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| Titel |
Infrared and millimetre-wave scintillometry in the suburban environment – Part 2: Large-area sensible and latent heat fluxes |
| VerfasserIn |
H. C. Ward, J. G. Evans, C. S. B. Grimmond |
| 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 ; 8, no. 3 ; Nr. 8, no. 3 (2015-03-20), S.1407-1424 |
| Datensatznummer |
250116224
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| Publikation (Nr.) |
 copernicus.org/amt-8-1407-2015.pdf |
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| Zusammenfassung |
| A millimetre-wave scintillometer was paired with an infrared scintillometer,
enabling estimation of large-area evapotranspiration across northern
Swindon, a suburban area in the UK. Both sensible and latent heat fluxes can
be obtained using this "two-wavelength" technique, as it is able to provide
both temperature and humidity structure parameters, offering a major
advantage over conventional single-wavelength scintillometry. The first
paper of this two-part series presented the measurement theory and
structure parameters. In this second paper, heat fluxes are obtained
and analysed. These fluxes, estimated using two-wavelength scintillometry
over an urban area, are the first of their kind. Source area modelling
suggests the scintillometric fluxes are representative of 5–10 km2. For
comparison, local-scale (0.05–0.5 km2) fluxes were measured by an eddy
covariance station. Similar responses to seasonal changes are evident at the
different scales but the energy partitioning varies between source areas.
The response to moisture availability is explored using data from 2 consecutive years with contrasting rainfall patterns (2011–2012). This
extensive data set offers insight into urban surface-atmosphere interactions
and demonstrates the potential for two-wavelength scintillometry to deliver
fluxes over mixed land cover, typically representative of an area 1–2 orders
of magnitude greater than for eddy covariance measurements. Fluxes at this
scale are extremely valuable for hydro-meteorological model evaluation and
assessment of satellite data products. |
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