Zobrazeno 1 - 10
of 377
pro vyhledávání: '"Hanna, Vehkamäki"'
Autor:
Jakub Kubečka, Vitus Besel, Ivo Neefjes, Yosef Knattrup, Theo Kurtén, Hanna Vehkamäki, Jonas Elm
Publikováno v:
ACS Omega, Vol 8, Iss 47, Pp 45115-45128 (2023)
Externí odkaz:
https://doaj.org/article/09cb56b1f9d84e269b72244d67185a3c
Publikováno v:
Scientific Data, Vol 10, Iss 1, Pp 1-11 (2023)
Abstract Low-volatile organic compounds (LVOCs) drive key atmospheric processes, such as new particle formation (NPF) and growth. Machine learning tools can accelerate studies of these phenomena, but extensive and versatile LVOC datasets relevant for
Externí odkaz:
https://doaj.org/article/d6ef769c765b4c4896d80d09fca99824
Publikováno v:
Frontiers in Plant Science, Vol 12 (2021)
Air seeded nanobubbles have recently been observed within tree sap under negative pressure. They are stabilized by an as yet unidentified process, although some embolize their vessels in extreme circumstances. Current literature suggests that a varyi
Externí odkaz:
https://doaj.org/article/086d076e900040cea848368f072dce71
Autor:
Pontus Roldin, Mikael Ehn, Theo Kurtén, Tinja Olenius, Matti P. Rissanen, Nina Sarnela, Jonas Elm, Pekka Rantala, Liqing Hao, Noora Hyttinen, Liine Heikkinen, Douglas R. Worsnop, Lukas Pichelstorfer, Carlton Xavier, Petri Clusius, Emilie Öström, Tuukka Petäjä, Markku Kulmala, Hanna Vehkamäki, Annele Virtanen, Ilona Riipinen, Michael Boy
Publikováno v:
Nature Communications, Vol 10, Iss 1, Pp 1-15 (2019)
Forests emit compounds into the atmosphere that are oxidized into highly oxygenated molecules that serve as precursors for cloud condensation nuclei–a process that impacts the climate, but is poorly represented in models. Here the authors create a
Externí odkaz:
https://doaj.org/article/44d7925ecfeb40f08bf4925e80ac9daf
Publikováno v:
Atmospheric Chemistry and Physics. 22:10099-10114
Ice clouds can form at low and moderate supercooling through heterogeneous ice nucleation on atmospheric particles. Typically, the nucleation requires active sites with special chemical and physical properties, including surface topology and roughnes
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::079c53336be8ba31f4ad6b30dbd63491
https://doi.org/10.5194/acp-22-10099-2022
https://doi.org/10.5194/acp-22-10099-2022
As cloud and aerosol interactions remain large uncertainties in current climate models (IPCC) they are of special interest for atmospheric science. It is estimated that more than 70% of all cloud condensation nuclei origin from so-called New Particle
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1360cc631b23f608356c5fccc79ca7db
https://doi.org/10.5194/egusphere-egu23-1135
https://doi.org/10.5194/egusphere-egu23-1135
Autor:
Huan Yang, Ivo Neefjes, Valtteri Tikkanen, Jakub Kubečka, Theo Kurtén, Hanna Vehkamäki, Bernhard Reischl
Publikováno v:
eISSN
Kinetics of collision-sticking processes between vapor molecules and clusters of low-volatility compounds govern the initial steps of atmospheric new particle formation. Conventional non-interacting hard-sphere models underestimate the collision rate
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f19cbac22fa466ae5bcc2c2946707864
https://doi.org/10.5194/egusphere-egu23-6193
https://doi.org/10.5194/egusphere-egu23-6193
Nucleation of clusters from the gas phase is a widely encountered phenomenon, e.g. regional air quality and global climate are both directly impacted by particle formation from atmospheric trace gases [1]. Still, the underlying out-of-equilibrium dyn
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::82cf2692e18fe92831c3faa752cf336a
https://doi.org/10.5194/egusphere-egu23-12521
https://doi.org/10.5194/egusphere-egu23-12521
Publikováno v:
eISSN
Collisions between ions and dipolar molecules can facilitate the formation of atmospheric aerosol particles and play an important role in their detection in chemical ionization mass spectrometers. Conventionally, analytical models or simple parametri
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::402315e2abeceea64e3c6c55ca8c999a
https://doi.org/10.5194/egusphere-egu23-14945
https://doi.org/10.5194/egusphere-egu23-14945
Publikováno v:
Toropainen, A, Kangasluoma, J, Vehkamäki, H & Kubečka, J 2023, ' Heterogeneous Ion-Induced Nucleation of Water and Butanol Vapors Studied via Computational Quantum Chemistry beyond Prenucleation and Critical Cluster Sizes ', Journal of Physical Chemistry A, vol. 127, no. 18, pp. 3976–3990 . https://doi.org/10.1021/acs.jpca.3c00066
Water and butanol are used as working fluids in condensation particle counters, and condensation of a single vapor onto an ion can be used as a simple model system for the study of ion-induced nucleation in the atmosphere. Motivated by this, we exami
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::67cd558f8b56ea0dc2900c53085f9cff
http://hdl.handle.net/10138/359568
http://hdl.handle.net/10138/359568