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dc.contributor.author
Karstens, Ute
dc.contributor.author
Schwingshackl, Clemens
dc.contributor.author
Schmithüsen, Dominik
dc.contributor.author
Levin, Ingeborg
dc.date.accessioned
2018-10-30T12:46:18Z
dc.date.available
2017-06-11T21:26:36Z
dc.date.available
2018-10-30T12:46:18Z
dc.date.issued
2015
dc.identifier.issn
1680-7375
dc.identifier.issn
1680-7367
dc.identifier.other
10.5194/acp-15-12845-2015
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/107430
dc.identifier.doi
10.3929/ethz-b-000107430
dc.description.abstract
Detailed 222radon (222Rn) flux maps are an essential pre-requisite for the use of radon in atmospheric transport studies. Here we present a high-resolution 222Rn flux map for Europe, based on a parameterization of 222Rn production and transport in the soil. The 222Rn exhalation rate is parameterized based on soil properties, uranium content, and modelled soil moisture from two different land-surface reanalysis data sets. Spatial variations in exhalation rates are primarily determined by the uranium content of the soil, but also influenced by soil texture and local water-table depth. Temporal variations are related to soil moisture variations as the molecular diffusion in the unsaturated soil zone depends on available air-filled pore space. The implemented diffusion parameterization was tested against campaign-based 222Rn soil profile measurements. Monthly 222Rn exhalation rates from European soils were calculated with a nominal spatial resolution of 0.083° × 0.083° and compared to long-term direct measurements of 222Rn exhalation rates in different areas of Europe. The two realizations of the 222Rn flux map, based on the different soil moisture data sets, both realistically reproduce the observed seasonality in the fluxes but yield considerable differences for absolute flux values. The mean 222Rn flux from soils in Europe is estimated to be 10 mBq m−2 s−1 (ERA-Interim/Land soil moisture) or 15 mBq m−2 s−1 (GLDAS (Global Land Data Assimilation System) Noah soil moisture) for the period 2006–2010. The corresponding seasonal variations with low fluxes in winter and high fluxes in summer range in the two realizations from ca. 7 to ca. 14 mBq m−2 s−1 and from ca. 11 to ca. 20 mBq m−2 s−1, respectively. These systematic differences highlight the importance of realistic soil moisture data for a reliable estimation of 222Rn exhalation rates. Comparison with observations suggests that the flux estimates based on the GLDAS Noah soil moisture model on average better represent observed fluxes.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Copernicus
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/3.0/
dc.title
A process-based 222radon flux map for Europe and its comparison to long-term observations
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 3.0 Unported
dc.date.published
2015-11-19
ethz.journal.title
Atmospheric Chemistry and Physics
ethz.journal.volume
15
en_US
ethz.journal.issue
22
en_US
ethz.journal.abbreviated
Atmos. chem. phys.
ethz.pages.start
12845
en_US
ethz.pages.end
12865
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.scopus
ethz.identifier.nebis
004294181
ethz.publication.place
Göttingen
en_US
ethz.publication.status
published
en_US
ethz.date.deposited
2017-06-11T21:27:42Z
ethz.source
ECIT
ethz.identifier.importid
imp593653bac11a567720
ethz.ecitpid
pub:168026
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-07-15T18:52:07Z
ethz.rosetta.lastUpdated
2020-02-15T15:41:33Z
ethz.rosetta.versionExported
true
ethz.COinS
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