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| Titel |
A comparison of eddy-covariance and large aperture scintillometer measurements with respect to the energy balance closure problem |
| VerfasserIn |
S. M. Liu, Z. W. Xu, W. Z. Wang, Z. Z. Jia, M. J. Zhu, J. Bai, J. M. Wang |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 15, no. 4 ; Nr. 15, no. 4 (2011-04-26), S.1291-1306 |
| Datensatznummer |
250012753
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| Publikation (Nr.) |
 copernicus.org/hess-15-1291-2011.pdf |
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| Zusammenfassung |
| We analyzed the seasonal variations of energy balance components over three
different surfaces: irrigated cropland (Yingke, YK), alpine meadow (A'rou,
AR), and spruce forest (Guantan, GT). The energy balance components were
measured using eddy covariance (EC) systems and a large aperture
scintillometer (LAS) in the Heihe River Basin, China, in 2008 and 2009. We
also determined the source areas of the EC and LAS measurements with a
footprint model for each site and discussed the differences between the
sensible heat fluxes measured with EC and LAS at AR. The results show that
the main EC source areas were within a radius of 250 m at all of the sites.
The main source area for the LAS (with a path length of 2390 m) stretched
along a path line approximately 2000 m long and 700 m wide. The surface
characteristics in the source areas changed with the season at each site,
and there were characteristic seasonal variations in the energy balance
components at all of the sites. The sensible heat flux was the main term of
the energy budget during the dormant season. During the growing season,
however, the latent heat flux dominated the energy budget, and an obvious
"oasis effect" was observed at YK. The sensible heat fluxes measured by
LAS at AR were larger than those measured by EC at the same site. This
difference seems to be caused by the so-called energy imbalance phenomenon,
the heterogeneity of the underlying surfaces, and the difference between the
source areas of the LAS and EC measurements. |
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