Document Detail


Describing the annual cyclic behaviour of 7Be concentrations in surface air in Oceania.
MedLine Citation:
PMID:  18375023     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Surface air concentrations of 7Be at a number of stations in Oceania show a distinct annual cycle. We apply a sinusoidal model to describe this cycle. The results show that peak 7Be concentrations in surface air occur during early spring at tropical latitudes and during mid-to-late summer at middle latitudes. Comparison with available 90Sr surface air data for the southern hemisphere indicates that stratosphere-to-troposphere exchange is an active atmospheric process controlling the 7Be annual cycle throughout the Oceania region. Vertical transport of air within the troposphere also seems to influence the observed annual cycle. Seasonality in rainfall is not thought to control the annual cyclic behaviour of 7Be in surface air.
Authors:
Che Doering; Riaz Akber
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Publication Detail:
Type:  Journal Article     Date:  2008-03-28
Journal Detail:
Title:  Journal of environmental radioactivity     Volume:  99     ISSN:  0265-931X     ISO Abbreviation:  J Environ Radioact     Publication Date:  2008 Oct 
Date Detail:
Created Date:  2008-09-01     Completed Date:  2009-01-26     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8508119     Medline TA:  J Environ Radioact     Country:  England    
Other Details:
Languages:  eng     Pagination:  1703-7     Citation Subset:  IM    
Affiliation:
Radiological Laboratory, School of Physical and Chemical Sciences, Queensland University of Technology, 2 George Street, Brisbane, Qld. 4000, Australia.
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MeSH Terms
Descriptor/Qualifier:
Air Pollutants, Radioactive / analysis*
Beryllium / analysis*
Geography
Oceania
Radiation Monitoring / methods
Radioisotopes / analysis*
Seasons
Chemical
Reg. No./Substance:
0/Air Pollutants, Radioactive; 0/Radioisotopes; 7440-41-7/Beryllium

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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