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| Titel |
Evaluating radon-derived mixing depth as a potential length scale for nocturnal mixing processes over land |
| VerfasserIn |
Scott Chambers, Alastair Williams, Wlodek Zahorowski, Alan Griffiths |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250034846
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| Zusammenfassung |
| To evaluate, and ultimately improve, numerical schemes for vertical mixing and exchange
within the atmospheric boundary layer, and in particular the nocturnal boundary layer, it is
necessary to quantify mixing processes within the lower atmosphere at a temporal resolution
sufficient to resolve the diurnal cycle. One way to quantitatively characterize near-surface
mixing on diurnal time scales is to make continuous, high temporal resolution vertical
gradient measurements of a suitable atmospheric tracer. Radon-222 (radon) is a naturally
occurring, radioactive, noble gas that is poorly soluble in water. It has a relatively uniform
terrestrial source function and its only significant atmospheric sink is radioactive
decay. Radon’s 3.8-day half-life is also ideal for atmospheric boundary layer mixing
studies, being much larger than turbulent timescales ( |
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