Format

Send to

Choose Destination
See comment in PubMed Commons below
J Environ Radioact. 2014 Jan;127:111-8. doi: 10.1016/j.jenvrad.2013.10.003. Epub 2013 Oct 30.

Variability of atmospheric krypton-85 activity concentrations observed close to the ITCZ in the southern hemisphere.

Author information

1
Environmental Research Institute of the Supervising Scientist (eriss), Department of the Environment, PO Box 461, Darwin, NT 0801, Australia. Electronic address: Andreas.bollhoefer@environment.gov.au.

Abstract

Krypton-85 activity concentrations in surface air have been measured at Darwin, which is located in northern Australia and is influenced by seasonal monsoonal activity. Measurements between August 2007 and May 2010 covered three wet seasons. The mean activity concentration of krypton-85 measured during this period was 1.31±0.02Bqm(-3). A linear model fitted to the average monthly data, using month and monsoon as predictors, shows that krypton-85 activity concentration measured during the sampling period has declined by 0.01Bqm(-3) per year. Although there is no statistically significant difference in mean activity concentration of krypton-85 between wet and dry season, the model implies that activity concentration is higher by about 0.015Bqm(-3) during months influenced by the monsoon when a north westerly flow prevails. Backward dispersion runs using the Lagrangian particle dispersion model Hysplit4 highlight possible source regions during an active monsoon located deep in the northern hemisphere, and include reprocessing facilities in Japan and India. However, the contribution of these facilities to krypton-85 activity concentrations in Darwin would be less than 0.003Bqm(-3).

KEYWORDS:

Atmospheric transport; Krypton-85; Monsoon; Southern hemisphere

PMID:
24184817
DOI:
10.1016/j.jenvrad.2013.10.003
[Indexed for MEDLINE]
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Elsevier Science
    Loading ...
    Support Center