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| Titel |
Effects of interbasin water transfer on regional climate: A case study of the Middle Route of South-to-North Water Transfer Project in China |
| VerfasserIn |
Z. H. Xie, F. Chen |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250025861
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| Zusammenfassung |
| Large-scale interbasin water transfer, which changes basins by creating new hydrological
cycles, has the potential to affect local and regional climate. In this paper, the effects of
interbasin water transfer on regional climate are studied based on numerical simulations with
the regional climate model RegCM3. The Middle Route of South-to-North Water Transfer
Project (MRSNWTP) in China is chosen as a case study to investigate the climatic responses
under the three water transfer schemes with the intensities of 74.99, 85.31, and 118.16
billion m3/year (named Scheme 1, Scheme 2, and Scheme 3, respectively) based
on the simplifications of the project programming. Four ten-year simulations are
performed, which are the control run (MCTL) without water transfer, and three
water transfer runs MWT1, MWT2, and MWT3 related to the Schemes 1, 2, and 3,
respectively. For the three Schemes compared to the case without water transfer, we find
increases of 1.47, 1.71, and 2.32 mm in top-layer soil moisture, and increases of 5.57,
6.40, and 8.99W/m2 in latent heat flux, respectively, as a directly influence for
injecting water into the intake area. The increases in latent heat fluxes and those in
evaporation are accompanied with the decreases of 4.30, 5.05, and 7.12W/m2 in sensible
heat flux, the decreases of 0.11, 0.14, and 0.18- in mean air temperature, and the
increases of 8.54, 7.89, and 18.2 mm in precipitation in the intake grid cells and even
their adjacent ones. The intensity of climatic influences positively relates to the
transferred water quantity, has strong seasonal variability, and takes a greater effect in
spring and autumn than that in summer and winter. Further analysis shows that the
transferred water can reduce both the seasonal temperature range and the diurnal
temperature range; the temperature decreasing can diffuse over almost the whole
Huabei Plain below 700 hPa, and hence weaken the wind velocity of the easterly
breeze. It follows from the analyses on vertical profile of water vapor content and the
atmospheric moisture budgets that the transferred water can affect the local and
regional climate by changing the local and regional water vapour transports, and
especially influence the precipitation mainly by changing the convective precipitation
over the intake area and the large-scale precipitation over the other adjacent region. |
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