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1. Interactions between the atmosphere, cryosphere, and ecosystems at northern high latitudes

Author

Boy, Michael, primary, Thomson, Erik S., additional, Acosta Navarro, Juan-C., additional, Arnalds, Olafur, additional, Batchvarova, Ekaterina, additional, Bäck, Jaana, additional, Berninger, Frank, additional, Bilde, Merete, additional, Brasseur, Zoé, additional, Dagsson-Waldhauserova, Pavla, additional, Castarède, Dimitri, additional, Dalirian, Maryam, additional, de Leeuw, Gerrit, additional, Dragosics, Monika, additional, Duplissy, Ella-Maria, additional, Duplissy, Jonathan, additional, Ekman, Annica M. L., additional, Fang, Keyan, additional, Gallet, Jean-Charles, additional, Glasius, Marianne, additional, Gryning, Sven-Erik, additional, Grythe, Henrik, additional, Hansson, Hans-Christen, additional, Hansson, Margareta, additional, Isaksson, Elisabeth, additional, Iversen, Trond, additional, Jonsdottir, Ingibjorg, additional, Kasurinen, Ville, additional, Kirkevåg, Alf, additional, Korhola, Atte, additional, Krejci, Radovan, additional, Kristjansson, Jon Egill, additional, Lappalainen, Hanna K., additional, Lauri, Antti, additional, Leppäranta, Matti, additional, Lihavainen, Heikki, additional, Makkonen, Risto, additional, Massling, Andreas, additional, Meinander, Outi, additional, Nilsson, E. Douglas, additional, Olafsson, Haraldur, additional, Pettersson, Jan B. C., additional, Prisle, Nønne L., additional, Riipinen, Ilona, additional, Roldin, Pontus, additional, Ruppel, Meri, additional, Salter, Matthew, additional, Sand, Maria, additional, Seland, Øyvind, additional, Seppä, Heikki, additional, Skov, Henrik, additional, Soares, Joana, additional, Stohl, Andreas, additional, Ström, Johan, additional, Svensson, Jonas, additional, Swietlicki, Erik, additional, Tabakova, Ksenia, additional, Thorsteinsson, Throstur, additional, Virkkula, Aki, additional, Weyhenmeyer, Gesa A., additional, Wu, Yusheng, additional, Zieger, Paul, additional, and Kulmala, Markku, additional

Published
2019
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2. Interactions between the atmosphere, cryosphere and ecosystems at northern high latitudes

Author

Boy, Michael, primary, Thomson, Erik S., additional, Acosta Navarro, Juan-C., additional, Arnalds, Olafur, additional, Batchvarova, Ekaterina, additional, Bäck, Jaana, additional, Berninger, Frank, additional, Bilde, Merete, additional, Dagsson-Waldhauserova, Pavla, additional, Castarède, Dimitri, additional, Dalirian, Maryam, additional, de Leeuw, Gerrit, additional, Dragosics, Monika, additional, Duplissy, Ella-Maria, additional, Duplissy, Jonathan, additional, Ekman, Annica M. L., additional, Fang, Keyan, additional, Gallet, Jean-Charles, additional, Glasius, Marianne, additional, Gryning, Sven-Erik, additional, Grythe, Henrik, additional, Hansson, Hans-Christen, additional, Hansson, Margareta, additional, Isaksson, Elisabeth, additional, Iversen, Trond, additional, Jonsdottir, Ingibjorg, additional, Kasurinen, Ville, additional, Kirkevåg, Alf, additional, Korhola, Atte, additional, Krejci, Radovan, additional, Kristjansson, Jon Egill, additional, Lappalainen, Hanna K., additional, Lauri, Antti, additional, Leppäranta, Matti, additional, Lihavainen, Heikki, additional, Makkonen, Risto, additional, Massling, Andreas, additional, Meinander, Outi, additional, Nilsson, E. Douglas, additional, Olafsson, Haraldur, additional, Pettersson, Jan B. C., additional, Prisle, Nønne L., additional, Riipinen, Ilona, additional, Roldin, Pontus, additional, Ruppel, Meri, additional, Salter, Matthew, additional, Sand, Maria, additional, Seland, Øyvind, additional, Seppä, Heikki, additional, Skov, Henrik, additional, Soares, Joana, additional, Stohl, Andreas, additional, Ström, Johan, additional, Svensson, Jonas, additional, Swietlicki, Erik, additional, Tabakova, Ksenia, additional, Thorsteinsson, Throstur, additional, Virkkula, Aki, additional, Weyhenmeyer, Gesa A., additional, Wu, Yusheng, additional, Zieger, Paul, additional, and Kulmala, Markku, additional

Published
2018
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3. Development of a new methane tracer: kinetic isotope effect of [superscript 13]CH[subscript 3]D + OH from 278 to 313 K

Author

Joelsson, L. M. T., Schmidt, J. A., Nilsson, E. J. K., Blunier, T., Griffith, D. W. T., Johnson, M. S., Ono, Shuhei, Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences, and Ono, Shuhei

Abstract

Methane is the second most important long-lived greenhouse gas and plays a central role in the chemistry of the Earth’s atmosphere. Nonetheless there are significant uncertainties in its source budget. Analysis of the isotopic composition of atmospheric methane, including the doubly substituted species [superscript 13]CH[subscript 3]D, offers new insight into the methane budget as the sources and sinks have distinct isotopic signatures. The most important sink of atmospheric methane is oxidation by OH in the troposphere, which accounts for around 84 % of all methane removal. Here we present experimentally derived methane + OH kinetic isotope effects and their temperature dependence over the range of 278 to 313 K for CH[subscript 3]D and [superscript 13]CH[subscript 3]D; the latter is reported here for the first time. We find k[suscript CH[subscript 4]]/k[subscript CH[subscript 3]D] = 1.31±0.01 and k[subscript CH[subscript 4]]/k[subscript 13[subscript CH[subscript 3]D]] = 1.34±0.03 at room temperature, implying that the methane + OH kinetic isotope effect is multiplicative such that (k[subscript CH[subscript 4]]/k[subscript 13[subscript CH[subscript 4]]] )(k[subscript CH[subscript 4]]/k[subscript CH[subscript 3]D]]) = k[subscript CH[subscript 4]]/k[subscript 13[subscript CH[subscript 3]D]], within the experimental uncertainty, given the literature value of k[subscript CH[subscript 4]]/k[subscript 13[subscript CH[subscript 4]]] = 1.0039 ± 0.0002. In addition, the kinetic isotope effects were characterized using transition state theory with tunneling corrections. Good agreement between the experimental, quantum chemical, and available literature values was obtained. Based on the results we conclude that the OH reaction (the main sink of methane) at steady state can produce an atmospheric clumped isotope signal (Δ([superscript 13]CH[subscript 3]D) = ln([CH[subscript 4]][[superscript 13]CH[subscript 3]D]/[ [superscript 13]CH[subscript 4]][CH[subscript 3]D])) of 0.02 ± 0.02. This implies that the bulk tropospheric Δ([superscript 13]CH[subscript 3]D) reflects the source signal with relatively small adjustment due to the sink signal (i.e., mainly OH oxidation)., Seventh Framework Programme (European Commission) (Grant 237890), Carlsberg Foundation, Danish Council for Independent Research

Published
2016

4. Kinetic isotope effects of 12CH3D + OH and 13CH3D + OH from 278 to 313 K

Author

Joelsson, L. M. T., Schmidt, J. A., Nilsson, E. J. K., Blunier, T., Griffith, D. W. T., Johnson, M. S., Ono, Shuhei, Massachusetts Institute of Technology. Department of Civil and Environmental Engineering, and Ono, Shuhei

Abstract

Methane is the second most important long-lived greenhouse gas and plays a central role in the chemistry of the Earth's atmosphere. Nonetheless there are significant uncertainties in its source budget. Analysis of the isotopic composition of atmospheric methane, including the doubly substituted species [superscript 13]CH[subscript 3]D, offers new insight into the methane budget as the sources and sinks have distinct isotopic signatures. The most important sink of atmospheric methane is oxidation by OH in the troposphere, which accounts for around 84 % of all methane removal. Here we present experimentally derived methane + OH kinetic isotope effects and their temperature dependence over the range of 278 to 313 K for CH[subscript 3]D and [superscript 13]CH[subscript 3]D; the latter is reported here for the first time. We find k[subscript CH[subscript 4]]/k[subscript CH[subscript 3]D] = 1.31 ± 0.01 and k[subscript CH[subscript 4]]/k[subscript 13[subscript CH[subscript 3]D]]] = 1.34 ± 0.03 at room temperature, implying that the methane + OH kinetic isotope effect is multiplicative such that (k[subscript CH[subscript 4]]/k[subscript 13[subscript CH[subscript 4]]])(k[subscript CH[subscript 4]]/k[subscript CH[subscript 3]D]) = k[subscript CH[subscript 4]]/k[subscript 13[subscript CH[subscript 3]D]], within the experimental uncertainty, given the literature value of k[subscript CH[subscript 4]]/k[subscript 13[subscript CH[subscript 4]]] = 1.0039 ± 0.0002. In addition, the kinetic isotope effects were characterized using transition state theory with tunneling corrections. Good agreement between the experimental, quantum chemical, and available literature values was obtained. Based on the results we conclude that the OH reaction (the main sink of methane) at steady state can produce an atmospheric clumped isotope signal (Δ([superscript 13]CH[subscript 3]D) = ln([CH[subscript 4]][[superscript 13]CH[subscript 3]D]/[[superscript 13]CH[subscript 4]][CH[subscript 3]D])) of 0.02 ± 0.02. This implies that the bulk tropospheric Δ([superscript 13]CH[subscript 3]D) reflects the source signal with relatively small adjustment due to the sink signal (i.e., mainly OH oxidation).

Published
2016

14. Concentrations and fluxes of aerosol particles during the LAPBIAT measurement campaign in Värriö field station

Author

Ruuskanen, T. M., Kaasik, M., Aalto, P. P., Hõrrak, U., Vana, M., Mårtensson, M., Yoon, Y. J., Keronen, P., Mordas, G., Ceburnis, D., Nilsson, E. D., O'Dowd, C., Noppel, M., Alliksaar, T., Ivask, J., Sofiev, M., Prank, M., Kulmala, M., and EGU, Publication

Subjects
[SDU.OCEAN] Sciences of the Universe [physics]/Ocean, Atmosphere
Abstract

The LAPBIAT measurement campaign took place in the SMEAR I measurement station located in Eastern Lapland in the spring of 2003 between 26 April and 11 May. In this paper we describe the measurement campaign, concentrations and fluxes of aerosol particles, air ions and trace gases, paying special attention to an aerosol particle formation event broken by a polluted air mass approaching from industrial areas of Kola Peninsula, Russia. Aerosol particle number flux measurements show strong downward fluxes during that time. Concentrations of coarse aerosol particles were high for 1–2 days before the nucleation event (i.e. 28–29 April), very low immediately before and during the observed aerosol particle formation event (30 April) and increased moderately from the moment of sudden break of the event. In general particle deposition measurements based on snow samples show the same changes. Measurements of the mobility distribution of air ions showed elevated concentrations of intermediate air ions during the particle formation event. We estimated the growth rates in the nucleation mode size range. For particles

Published
2007

42. Concentrations and fluxes of aerosol particles during the LAPBIAT measurement campaign at Värriö field station

Author

Ruuskanen, T. M., primary, Kaasik, M., additional, Aalto, P. P., additional, Hõrrak, U., additional, Vana, M., additional, Mårtensson, M., additional, Yoon, Y. J., additional, Keronen, P., additional, Mordas, G., additional, Ceburnis, D., additional, Nilsson, E. D., additional, O'Dowd, C., additional, Noppel, M., additional, Alliksaar, T., additional, Ivask, J., additional, Sofiev, M., additional, Prank, M., additional, and Kulmala, M., additional

Published
2007
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46. Concentrations and fluxes of aerosol particles during the LAPBIAT measurement campaign in Värriö field station

Author

Ruuskanen, T. M., primary, Kaasik, M., additional, Aalto, P. P., additional, Hõrrak, U., additional, Vana, M., additional, Mårtensson, M., additional, Yoon, Y. J., additional, Keronen, P., additional, Mordas, G., additional, Ceburnis, D., additional, Nilsson, E. D., additional, O'Dowd, C., additional, Noppel, M., additional, Alliksaar, T., additional, Ivask, J., additional, Sofiev, M., additional, Prank, M., additional, and Kulmala, M., additional

Published
2007
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