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| Titel |
Responses of snowmelt runoff to climatic change in an inland river basin, Northwestern China, over the past 50 years |
| VerfasserIn |
J. Wang, H. Li, X. Hao |
| 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 ; 14, no. 10 ; Nr. 14, no. 10 (2010-10-19), S.1979-1987 |
| Datensatznummer |
250012448
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| Publikation (Nr.) |
 copernicus.org/hess-14-1979-2010.pdf |
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| Zusammenfassung |
| The spatial and temporal variations of snowcover distribution, and snowmelt
runoff are considered as sensitive indicators for climatic change. The
purpose of this paper is to analyze and forecast the responses of snowmelt
runoff to climate change in an inland river basin. The upper basin of Heihe
River in Northwestern China was chose as the study area, and the observation
data from the meteorological and hydrological stations were utilized to
analyze the status and regularity of the climatic change over the past 50
years. Snow cover area was obtained by an optimized technology using
Moderate Resolution Imaging Spectroradiometer data with Normalized
Difference Snow Index adjustment and topographic correction. A concept of
potential snowmelt was suggested to illustrate the response of spatial
snowmelt to climate change. The results show that the annual SCA proportion
and the potential snowmelt keep an increasing trend since 2000. There is a
negative relationship between annual air temperature and SCA proportion from
2000 to 2008. Snowmelt Runoff Model was chose to simulate snowmelt runoff
and scenario forecast the change trend of snowmelt runoff in this region.
The results show that climatic warming was apparent in the upper basin of
Heihe River over the past 50 a. Annual average air temperature of three
different weather stations located in the basin has increased 2.1 °C,
2.6 °C and 2.9 °C respectively from 1956 to present. The
snowmelt runoff has increased obviously from 1970 to present. With different
warming climate scenarios, the results by using SRM simulating showed that
the first occurred time of snowmelt runoff shift ahead and discharge become
larger as responses of snowmelt runoff to air temperature increasing, and
the influence of temperature rising on average discharge of the whole snow
season is not obvious. |
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