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| Titel |
The effect of misleading surface temperature estimations on the sensible heat fluxes at a high Arctic site – the Arctic Turbulence Experiment 2006 on Svalbard (ARCTEX-2006) |
| VerfasserIn |
J. Lüers, J. Bareiss |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 10, no. 1 ; Nr. 10, no. 1 (2010-01-11), S.157-168 |
| Datensatznummer |
250007898
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| Publikation (Nr.) |
 copernicus.org/acp-10-157-2010.pdf |
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| Zusammenfassung |
| The observed rapid climate warming in the Arctic requires improvements in
permafrost and carbon cycle monitoring, accomplished by setting up long-term
observation sites with high-quality in-situ measurements of turbulent heat,
water and carbon fluxes as well as soil physical parameters in Arctic
landscapes. But accurate quantification and well adapted parameterizations
of turbulent fluxes in polar environments presents fundamental problems in
soil-snow-ice-vegetation-atmosphere interaction studies. One of these
problems is the accurate estimation of the surface or aerodynamic
temperature T(0) required to force most of the bulk aerodynamic formulae
currently used. Results from the Arctic-Turbulence-Experiment (ARCTEX-2006)
performed on Svalbard during the winter/spring transition 2006 helped to
better understand the physical exchange and transport processes of energy.
The existence of an atypical temperature profile close to the surface in the
Arctic spring at Svalbard could be proven to be one of the major issues
hindering estimation of the appropriate surface temperature. Thus, it is
essential to adjust the set-up of measurement systems carefully when
applying flux-gradient methods that are commonly used to force
atmosphere-ocean/land-ice models. The results of a comparison of different
sensible heat-flux parameterizations with direct measurements indicate that
the use of a hydrodynamic three-layer temperature-profile model achieves the
best fit and reproduces the temporal variability of the surface temperature
better than other approaches. |
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