Publications of G. Helas

Dusek, U., Frank, G. P., Massling, A., Zeromskiene, K., Iinuma, Y., Schmid, O., Helas, G., Hennig, T., Wiedensohler, A. and 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), 9519–9532 [online] Available from: http://hdl.handle.net/11858/00-001M-0000-0014-7FE9-F, 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., 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. and Andreae, M. O.: Rainforest Aerosols as Biogenic Nuclei of Clouds and Precipitation in the Amazon, Science, 329(5998), 1513–1516 [online] Available from: http://hdl.handle.net/11858/00-001M-0000-0014-808A-D, 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. and 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, doi:10.1029/2009JD013188, 2010.

Chou, C., Formenti, P., Maille, M., Ausset, P., Helas, G., Harrison, M. and 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), doi:10.1029/2008JD009897, 2008.

Worringen, A., Ebert, M., Trautmann, T., Weinbruch, S. and 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), 3835–3845 [online] Available from: http://hdl.handle.net/11858/00-001M-0000-0014-84BB-5, 2008.

Helas, G. and Andreae, M. O.: Surface features on Sahara soil dust particles made visible by atomic force microscope (AFM) phase images, Atmospheric Measurement Techniques, 1(1), 1–8 [online] Available from: http://hdl.handle.net/11858/00-001M-0000-0014-85BF-6, 2008.

Hungershoefer, K., Zeromskiene, K., Iinuma, Y., Helas, G., Trentmann, J., Trautmann, T., Parmar, R. S., Wiedensohler, A., Andreae, M. O. and 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, 3427–3429 [online] Available from: http://hdl.handle.net/11858/00-001M-0000-0014-853B-C, 2008.

Parmar, R. S., Welling, M., Andreae, M. O. and Helas, G.: Water vapor release from biomass combustion, Atmospheric Chemistry and Physics, 8(20), 6147–6153 [online] Available from: http://hdl.handle.net/11858/00-001M-0000-0014-85B7-5, 2008.

Winkler, H., Formenti, P., Esterhuyse, D. J., Swap, R. J., Helas, G., Annegarn, H. J. and Andreae, M. O.: Evidence for large-scale transport of biomass burning aerosols from sunphotometry at a remote South African site, Atmospheric Environment, 42, 5569–5578 [online] Available from: http://hdl.handle.net/11858/00-001M-0000-0014-8545-5, 2008.

Gwaze, P., Annegarn, H. J., Huth, J. and Helas, G.: Comparison of particle sizes determined with impactor, AFM and SEM, Atmospheric Research, 86(2), 93–104 [online] Available from: http://hdl.handle.net/11858/00-001M-0000-0014-8679-9, 2007.

Iinuma, Y., Brüggemann, E., Gnauk, T., Müller, K., Andreae, M. O., Helas, G., Parmar, R. and 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), doi:10.1029/2006JD007120, 2007.

Gwaze, P., Helas, G., Annegarn, H. J., Huth, J. and 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), 35–43 [online] Available from: http://hdl.handle.net/11858/00-001M-0000-0014-8769-5, 2007.

Schneider, J., Weimer, S., Drewnick, F., Borrmann, S., Helas, G., Gwaze, P., Schmid, O., Andreae, M. O. and Kirchner, U.: Mass spectrometric analysis and aerodynamic properties of various types of combustion-related aerosol particles, International Journal of Mass Spectrometry, 258(1-3), 37–49 [online] Available from: http://hdl.handle.net/11858/00-001M-0000-0014-885A-0, 2006.

Elias, T., Silva, A. M., Belo, N., Pereira, S., Formenti, P., Helas, G. and Wagner, F.: Aerosol extinction in a remote continental region of the Iberian Peninsula during summer, Journal of Geophysical Research-Atmospheres, 111(D14), doi:10.1029/2005JD006610, 2006.

Gwaze, P., Schmid, O., Annegarn, H. J., Andreae, M. O., Huth, J. and Helas, G.: Comparison of three methods of fractal analysis applied to soot aggregates from wood combustion, Journal of Aerosol Science, 37(7), 820–838 [online] Available from: http://hdl.handle.net/11858/00-001M-0000-0014-8904-8, 2006.

Chand, D., Schmid, O., Gwaze, P., Parmar, R. S., Helas, G., Zeromskiene, K., Wiedensohler, A., Massling, A. and 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), doi:10.1029/2005GL022678, 2005.

Dusek, U., Frank, G. P., Helas, G., Iinuma, Y., Zeromskiene, K., Gwaze, P., Hennig, T., Massling, A., Schmid, O., Herrmann, H., Wiedensohler, A. and Andreae, M. O.: "Missing" cloud condensation nuclei in peat smoke, Geophysical Research Letters, 32(11), doi:10.1029/2005GL022473, 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., Slanina, J. and 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), doi:10.1029/2004JD005478, 2005.

Schnaiter, M., Schmid, O., Petzold, A., Fritzsche, L., Klein, K. F., Andreae, M. O., Helas, G., Thielmann, A., Gimmler, M., Mohler, O. M., Linke, C. and Schurath, U.: Measurement of wavelength-resolved light absorption by aerosols utilizing a UV-VIS extinction cell, Aerosol Science and Technology, 39(3), 249–260 [online] Available from: http://hdl.handle.net/11858/00-001M-0000-0014-8B2E-5, 2005.

Ludwig, J., Marufu, L. T., Huber, B., Andreae, M. O. and Helas, G.: Domestic combustion of biomass fuels in developing countries: A major source of atmospheric pollutants, Journal of Atmospheric Chemistry, 44(1), 23–37 [online] Available from: http://hdl.handle.net/11858/00-001M-0000-0014-8F4A-7, 2003.