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| Titel |
Contrasting roles of interception and transpiration in the hydrological cycle – Part 1: Temporal characteristics over land |
| VerfasserIn |
L. Wang-Erlandsson, R. J. Ent, L. J. Gordon, H. H. G. Savenije |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
2190-4979
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| Digitales Dokument |
URL |
| Erschienen |
In: Earth System Dynamics ; 5, no. 2 ; Nr. 5, no. 2 (2014-12-05), S.441-469 |
| Datensatznummer |
250115376
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| Publikation (Nr.) |
 copernicus.org/esd-5-441-2014.pdf |
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| Zusammenfassung |
| Moisture recycling, the contribution of terrestrial evaporation to
precipitation, has important implications for both water and land management.
Although terrestrial evaporation consists of different fluxes (i.e.
transpiration, vegetation interception, floor interception, soil moisture
evaporation, and open-water evaporation), moisture recycling (terrestrial
evaporation–precipitation feedback) studies have up to now only analysed
their combined total. This paper constitutes the first of two companion
papers that investigate the characteristics and roles of different
evaporation fluxes for land–atmosphere interactions. Here, we investigate
the temporal characteristics of partitioned evaporation on land and present
STEAM (Simple Terrestrial Evaporation to Atmosphere Model) – a hydrological
land-surface model developed to provide inputs to moisture tracking. STEAM
estimates a mean global terrestrial evaporation of
73 900 km3 year-1, of which 59% is transpiration. Despite
a relatively simple model structure, validation shows that STEAM produces
realistic evaporative partitioning and hydrological fluxes that compare well
with other global estimates over different locations, seasons, and land-use
types. Using STEAM output, we show that the terrestrial residence timescale
of transpiration (days to months) has larger inter-seasonal variation and is
substantially longer than that of interception (hours). Most transpiration
occurs several hours or days after a rain event, whereas interception is
immediate. In agreement with previous research, our simulations suggest that
the vegetation's ability to transpire by retaining and accessing soil
moisture at greater depth is critical for sustained evaporation during the
dry season. We conclude that the differences in temporal characteristics
between evaporation fluxes are substantial and reasonably can cause
differences in moisture recycling, which is investigated more in the
companion paper (van der Ent et al., 2014, hereafter Part 2). |
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