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| Titel |
Evaluation of global continental hydrology as simulated by the Land-surface Processes and eXchanges Dynamic Global Vegetation Model |
| VerfasserIn |
S. J. Murray, P. N. Foster, I. C. Prentice |
| 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. 1 ; Nr. 15, no. 1 (2011-01-13), S.91-105 |
| Datensatznummer |
250012588
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| Publikation (Nr.) |
 copernicus.org/hess-15-91-2011.pdf |
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| Zusammenfassung |
| Global freshwater resources are sensitive to changes in climate, land cover
and population density and distribution. The Land-surface Processes and
eXchanges Dynamic Global Vegetation Model is a recent development of the
Lund-Potsdam-Jena model with improved representation of fire-vegetation
interactions. It allows simultaneous consideration of the effects of changes
in climate, CO2 concentration, natural vegetation and fire regime
shifts on the continental hydrological cycle. Here the model is assessed for
its ability to simulate large-scale spatial and temporal runoff patterns, in
order to test its suitability for modelling future global water resources.
Comparisons are made against observations of streamflow and a composite
dataset of modelled and observed runoff (1986–1995) and are also evaluated
against soil moisture data and the Palmer Drought Severity Index.
The model captures the main features of the geographical distribution of
global runoff, but tends to overestimate runoff in much of the Northern Hemisphere (where this can be somewhat accounted for by freshwater
consumption and the unrealistic accumulation of the simulated winter
snowpack in permafrost regions) and the southern tropics. Interannual
variability is represented reasonably well at the large catchment scale, as
are seasonal flow timings and monthly high and low flow events. Further
improvements to the simulation of intra-annual runoff might be achieved via
the addition of river flow routing. Overestimates of runoff in some basins
could likely be corrected by the inclusion of transmission losses and
direct-channel evaporation. |
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