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| Titel |
Evaluating the performance of SURFEXv5 as a new land surface scheme for the ALADINcy36 and ALARO-0 models |
| VerfasserIn |
R. Hamdi, D. Degrauwe, A. Duerinckx, J. Cedilnik, V. Costa, T. Dalkilic, K. Essaouini, M. Jerczynki, F. Kocaman, L. Kullmann, J.-F. Mahfouf, F. Meier, M. Sassi, S. Schneider, F. Váňa, P. Termonia |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 7, no. 1 ; Nr. 7, no. 1 (2014-01-07), S.23-39 |
| Datensatznummer |
250115530
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| Publikation (Nr.) |
 copernicus.org/gmd-7-23-2014.pdf |
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| Zusammenfassung |
| The newly developed land surface scheme SURFEX (SURFace EXternalisée) is
implemented into a limited-area numerical weather prediction model running
operationally in a number of countries of the ALADIN and HIRLAM consortia.
The primary question addressed is the ability of SURFEX to be used as a new
land surface scheme and thus assessing its potential use in an operational
configuration instead of the original ISBA (Interactions between Soil,
Biosphere, and Atmosphere) scheme. The results show that the introduction of
SURFEX either shows improvement for or has a neutral impact on the 2 m temperature,
2 m relative humidity and 10 m wind. However, it seems that SURFEX has a
tendency to produce higher maximum temperatures at high-elevation stations
during winter daytime, which degrades the 2 m temperature scores. In
addition, surface radiative and energy fluxes improve compared to
observations from the Cabauw tower. The results also show that promising
improvements with a demonstrated positive impact on the forecast performance
are achieved by introducing the town energy balance (TEB) scheme. It was
found that the use of SURFEX has a neutral impact on the precipitation
scores. However, the implementation of TEB within SURFEX for a high-resolution run tends to cause rainfall to be locally concentrated, and the
total accumulated precipitation obviously decreases during the summer. One of
the novel features developed in SURFEX is the availability of a more advanced
surface data assimilation using the extended Kalman filter. The results over
Belgium show that the forecast scores are similar between the extended Kalman
filter and the classical optimal interpolation scheme. Finally, concerning
the vertical scores, the introduction of SURFEX either shows improvement for or
has a neutral impact in the free atmosphere. |
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