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| Titel |
Estimates of the climatological land surface energy and water balance derived from maximum convective power |
| VerfasserIn |
A. Kleidon, M. Renner, P. Porada |
| 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 ; 18, no. 6 ; Nr. 18, no. 6 (2014-06-17), S.2201-2218 |
| Datensatznummer |
250120385
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| Publikation (Nr.) |
 copernicus.org/hess-18-2201-2014.pdf |
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| Zusammenfassung |
| The land surface energy and water balances are tightly coupled by the
partitioning of absorbed solar radiation into terrestrial radiation and the
turbulent fluxes of sensible and latent heat, as well as the partitioning of
precipitation into evaporation and runoff. Evaporation forms the critical
link between these two balances. Its rate is strongly affected by turbulent
exchange as it provides the means to efficiently exchange moisture between
the heated, moist surface and the cooled, dry atmosphere. Here, we use the
constraint that this mass exchange operates at the thermodynamic limit of
maximum power to derive analytical expressions for the partitioning of the
surface energy and water balances on land. We use satellite-derived forcing
of absorbed solar radiation, surface temperature and precipitation to derive
simple spatial estimates for the annual mean fluxes of sensible and latent
heat and evaluate these estimates with the ERA-Interim reanalysis data set and
observations of the discharge of large river basins. Given the extremely
simple approach, we find that our estimates explain the climatic mean
variations in net radiation, evaporation, and river discharge reasonably
well. We conclude that our analytical, minimum approach provides adequate
first order estimates of the surface energy and water balance on land and
that the thermodynamic limit of maximum power provides a useful closure
assumption to constrain the energy partitioning at the land surface. |
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