Publications

Vulkansk aske - den norske modellen.

Tørseth, K.

Vortex-averaged Arctic ozone depletion in the winter 2002/2003.

Christensen, T.; Knudsen, B.M.; Streibel, M.; Andersen, S.B.; Benesova, A.; Braathen, G.; Claude, H.; Davies, J.; De Backer, H.; Dier, H.; Dorokhov, V.; Gerding, M.; Gil, M.; Henchoz, B.; Kelder, H.; Kivi, R.; Kyrö, E.; Litynska, Z.; Moore, D.; Peters, G.; Skrivankova, P.; Stübi, R.; Turunen, T.; Vaughan, G.; Viatte, P.; Vik, A.F.; von der Gathen, P.; Zaitcev, I.

Volcanoes and aviation.

Zehner, C.; Theys, N.; Prata, F.; Davies, I.

Volcanic dust characterization by EARLINET during Etna's eruptions in 2001-2002.

Wang, X.; Boselli, A.; D'Avino, L.; Pisani, G.; Spinelli, N.; Amodeo, A.; Chaikovsky, A.; Wiegner, M.; Nickovic, S.; Papayannis, A.; Perrone, M.R.; Rizi, V.; Sauvage, L.; Stohl, A.

Volcanic ash infrared signature: porous non-spherical ash particle shapes compared to homogeneous spherical ash particles.

Kylling, A.; Kahnert, M.; Lindqvist, H.; Nousiainen, T.

Volcanic ash and SO2 in the 2008 Kasatochi eruption: Retrievals comparison from different IR satellite sensors.

Corradini, S.; Merucci, L.; Prata, F.; Piscini, A.

Volatile siloxanes in the European Arctic: assessment of sources and spatial distribution.

Warner, N.; Evenset, A.; Christensen, G.; Gabrielsen, G.W.; Borgå, K.; Leknes, H.

Volatile Organic Compounds of Diverse Origins and Their Changes Associated With Cultivar Decay in a Fungus-Farming Termite

Vidkjær, Nanna Hjort; Schmidt, Suzanne; Davie-Martin, Cleo Lisa; Silué, Kolotchèlèma Simon; Koné, N'golo Abdoulaye; Rinnan, Riikka; Poulsen, Michael

Fungus-farming termites cultivate a Termitomyces fungus monoculture in enclosed gardens (combs) free of other fungi, except during colony declines, where Pseudoxylaria spp. stowaway fungi appear and take over combs. Here, we determined Volatile Organic Compounds (VOCs) of healthy Macrotermes bellicosus nests in nature and VOC changes associated with comb decay during Pseudoxylaria takeover. We identified 443 VOCs and unique volatilomes across samples and nest volatilomes that were mainly composed of fungus comb VOCs with termite contributions. Few comb VOCs were linked to chemical changes during decay, but longipinocarvone and longiverbenone were only emitted during comb decay. These terpenes may be involved in Termitomyces defence against antagonistic fungi or in fungus-termite signalling of comb state. Both comb and Pseudoxylaria biomass volatilomes contained many VOCs with antimicrobial activity that may serve in maintaining healthy Termitomyces monocultures or aid in the antagonistic takeover by Pseudoxylaria during colony decline. We further observed a series of oxylipins with known functions in the regulation of fungus germination, growth, and secondary metabolite production. Our volatilome map of the fungus-farming termite symbiosis provides new insights into the chemistry regulating complex interactions and serves as a valuable guide for future work on the roles of VOCs in symbioses.

Volatile organic compounds in the museum environment - a PTR-TOF pilot study on canvas samples. NILU F

Mikoviny, T.; Eichler, P.; Müller, M.; Grøntoft, T.; Wisthaler, A.

Volatile Organic Compounds (VOCs) in the tropics (Réunion Island, Indian Ocean)

Magand, Olivier; Boulanger, Patricia; Staménoff, Pierre; David, Magali; Hernandez, Patrick; Golubic, Eric; Hello, Yann; Ah-Peng, Claudine; Duflot, Valentin; Ktata, Olivier; Rocco, Manon

Volatile and persistent emissions from traffic and power production on Svalbard. VETAPOS. NILU OR

Kallenborn, R.; Schmidbauer, N.; Reimann, S.

Volatile organic compounds (VOC) including Benzene-Toluene-Xylene (BTX) related compounds were monitored in ambient air samples during Spring (April-Mai) and Autumn (October) 2010 as a follow-up of an earlier BTX ambient air monitoring program in 2007 (Reimann et al 2007) at the Research park in Longyearbyen (Forskningsparken). In addition, BTX related compounds were measured in 18 ¿headspace¿ samples above collected surface soil along snowmobile tracks in Longyeardalen, Adventdalen, Todalen as well as Sassendalen (Fredheim). In addition, during the 2010 VETAPOS in a parallel surface soil sampling campaign 18 samples were analysed for 15 priority PAH compounds.

VOC measurements by PTR-ToF-MS at the Birkenes Observatory. A summary report. NILU OR

Langebner, S.; Mikoviny, T.; Müller, M.; Wisthaler, A.

A high resolution proton-transfer-reaction time-of-flight mass spectrometer (PTR-ToF- MS) was used for on-line and real-time measurements of volatile organic compounds (VOCs) at the Birkenes Observatory in Southern Norway. Measurements were carried out during late spring and summer 2012 and in January and early February 2013. Here we present the obtained PTR-MS standard data product which includes volume mixing ratios of methanol, acetonitrile, acetaldehyde, acetone, dimethyl sulphide, isoprene, methacrolein plus methylvinylketone, methylethylketone, benzene, toluene, C8-alkylbenzenes, C9-alkylbenzenes and the sum of the monoterpene isomers. Exploratory data of formic acid, acetic acid, pinonaldehyde and three unidentified signals (m/z 87.080, m/z 89.060 and m/z 101.098) are also shown. PTR-ToF-MS mass spectra were dominated by oxygenated VOCs both in summer and in winter. Pure hydrocarbons were mostly aromatic hydrocarbons (benzene, toluene, C8-alkylbenzenes) in winter and biogenic hydrocarbons (monoterpenes and isoprene) in summer. The summertime data confirm that the Birkenes Observatory is an interesting site in the boreo-nemoral vegetation zone where it is possible to observe both monoterpene and isoprene emissions and their photochemical processing in the atmosphere.