Publications of G. Helas

Dusek, U.; Frank, G. P.; Massling, A.; Zeromskiene, K.; Iinuma, Y.; Schmid, O.; Helas, G.; Hennig, T.; Wiedensohler, A.; Andreae, M. O.: Water uptake by biomass burning aerosol at sub- and supersaturated conditions: closure studies and implications for the role of organics. Atmospheric Chemistry and Physics 11 (18), pp. 9519 - 9532 (2011)

Pöschl, U.; Martin, S. T.; Sinha, B.; Chen, Q.; Gunthe, S. S.; Huffman, J. A.; Borrmann, S.; Farmer, D. K.; Garland, R. M.; Helas, G. et al.; Jimenez, J. L.; King, S. M.; Manzi, A.; Mikhailov, E.; Pauliquevis, T.; Petters, M. D.; Prenni, A. J.; Roldin, P.; Rose, D.; Schneider, J.; Su, H.; Zorn, S. R.; Artaxo, P.; Andreae, M. O.: Rainforest Aerosols as Biogenic Nuclei of Clouds and Precipitation in the Amazon. Science 329 (5998), pp. 1513 - 1516 (2010)

Röckmann, T.; Gómez Álvarez, C. X.; Walter, S.; van der Veen, C.; Wollny, A. G.; Gunthe, S. S.; Helas, G.; Pöschl, U.; Keppler, F.; Greule, M. et al.; Brand, W. A.: Isotopic composition of H₂ from wood burning: Dependency on combustion efficiency, moisture content, and δD of local precipitation. Journal of Geophysical Research-Atmospheres 115, D17308 (2010)

Chou, C.; Formenti, P.; Maille, M.; Ausset, P.; Helas, G.; Harrison, M.; Osborne, S.: Size distribution, shape, and composition of mineral dust aerosols collected during the African Monsoon Multidisciplinary Analysis Special Observation Period 0: Dust and Biomass-Burning Experiment field campaign in Niger, January 2006. Journal of Geophysical Research-Atmospheres 113 (D17), D00C10 (2008)

Worringen, A.; Ebert, M.; Trautmann, T.; Weinbruch, S.; Helas, G.: Optical properties of internally mixed ammonium sulfate and soot particles-a study of individual aerosol particles and ambient aerosol populations. Applied Optics 47 (21), pp. 3835 - 3845 (2008)

Helas, G.; Andreae, M. O.: Surface features on Sahara soil dust particles made visible by atomic force microscope (AFM) phase images. Atmospheric Measurement Techniques 1 (1), pp. 1 - 8 (2008)

Hungershoefer, K.; Zeromskiene, K.; Iinuma, Y.; Helas, G.; Trentmann, J.; Trautmann, T.; Parmar, R. S.; Wiedensohler, A.; Andreae, M. O.; Schmid, O.: Modelling the optical properties of fresh biomass burning aerosol produced in a smoke chamber: results from the EFEU campaign. Atmospheric Chemistry and Physics 8, pp. 3427 - 3429 (2008)

Parmar, R. S.; Welling, M.; Andreae, M. O.; Helas, G.: Water vapor release from biomass combustion. Atmospheric Chemistry and Physics 8 (20), pp. 6147 - 6153 (2008)

Winkler, H.; Formenti, P.; Esterhuyse, D. J.; Swap, R. J.; Helas, G.; Annegarn, H. J.; Andreae, M. O.: Evidence for large-scale transport of biomass burning aerosols from sunphotometry at a remote South African site. Atmospheric Environment 42, pp. 5569 - 5578 (2008)

Gwaze, P.; Annegarn, H. J.; Huth, J.; Helas, G.: Comparison of particle sizes determined with impactor, AFM and SEM. Atmospheric Research 86 (2), pp. 93 - 104 (2007)

Iinuma, Y.; Brüggemann, E.; Gnauk, T.; Müller, K.; Andreae, M. O.; Helas, G.; Parmar, R.; Herrmann, H.: Source characterization of biomass burning particles: The combustion of selected European conifers, African hardwood, savanna grass, and German and Indonesian peat. Journal of Geophysical Research-Atmospheres 112 (D8), D08209 (2007)

Gwaze, P.; Helas, G.; Annegarn, H. J.; Huth, J.; Piketh, S. J.: Physical, chemical and optical properties of aerosol particles collected over Cape Town during winter haze episodes. South African Journal of Science 103 (1-2), pp. 35 - 43 (2007)

Schneider, J.; Weimer, S.; Drewnick, F.; Borrmann, S.; Helas, G.; Gwaze, P.; Schmid, O.; Andreae, M. O.; Kirchner, U.: Mass spectrometric analysis and aerodynamic properties of various types of combustion-related aerosol particles. International Journal of Mass Spectrometry 258 (1-3), pp. 37 - 49 (2006)

Elias, T.; Silva, A. M.; Belo, N.; Pereira, S.; Formenti, P.; Helas, G.; Wagner, F.: Aerosol extinction in a remote continental region of the Iberian Peninsula during summer. Journal of Geophysical Research-Atmospheres 111 (D14), D14204 (2006)

Gwaze, P.; Schmid, O.; Annegarn, H. J.; Andreae, M. O.; Huth, J.; Helas, G.: Comparison of three methods of fractal analysis applied to soot aggregates from wood combustion. Journal of Aerosol Science 37 (7), pp. 820 - 838 (2006)

Chand, D.; Schmid, O.; Gwaze, P.; Parmar, R. S.; Helas, G.; Zeromskiene, K.; Wiedensohler, A.; Massling, A.; Andreae, M. O.: Laboratory measurements of smoke optical properties from the burning of Indonesian peat and other types of biomass. Geophysical Research Letters 32 (12), L12819 (2005)

Dusek, U.; Frank, G. P.; Helas, G.; Iinuma, Y.; Zeromskiene, K.; Gwaze, P.; Hennig, T.; Massling, A.; Schmid, O.; Herrmann, H. et al.; Wiedensohler, A.; Andreae, M. O.: "Missing" cloud condensation nuclei in peat smoke. Geophysical Research Letters 32 (11), L11802 (2005)

Trebs, I.; Metzger, S.; Meixner, F. X.; Helas, G. N.; Hoffer, A.; Rudich, Y.; Falkovich, A. H.; Moura, M. A. L.; da Silva, R. S.; Artaxo, P. et al.; Slanina, J.; Andreae, M. O.: The NH₄⁺ – NO₃^– – Cl^– – SO₄^2– – H₂O aerosol system and its gas phase precursors at a pasture site in the Amazon Basin: How relevant are mineral cations and soluble organic acids? Journal of Geophysical Research-Atmospheres 110 (D7), D07303 (2005)

Schnaiter, M.; Schmid, O.; Petzold, A.; Fritzsche, L.; Klein, K. F.; Andreae, M. O.; Helas, G.; Thielmann, A.; Gimmler, M.; Mohler, O. M. et al.; Linke, C.; Schurath, U.: Measurement of wavelength-resolved light absorption by aerosols utilizing a UV-VIS extinction cell. Aerosol Science and Technology 39 (3), pp. 249 - 260 (2005)

Ludwig, J.; Marufu, L. T.; Huber, B.; Andreae, M. O.; Helas, G.: Domestic combustion of biomass fuels in developing countries: A major source of atmospheric pollutants. Journal of Atmospheric Chemistry 44 (1), pp. 23 - 37 (2003)