Short-term production and synoptic influences on atmospheric Be-7 concentrations
2009 (English)In: Journal of Geophysical Research, ISSN 0148-0227, E-ISSN 2156-2202, Vol. 114, D06108- p.Article in journal (Refereed) Published
Variations of the cosmogenic radionuclide Be-7 in the global atmosphere are driven by cooperation of processes of its production, air transports, and removal. We use a combination of the Goddard Institute for Space Studies ModelE and the OuluCRAC: Be-7 production model to simulate the variations in the Be-7 concentration in the atmosphere for the period from 1 January to 28 February 2005. This period features significant synoptic variability at multiple monitoring stations around the globe and spans an extreme solar energetic particle (SEP) event that occurred on 20 January. Using nudging from observed horizontal winds, the model correctly reproduces the overall level of the measured Be-7 concentration near ground and a great deal of the synoptic variability at timescales of 4 days and longer. This verifies the combined model of production and transport of the Be-7 radionuclide in the atmosphere. The impact of an extreme SEP event of January 2005 is seen dramatically in polar stratospheric Be-7 concentration but is small near the surface (about 2%) and indistinguishable given the amount of intrinsic variability and the uncertainties of the surface observations.
Place, publisher, year, edition, pages
2009. Vol. 114, D06108- p.
Physical Sciences Engineering and Technology
Research subject Ion Physics
IdentifiersURN: urn:nbn:se:uu:diva-122051DOI: 10.1029/2008JD011333ISI: 000264439700008OAI: oai:DiVA.org:uu-122051DiVA: diva2:308353