Zobrazeno 1 - 10
of 134
pro vyhledávání: '"G. Helas"'
Autor:
U. Dusek, G. P. Frank, A. Massling, K. Zeromskiene, Y. Iinuma, O. Schmid, G. Helas, T. Hennig, A. Wiedensohler, M. O. Andreae
Publikováno v:
Atmospheric Chemistry and Physics, Vol 11, Iss 18, Pp 9519-9532 (2011)
We investigate the CCN activity of freshly emitted biomass burning particles and their hygroscopic growth at a relative humidity (RH) of 85%. The particles were produced in the Mainz combustion laboratory by controlled burning of various wood types.
Externí odkaz:
https://doaj.org/article/7a2be064545d4d72b1c5de4b0e285487
Publikováno v:
Atmospheric Chemistry and Physics, Vol 8, Iss 20, Pp 6147-6153 (2008)
We report on the emission of water vapor from biomass combustion. Concurrent measurements of carbon monoxide and carbon dioxide are used to scale the concentrations of water vapor found, and are referenced to carbon in the biomass. The investigated f
Externí odkaz:
https://doaj.org/article/519f924c6ec54f9e82336a91f07c133a
Autor:
M. O. Andreae, G. Helas
Publikováno v:
Atmospheric Measurement Techniques, Vol 1, Iss 1, Pp 1-8 (2008)
We show that atomic force microscopy (AFM) phase images can reveal surface features of soil dust particles, which are not evident using other microscopic methods. The non-contact AFM method is able to resolve topographical structures in the nanometer
Externí odkaz:
https://doaj.org/article/a16d1c378b9043fca05095ae51609c23
Autor:
K. Hungershoefer, K. Zeromskiene, Y. Iinuma, G. Helas, J. Trentmann, T. Trautmann, R. S. Parmar, A. Wiedensohler, M. O. Andreae, O. Schmid
Publikováno v:
Atmospheric Chemistry and Physics, Vol 8, Iss 13, Pp 3427-3439 (2008)
A better characterisation of the optical properties of biomass burning aerosol as a function of the burning conditions is required in order to quantify their effects on climate and atmospheric chemistry. Controlled laboratory combustion experiments w
Externí odkaz:
https://doaj.org/article/1ca165a8ca114747833dc6094f82fdfd
Autor:
Rebecca M. Garland, Stephan Borrmann, Hang Su, G. Helas, Jose L. Jimenez, Sachin S. Gunthe, J. A. Huffman, Anthony J. Prenni, Ulrich Pöschl, Meinrat O. Andreae, Baerbel Sinha, Scot T. Martin, S. R. Zorn, Diana Rose, Qi Chen, Johannes Schneider, Delphine K. Farmer, Stephen M. King, Theotonio Pauliquevis, Markus D. Petters, Antonio O. Manzi, Pontus Roldin, Eugene Mikhailov, Paulo Artaxo
Publikováno v:
Science. 329:1513-1516
Clean or Dirty Aerosols strongly affect atmospheric properties and processes—including visibility, cloud formation, and radiative behavior. Knowing their effects in both clean and polluted air is necessary in order to understand their influence (se
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::432de1cc8d3120dd17202970a0e79a4b
https://doi.org/10.1126/science.1191056
https://doi.org/10.1126/science.1191056
Autor:
G. Helas, M. O. Andreae
Publikováno v:
Atmospheric Measurement Techniques, Vol 1, Iss 1, Pp 1-8 (2008)
We show that atomic force microscopy (AFM) phase images can reveal surface features of soil dust particles, which are not evident using other microscopic methods. The non-contact AFM method is able to resolve topographical structures in the nanometer
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2f01038de41f4fb2353ec4b273487062
http://www.atmos-meas-tech.net/1/1/2008/amt-1-1-2008.pdf
http://www.atmos-meas-tech.net/1/1/2008/amt-1-1-2008.pdf
Autor:
Johannes Schneider, Ulf Kirchner, Frank Drewnick, Stephan Borrmann, S. Weimer, Meinrat O. Andreae, G. Helas, Patience Gwaze, Otmar Schmid
Publikováno v:
International Journal of Mass Spectrometry. 258:37-49
Various types of combustion-related particles in the size range between 100 and 850 nm were analyzed with an aerosol mass spectrometer and a differential mobility analyzer. The measurements were performed with particles originating from biomass burni
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4ecf5c18998c68ec0ec9c4388f09fcad
https://doi.org/10.1016/j.ijms.2006.07.008
https://doi.org/10.1016/j.ijms.2006.07.008
Autor:
Axel Thielmann, Lutz Fritzsche, C. Linke, Ulrich Schurath, Andreas Petzold, Otmar Schmid, G. Helas, Martin Schnaiter, Karl-Friedrich Klein, Melanie Gimmler, Meinrat O. Andreae, Ottmar Möhler
Publikováno v:
ResearcherID
The principle, technical details, and performance of the long path extinction spectrometer (LOPES), a new folded-path extinction cell with a spectral range from the mid-UV (200 nm) to the near infrared (1015 nm), is presented. Using nonabsorbing glas
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8f7a8c810279efae22031146698162a6
https://doi.org/10.1080/027868290925958
https://doi.org/10.1080/027868290925958
Publikováno v:
Journal of Atmospheric Chemistry. 44:23-37
Biomass burning has important impacts on atmospheric chemistry and climate. Fires in tropical forests and savannas release large quantities of trace gases and particulate matter. Com- bustion of biofuels for cooking and heating constitutes a less spe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::27acc2849c682a4a260c0d08c94afd19
https://doi.org/10.1023/a:1022159910667
https://doi.org/10.1023/a:1022159910667
Autor:
Hartmut Winkler, Meinrat O. Andreae, B. Makgopa, Paola Formenti, G. Helas, P. Fourie, Stuart Piketh
Publikováno v:
Atmospheric Research. 62:11-32
Spectral daytime aerosol optical depths have been measured at Sutherland, South Africa (32°22′S, 20°48′E), from January 1998 to November 1999. Sutherland is located in the semi-arid Karoo desert, approximately 400-km northeast from Cape Town. T
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::eaa8d1436de5e17be6a7f61f2fd7b21d
https://doi.org/10.1016/s0169-8095(02)00021-2
https://doi.org/10.1016/s0169-8095(02)00021-2