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| Titel |
Improved mixing height monitoring through a combination of lidar and radon measurements |
| VerfasserIn |
A. D. Griffiths, S. D. Parkes, S. D. Chambers, M. F. McCabe, A. G. Williams |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 6, no. 2 ; Nr. 6, no. 2 (2013-02-01), S.207-218 |
| Datensatznummer |
250017382
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| Publikation (Nr.) |
 copernicus.org/amt-6-207-2013.pdf |
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| Zusammenfassung |
Surface-based radon (222Rn) measurements can be combined with lidar
backscatter to obtain a higher quality time series of mixing height within
the planetary boundary layer (PBL) than is possible from lidar alone, and a
more quantitative measure of mixing height than is possible from only radon.
The reason why lidar measurements are improved is that there are times when
lidar signals are ambiguous, and reliably attributing the mixing height to the
correct aerosol layer presents a challenge. By combining lidar with a mixing
length scale derived from a time series of radon concentration, automated and
robust attribution is possible during the morning transition.
Radon measurements provide mixing information during the night, but
concentrations also depend on the strength of surface emissions. After
processing radon in combination with lidar, we obtain nightly measurements of
radon emissions and are able to normalise the mixing length scale for
changing emissions. After calibration with lidar, the radon-derived
equivalent mixing height agrees with other measures of mixing on daily and
hourly timescales and is a potential method for studying intermittent mixing
in nocturnal boundary layers. |
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