Results 1 to 10 of about 539,558 (160)

Aerosol size distribution seasonal characteristics measured in Tiksi, Russian Arctic [PDF]

Atmospheric Chemistry and Physics, 2016
Four years of continuous aerosol number size distribution measurements from the Arctic Climate Observatory in Tiksi, Russia, are analyzed. Tiksi is located in a region where in situ information on aerosol particle properties has not been previously ...
E. Asmi, V. Kondratyev, V. Kondratyev, D. Brus, T. Laurila, H. Lihavainen, J. Backman, V. Vakkari, M. Aurela, J. Hatakka, Y. Viisanen, T. Uttal, V. Ivakhov, A. Makshtas   +13 more
doaj   +1 more source

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 In this study we combined published Norway spruce emission rates measured in boreal forests and added our new, unpublished emission data from Southern (SF ...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

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

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

Observations of relative humidity effects on aerosol light scattering in the Yangtze River Delta of China [PDF]

Atmospheric Chemistry and Physics, 2015
Scattering of solar radiation by aerosol particles is highly dependent on relative humidity (RH) as hygroscopic particles take up water with increasing RH.
L. Zhang, J. Y. Sun, X. J. Shen, Y. M. Zhang, H. Che, Q. L. Ma, Y. W. Zhang, X. Y. Zhang, J. A. Ogren   +8 more
doaj   +1 more source

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

Perspectives on atmospheric evolution from noble gas and nitrogen isotopes on Earth, Mars & Venus [PDF]

Space Science Reviews 216 (2020) 36, 2020
The composition of an atmosphere has integrated the geological history of the entire planetary body. However, the long-term evolutions of the atmospheres of the terrestrial planets are not well documented. For Earth, there were until recently only few direct records of atmosphere's composition in the distant past, and insights came mainly from ...
arxiv   +1 more source