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| Titel |
Hydrological system analysis and modelling of the Nam Co basin in Tibet |
| VerfasserIn |
P. Krause, S. Biskop, J. Helmschrot, W.-A. Flügel, S. Kang, T. Gao |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrologic Modelling for the Assessment of Ecosystem Services and Landscape Functions ; Nr. 27 (2010-08-25), S.29-36 |
| Datensatznummer |
250016336
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| Publikation (Nr.) |
 copernicus.org/adgeo-27-29-2010.pdf |
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| Zusammenfassung |
The Tibetan Plateau and the adjacent high mountain regions of the Himalayas
play an important role in the global climate dynamic through its impact on
the Asian monsoon system, which in turn is impacting the water resources of
this extremely vulnerable region. To provide further knowledge about the
changing impact of rainfall patterns, spatial and temporal variability of
snow cover contribution, amount of snow and ice melt runoff,
evapotranspiration as well as dynamics of wetlands and permafrost water
balance studies are required. This is of particular importance in terms of
global climate change because of a severe gap in the knowledge of the short,
mid and long term implications on the hydrological system.
This study concentrates on the macroscale catchment of the lake Nam
Co, located at 4718 m a.s.l. at the foot of the Nyainqentanglha Mountains
in central Tibet (30° N, 90° E). The water balance of the
Nam Co basin is dominated by semi-arid climate, snow and ice melt
runoff and high evaporation rates due to the high radiation input and the low
air humidity. The observed temperature rise, glacier retreat, permafrost
decay and lake level increase indicate significant system changes and the
high sensitivity of the Tibetan Plateau on global warming. The development of
a suitable water balance model and its preliminary application was the main
objective of this study. The development was done with the Jena Adaptable
Modelling System JAMS along with existing scientific process components of
the J2000 module library which were partly further developed to reflect the
specific conditions of the high elevation Nam Co basin.
The preliminary modelling exercise based on gridded data from a downscaled
ECHAM5 data set provided reasonable estimates about the important
hydrological water balance components of the Nam Co basin. With the
modelling results the observed lake level rise could be reproduced and it
could be shown that the runoff from the glaciered areas seems to be the most
important component to explain the increasing amount of lake water. |
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