingen, Germany 10.5194/acp-13-1853-2013 Radiative forcing of the direct aerosol effect from AeroCom Phase II simulations Myhre G. https://orcid.org/0000-0002-4309-476X 1 Samset B. H. https://orcid.org/0000-0001-8013-1833 1 Schulz M. 2 Balkanski Y. 3 Bauer S. 4 Berntsen T. K. 1 Bian H. 5 Bellouin N. 6 22 Chin M. 7 Diehl T. 7 8 Easter R. C. 9 Feichter J. 10 Ghan S. J. 9 Hauglustaine D. 3 Iversen T. 2 11 Kinne S. 10 Kirkevåg A. 2 Lamarque J.-F. 12 Lin G. 13 Liu X. 8 Lund M. T. 1 Luo G. 14 Ma X. 14 van Noije T. 15 Penner J. E. 13 Rasch P. J. 9 Ruiz A. 15 16 Seland Ø. 2 Skeie R. B. 1 Stier P. 17 Takemura T. 18 Tsigaridis K. 4 Wang P. 15 Wang Z. 19 Xu L. 13 20 Yu H. 5 Yu F. 14 Yoon J.-H. 9 Zhang K. 9 10 Zhang H. 21 Zhou C. 13 Center for International Climate and Environmental Research – Oslo (CICERO), Oslo, Norway Norwegian Meteorological Institute, Oslo, Norway Laboratoire des Sciences du Climat et de l'Environnement, CEA-CNRS-UVSQ, Gif-sur-Yvette, France NASA Goddard Institute for Space Studies and Columbia Earth Institute, New York, NY, USA Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD, USA Met Office Hadley Centre, Exeter, UK NASA Goddard Space Flight Center, Greenbelt, MD, USA Universities Space Research Association, Columbia, MD, USA Pacific Northwest National Laboratory, Richland, WA, USA Max Planck Institute for Meteorology, Hamburg, Germany Department of Geosciences, University of Oslo, Oslo, Norway NCAR Earth System Laboratory, National Center for Atmospheric Research, Boulder, CO, USA Department of Atmospheric, Oceanic, and Space Sciences, University of Michigan, Ann Arbor, Michigan, USA Atmospheric Sciences Research Center, State University of New York at Albany, New York, USA Royal Netherlands Meteorological Institute, De Bilt, The Netherlands LIFTEC, CSIC-Universidad de Zaragoza, Zaragoza, Spain Department of Physics, University of Oxford, Oxford, UK Research Institute for Applied Mechanics, Kyushu University, Fukuoka, Japan Chinese Academy of Meteorological Sciences, Beijing 100081, China Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California, USA Laboratory for Climate Studies, National Climate Center, China Meteorological Administration, Beijing 100081, China now at: Department of Meteorology, University of Reading, Reading, UK 19 02 2013 13 4 1853 1877 Copyright: © 2013 G. Myhre et al. 2013 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://acp.copernicus.org/articles/13/1853/2013/acp-13-1853-2013.html The full text article is available as a PDF file from https://acp.copernicus.org/articles/13/1853/2013/acp-13-1853-2013.pdf

We report on the AeroCom Phase II direct aerosol effect (DAE) experiment where 16 detailed global aerosol models have been used to simulate the changes in the aerosol distribution over the industrial era. All 16 models have estimated the radiative forcing (RF) of the anthropogenic DAE, and have taken into account anthropogenic sulphate, black carbon (BC) and organic aerosols (OA) from fossil fuel, biofuel, and biomass burning emissions. In addition several models have simulated the DAE of anthropogenic nitrate and anthropogenic influenced secondary organic aerosols (SOA). The model simulated all-sky RF of the DAE from total anthropogenic aerosols has a range from −0.58 to −0.02 Wm<sup>−2</sup>, with a mean of −0.27 Wm<sup>−2</sup> for the 16 models. Several models did not include nitrate or SOA and modifying the estimate by accounting for this with information from the other AeroCom models reduces the range and slightly strengthens the mean. Modifying the model estimates for missing aerosol components and for the time period 1750 to 2010 results in a mean RF for the DAE of −0.35 Wm<sup>−2</sup>. Compared to AeroCom Phase I (Schulz et al., 2006) we find very similar spreads in both total DAE and aerosol component RF. However, the RF of the total DAE is stronger negative and RF from BC from fossil fuel and biofuel emissions are stronger positive in the present study than in the previous AeroCom study. We find a tendency for models having a strong (positive) BC RF to also have strong (negative) sulphate or OA RF. This relationship leads to smaller uncertainty in the total RF of the DAE compared to the RF of the sum of the individual aerosol components. The spread in results for the individual aerosol components is substantial, and can be divided into diversities in burden, mass extinction coefficient (MEC), and normalized RF with respect to AOD. We find that these three factors give similar contributions to the spread in results.

 References Aan de Brugh, J., Schaap, M., Vignati, E., Dentener, F., Kahnert, M., Sofiev, M., Huijnen, V., and Krol, M. C.: The European aerosol budget in 2006, Atmos. Chem. Phys., 11, 1117–1139, <a href="http://dx.doi.org/10.5194/acp-11-111-2011">https://doi.org/10.5194/acp-11-111-2011</a>, 2011. Adams, P. J., Seinfeld, J. H., Koch, D., Mickley, L., and Jacob, D.: General circulation model assessment of direct radiative forcing by the sulfate-nitrate-ammonium-water inorganic aerosol system, J. Geophys. Res.-Atmos., 106, 1097–1111, 2001. Balkanski, Y.: L'influence des aérosols sur le climat, Thèse d'Habilitation à Diriger des Recherches. Université Versailles Saint Quentin, France, 2011. Balkanski, Y., Schulz, M., Moulin, C., and Ginoux, P., The formulation of dust emissions on global scale: formulation and validation using satellite retrievals. In: Emissions of Atmospheric Trace Compounds. C. Granier, P. Artaxo and C. Reeves (Editors), Kluwer Academic Publishers, Dordrecht, The Netherlands, 239–267, 2004. Bauer, S. E., Koch, D., Unger, N., Metzger, S. M., Shindell, D. T., and Streets, D. G.: Nitrate aerosols today and in 2030: a global simulation including aerosols and tropospheric ozone, Atmos. Chem. Phys., 7, 5043–5059, <a href="http://dx.doi.org/10.5194/acp-7-5043-2007">https://doi.org/10.5194/acp-7-5043-2007</a>, 2007. Bauer, S. E., Wright, D. L., Koch, D., Lewis, E. R., McGraw, R., Chang, L. S., Schwartz, S. E., and Ruedy, R.: MATRIX (Multiconfiguration Aerosol TRacker of mIXing state): an aerosol microphysical module for global atmospheric models, Atmos. Chem. Phys., 8, 6003–6035, <a href="http://dx.doi.org/10.5194/acp-8-6003-2008">https://doi.org/10.5194/acp-8-6003-2008</a>, 2008. Bauer, S. E., Menon, S., Koch, D., Bond, T. C. and Tsigaridis, K.: A global modeling study on carbonaceous aerosol microphysical characteristics and radiative effects, Atmos. Chem. Phys., 10, 7439–7456, <a href="http://dx.doi.org/10.5194/acp-10-7439-2010">https://doi.org/10.5194/acp-10-7439-2010</a>, 2010. Bellouin, N., Boucher, O., Haywood, J., and Reddy, M. S.: Global estimate of aerosol direct radiative forcing from satellite measurements, Nature, 438, 1138–1141, 2005. Bellouin, N., Jones, A., Haywood, J., and Christopher, S. A.: Updated estimate of aerosol direct radiative forcing from satellite observations and comparison against the Hadley Centre climate model, J. Geophys. Res.-Atmos., 113, D10205, <a href="http://dx.doi.org/10.1029/2007jd009385">https://doi.org/10.1029/2007jd009385</a>, 2008. Bellouin, N., Rae, J., Jones, A., Johnson, C., Haywood, J., and Boucher, O.: Aerosol forcing in the Climate Model Intercomparison Project (CMIP5) simulations by HadGEM2-ES and the role of ammonium nitrate, J. Geophys. Res.-Atmos., 116, D20206, <a href="http://dx.doi.org/10.1029/2011jd016074">https://doi.org/10.1029/2011jd016074</a>, 2011. Bian, H., Chin, M., Rodriguez, J. M., Yu, H., Penner, J. E., and Strahan, S.: Sensitivity of aerosol optical thickness and aerosol direct radiative effect to relative humidity, Atmos. Chem. Phys., 9, 2375–2386, <a href="http://dx.doi.org/10.5194/acp-9-2375-2009">https://doi.org/10.5194/acp-9-2375-2009</a>, 2009. Bond, T. C. and Bergstrom, R. W.: Light absorption by carbonaceous particles: An investigative review, Aerosol Sci. Technol., 40, 27–67, 2006. Bond, T. C., Habib, G., and Bergstrom, R. W.: Limitations in the enhancement of visible light absorption due to mixing state, J. Geophys. Res.-Atmos., 111, D20211, <a href="http://dx.doi.org/10.1029/2006JD007315">https://doi.org/10.1029/2006JD007315</a>, 2006. Cappa, C. D., Onasch, T. B., Massoli, P., Worsnop, D. R., Bates, T. S., Cross, E. S., Davidovits, P., Hakala, J., Hayden, K. L., Jobson, B. T., Kolesar, K. R., Lack, D. A., Lerner, B. M., Li, S. M., Mellon, D., Nuaaman, I., Olfert, J. S., Petaja, T., Quinn, P. K., Song, C., Subramanian, R., Williams, E. J., and Zaveri, R. A.: Radiative Absorption Enhancements Due to the Mixing State of Atmospheric Black Carbon, Science, 337, 1078–1081, 2012. Chand, D., Wood, R., Anderson, T. L., Satheesh, S. K., and Charlson, R. J.: Satellite-derived direct radiative effect of aerosols dependent on cloud cover, Nature Geosci., 2, 181–184, 2009. Charlson, R. J., Langner, J., Rodhe, H., Leovy, C. B., and Warren, S. G.: Perturbation of the Northern-Hemisphere Radiative Balance by Backscattering from Anthropogenic Sulfate Aerosols, Tellus A – Dynam. Meteorol. Oceanogr., 43, 152–163, 1991. Chin, M., Ginoux, P., Kinne, S., Torres, O., Holben, B. N., Duncan, B. N., Martin, R. V., Logan, J. A., Higurashi, A. and Nakajima, T.: Tropospheric aerosol optical thickness from the GOCART model and comparisons with satellite and Sun photometer measurements, J. Atmos. Sci., 59, 461–483, 2002. Chin, M., Rood, R. B., Lin, S. J., Muller, J. F., and Thompson, A. M.: Atmospheric sulfur cycle simulated in the global model GOCART: Model description and global properties, J. Geophys. Res.-Atmos., 105, 24671–24687, 2000. Chung, C. E., Ramanathan, V., Kim, D., and Podgorny, I. A.: Global anthropogenic aerosol direct forcing derived from satellite and ground-based observations, J. Geophys. Res.-Atmos., 110, D24207, <a href="http://dx.doi.org/10.1029/2005JD006356">https://doi.org/10.1029/2005JD006356</a>, 2005. Chung, C. E., Lee, K., and Muller, D.: Effect of internal mixture on black carbon radiative forcing, Tellus B – Chem. Phys. Meteorol., 64, 1–13, 2012. Crosier, J., Allan, J. D., Coe, H., Bower, K. N., Formenti, P., and Williams, P. I.: Chemical composition of summertime aerosol in the Po Valley (Italy), northern Adriatic and Black Sea, Q. J. Roy. Meteorol. Soc., 133, 61–75, 2007. Feng, Y. and Penner, J. E.: Global modeling of nitrate and ammonium: Interaction of aerosols and tropospheric chemistry, J. Geophys. Res.-Atmos., 112, D01304, <a href="http://dx.doi.org/10.1029/2005JD006404">https://doi.org/10.1029/2005JD006404</a>, 2007. Fitzgerald, J. W.: Approximation Formulas For Equilibrium Size Of An Aerosol Particle As A Function Of Its Dry Size And Composition And Ambient Relative Humidity, J. Appl. Meteorol., 14, 1044–1049, 1975. Forster, P., Ramaswamy, V., Artaxo, P., Berntsen, T., Betts, R., Fahey, D. W., Haywood, J., Lean, J., Lowe, D. C., Myhre, G., Nganga, J., Prinn, R., Raga, G., Schulz, M., and Van Dorland, R., Changes in Atmospheric Constituents and in Radiative Forcing. In: Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA, 2007. Fuller, K. A., Malm, W. C., and Kreidenweis, S. M.: Effects of mixing on extinction by carbonaceous particles, J. Geophys. Res.-Atmos., 104, 15941–15954, 1999. Ghan, S. J., Liu, X., Easter, R. C., Zaveri, R., Rasch, P. J., Yoon, J.-H. and Eaton, B.: Toward a minimal representation of aerosols in climate models: Comparative decomposition of aerosol direct, semi-direct and indirect radiative forcing, J. Climate, 25, 6461–6476, <a href="http://dx.doi.org/10.1175/JCLI-D-11-00650.1">https://doi.org/10.1175/JCLI-D-11-00650.1</a>, 2012. Ginoux, P., Chin, M., Tegen, I., Prospero, J. M., Holben, B., Dubovik, O., and Lin, S. J.: Sources and distributions of dust aerosols simulated with the GOCART model, J. Geophys. Res.-Atmos., 106, 20255–20273, 2001. Granier, C., Bessagnet, B., Bond, T., D'Angiola, A., van der Gon, H. D., Frost, G. J., Heil, A., Kaiser, J. W., Kinne, S., Klimont, Z., Kloster, S., Lamarque, J. F., Liousse, C., Masui, T., Meleux, F., Mieville, A., Ohara, T., Raut, J. C., Riahi, K., Schultz, M. G., Smith, S. J., Thompson, A., van Aardenne, J., van der Werf, G. R., and van Vuuren, D. P.: Evolution of anthropogenic and biomass burning emissions of air pollutants at global and regional scales during the 1980–2010 period, Clim. Change, 109, 163–190, 2011. Haywood, J. M. and Shine, K. P.: The effect of anthropogenic sulfate and soot aerosol on the clear-sky planetary radiation budget, Geophys. Res. Lett., 22, 603–606, 1995. Haywood, J. M., Osborne, S. R., Francis, P. N., Keil, A., Formenti, P., Andreae, M. O., and Kaye, P. H.: The mean physical and optical properties of regional haze dominated by biomass burning aerosol measured from the C-130 aircraft during SAFARI 2000, J. Geophys. Res.-Atmos., 108, 8473, <a href="http://dx.doi.org/10.1029/2002/JD002226">https://doi.org/10.1029/2002/JD002226</a>, 2003. Heald, C. L., Coe, H., Jimenez, J. L., Weber, R. J., Bahreini, R., Middlebrook, A. M., Russell, L. M., Jolleys, M., Fu, T. M., Allan, J. D., Bower, K. N., Capes, G., Crosier, J., Morgan, W. T., Robinson, N. H., Williams, P. I., Cubison, M. J., DeCarlo, P. F., and Dunlea, E. J.: Exploring the vertical profile of atmospheric organic aerosol: comparing 17 aircraft field campaigns with a global model, Atmos. Chem. Phys., 11, 12673–12696, <a href="http://dx.doi.org/10.5194/acp-11-12673-2011">https://doi.org/10.5194/acp-11-12673-2011</a>, 2011. Holben, B. N., Eck, T. F., Slutsker, I., Tanre, D., Buis, J. P., Setzer, A., Vermote, E., Reagan, J. A., Kaufman, Y. J., Nakajima, T., Lavenu, F., Jankowiak, I., and Smirnov, A.: AERONET – A federated instrument network and data archive for aerosol characterization, Remote Sens. Environ., 66, 1–16, 1998. Hoyle, C. R., Myhre, G., Berntsen, T. K., and Isaksen, I. S. A.: Anthropogenic influence on SOA and the resulting radiative forcing, Atmos. Chem. Phys., 9, 2715–2728, <a href="http://dx.doi.org/10.5194/acp-9-2715-2009">https://doi.org/10.5194/acp-9-2715-2009</a>, 2009. Hoyle, C. R., Boy, M., Donahue, N. M., Fry, J. L., Glasius, M., Guenther, A., Hallar, A. G., Hartz, K. H., Petters, M. D., Petaja, T., Rosenoern, T., and Sullivan, A. P.: A review of the anthropogenic influence on biogenic secondary organic aerosol, Atmos. Chem. Phys., 11, 321–343, <a href="http://dx.doi.org/10.5194/acp-11-321-2011">https://doi.org/10.5194/acp-11-321-2011</a>, 2011. Huneeus, N., Schulz, M., Balkanski, Y., Griesfeller, J., Prospero, J., Kinne, S., Bauer, S., Boucher, O., Chin, M., Dentener, F., Diehl, T., Easter, R., Fillmore, D., Ghan, S., Ginoux, P., Grini, A., Horowitz, L., Koch, D., Krol, M. C., Landing, W., Liu, X., Mahowald, N., Miller, R., Morcrette, J. J., Myhre, G., Penner, J., Perlwitz, J., Stier, P., Takemura, T., and Zender, C. S.: Global dust model intercomparison in AeroCom phase I, Atmos. Chem. Phys., 11, 7781–7816, <a href="http://dx.doi.org/10.5194/acp-11-7781-2011">https://doi.org/10.5194/acp-11-7781-2011</a>, 2011. Jacobson, M. Z.: Investigating cloud absorption effects: Global absorption properties of black carbon, tar balls, and soil dust in clouds and aerosols, J. Geophys. Res.-Atmos., 117, D06205, <a href="http://dx.doi.org/10.1029/2011jd017218">https://doi.org/10.1029/2011jd017218</a>, 2012. Johnson, B. T., Osborne, S. R., Haywood, J. M., and Harrison, M. A. J.: Aircraft measurments of biomass burning aerosols over West Africa during DABEX, J. Geophys. Res.-Atmos., 113, D00C06, <a href="http://dx.doi.org/10.1029/2007JD009451">https://doi.org/10.1029/2007JD009451</a>, 2008. Kanakidou, M., Seinfeld, J. H., Pandis, S. N., Barnes, I., Dentener, F. J., Facchini, M. C., Van Dingenen, R., Ervens, B., Nenes, A., Nielsen, C. J., Swietlicki, E., Putaud, J. P., Balkanski, Y., Fuzzi, S., Horth, J., Moortgat, G. K., Winterhalter, R., Myhre, C. E. L., Tsigaridis, K., Vignati, E., Stephanou, E. G., and Wilson, J.: Organic aerosol and global climate modelling: a review, Atmos. Chem. Phys., 5, 1053–1123, <a href="http://dx.doi.org/10.5194/acp-5-1053-2005">https://doi.org/10.5194/acp-5-1053-2005</a>, 2005. Keil, A. and Haywood, J. M.: Solar radiative forcing by biomass burning aerosol particles during SAFARI 2000: A case study based on measured aerosol and cloud properties, J. Geophys. Res.-Atmos., 108, 8467, <a href="http://dx.doi.org/10.1029/2002JD002315">https://doi.org/10.1029/2002JD002315</a>, 2003. Kirkevåg, A., Iversen, T., Seland, Ø., Hoose, C., Kristjansson, J. E., Struthers, H., Ekman, A. M. L., Ghan, S., Griesfeller, J., Nilsson, E. D. and Schulz, M.: Aerosol-climate interactions in the Norwegian Earth System Model – Nor-ESM, Geosci. Model Dev. Discuss, 5, 2599–2685, <a href="http://dx.doi.org/10.5194/gmdd-5-2599-2012">https://doi.org/10.5194/gmdd-5-2599-2012</a>, 2012. Koch, D., Schmidt, G. A., and Field, C. V.: Sulfur, sea salt, and radionuclide aerosols in GISS ModelE, J. Geophys. Res.-Atmos., 111, D06206, <a href="http://dx.doi.org/10.1029/2004jd005550">https://doi.org/10.1029/2004jd005550</a>, 2006. Koch, D., Bond, T. C., Streets, D., Unger, N., and van der Werf, G. R.: Global impacts of aerosols from particular source regions and sectors, J. Geophys. Res.-Atmos., 112, D02205, <a href="http://dx.doi.org/10.1029/2005jd007024">https://doi.org/10.1029/2005jd007024</a>, 2007. Koch, D., Schulz, M., Kinne, S., McNaughton, C., Spackman, J. R., Balkanski, Y., Bauer, S., Berntsen, T., Bond, T. C., Boucher, O., Chin, M., Clarke, A., De Luca, N., Dentener, F., Diehl, T., Dubovik, O., Easter, R., Fahey, D. W., Feichter, J., Fillmore, D., Freitag, S., Ghan, S., Ginoux, P., Gong, S., Horowitz, L., Iversen, T., Kirkevag, A., Klimont, Z., Kondo, Y., Krol, M., Liu, X., Miller, R., Montanaro, V., Moteki, N., Myhre, G., Penner, J. E., Perlwitz, J., Pitari, G., Reddy, S., Sahu, L., Sakamoto, H., Schuster, G., Schwarz, J. P., Seland, O., Stier, P., Takegawa, N., Takemura, T., Textor, C., van Aardenne, J. A., and Zhao, Y.: Evaluation of black carbon estimations in global aerosol models, Atmos. Chem. Phys., 9, 9001–9026, <a href="http://dx.doi.org/10.5194/acp-9-9001-2009">https://doi.org/10.5194/acp-9-9001-2009</a>, 2009. Koffi, B., Schulz, M., Breon, F. M., Griesfeller, J., Winker, D., Balkanski, Y., Bauer, S., Berntsen, T., Chin, M. A., Collins, W. D., Dentener, F., Diehl, T., Easter, R., Ghan, S., Ginoux, P., Gong, S. L., Horowitz, L. W., Iversen, T., Kirkevåg, A., Koch, D., Krol, M., Myhre, G., Stier, P., and Takemura, T.: Application of the CALIOP layer product to evaluate the vertical distribution of aerosols estimated by global models: AeroCom phase I results, J. Geophys. Res.-Atmos., 117, D10201, <a href="http://dx.doi.org/10.1029/2011jd016858">https://doi.org/10.1029/2011jd016858</a>, 2012. Lamarque, J., Bond, T., Eyring, V., Granier, C., Heil, A., Klimont, Z., Lee, D., Liousse, C., Mieville, A., Owen, B., Schultz, M., Shindell, D., Smith, S., Stehfest, E., Van Aardenne, J., Cooper, O., Kainuma, M., Mahowald, N., McConnell, J., Naik, V., Riahi, K., and van Vuuren, D.: Historical (1850–2000) gridded anthropogenic and biomass burning emissions of reactive gases and aerosols: methodology and application, Atmos. Chem. Phys., 10, 7017–7039, <a href="http://dx.doi.org/10.5194/acp-10-7017-2010">https://doi.org/10.5194/acp-10-7017-2010</a>, 2010. Lamarque, J. F., Emmons, L. K., Hess, P. G., Kinnison, D. E., Tilmes, S., Vitt, F., Heald, C. L., Holland, E. A., Lauritzen, P. H., Neu, J., Orlando, J. J., Rasch, P. J., and Tyndall, G. K.: CAM-chem: description and evaluation of interactive atmospheric chemistry in the Community Earth System Model, Geosci. Model Dev., 5, 369–411, <a href="http://dx.doi.org/10.5194/gmd-5-369-2012">https://doi.org/10.5194/gmd-5-369-2012</a>, Liao, H. and Seinfeld, J. H.: Effect of clouds on direct aerosol radiative forcing of climate, J. Geophys. Res.-Atmos., 103, 3781–3788, 1998. Liao, H. and Seinfeld, J. H.: Global impacts of gas-phase chemistry-aerosol interactions on direct radiative forcing by anthropogenic aerosols and ozone, J. Geophys. Res., 110, D18208, <a href="http://dx.doi.org/10.1029/2005JD005907">https://doi.org/10.1029/2005JD005907</a>, 2005. Lin, G., Penner, J. E., Sillman, S., Taraborrelli, D., and Lelieveld, J.: Global modeling of SOA formation from dicarbonyls, epoxides, organic nitrates and peroxides, Atmos. Chem. Phys., 12, 4743–4774, <a href="http://dx.doi.org/10.5194/acp-12-4743-2012">https://doi.org/10.5194/acp-12-4743-2012</a>, 2012. Liu, X., Easter, R. C., Ghan, S. J., Zaveri, R., Rasch, P., Lamarque, J.-F., Gettelman, A., Morrison, H., Vitt, F., Conley, A., Park, S., Neale, R., Hannay, C., Ekman, A., Hess, P., Mahowald, N., Collins, W., Iacono, M., Bretherton, C., Flanner, M., and Mitchell, D.: Toward a minimal representation of aerosols in climate models: Description and evaluation in the Community Atmosphere Model CAM5., Geosci. Model Dev., 5, 709–739, <a href="http://dx.doi.org/10.5194/gmd-5-709-2012">https://doi.org/10.5194/gmd-5-709-2012</a>, 2012. Ma, X., Yu, F., and Luo, G.: Aerosol direct radiative forcing based on GEOS-Chem-APM and uncertainties, Atmos. Chem. Phys., 12, 5563–5581, <a href="http://dx.doi.org/10.5194/acp-12-5563-2012">https://doi.org/10.5194/acp-12-5563-2012</a>, 2012. Metzger, S., Dentener, F., Krol, M., Jeuken, A., and Lelieveld, J.: Gas/aerosol partitioning – 2. Global modeling results, J. Geophys. Res.-Atmos., 107, 4313, <a href="http://dx.doi.org/10.1029/2001JD001103">https://doi.org/10.1029/2001JD001103</a>, 2002. Mian Chin, Diehl, T., Dubovik, O., Eck, T. F., Holben, B. N., Sinyuk, A., and Streets, D. G.: Light absorption by pollution, dust, and biomass burning aerosols: a global model study and evaluation with AERONET measurements, Ann. Geophys., 27, 3439–3464, <a href="http://dx.doi.org/10.5194/angeo-27-3439-2009">https://doi.org/10.5194/angeo-27-3439-2009</a>, 2009. Myhre, G.: Consistency between satellite-derived and modeled estimates of the direct aerosol effect, Science, 325, 187–190, 2009. Myhre, G., Bellouin, N., Berglen, T. F., Berntsen, T. K., Boucher, O., Grini, A., Isaksen, I. S. A., Johnsrud, M., Mishchenko, M. I., Stordal, F., and Tanre, D.: Comparison of the radiative properties and direct radiative effect of aerosols from a global aerosol model and remote sensing data over ocean, Tellus B – Chem. Phys. Meteorol., 59, 115–129, 2007. Myhre, G., Berglen, T. F., Johnsrud, M., Hoyle, C. R., Berntsen, T. K., Christopher, S. A., Fahey, D. W., Isaksen, I. S. A., Jones, T. A., Kahn, R. A., Loeb, N., Quinn, P., Remer, L., Schwarz, J. P., and Yttri, K. E.: Modelled radiative forcing of the direct aerosol effect with multi-observation evaluation, Atmos. Chem. Phys., 9, 1365–1392, <a href="http://dx.doi.org/10.5194/acp-9-1365-2009">https://doi.org/10.5194/acp-9-1365-2009</a>, 2009. Putaud, J. P., Van Dingenen, R., Alastuey, A., Bauer, H., Birmili, W., Cyrys, J., Flentje, H., Fuzzi, S., Gehrig, R., Hansson, H. C., Harrison, R. M., Herrmann, H., Hitzenberger, R., Huglin, C., Jones, A. M., Kasper-Giebl, A., Kiss, G., Kousa, A., Kuhlbusch, T. A. J., Loschau, G., Maenhaut, W., Molnar, A., Moreno, T., Pekkanen, J., Perrino, C., Pitz, M., Puxbaum, H., Querol, X., Rodriguez, S., Salma, I., Schwarz, J., Smolik, J., Schneider, J., Spindler, G., ten Brink, H., Tursic, J., Viana, M., Wiedensohler, A. and Raes, F.: A European aerosol phenomenology-3: Physical and chemical characteristics of particulate matter from 60 rural, urban, and kerbside sites across Europe, Atmos. Environ., 44, 1308–1320, 2010. Quaas, J., Boucher, O., Bellouin, N., and Kinne, S.: Satellite-based estimate of the direct and indirect aerosol climate forcing, J. Geophys. Res.-Atmos., 113, D05204, <a href="http://dx.doi.org/10.1029/2007jd008962">https://doi.org/10.1029/2007jd008962</a>, 2008. Quinn, P. K. and Bates, T. S.: Regional aerosol properties: Comparisons of boundary layer measurements from ACE 1, ACE 2, aerosols99, INDOEX, ACE asia, TARFOX, and NEAQS, J. Geophys. Res.-Atmos., 110, D14202, <a href="http://dx.doi.org/10.1029/2004JD004755">https://doi.org/10.1029/2004JD004755</a>, 2005. Ramanathan, V. and Carmichael, G.: Global and regional climate changes due to black carbon, Nature Geosci., 1, 221–227, 2008. Randles, C. A., Kinne, S., Myhre, G., Schulz, M., Stier, P., Fischer, J., Doppler, L., Highwood, E., Ryder, C., Harris, B., Huttunen, J., Ma, Y., Pinker, R. T., Mayer, B., Neubauer, D., Hitzenberger, R., Oreopoulos, L., Lee, D., Pitari, G., Di Genova, G., Quaas, J., Rose, Fred G., Kato, S., Rumbold, S. T., Vardavas, I., Hatzianastassiou, N., Matsoukas, C., Yu, H., Zhang, F., Zhang, H., and Lu, P.: Intercomparison of shortwave radiative transfer schemes in global aerosol modeling: results from the AeroCom Radiative Transfer Experiment, Atmos. Chem. Phys. Discuss., 12, 32631–32706, <a href="http://dx.doi.org/10.5194/acpd-12-32631-2012">https://doi.org/10.5194/acpd-12-32631-2012</a>, 2012. Rasch, P. J., Feichter, J., Law, K., Mahowald, N., Penner, J., Benkovitz, C., Genthon, C., Giannakopoulos, C., Kasibhatla, P., Koch, D., Levy, H., Maki, T., Prather, M., Roberts, D. L., Roelofs, G. J., Stevenson, D., Stockwell, Z., Taguchi, S., Kritz, M., Chipperfield, M., Baldocchi, D., McMurry, P., Barrie, L., Balkansi, Y., Chatfield, R., Kjellstrom, E., Lawrence, M., Lee, H. N., Lelieveld, J., Noone, K. J., Seinfeld, J., Stenchikov, G., Schwartz, S., Walcek, C. and Williamson, D.: A comparison of scavenging and deposition processes in global models: results from the WCRP Cambridge Workshop of 1995, Tellus B – Chem. Phys. Meteorol., 52, 1025-1056, 2000. Remer, L. A., Kleidman, R. G., Levy, R. C., Kaufman, Y. J., Tanre, D., Mattoo, S., Martins, J. V., Ichoku, C., Koren, I., Yu, H. B., and Holben, B. N.: Global aerosol climatology from the MODIS satellite sensors, J. Geophys. Res.-Atmos., 113, D14S07, <a href="http://dx.doi.org/10.1029/2007jd009661">https://doi.org/10.1029/2007jd009661</a>, 2008. Robinson, A. L., Donahue, N. M., Shrivastava, M. K., Weitkamp, E. A., Sage, A. M., Grieshop, A. P., Lane, T. E., Pierce, J. R., and Pandis, S. N.: Rethinking organic aerosols: Semivolatile emissions and photochemical aging, Science, 315, 1259–1262, 2007. Samset, B. H. and Myhre, G.: Vertical dependence of black carbon, sulphate and biomass burning aerosol radiative forcing, Geophys. Res. Lett., 38, L24802, <a href="http://dx.doi.org/10.1029/2011gl049697">https://doi.org/10.1029/2011gl049697</a>, 2011. Samset, B. H., Myhre, G., Schulz, M., Balkanski, Y., Bauer, S., Berntsen, T. K., Bian, H., Bellouin, N., Diehl, T., Easter, R. C., Ghan, S. J., Iversen, T., Kinne, S., Kirkevåg, A., Lamarque, J.-F., Lin, G., Liu, X., Penner, J., Seland, Ø., Skeie, R. B., Stier, P., Takemura, T., Tsigaridis, K., and Zhang, K.: Black carbon vertical profiles strongly affect its radiative forcing uncertainty, Atmos. Chem. Phys. Discuss., 12, 28929–28953, <a href="http://dx.doi.org/https://doi.org/10.5194/acpd-12-28929-2012">https://doi.org/10.5194/acpd-12-28929-2012</a>, 2012. Schulz, M.: Constraining model estimates of the aerosol radiative forcing. Habilitation Thesis Thesis, Université Pierre et Marie Curie, Paris VI, 2007. Schulz, M., Textor, C., Kinne, S., Balkanski, Y., Bauer, S., Berntsen, T., Berglen, T., Boucher, O., Dentener, F., Guibert, S., Isaksen, I. S. A., Iversen, T., Koch, D., Kirkevag, A., Liu, X., Montanaro, V., Myhre, G., Penner, J. E., Pitari, G., Reddy, S., Seland, O., Stier, P. and Takemura, T.: Radiative forcing by aerosols as derived from the AeroCom present-day and pre-industrial simulations, Atmos. Chem. Phys., 6, 5225–5246, <a href="http://dx.doi.org/10.5194/acp-6-5225-2006">https://doi.org/10.5194/acp-6-5225-2006</a>, 2006. Schwarz, J. P., Spackman, J. R., Gao, R. S., Watts, L. A., Stier, P., Schulz, M., Davis, S. M., Wofsy, S. C., and Fahey, D. W.: Global-scale black carbon profiles observed in the remote atmosphere and compared to models, Geophys. Res. Lett., 37, L18812, <a href="http://dx.doi.org/10.1029/2010gl044372">https://doi.org/10.1029/2010gl044372</a>, 2010. Seland, Ø., Iversen, T., Kirkevåg, A. and Storelvmo, T.: Aerosol-climate interactions in the CAM-Oslo atmospheric GCM and investigation of associated basic shortcomings, Tellus A – Dynam. Meteorol. Oceanogr., 60, 459–491, 2008. Shindell, D. T., Lamarque, J.-F., Schulz, M., Flanner, M., Jiao, C., Chin, M., Young, P., Lee, Y. H., Rotstayn, L., Milly, G., Faluvegi, G., Balkanski, Y., Collins, W. J., Conley, A. J., Dalsoren, S., Easter, R., Ghan, S., Horowitz, L., Liu, X., Myhre, G., Nagashima, T., Naik, V., Rumbold, S., Skeie, R., Sudo, K., Szopa, S., Takemura, T., Voulgarakis, A., and Yoon, J.-H.: Radiative forcing in the ACCMIP historical and future climate simulations, Atmos. Chem. Phys. Discuss., 12, 21105–21210, <a href="http://dx.doi.org/10.5194/acpd-12-21105-2012">https://doi.org/10.5194/acpd-12-21105-2012</a>, 2012. Skeie, R. B., Berntsen, T. K., Myhre, G., Tanaka, K., Kvalevag, M. M., and Hoyle, C. R.: Anthropogenic radiative forcing time series from pre-industrial times until 2010, Atmos. Chem. Phys., 11, 11827–11857, <a href="http://dx.doi.org/10.5194/acp-11-11827-2011">https://doi.org/10.5194/acp-11-11827-2011</a>, 2011. Smith, G. L., Priestley, K. J., Loeb, N. G., Wielicki, B. A., Charlock, T. P., Minnis, P., Doelling, D. R., and Rutan, D. A.: Clouds and Earth Radiant Energy System (CERES), a review: Past, present and future, Adv. Space Res., 48, 254–263, 2011. Spracklen, D. V., Jimenez, J. L., Carslaw, K. S., Worsnop, D. R., Evans, M. J., Mann, G. W., Zhang, Q., Canagaratna, M. R., Allan, J., Coe, H., McFiggans, G., Rap, A., and Forster, P.: Aerosol mass spectrometer constraint on the global secondary organic aerosol budget, Atmos. Chem. Phys., 11, 12109–12136, <a href="http://dx.doi.org/10.5194/acp-11-12109-2011">https://doi.org/10.5194/acp-11-12109-2011</a>, 2011. Stier, P., Feichter, J., Kinne, S., Kloster, S., Vignati, E., Wilson, J., Ganzeveld, L., Tegen, I., Werner, M., Balkanski, Y., Schulz, M., Boucher, O., Minikin, A., and Petzold, A.: The aerosol-climate model ECHAM5-HAM, Atmos. Chem. Phys., 5, 1125–1156, <a href="http://dx.doi.org/10.5194/acp-5-1125-2005">https://doi.org/10.5194/acp-5-1125-2005</a>, 2005. Stier, P., Schutgens, N. A. J., Bian, H., Boucher, O., Chin, M., Ghan, S., Huneeus, N., Kinne, S., Lin, G., Myhre, G., Penner, J. E., Randles, C., Samset, B., Schulz, M., Yu, H., and Zhou, C.: Host model uncertainties in aerosol radiative forcing estimates: results from the AeroCom prescribed intercomparison study, Atmos. Chem. Phys. Discuss., 12, 25487–25549, <a href="http://dx.doi.org/10.5194/acpd-12-25487-2012">https://doi.org/10.5194/acpd-12-25487-2012</a>, 2012. Szopa, S., Balkanski, Y., Cozic, A., Déandreis, C., Dufresne, J.-L., Hauglustaine, D., Lathière, J., Schulz, M., Vuolo, R., Yan, N., Marchand, M., Bekki, S., Cugnet, D., Idelkadi, A., Denvil, S., Foujols, M.-A., Caubel, A., and Fortems-Cheiney, A.: Aerosol and Ozone changes as forcing for Climate Evolution between 1850 and 2100, Clim. Dynam., in press, <a href="http://dx.doi.org/10.1007/s00382-012-1408-y">https://doi.org/10.1007/s00382-012-1408-y</a>, 2012. Takemura, T., Nakajima, T., Dubovik, O., Holben, B. N., and Kinne, S.: Single-scattering albedo and radiative forcing of various aerosol species with a global three-dimensional model, J. Climate, 15, 333–352, 2002. Takemura, T., Nozawa, T., Emori, S., Nakajima, T. Y., and Nakajima, T.: Simulation of climate response to aerosol direct and indirect effects with aerosol transport-radiation model, J. Geophys. Res.-Atmos., 110, D02202, <a href="http://dx.doi.org/10.1029/2004jd005029">https://doi.org/10.1029/2004jd005029</a>, 2005. Takemura, T., Egashira, M., Matsuzawa, K., Ichijo, H., O'Ishi, R., and Abe-Ouchi, A.: A simulation of the global distribution and radiative forcing of soil dust aerosols at the Last Glacial Maximum, Atmos. Chem. Phys., 9, 3061–3073, <a href="http://dx.doi.org/10.5194/acp-9-3061-2009">https://doi.org/10.5194/acp-9-3061-2009</a>, 2009. Textor, C., Schulz, M., Guibert, S., Kinne, S., Balkanski, Y., Bauer, S., Berntsen, T., Berglen, T., Boucher, O., Chin, M., Dentener, F., Diehl, T., Easter, R., Feichter, H., Fillmore, D., Ghan, S., Ginoux, P., Gong, S., Kristjansson, J. E., Krol, M., Lauer, A., Lamarque, J. F., Liu, X., Montanaro, V., Myhre, G., Penner, J., Pitari, G., Reddy, S., Seland, O., Stier, P., Takemura, T. and Tie, X.: Analysis and quantification of the diversities of aerosol life cycles within AeroCom, Atmos. Chem. Phys., 6, 1777–1813, <a href="http://dx.doi.org/10.5194/acp-6-1777-2006">https://doi.org/10.5194/acp-6-1777-2006</a>, 2006. Textor, C., Schulz, M., Guibert, S., Kinne, S., Balkanski, Y., Bauer, S., Berntsen, T., Berglen, T., Boucher, O., Chin, M., Dentener, F., Diehl, T., Feichter, J., Fillmore, D., Ginoux, P., Gong, S., Grini, A., Hendricks, J., Horowitz, L., Huang, P., Isaksen, I. S. A., Iversen, T., Kloster, S., Koch, D., Kirkevag, A., Kristjansson, J. E., Krol, M., Lauer, A., Lamarque, J. F., Liu, X., Montanaro, V., Myhre, G., Penner, J. E., Pitari, G., Reddy, M. S., Seland, O., Stier, P., Takemura, T., and Tie, X.: The effect of harmonized emissions on aerosol properties in global models – an AeroCom experiment, Atmos. Chem. Phys., 7, 4489–4501, <a href="http://dx.doi.org/10.5194/acp-7-4489-2007">https://doi.org/10.5194/acp-7-4489-2007</a>, 2007. Thomson, A. M., Calvin, K. V., Smith, S. J., Kyle, G. P., Volke, A., Patel, P., Delgado-Arias, S., Bond-Lamberty, B., Wise, M. A., Clarke, L. E., and Edmonds, J. A.: RCP4.5: a pathway for stabilization of radiative forcing by 2100, Clim. Change, 109, 77–94, 2011. Tsigaridis, K., Krol, M., Dentener, F. J., Balkanski, Y., Lathiere, J., Metzger, S., Hauglustaine, D. A., and Kanakidou, M.: Change in global aerosol composition since preindustrial times, Atmos. Chem. Phys., 6, 5143–5162, <a href="http://dx.doi.org/10.5194/acp-6-5143-2006">https://doi.org/10.5194/acp-6-5143-2006</a>, 2006. Tsigaridis, K., Koch, D. M., and Menon, S.: Uncertainties and importance of sea-spray composition on aerosol direct and indirect effects, J. Geophys. Res., 118, 220–235, <a href="http://dx.doi.org/10.1029/2012JD018165">https://doi.org/10.1029/2012JD018165</a>, 2013. Vignati, E., Wilson, J., and Stier, P.: M7: An efficient size-resolved aerosol microphysics module for large-scale aerosol transport models, J. Geophys. Res.-Atmos., 109, D22202, <a href="http://dx.doi.org/10.1029/2003JD004485">https://doi.org/10.1029/2003JD004485</a>, 2004. Wang, M. and Penner, J. E.: Aerosol indirect forcing in a global model with particle nucleation, Atmos. Chem. Phys., 9, 239–260, <a href="http://dx.doi.org/10.5194/acp-9-239-2009">https://doi.org/10.5194/acp-9-239-2009</a>, 2009. Wielicki, B. A., Barkstrom, B. R., Harrison, E. F., Lee, R. B., Smith, G. L., and Cooper, J. E.: Clouds and the earth's radiant energy system (CERES): An earth observing system experiment, B. Am. Meteorol. Soc., 77, 853–868, 1996. Xu, L. and Penner, J. E.: Global simulations of nitrate and ammonium aerosols and their radiative effects, Atmos. Chem. Phys., 12, 9479–9504, <a href="http://dx.doi.org/10.5194/acp-12-9479-2012">https://doi.org/10.5194/acp-12-9479-2012</a>, 2012. Yu, F.: A secondary organic aerosol formation model considering successive oxidation aging and kinetic condensation of organic compounds: global scale implications, Atmos. Chem. Phys., 11, 1083–1099, <a href="http://dx.doi.org/10.5194/acp-11-1083-2011">https://doi.org/10.5194/acp-11-1083-2011</a>, 2011. Yu, F. and Luo, G.: Simulation of particle size distribution with a global aerosol model: contribution of nucleation to aerosol and CCN number concentrations, Atmos. Chem. Phys., 9, 7691–7710, <a href="http://dx.doi.org/10.5194/acp-9-7691-2009">https://doi.org/10.5194/acp-9-7691-2009</a>, 2009. Zarzycki, C. M. and Bond, T. C.: How much can the vertical distribution of black carbon affect its global direct radiative forcing?, Geophys. Res. Lett., 37, L20807, <a href="http://dx.doi.org/10.1029/2010gl044555">https://doi.org/10.1029/2010gl044555</a>, 2010. Zhang, H., Wang, Z. L., Wang, Z. Z., Liu, Q. X., Gong, S. L., Zhang, X. Y., Shen, Z. P., Lu, P., Wei, X. D., Che, H. Z., and Li, L.: Simulation of direct radiative forcing of aerosols and their effects on East Asian climate using an interactive AGCM-aerosol coupled system, Clim. Dynam., 38, 1675–1693, 2012a. Zhang, K., O'Donnell, D., Kazil, J., Stier, P., Kinne, S., Lohmann, U., Ferrachat, S., Croft, B., Quaas, J., Wan, H., Rast, S., and Feichter, J.: The global aerosol-climate model ECHAM-HAM, version 2: sensitivity to improvements in process representations, Atmos. Chem. Phys., 12, 8911–8949, <a href="http://dx.doi.org/10.5194/acp-12-8911-2012">https://doi.org/10.5194/acp-12-8911-2012</a>, 2012b.