Ändra sökning
Avgränsa sökresultatet
1 - 2 av 2
RefereraExporteraLänk till träfflistan
Permanent länk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Träffar per sida
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sortering
  • Standard (Relevans)
  • Författare A-Ö
  • Författare Ö-A
  • Titel A-Ö
  • Titel Ö-A
  • Publikationstyp A-Ö
  • Publikationstyp Ö-A
  • Äldst först
  • Nyast först
  • Skapad (Äldst först)
  • Skapad (Nyast först)
  • Senast uppdaterad (Äldst först)
  • Senast uppdaterad (Nyast först)
  • Disputationsdatum (tidigaste först)
  • Disputationsdatum (senaste först)
  • Standard (Relevans)
  • Författare A-Ö
  • Författare Ö-A
  • Titel A-Ö
  • Titel Ö-A
  • Publikationstyp A-Ö
  • Publikationstyp Ö-A
  • Äldst först
  • Nyast först
  • Skapad (Äldst först)
  • Skapad (Nyast först)
  • Senast uppdaterad (Äldst först)
  • Senast uppdaterad (Nyast först)
  • Disputationsdatum (tidigaste först)
  • Disputationsdatum (senaste först)
Markera
Maxantalet träffar du kan exportera från sökgränssnittet är 250. Vid större uttag använd dig av utsökningar.
  • 1. Lehtipalo, Katrianne
    et al.
    Yan, Chao
    Dada, Lubna
    Bianchi, Federico
    Xiao, Mao
    Wagner, Robert
    Stolzenburg, Dominik
    Ahonen, Lauri R.
    Amorim, Antonio
    Baccarini, Andrea
    Bauer, Paulus S.
    Baumgartner, Bernhard
    Bergen, Anton
    Bernhammer, Anne-Kathrin
    Breitenlechner, Martin
    Brilke, Sophia
    Buchholz, Angela
    Mazon, Stephany Buenrostro
    Chen, Dexian
    Chen, Xuemeng
    Dias, Antonio
    Dommen, Josef
    Draper, Danielle C.
    Duplissy, Jonathan
    Ehn, Mikael
    Finkenzeller, Henning
    Fischer, Lukas
    Frege, Carla
    Fuchs, Claudia
    Garmash, Olga
    Gordon, Hamish
    Hakala, Jani
    He, Xucheng
    Heikkinen, Liine
    Heinritzi, Martin
    Helm, Johanna C.
    Hofbauer, Victoria
    Hoyle, Christopher R.
    Jokinen, Tuija
    Kangasluoma, Juha
    Kerminen, Veli-Matti
    Kim, Changhyuk
    Kirkby, Jasper
    Kontkanen, Jenni
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för miljövetenskap och analytisk kemi. University of Helsinki, Finland.
    Kuerten, Andreas
    Lawler, Michael J.
    Mai, Huajun
    Mathot, Serge
    Mauldin, Roy L.
    Molteni, Ugo
    Nichman, Leonid
    Nie, Wei
    Nieminen, Tuomo
    Ojdanic, Andrea
    Onnela, Antti
    Passananti, Monica
    Petaja, Tuukka
    Piel, Felix
    Pospisilova, Veronika
    Quelever, Lauriane L. J.
    Rissanen, Matti P.
    Rose, Clemence
    Sarnela, Nina
    Schallhart, Simon
    Schuchmann, Simone
    Sengupta, Kamalika
    Simon, Mario
    Sipila, Mikko
    Tauber, Christian
    Tome, Antonio
    Trostl, Jasmin
    Vaisanen, Olli
    Vogel, Alexander L.
    Volkamer, Rainer
    Wagner, Andrea C.
    Wang, Mingyi
    Weitz, Lena
    Wimmer, Daniela
    Ye, Penglin
    Ylisirnio, Arttu
    Zha, Qiaozhi
    Carslaw, Kenneth S.
    Curtius, Joachim
    Donahue, Neil M.
    Flagan, Richard C.
    Hansel, Armin
    Riipinen, Ilona
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för miljövetenskap och analytisk kemi. Tampere University of Technology, Finland.
    Virtanen, Annele
    Winkler, Paul M.
    Baltensperger, Urs
    Kulmala, Markku
    Worsnop, Douglas R.
    Multicomponent new particle formation from sulfuric acid, ammonia, and biogenic vapors2018Ingår i: Science Advances, E-ISSN 2375-2548, Vol. 4, nr 12, artikel-id eaau5363Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A major fraction of atmospheric aerosol particles, which affect both air quality and climate, form from gaseous precursors in the atmosphere. Highly oxygenated organic molecules (HOMs), formed by oxidation of biogenic volatile organic compounds, are known to participate in particle formation and growth. However, it is not well understood how they interact with atmospheric pollutants, such as nitrogen oxides (NOx) and sulfur oxides (SOx) from fossil fuel combustion, as well as ammonia (NH3) from livestock and fertilizers. Here, we show how NOx suppresses particle formation, while HOMs, sulfuric acid, and NH3 have a synergistic enhancing effect on particle formation. We postulate a novel mechanism, involving HOMs, sulfuric acid, and ammonia, which is able to closely reproduce observations of particle formation and growth in daytime boreal forest and similar environments. The findings elucidate the complex interactions between biogenic and anthropogenic vapors in the atmospheric aerosol system.

  • 2. Wimmer, Daniela
    et al.
    Mazon, Stephany Buenrostro
    Manninen, Hanna Elina
    Kangasluoma, Juha
    Franchin, Alessandro
    Nieminen, Tuomo
    Backman, John
    Wang, Jian
    Kuang, Chongai
    Krejci, Radovan
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för miljövetenskap och analytisk kemi.
    Brito, Joel
    Morais, Fernando Goncalves
    Martin, Scot Turnbull
    Artaxo, Paulo
    Kulmala, Markku
    Kerminen, Veli-Matti
    Petäjä, Tuukka
    Ground-based observation of clusters and nucleation-mode particles in the Amazon2018Ingår i: Atmospheric Chemistry And Physics, ISSN 1680-7316, E-ISSN 1680-7324, Vol. 18, nr 17, s. 13245-13264Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We investigated atmospheric new particle formation (NPF) in the Amazon rainforest using direct measurement methods. To our knowledge this is the first direct observation of NPF events in the Amazon region. However, previous observations elsewhere in Brazil showed the occurrence of nucleation-mode particles. Our measurements covered two field sites and both the wet and dry season. We measured the variability of air ion concentrations (0.8-12 nm) with an ion spectrometer between September 2011 and January 2014 at a rainforest site (T0t). Between February and October 2014, the same measurements were performed at a grassland pasture site (T3) as part of the GoAmazon 2014/5 experiment, with two intensive operating periods (IOP1 and IOP2 during the wet and the dry season, respectively). The GoAmazon 2014/5 experiment was designed to study the influence of anthropogenic emissions on the changing climate in the Amazon region. The experiment included basic aerosol and trace gas measurements at the ground, remote sensing instrumentation, and two aircraft-based measurements. The results presented in this work are from measurements performed at ground level at both sites. The site inside the rainforest (T0t) is located 60 km NNW of Manaus and influenced by pollution about once per week. The pasture (T3) site is located 70 km downwind from Manaus and influenced by the Manaus pollution plume typically once per day or every second day, especially in the afternoon. No NPF events were observed inside the rainforest (site T0t) at ground level during the measurement period. However, rain-induced ion and particle bursts (hereafter, rain events) occurred frequently (643 of 1031 days) at both sites during the wet and dry season, being most frequent during the wet season. During the rain events, the ion concentrations in three size ranges (0.8-2, 2-4, and 4-12 nm) increased up to about 10(4)-10(5) cm(-3). This effect was most pronounced in the intermediate and large size ranges, for which the background ion concentrations were about 10-15 cm(-3) compared with 700 cm(-3) for the cluster ion background. We observed eight NPF events at the pasture site during the wet season. We calculated the growth rates and formation rates of neutral particles and ions for the size ranges 2-3 and 3-7 nm using the ion spectrometer data. The observed median growth rates were 0.8 and 1.6 nm h(-1) for 2-3 nm sized ions and particles, respectively, with larger growth rates (13.3 and 7.9 nm h(-1)) in the 3-7 nm size range. The measured nucleation rates were of the order of 0.2 cm(-3) s(-1) for particles and 4-9 x 10(-3) cm(-3) s(-1) for ions. There was no clear difference in the sulfuric acid concentrations between the NPF event days and nonevent days (similar to 9 x 10(5) cm(-3)). The two major differences between the NPF days and nonevent days were a factor of 1.8 lower condensation sink on NPF event days (1.8 x 10(-3) s(-1)) compared to nonevents (3.2 x 10(-3) s(-1)) and different air mass origins. To our knowledge, this is the first time that results from ground-based sub-3 nm aerosol particle measurements have been obtained from the Amazon rainforest.

1 - 2 av 2
RefereraExporteraLänk till träfflistan
Permanent länk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf