Publications of G. Helas

Ebert, M.; Weinbruch, S.; Rausch, A.; Gorzawski, G.; Hoffmann, P.; Wex, H.; Helas, G.: Complex refractive index of aerosols during LACE 98 as derived from the analysis of individual particles. Journal of Geophysical Research 107 (D21), 8121 (2002)

Formenti, P.; Winkler, H.; Fourie, P.; Piketh, S.; Makgopa, B.; Helas, G.; Andreae, M. O.: Aerosol optical depth over a remote semi-arid region of South Africa from spectral measurements of the daytime solar extinction and the nighttime stellar extinction. Atmospheric Research 62 (1-2), pp. 11 - 32 (2002)

Ebert, M.; Weinbruch, S.; Rausch, A.; Gorzawski, G.; Wex, H.; Hoffmann, P.; Helas, G.: The complex refractive index of aerosols during LACE 98 as derived from the analysis of indivi-dual particles. Journal of Aerosol Science 32, pp. (Suppl), 683 - 684 (2001)

Gatebe, C. K.; Tyson, D.; Annegarn, H. J.; Helas, G.; Kinyua, A. M.; Piketh, S. J.: Characterization and transport of aerosols over equatorial eastern Africa. Global Biogeochemical Cycles 15, pp. 633 - 672 (2001)

Kituyi, E.; Marufu, L.; Huber, B.; Wandiga, S. O.; Jumba, I. O.; Andreae, M. O.; Helas, G.: Biofuel consumption rates and patterns in Kenya. Biomass and Bioenergy 20, pp. 83 - 99 (2001)

Kituyi, E.; Marufu, L.; Wandiga, S. O.; Jumba, I. O.; Andreae, M. O.; Helas, G.: Biofuel availability and domestic use patterns in Kenya. Biomass and Bioenergy 20, pp. 71 - 82 (2001)

Kituyi, E.; Marufu, L.; Wandiga, S. O.; Jumba, I. O.; Andreae, M. O.; Helas, G.: Carbon monoxide and nitric oxide from biofuel fires in Kenya. Energy Conversion and Management 42, pp. 1517 - 1542 (2001)

Lange, L.; Hoor, P.; Helas, G.; Fischer, H.; Brunner, D.; Scheeren, B.; Williams, J.; Wong, S.; Wohlfrom, K.-H.; Arnold, F. et al.; Ström, J.; Krejci, R.; Lelieveld, J.; Andreae, M. O.: Detection of lightning-produced NO in the midlatitude upper troposphere during STREAM 1998. Journal of Geophysical Research 106 (D21), pp. 27,777 - 27,786 (2001)

Rausch, A.; Trautmann, T.; Weinbruch, S.; Helas, G.: Calculation of scattering and absorption of light by irregular shaped and mixed particles. Journal of Aerosol Science 32, pp. (Suppl), 419 - 420 (2001)

Kirkman, G. A.; Piketh, S. J.; Andreae, M. O.; Annegarn, H. J.; Helas, G.: Distribution of aerosols, ozone and carbon monoxide over southern Africa. South African Journal of Science 96, pp. 423 - 432 (2000)

Marufu, L.; Dentener, F.; Lelieveld, J.; Andreae, M. O.; Helas, G.: Photochemistry of the African troposphere: The influence of biomass burning emissions. Journal of Geophysical Research 105, pp. 14,513 - 14,530 (2000)

Fischer, H.; Brunner, D.; Harris, G. W.; Helas, G.; Hoor, P.; Lange, L.; Lelieveld, J.; Schiller, C. L.; Siegmund, P.; Williams, J. et al.; Wong, S.: Trace gas distribution in the tropopause region: First results from the STREAM-98 summer campaign in Timmins, Canada. Geophysical Research Abstracts 1 (1999)

Gatebe, C. K.; Tyson, P. D.; Annegarn, H.; Piketh, S.; Helas, G.: A seasonal air transport climatology for Kenya. Journal of Geophysical Research 104, pp. 14237 - 14244 (1999)

Gorzawski, G.; Rausch, A.; Ebert, M.; Weinbruch, S.; Hoffmann, P.; Helas, G.: Elemental and phase composition of aerosols sampled during LACE 98. Journal of Aerosol Science 30S, pp. 517 - 518 (1999)

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

Marufu, L.; Ludwig, J.; Andreae, M. O.; Lelieveld, J.; Helas, G.: Spatial and temporal variation in biofuel consumption rates and patterns in Zimbabwe: Implications for atmospheric trace gas emission. Biomass and Bioenergy 16, pp. 311 - 332 (1999)

Rausch, A.; Ebert, M.; Gorzawski, G.; Weinbruch, S.; Hoffmann, P.; Helas, G.: High-resolution scanning electron microscopy of individual aerosol particles obtained during LACE 98. Journal of Aerosol Science 30S, pp. 515 - 516 (1999)

Wentzel, M.; Annegarn, H. J.; Helas, G.; Weinbruch, S.; Balogh, A. G.; Sithole, J. S.: Giant dendritic carbonaceous particles in Soweto aerosols. South African Journal of Science 95, pp. 141 - 145 (1999)

Kituyi, E.; Wandiga, S. O.; Andreae, M. O.; Helas, G.: Biomass burning in Africa: role in atmospheric change and opportunities for emission mitigation. In: Climate Change and Africa, pp. 79 - 89 (Ed. Low, P. S.). Cambridge University Press, New York (2005)