Short-term production and synoptic influences on atmospheric7Be concentrations

Ilya G. Usoskin, Christy V. Field, Gavin A. Schmidt, Ari Pekka Leppänen, Ala Aldahan, Gennady A. Kovaltsov, Goran Possnert, R. Kurt Ungar

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)

Abstract

Variations of the cosmogenic radionuclide 7Be 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 Model E and the OuluCRAC:7Be production model to simulate the variations in the 7Be 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 7Be 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 7Be radionuclide in the atmosphere. The impact of an extreme SEP event of January 2005 is seen dramatically in polar stratospheric 7Be concentration but is small near the surface (about 2%) and indistinguishable given the amount of intrinsic variability and the uncertainties of the surface observations.

Original languageEnglish
Pages (from-to)D06108
JournalJournal of Geophysical Research Atmospheres
Volume114
Issue number6
DOIs
Publication statusPublished - Mar 27 2009

ASJC Scopus subject areas

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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