Results 21 to 30 of about 3,768,335 (339)

Emissions of volatile organic compounds from Norway spruce and potential atmospheric impacts

Frontiers in Forests and Global Change, 2023
Published biogenic volatile organic compound (BVOC) emission rates of Norway spruces vary a lot. In this study we combined published Norway spruce emission rates measured in boreal forests and added our new, unpublished emission data from Southern (SF ...
Hannele Hakola, Ditte Taipale, Ditte Taipale, Arnaud Praplan, Simon Schallhart, Steven Thomas, Toni Tykkä, Aku Helin, Jaana Bäck, Heidi Hellén   +9 more
doaj   +1 more source

OH reactivity from the emissions of different tree species: investigating the missing reactivity in a boreal forest [PDF]

Biogeosciences, 2020
In forested area, a large fraction of total hydroxyl radical (OH) reactivity remains unaccounted for. Very few studies have looked at the variations in total OH reactivity from biogenic emissions.
A. P. Praplan, T. Tykkä, S. Schallhart, V. Tarvainen, J. Bäck, H. Hellén   +5 more
doaj   +1 more source

Applications and limitations of constrained high-resolution peak fitting on low resolving power mass spectra from the ToF-ACSM [PDF]

Atmospheric Measurement Techniques, 2016
The applicability, methods and limitations of constrained peak fitting on mass spectra of low mass resolving power (m∕Δm50 ∼ 500) recorded with a time-of-flight aerosol chemical speciation monitor (ToF-ACSM) are explored. Calibration measurements as well
H. Timonen, M. Cubison, M. Aurela, D. Brus, H. Lihavainen, R. Hillamo, M. Canagaratna, B. Nekat, R. Weller, D. Worsnop, S. Saarikoski   +10 more
doaj   +1 more source

Measuring atmospheric composition change [PDF]

Atmospheric Environment, 2009
Scientific findings from the last decades have clearly highlighted the need for a more comprehensive approach to atmospheric change processes. In fact, observation of atmospheric composition variables has been an important activity of atmospheric research that has developed instrumental tools (advanced analytical techniques) and platforms (instrumented
Laj P, Klausen, J., Bilde, M., Plaß-Duelmer, C., Pappalardo, G., Clerbaux, C., Baltensperger, U., Hjorth, J., Simpson, D., Reimann, S., Coheur, P.-F., Richter, A., De Mazière, M., Rudich, Y., McFiggans, G., Torseth, K., Wiedensohler, A., Morin, S., Schulz, M., Allan, J.D., Attié, J.-L., Barnes, I., Birmili, W., Cammas, J.P., Dommen, J., Dorn, H.-P., Fowler, D., Fuzzi, S., Glasius, M., Granier, C., Hermann, M., Isaksen, I.S.A., Kinne, S.ac, Koren, I., Madonna, F., Maione, M., Massling, A., Moehler, O., Mona, L., Monks, P.S., Müller, D., Müller, T., Orphal, J., Peuch, V.-H., Stratmann, F., Tanré, D., Tyndall, G., Abo Riziq, A., Van Roozendael, M., Villani, P., Wehner, B., Wex, H., Zardini, A.A.   +104 more
openaire   +9 more sources

Complexity of downy birch emissions revealed by Vocus proton transfer reaction time-of-flight mass spectrometer

Frontiers in Forests and Global Change, 2022
Biogenic volatile organic compounds (BVOCs) are known to strongly influence the global climate by affecting various atmospheric constituents such as oxidants and aerosols. Among the several BVOCs that are emitted continuously into the atmosphere, studies
Steven Job Thomas, Steven Job Thomas, Haiyan Li, Arnaud P. Praplan, Heidi Hellén, Federico Bianchi   +5 more
doaj   +1 more source

Development of four-dimensional variational assimilation system based on the GRAPES–CUACE adjoint model (GRAPES–CUACE-4D-Var V1.0) and its application in emission inversion [PDF]

Geoscientific Model Development, 2021
In this study, a four-dimensional variational (4D-Var) data assimilation system was developed based on the GRAPES–CUACE (Global/Regional Assimilation and PrEdiction System – CMA Unified Atmospheric Chemistry Environmental Forecasting System) atmospheric ...
C. Wang, C. Wang, X. An, Q. Hou, Z. Sun, Y. Li, J. Li   +6 more
doaj   +1 more source

Sesquiterpenes and oxygenated sesquiterpenes dominate the VOC (C₅–C₂₀) emissions of downy birches [PDF]

Atmospheric Chemistry and Physics, 2021
Biogenic volatile organic compounds (BVOCs) emitted by the forests are known to have strong impacts in the atmosphere. However, lots of missing reactivity is found, especially in the forest air.
H. Hellén, A. P. Praplan, T. Tykkä, A. Helin, S. Schallhart, P. P. Schiestl-Aalto, P. P. Schiestl-Aalto, P. P. Schiestl-Aalto, J. Bäck, J. Bäck, H. Hakola   +10 more
doaj   +1 more source

Atmospheric composition in the European Arctic and 30 years of the Zeppelin Observatory, Ny-Ålesund

, 2021
. The Zeppelin Observatory (78.90° N, 11.88° E) is located on the Zeppelin Mountain at 472 m above sea level on Spitsbergen, the largest island of the Svalbard archipelago. Established in 1989, the observatory is part of the “Ny-Ålesund Research Station”
S. Platt, Ø. Hov, T. Berg, K. Breivik, S. Eckhardt, K. Eleftheriadis, N. Evangeliou, M. Fiebig, R. Fisher, G. Hansen, H. Hansson, J. Heintzenberg, O. Hermansen, Dominic Heslin-Rees, K. Holmén, S. Hudson, R. Kallenborn, R. Krejci, Terje Krognes, S. Larssen, D. Lowry, C. Lund Myhre, C. Lunder, E. Nisbet, Pernilla B. Nizetto, Ki‐Tae Park, C. Pedersen, Katrine Aspmo Pfaffhuber, T. Röckmann, N. Schmidbauer, S. Solberg, A. Stohl, J. Ström, T. Svendby, P. Tunved, K. Tørnkvist, C. van der Veen, S. Vratolis, Y. Yoon, K. Yttri, P. Zieger, W. Aas, K. Tørseth   +42 more
semanticscholar   +1 more source

THE COMPOSITION OF PLANETARY ATMOSPHERES [PDF]

Symposium - International Astronomical Union, 1981
During the past 10 years, great progress has been made in our knowledge of the planetary atmospheres, mainly due to the recent development of infrared techniques and space astronomy.
Th. Encrenaz, M. Combes
openaire   +2 more sources

Laboratory evaluation of particle-size selectivity of optical low-cost particulate matter sensors [PDF]

Atmospheric Measurement Techniques, 2020
Low-cost particulate matter (PM) sensors have been under investigation as it has been hypothesized that the use of low-cost and easy-to-use sensors could allow cost-efficient extension of the currently sparse measurement coverage.
J. Kuula, T. Mäkelä, M. Aurela, K. Teinilä, S. Varjonen, Ó. González, H. Timonen   +6 more
doaj   +1 more source