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High-resolution modelling of interactions between soil moisture and convective development in a mountain enclosed Tibetan Basin

DOI zum Zitieren dieses Dokuments: https://doi.org/10.5194/hess-19-4023-2015

Title data

Gerken, Tobias ; Babel, Wolfgang ; Herzog, Michael ; Sun, Fanglin ; Ma, Yaoming ; Foken, Thomas ; Graf, Hans-F.:
High-resolution modelling of interactions between soil moisture and convective development in a mountain enclosed Tibetan Basin.
In: Hydrology and Earth System Sciences. Vol. 19 (2015) Issue 9 . - pp. 4023-4040.
ISSN 1607-7938
DOI: https://doi.org/10.5194/hess-19-4023-2015

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Abstract

The Tibetan Plateau plays a significant role in at-mospheric circulation and the Asian monsoon system. Tur-bulent surface fluxes and the evolution of boundary-layerclouds to deep and moist convection provide a feedback sys-tem that modifies the plateau’s surface energy balance onscales that are currently unresolved in mesoscale models.This work analyses the land surface’s role and specificallythe influence of soil moisture on the triggering of convectionat a cross section of the Nam Co Lake basin, 150 km northof Lhasa using a cloud-resolving atmospheric model with afully coupled surface. The modelled turbulent fluxes and de-velopment of convection compare reasonably well with theobserved weather. The simulations span Bowen ratios of 0.5to 2.5. It is found that convective development is the strongestat intermediate soil moisture. Dry cases with soils close to thepermanent wilting point are moisture limited in convectivedevelopment, while convection in wet soil moisture casesis limited by cloud cover reducing incoming solar radiationand sensible heat fluxes, which has a strong impact on thesurface energy balance. This study also shows that local de-velopment of convection is an important mechanism for theupward transport of water vapour, which originates from thelake basin that can then be transported to dryer regions of theplateau. Both processes demonstrate the importance of soilmoisture and surface–atmosphere interactions on the energyand hydrological cycles of the Tibetan Plateau.

Further data

Item Type: Article in a journal
Additional notes (visible to public): BAYCEER131306
Keywords: Tibet
DDC Subjects: 500 Science
Institutions of the University: Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professorship Micrometeorology
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Former Professors > Professorship Micrometeorology - Univ.-Prof. Dr. Thomas Foken
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Former Professors
Language: English
Originates at UBT: Yes
Date Deposited: 22 Jul 2016 06:08
Last Modified: 08 Feb 2017 10:44
URI: https://epub.uni-bayreuth.de/id/eprint/3119

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