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| Titel |
High-resolution modelling of interactions between soil moisture and convective development in a mountain enclosed Tibetan Basin |
| VerfasserIn |
T. Gerken, W. Babel, M. Herzog, K. Fuchs, F. Sun, Y. Ma, T. Foken, H.-F. Graf |
| 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 ; 19, no. 9 ; Nr. 19, no. 9 (2015-09-29), S.4023-4040 |
| Datensatznummer |
250120817
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| Publikation (Nr.) |
 copernicus.org/hess-19-4023-2015.pdf |
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| Zusammenfassung |
| The Tibetan Plateau plays a significant role in atmospheric circulation
and the Asian monsoon system. Turbulent surface fluxes and the evolution of
boundary-layer clouds to deep and moist convection provide a feedback system
that modifies the plateau's surface energy balance on scales that are
currently unresolved in mesoscale models. This work analyses the land
surface's role and specifically the influence of soil moisture on the
triggering of convection at a cross section of the Nam Co Lake basin, 150 km
north of Lhasa using a cloud-resolving atmospheric model with a fully coupled
surface. The modelled turbulent fluxes and development of convection compare
reasonably well with the observed weather. The simulations span Bowen ratios
of 0.5 to 2.5. It is found that convective development is the strongest at
intermediate soil moisture. Dry cases with soils close to the permanent
wilting point are moisture limited in convective development, while
convection in wet soil moisture cases is limited by cloud cover reducing
incoming solar radiation and sensible heat fluxes, which has a strong impact
on the surface energy balance. This study also shows that local development
of convection is an important mechanism for the upward transport of water
vapour, which originates from the lake basin that can then be transported to
dryer regions of the plateau. Both processes demonstrate the importance of
soil moisture and surface–atmosphere interactions on the energy and
hydrological cycles of the Tibetan Plateau. |
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