Zobrazeno 1 - 10
of 246
pro vyhledávání: '"H. Keskinen"'
Autor:
L. Heikkinen, M. Äijälä, M. Riva, K. Luoma, K. Dällenbach, J. Aalto, P. Aalto, D. Aliaga, M. Aurela, H. Keskinen, U. Makkonen, P. Rantala, M. Kulmala, T. Petäjä, D. Worsnop, M. Ehn
Publikováno v:
Atmospheric Chemistry and Physics, Vol 20, Pp 3151-3180 (2020)
The Station for Measuring Ecosystem–Atmosphere Relations (SMEAR) II is well known among atmospheric scientists due to the immense amount of observational data it provides of the Earth–atmosphere interface. Moreover, SMEAR II plays an important ro
Externí odkaz:
https://doaj.org/article/cdcc070c7aa743f583d2c6022e03c35d
Autor:
Y. Shen, A. Virkkula, A. Ding, K. Luoma, H. Keskinen, P. P. Aalto, X. Chi, X. Qi, W. Nie, X. Huang, T. Petäjä, M. Kulmala, V.-M. Kerminen
Publikováno v:
Atmospheric Chemistry and Physics, Vol 19, Pp 15483-15502 (2019)
The concentration of cloud condensation nuclei (CCN) is an essential parameter affecting aerosol–cloud interactions within warm clouds. Long-term CCN number concentration (NCCN) data are scarce; there are a lot more data on aerosol optical properti
Externí odkaz:
https://doaj.org/article/5f3b1713ffee4d5e899243fd5582a811
Autor:
W. Sun, L. M. J. Kooijmans, K. Maseyk, H. Chen, I. Mammarella, T. Vesala, J. Levula, H. Keskinen, U. Seibt
Publikováno v:
Atmospheric Chemistry and Physics, Vol 18, Pp 1363-1378 (2018)
Soil is a major contributor to the biosphere–atmosphere exchange of carbonyl sulfide (COS) and carbon monoxide (CO). COS is a tracer with which to quantify terrestrial photosynthesis based on the coupled leaf uptake of COS and CO2, but such use
Externí odkaz:
https://doaj.org/article/d97cdb58845b4e1d804884f4bef74019
Autor:
J. Schmale, S. Henning, S. Decesari, B. Henzing, H. Keskinen, K. Sellegri, J. Ovadnevaite, M. L. Pöhlker, J. Brito, A. Bougiatioti, A. Kristensson, N. Kalivitis, I. Stavroulas, S. Carbone, A. Jefferson, M. Park, P. Schlag, Y. Iwamoto, P. Aalto, M. Äijälä, N. Bukowiecki, M. Ehn, G. Frank, R. Fröhlich, A. Frumau, E. Herrmann, H. Herrmann, R. Holzinger, G. Kos, M. Kulmala, N. Mihalopoulos, A. Nenes, C. O'Dowd, T. Petäjä, D. Picard, C. Pöhlker, U. Pöschl, L. Poulain, A. S. H. Prévôt, E. Swietlicki, M. O. Andreae, P. Artaxo, A. Wiedensohler, J. Ogren, A. Matsuki, S. S. Yum, F. Stratmann, U. Baltensperger, M. Gysel
Publikováno v:
Atmospheric Chemistry and Physics, Vol 18, Pp 2853-2881 (2018)
Aerosol–cloud interactions (ACI) constitute the single largest uncertainty in anthropogenic radiative forcing. To reduce the uncertainties and gain more confidence in the simulation of ACI, models need to be evaluated against observations, in pa
Externí odkaz:
https://doaj.org/article/1251501776c44c42938719f834cfebdc
Autor:
M. J. Lawler, P. M. Winkler, J. Kim, L. Ahlm, J. Tröstl, A. P. Praplan, S. Schobesberger, A. Kürten, J. Kirkby, F. Bianchi, J. Duplissy, A. Hansel, T. Jokinen, H. Keskinen, K. Lehtipalo, M. Leiminger, T. Petäjä, M. Rissanen, L. Rondo, M. Simon, M. Sipilä, C. Williamson, D. Wimmer, I. Riipinen, A. Virtanen, J. N. Smith
Publikováno v:
Atmospheric Chemistry and Physics, Vol 16, Pp 13601-13618 (2016)
New particle formation driven by acid–base chemistry was initiated in the CLOUD chamber at CERN by introducing atmospherically relevant levels of gas-phase sulfuric acid and dimethylamine (DMA). Ammonia was also present in the chamber as a gas-ph
Externí odkaz:
https://doaj.org/article/951f02476bb441de8f74f1cccbbd4f46
Autor:
J. Kim, L. Ahlm, T. Yli-Juuti, M. Lawler, H. Keskinen, J. Tröstl, S. Schobesberger, J. Duplissy, A. Amorim, F. Bianchi, N. M. Donahue, R. C. Flagan, J. Hakala, M. Heinritzi, T. Jokinen, A. Kürten, A. Laaksonen, K. Lehtipalo, P. Miettinen, T. Petäjä, M. P. Rissanen, L. Rondo, K. Sengupta, M. Simon, A. Tomé, C. Williamson, D. Wimmer, P. M. Winkler, S. Ehrhart, P. Ye, J. Kirkby, J. Curtius, U. Baltensperger, M. Kulmala, K. E. J. Lehtinen, J. N. Smith, I. Riipinen, A. Virtanen
Publikováno v:
Atmospheric Chemistry and Physics, Vol 16, Pp 293-304 (2016)
Sulfuric acid, amines and oxidized organics have been found to be important compounds in the nucleation and initial growth of atmospheric particles. Because of the challenges involved in determining the chemical composition of objects with very small
Externí odkaz:
https://doaj.org/article/28171d5f1fac4f338639df9f83d730e2
Autor:
M. Dalirian, H. Keskinen, L. Ahlm, A. Ylisirniö, S. Romakkaniemi, A. Laaksonen, A. Virtanen, I. Riipinen
Publikováno v:
Atmospheric Chemistry and Physics, Vol 15, Iss 7, Pp 3815-3829 (2015)
Particle–water interactions of completely soluble or insoluble particles are fairly well understood but less is known of aerosols consisting of mixtures of soluble and insoluble components. In this study, laboratory measurements were performed to i
Externí odkaz:
https://doaj.org/article/ff1fc91db80b4680bec838b201a3d09d
Autor:
H. Kokkola, P. Yli-Pirilä, M. Vesterinen, H. Korhonen, H. Keskinen, S. Romakkaniemi, L. Hao, A. Kortelainen, J. Joutsensaari, D. R. Worsnop, A. Virtanen, K. E. J. Lehtinen
Publikováno v:
Atmospheric Chemistry and Physics, Vol 14, Iss 3, Pp 1689-1700 (2014)
Large-scale atmospheric models, which typically describe secondary organic aerosol (SOA) formation based on chamber experiments, tend to systematically underestimate observed organic aerosol burdens. Since SOA constitutes a significant fraction of at
Externí odkaz:
https://doaj.org/article/737dd796249c49c19f8cf3671f8a0cf9
Autor:
H. Keskinen, A. Virtanen, J. Joutsensaari, G. Tsagkogeorgas, J. Duplissy, S. Schobesberger, M. Gysel, F. Riccobono, J. G. Slowik, F. Bianchi, T. Yli-Juuti, K. Lehtipalo, L. Rondo, M. Breitenlechner, A. Kupc, J. Almeida, A. Amorim, E. M. Dunne, A. J. Downard, S. Ehrhart, A. Franchin, M.K. Kajos, J. Kirkby, A. Kürten, T. Nieminen, V. Makhmutov, S. Mathot, P. Miettinen, A. Onnela, T. Petäjä, A. Praplan, F. D. Santos, S. Schallhart, M. Sipilä, Y. Stozhkov, A. Tomé, P. Vaattovaara, D. Wimmer, A. Prevot, J. Dommen, N. M. Donahue, R.C. Flagan, E. Weingartner, Y. Viisanen, I. Riipinen, A. Hansel, J. Curtius, M. Kulmala, D. R. Worsnop, U. Baltensperger, H. Wex, F. Stratmann, A. Laaksonen
Publikováno v:
Atmospheric Chemistry and Physics, Vol 13, Iss 11, Pp 5587-5600 (2013)
Sulphuric acid, ammonia, amines, and oxidised organics play a crucial role in nanoparticle formation in the atmosphere. In this study, we investigate the composition of nucleated nanoparticles formed from these compounds in the CLOUD (Cosmics Leaving
Externí odkaz:
https://doaj.org/article/eb625317b7a345edb6cb019eaa9259c9
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