Zobrazeno 1 - 10
of 374
pro vyhledávání: '"P Virkkula"'
Autor:
S. Basnet, A. Hartikainen, A. Virkkula, P. Yli-Pirilä, M. Kortelainen, H. Suhonen, L. Kilpeläinen, M. Ihalainen, S. Väätäinen, J. Louhisalmi, M. Somero, J. Tissari, G. Jakobi, R. Zimmermann, A. Kilpeläinen, O. Sippula
Publikováno v:
Atmospheric Chemistry and Physics, Vol 24, Pp 3197-3215 (2024)
Residential biomass combustion significantly contributes to light-absorbing carbonaceous aerosols in the atmosphere, impacting the earth's radiative balance at regional and global levels. This study investigates the contribution of brown carbon (BrC)
Externí odkaz:
https://doaj.org/article/0b17be3ad14e4f7cb33df25eb0929ce6
Photoacoustic detection is a sensitive method for measurement of light-absorbing particles directly in the aerosol phase. In this article, we demonstrate a new sensitive technique for photoacoustic aerosol absorption measurements using a cantilever m
Externí odkaz:
http://arxiv.org/abs/2106.12389
Autor:
Jonas Svensson, Leena Leppänen, Henna-Reetta Hannula, Anna Kontu, Yi-cheng Shen, Outi Meinander, Pavla Dagsson-Waldhauserová, Arunas Mesceriakovas, Enna Heikkinen, Meri Ruppel, Olli Sippula, Johan Ström, Eija Asmi, Aki Virkkula
Publikováno v:
Frontiers in Earth Science, Vol 12 (2024)
The absorption of shortwave irradiance in snow depends on the physical properties of snow (e.g., snow grain size and shape, liquid water content, etc.) and light-absorbing particles (LAP). Originating from natural and anthropogenic sources, LAP has b
Externí odkaz:
https://doaj.org/article/b974e1c216e14892bb7777652311bc24
Akademický článek
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Autor:
A. Virkkula, H. Grythe, J. Backman, T. Petäjä, M. Busetto, C. Lanconelli, A. Lupi, S. Becagli, R. Traversi, M. Severi, V. Vitale, P. Sheridan, E. Andrews
Publikováno v:
Atmospheric Chemistry and Physics, Vol 22, Pp 5033-5069 (2022)
Optical properties of surface aerosols at Dome C, Antarctica, in 2007–2013 and their potential source areas are presented. Scattering coefficients (σsp) were calculated from measured particle number size distributions with a Mie code and from filt
Externí odkaz:
https://doaj.org/article/fa5c4ad32faf4cd09e2ffa86fb43d1e2
Autor:
H. K. Lappalainen, T. Petäjä, T. Vihma, J. Räisänen, A. Baklanov, S. Chalov, I. Esau, E. Ezhova, M. Leppäranta, D. Pozdnyakov, J. Pumpanen, M. O. Andreae, M. Arshinov, E. Asmi, J. Bai, I. Bashmachnikov, B. Belan, F. Bianchi, B. Biskaborn, M. Boy, J. Bäck, B. Cheng, N. Chubarova, J. Duplissy, E. Dyukarev, K. Eleftheriadis, M. Forsius, M. Heimann, S. Juhola, V. Konovalov, I. Konovalov, P. Konstantinov, K. Köster, E. Lapshina, A. Lintunen, A. Mahura, R. Makkonen, S. Malkhazova, I. Mammarella, S. Mammola, S. Buenrostro Mazon, O. Meinander, E. Mikhailov, V. Miles, S. Myslenkov, D. Orlov, J.-D. Paris, R. Pirazzini, O. Popovicheva, J. Pulliainen, K. Rautiainen, T. Sachs, V. Shevchenko, A. Skorokhod, A. Stohl, E. Suhonen, E. S. Thomson, M. Tsidilina, V.-P. Tynkkynen, P. Uotila, A. Virkkula, N. Voropay, T. Wolf, S. Yasunaka, J. Zhang, Y. Qiu, A. Ding, H. Guo, V. Bondur, N. Kasimov, S. Zilitinkevich, V.-M. Kerminen, M. Kulmala
Publikováno v:
Atmospheric Chemistry and Physics, Vol 22, Pp 4413-4469 (2022)
The Pan-Eurasian Experiment (PEEX) Science Plan, released in 2015, addressed a need for a holistic system understanding and outlined the most urgent research needs for the rapidly changing Arctic-boreal region. Air quality in China, together with the
Externí odkaz:
https://doaj.org/article/63cca6462f0a4cd29251ffda3f1f3530
Publikováno v:
Atmospheric Measurement Techniques, Vol 14, Pp 6419-6441 (2021)
We present a comparison between three absorption photometers that measured the absorption coefficient (σabs) of ambient aerosol particles in 2012–2017 at SMEAR II (Station for Measuring Ecosystem–Atmosphere Relations II), a measurement station l
Externí odkaz:
https://doaj.org/article/1de26f2c04254441b9ff22c35a11e8b9
Autor:
E. Asmi, J. Backman, H. Servomaa, A. Virkkula, M. I. Gini, K. Eleftheriadis, T. Müller, S. Ohata, Y. Kondo, A. Hyvärinen
Publikováno v:
Atmospheric Measurement Techniques, Vol 14, Pp 5397-5413 (2021)
Aerosol light absorption was measured during a 1-month field campaign in June–July 2019 at the Pallas Global Atmospheric Watch (GAW) station in northern Finland. Very low aerosol concentrations prevailed during the campaign, which posed a challenge
Externí odkaz:
https://doaj.org/article/e87ee00b4aac44f0b0ea90561d047508
Autor:
Mikko Nuutinen, Annina Lyly, Paula Virkkula, Maija Hytönen, Elmo Saarentaus, Antti Mäkitie, Aarno Palotie, Paulus Torkki, Jari Haukka, Sanna Toppila‐Salmi
Publikováno v:
Clinical and Translational Allergy, Vol 12, Iss 7, Pp n/a-n/a (2022)
Abstract Background The aim was to evaluate the relative proportion of Non‐steroidal anti‐inflammatory drug exacerbated respiratory disease (NERD) and other comorbidities, and their impact on the burden of outpatient visits due to allergic rhinit
Externí odkaz:
https://doaj.org/article/3dc54c8008c040a380188624b00befaf
Autor:
A. Virkkula
Publikováno v:
Atmospheric Measurement Techniques, Vol 14, Pp 3707-3719 (2021)
The Aethalometer model has been used widely for estimating the contributions of fossil fuel emissions and biomass burning to equivalent black carbon (eBC). The calculation is based on measured absorption Ångström exponents (αabs). The interpretati
Externí odkaz:
https://doaj.org/article/893add9c621042f49db2de3d33020581