 |
| Titel |
Reconstructing 20th century global hydrography: a contribution to the Global Terrestrial Network- Hydrology (GTN-H) |
| VerfasserIn |
D. Wisser, B. M. Fekete, C. J. Vörösmarty, A. H. Schumann |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1027-5606
|
| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 14, no. 1 ; Nr. 14, no. 1 (2010-01-06), S.1-24 |
| Datensatznummer |
250012143
|
| Publikation (Nr.) |
 copernicus.org/hess-14-1-2010.pdf |
|
|
|
|
|
| Zusammenfassung |
This paper presents a new reconstruction of the 20th century global
hydrography using fully coupled water balance and transport model in a
flexible modeling framework. The modeling framework allows a high level of
configurability both in terms of input forcings and model structure. Spatial
and temporal trends in hydrological cycle components are assessed under
"pre-industrial" conditions (without modern-day human activities) and
contemporary conditions (incorporating the effects of irrigation and
reservoir operations). The two sets of simulations allow the isolation of
the trends arising from variations in the climate input driver alone and
from human interventions. The sensitivity of the results to variations in
input data was tested by using three global gridded datasets of
precipitation.
Our findings confirm that the expansion of irrigation and the construction of reservoirs
has significantly and gradually impacted hydrological components in
individual river basins. Variations in the volume of water entering the
oceans annually, however, are governed primarily by variations in the climate
signal alone with human activities playing a minor role. Globally, we do not
find a significant trend in the terrestrial discharge over the last century.
The largest impact of human intervention on the hydrological cycle arises
from the operation of reservoirs that drastically changes the seasonal
pattern of horizontal water transport in the river system and thereby
directly and indirectly affects a number of processes such as ability to
decompose organic matter or the cycling of nutrients in the river system. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|