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		<doi>10.1016/j.jastp.2010.06.006</doi>
		<issn>1364-6826</issn>
		<citationkey>LeppänenPUAEEKKMP:2010:CoMiPr</citationkey>
		<title>Cosmogenic 7Be in air: A complex mixture of production and transport</title>
		<year>2010</year>
		<month>1036-1043</month>
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		<author>Leppänen, A. -P.,</author>
		<author>Pacini, A. A.,</author>
		<author>Usoskinc, I. G.,</author>
		<author>Aldahan, A.,</author>
		<author>Echer, A.,</author>
		<author>Evangelista, H.,</author>
		<author>Klemola, H. S.,</author>
		<author>Kovaltsov, G. A.,</author>
		<author>Mursula, K.,</author>
		<author>Possnert, G.,</author>
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		<affiliation>Regional Laboratory in Northern Finland, Radiation and Nuclear Safety Authority, Lähteentie 2, 96400 Rovaniemi, Finland</affiliation>
		<affiliation>Instituto Nacional de Pesquisas Espaciais (INPE) University of Rio de Janeiro State, Rio de Janeiro, Brazil</affiliation>
		<affiliation>Sodankylä Geophysical Observatory, University of Oulu, Oulu, Finland</affiliation>
		<affiliation>Institute of Earth Sciences, University of Uppsala, Sweden</affiliation>
		<affiliation>Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<affiliation>University of Rio de Janeiro State, Rio de Janeiro, Brazil</affiliation>
		<affiliation>Radionuclide Analytics, Radiation and Nuclear Safety Authority, Helsinki, Finland</affiliation>
		<affiliation>Ioffe Physical–Technical Institute, St. Petersburg, Russia</affiliation>
		<affiliation>Department of Physics, University of Oulu, Oulu, Finland</affiliation>
		<affiliation>Tandem Laboratory, University of Uppsala, Uppsala, Sweden</affiliation>
		<journal>Journal of Atmospheric and Solar-Terrestrial Physics</journal>
		<volume>72</volume>
		<number>13</number>
		<pages>Aug.</pages>
		<secondarytype>PRE PI</secondarytype>
		<secondarymark>B2_ASTRONOMIA_/_FÍSICA B1_CIÊNCIAS_BIOLÓGICAS_I B1_ECOLOGIA_E_MEIO_AMBIENTE B1_ENGENHARIAS_IV B1_GEOCIÊNCIAS A2_INTERDISCIPLINAR</secondarymark>
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		<contenttype>External Contribution</contenttype>
		<keywords>Cosmogenic isotopes, Cosmic rays, Atmosphere, 7Be, NAO, SAM.</keywords>
		<abstract>The long-time series of 7Be activity in surface air have been studied with the wavelet analysis technique in order to find coherence between 7Be activity, theoretical production in the troposphere and climatic indices. The 7Be activity were obtained from five different locations, Angra in the tropics in Brazil, Skåne in mid-latitudes in Southern Sweden, Kiruna in Polar region in Northern Sweden, Loviisa in Southern Finland and Rovaniemi in polar region in Northern Finland. The 7Be data from the Northern hemisphere sites where tested for coherence with theoretical production of the isotope in troposphere and with the North Atlantic Oscillation index. In the Southern hemisphere separate theoretical production was calculated in order to describe local production and Southern Annular Mode was used as the climatic index. Consistent and significant coherence were found with theoretical production at Skåne, Kiruna and Loviisa at time-scales of four years or longer. At Angra and Rovaniemi sites, no coherence was detected between 7Be theoretical tropospheric production and measured activity at ground level. The coherence between 7Be data from Skåne and Angra and climatic indices is insignificant while data from Northern and Eastern Scandinavia show clear coherence with climatic indices at time-scales of four years or longer. Additionally, significant coherence was found between the cosmic ray induced production and NAO at the time band of 812 years whereas the coherence between cosmic ray induced production and SAM was insignificant. This feature implies that the ground level 7Be activity contain mixed information on both production and transport. This conclusion means that further evaluation through models which enable accurate realistic models that will be investigated in future studies.</abstract>
		<area>CEA</area>
		<language>en</language>
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