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ROBERTS, GREG

Associate Research Scientist

CR1 / Centre National de Recherche Scientifique

Degrees:

• B.S., Kansas State University
• B.A., Kansas State University
• M.S., California Institute of Technology
• Ph.D., California Institute of Technology

Research Interests:

• Aerosol chemistry and physics
• Cloud condensation nuclei (CCN)
• Aerosol-clouds-radiometric interactions and climate
• Autonomous unmanned aerial vehicles in atmospheric sciences
• Miniaturized instrumentation

Honors and Awards:

• US Patent No. 7,656,510: A Continuous-Flow Longitudinal Thermal-Gradient Diffusion Chamber. Issued February 2, 2010.
• Visiting Scientist, Centre National de Recherches Météorologiques, Toulouse, France, 2008.

1. Sorensen, C. and G. Roberts, The prefactor of fractal aggregates. J. Colloid Interface Sci., 186: p. 447-452, 1997.

2. Kettle, A.J., M.O. Andreae, D. Amouroux, T.W. Andreae, T.S. Bates, H. Berresheim, H. Bingemer, R. Boniforti, M.A.J. Curran, G.R. DiTullio, G. Helas, G.B. Jones, M.D. Keller, R.P. Kiene, C. Leck, M. Levasseur, G. Malin, M. Maspero, P. Matrai, A.R. McTaggart, N. Mihalopoulos, B.C. Nguyen, A. Novo, J.P. Putaud, S. Rapsomanikis, G. Roberts, G. Schebeske, S. Sharma, R. Simo, R. Staubes, S. Turner, and G. Uher, A global database of sea surface dimethylsulfide (DMS) measurements and a procedure to predict sea surface DMS as a function of latitude, longitude, and month. Global Biogeochem Cy, 13(2): p. 399-444, 1999.

3. Kubatova, A., R. Vermeylen, M. Claeys, J. Cafmeyer, W. Maenhaut, G. Roberts, and P. Artaxo, Carbonaceous aerosol characterization in the Amazon basin, Brazil: novel dicarboxylic acids and related compounds. Atmos Environ, 34(29-30): p. 5037-5051, 2000.

4. Formenti, P., M.O. Andreae, L. Lange, G. Roberts, J. Cafmeyer, I. Rajta, W. Maenhaut, B.N. Holben, P. Artaxo, and J. Lelieveld, Saharan dust in Brazil and Suriname during the Large-Scale Biosphere-Atmosphere Experiment in Amazonia (LBA) - Cooperative LBA Regional Experiment (CLAIRE) in March 1998. J Geophys Res, 106(D14): p. 14919-14934, 2001.

5. Roberts, G.C., M.O. Andreae, W. Maenhaut, and M.T. Fernandez-Jimenez, Composition and sources of aerosol in a central African rain forest during the dry season. J Geophys Res, 106(D13): p. 14423-14434, 2001.

6. Roberts, M.C., M.O. Andreae, J.C. Zhou, and P. Artaxo, Cloud condensation nuclei in the Amazon Basin: "Marine" conditions over a continent? Geophys Res Lett, 28(14): p. 2807-2810, 2001.

7. Amouroux, D., G. Roberts, S. Rapsomanikis, and M.O. Andreae, Biogenic gas (CH4, N2O, DMS) emission to the atmosphere from near-shore and shelf waters of the north-western Black Sea. Estuar Coast Shelf S, 54(3): p. 575-587, 2002.

8. Graham, B., O.L. Mayol-Bracero, P. Guyon, G.C. Roberts, S. Decesari, M.C. Facchini, P. Artaxo, W. Maenhaut, P. Koll, and M.O. Andreae, Water-soluble organic compounds in biomass burning aerosols over Amazonia - 1. Characterization by NMR and GC-MS. J Geophys Res, 107(D20): p. Art. No. 8047, 2002.

9. Mayol-Bracero, O.L., P. Guyon, B. Graham, G. Roberts, M.O. Andreae, S. Decesari, M.C. Facchini, S. Fuzzi, and P. Artaxo, Water-soluble organic compounds in biomass burning aerosols over Amazonia - 2. Apportionment of the chemical composition and importance of the polyacidic fraction. J Geophys Res, 107(D20): p. Art. No. 8091, 2002.

10. Roberts, G.C., P. Artaxo, J.C. Zhou, E. Swietlicki, and M.O. Andreae, Sensitivity of CCN spectra on chemical and physical properties of aerosol: A case study from the Amazon Basin. J Geophys Res, 107(D20): p. Art. No. 8070, 2002.

11. Williams, E., D. Rosenfeld, N. Madden, J. Gerlach, N. Gears, L. Atkinson, N. Dunnemann, G. Frostrom, M. Antonio, B. Biazon, R. Camargo, H. Franca, A. Gomes, M. Lima, R. Machado, S. Manhaes, L. Nachtigall, H. Piva, W. Quintiliano, L. Machado, P. Artaxo, G. Roberts, N. Renno, R. Blakeslee, J. Bailey, D. Boccippio, A. Betts, D. Wolff, B. Roy, J. Halverson, T. Rickenbach, J. Fuentes, and E. Avelino, Contrasting convective regimes over the Amazon: Implications for cloud electrification. J Geophys Res, 107(D20): p. Art. No. 8082, 2002.

12. Guyon, P., O. Boucher, B. Graham, J. Beck, O.L. Mayol-Bracero, G.C. Roberts, W. Maenhaut, P. Artaxo, and M.O. Andreae, Refractive index of aerosol particles over the Amazon tropical forest during LBA-EUSTACH 1999. J Aerosol Sci, 34(7): p. 883-907, 2003.

13. Guyon, P., B. Graham, J. Beck, O. Boucher, E. Gerasopoulos, O.L. Mayol-Bracero, G.C. Roberts, P. Artaxo, and M.O. Andreae, Physical properties and concentration of aerosol particles over the Amazon tropical forest during background and biomass burning conditions. Atmos Chem Phys, 3: p. 951-967, 2003.

14. Guyon, P., B. Graham, G.C. Roberts, O.L. Mayol-Bracero, W. Maenhaut, P. Artaxo, and M.O. Andreae, In-canopy gradients, composition, sources, and optical properties of aerosol over the Amazon forest. J Geophys Res, 108(D18): p. Art. No. 4591, 2003.

15. Roberts, G.C. and M.O. Andreae, Reply to "Comment on Cloud condensation nuclei in the Amazon Basin: "Marine" conditions over a continent?" by P. J. Crutzen et al. Geophys Res Lett, 30(2): p. Art. No. 1079, 2003.

16. Roberts, G.C., A. Nenes, J.H. Seinfeld, and M.O. Andreae, Impact of biomass burning on cloud properties in the Amazon Basin. J Geophys Res, 108(D2): p. Art. No. 4062, 2003.

17. VanReken, T.M., T.A. Rissman, G.C. Roberts, V. Varutbangkul, H.H. Jonsson, R.C. Flagan, and J.H. Seinfeld, Toward aerosol/cloud condensation nuclei (CCN) closure during CRYSTAL-FACE. J Geophys Res, 108(D20): p. Art. No. 4633, 2003.

18. Conant, W.C., T.M. VanReken, T.A. Rissman, V. Varutbangkul, H.H. Jonsson, A. Nenes, J.L. Jimenez, A.E. Delia, R. Bahreini, G.C. Roberts, R.C. Flagan, and J.H. Seinfeld, Aerosol-cloud drop concentration closure in warm cumulus. J Geophys Res, 109(D13): p. Art. No. D13204, 2004.

19. Guyon, P., B. Graham, G.C. Roberts, O.L. Mayol-Bracero, W. Maenhaut, P. Artaxo, and M.O. Andreae, Sources of optically active aerosol particles over the Amazon forest. Atmos Environ, 38(7): p. 1039-1051, 2004.

20. Rissler, J., E. Swietlicki, J. Zhou, G. Roberts, M.O. Andreae, L.V. Gatti, and P. Artaxo, Physical properties of the sub-micrometer aerosol over the Amazon rain forest during the wet-to-dry season transition - comparison of modeled and measured CCN concentrations. Atmos Chem Phys, 4: p. 2119-2143, 2004.

21. Roberts, G. and A. Nenes, A continuous-flow streamwise thermal-gradient CCN chamber for airborne measurements. Aero Sci Tech, (39): p. 206-221, 2005.

22. Roberts, G., G. Mauger, O. Hadley, and V. Ramanathan, North American and Asian aerosols over the Eastern Pacific Ocean and their role in regulating cloud condensation nuclei. J Geophys Res, 111: p. Art. No. D13205, 2006.

23. Wilcox, E., G. Roberts, and V. Ramanathan, Influence of aerosols on the shortwave cloud radiative forcing from North Pacific oceanic clouds: Results from the Cloud Indirect Forcing Experiment (CIFEX). Geophys Res Lett, 33: p. doi: 10.1029/2006GL027150, 2006.

24. Hadley, O., V. Ramanathan, G. Carmichael, Y. Tang, C. Corrigan, G. Roberts, and G. Mauger, Trans-Pacific transport of black carbon and fine aerosols (D < 2.5 µ m) into North America. J Geophys Res, 112: p. Art. No. D05309, 2007.

25. Ramana, M., V. Ramanathan, D. Kim, G. Roberts, and C. Corrigan, Albedo, Atmospheric Solar Absorption, and Atmospheric Heating rate measurements with light weight Autonomous stacked UAVs. in press, Q J Roy Meteor Soc, 2007.

26. Ramanathan, V., M. Ramana, G. Roberts, D. Kim, C. Corrigan, C. Chung, and D. Winker, Warming trends in Asia amplified by brown cloud solar absorption. Nature, 448: p. 575-578, 2007.

27. Roberts, G., V. Ramanathan, C. Corrigan, M. Ramana, and D. Kim, Simultaneous observations of aerosol-cloud-albedo interactions with three stacked unmanned aerial vehicles. submitted to PNAS, 2007.

28. Yum, S., G. Roberts, J. Kim, K. Song, and D. Kim, Submicron aerosol size distributions and cloud condensation nuclei concentrations measured at Gosan, Korea during the ABC-EAREX 2005. J Geophys Res, D112: p. doi:10.1029/2006JD008212, 2007.

29. Corrigan, C., G. Roberts, M. Ramana, D. Kim, and V. Ramanathan, Capturing Vertical Profiles of Aerosols and Black Carbon over the Indian Ocean using Autonomous Unmanned Aerial Vehicles. Atmos Chem Phys, 8: p. 737-747, 2008.

30. Furutani, H., M. Dall'osto, G.C. Roberts, and K.A. Prather, Assessment of the relative importance of atmospheric aging on CCN activity derived from field observations. Atmos Environ, 42(13): p. 3130-3142, 2008.

31. Roberts, G., M. Ramana, C. Corrigan, D. Kim, and V. Ramanathan, Simultaneous observations of aerosol-cloud-albedo interactions with unmanned aircraft. PNAS, 105: p. 7370-7375, 2008.

32. Shinozuka, Y., A.D. Clarke, P.F. DeCarlo, J.L. Jimenez, E.J. Dunlea, G.C. Roberts, J.M. Tomlinson, D.R. Collins, S.G. Howell, V.N. Kapustin, C.S. McNaughton, and J. Zhou, Aerosol optical properties relevant to regional remote sensing of CCN activity and links to their organic mass fraction: airborne observations over Central Mexico and the US West Coast during MILAGRO/INTEX-B. Atmos Chem Phys, 9(18): p. 6727-6742, 2009.

33. Stith, J.L., V. Ramanathan, W.A. Cooper, G.C. Roberts, P.J. DeMott, G. Carmichael, C.D. Hatch, B. Adhikary, C.H. Twohy, D.C. Rogers, D. Baumgardner, A.J. Prenni, T. Campos, R. Gao, J. Anderson, and Y. Feng, An overview of aircraft observations from the Pacific Dust Experiment campaign. J Geophys Res, 114: p. doi: 10.1029/2008JD010924, 2009.

34. Sullivan, R.C., M.J.K. Moore, M.D. Petters, S.M. Kreidenweis, G.C. Roberts, and K.A. Prather, Effect of chemical mixing state on the hygroscopicity and cloud nucleation properties of calcium mineral dust particles. Atmos Chem Phys, 9(10): p. 3303-3316, 2009.

35. Sullivan, R.C., M.J.K. Moore, M.D. Petters, S.M. Kreidenweis, G.C. Roberts, and K.A. Prather, Timescale for hygroscopic conversion of calcite mineral particles through heterogeneous reaction with nitric acid. Phys Chem Chem Phys, 11(36): p. 7826-7837, 2009.

36. Crumeyrolle, S., H. Manninen, K. Sellegri, G. Roberts, L. Gomes, M. Kulmala, R. Weigel, P. Laj, and A. Schwarzenboeck, New particle formation events measured on board the ATR-42 aircraft during the EUCAARI campaign. Atmos. Chem. Phys., 10(doi:10.5194/acp-10-6721-2010): p. 6721-6735, 2010.

37. Martin, S.T., M.O. Andreae, P. Artaxo, D. Baumgardner, Q. Chen, A.H. Goldstein, A. Guenther, C.L. Heald, O.L. Mayol-Bracero, P.H. McMurry, T. Pauliquevis, U. Poschl, K.A. Prather, G.C. Roberts, S.R. Saleska, M.A.S. Dias, D.V. Spracklen, E. Swietlicki, and I. Trebs, Sources and Properties of Amazonian Aerosol Particles. Rev Geophys, 48: p. doi: 8755-1209/10/2008RG000280, 2010.

38. Roberts, G., D. Day, L. Russell, E. Dunlea, J. Jimenez, J. Tomlinson, D. Collins, Y. Shinozuka, and A. Clarke, Characterization of particle cloud droplet activity and composition in the free troposphere and the boundary layer during INTEX-B. Atmos. Chem. Phys., doi:10.5194/acp-10-6627-2010(10): p. 6627–6644, 2010.

39. Sullivan, R., M. Moore, M. Petters, S. Kreidenweis, O. Qafoku, A. Laskin, G. Roberts, and K. Prather, Impact of particle generation method on the apparent hygroscopicity of insoluble mineral particles. Aero Sci Tech, (10.1080/02786826.2010.497514): p. 830-846, 2010.