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| Titel |
Scale-dependency of surface fluxes in an atmospheric mesoscale model: effect of spatial heterogeneity in atmospheric conditions |
| VerfasserIn |
Jinkyu Hong, Joon Kim |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 15, no. 6 ; Nr. 15, no. 6 (2008-12-09), S.965-975 |
| Datensatznummer |
250012812
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| Publikation (Nr.) |
 copernicus.org/npg-15-965-2008.pdf |
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| Zusammenfassung |
| We examined the nonlinear effect of spatial heterogeneity in atmospheric
conditions on the simulation of surface fluxes in the mesoscale model, MM5 by
testing their scale-invariance from a tower footprint to regional scales. The
test domain was a homogeneous shortgrass prairie in the central part of the
Tibetan Plateau with an eddy-covariance flux tower at the center. We found
that the spatial variability resulting from changing distribution of clouds
and precipitation in the model domain affected radiative forcing at the
ground surface, thereby altering the partitioning of surface fluxes.
Consequently, due to increasing spatial variability in atmospheric
conditions, the results of MM5 did not produce convergent estimates of
surface fluxes with increasing grid sizes. Our finding demonstrates that an
atmospheric model can underestimate surface fluxes in regional scale not
necessarily due to intrinsic model inaccuracy (e.g., inaccurate
parameterization) but due to scale-dependent nonlinear effect of spatial
variability in atmospheric conditions. |
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