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• W2251379310 abstract "The Tibetan Plateau attracts attention in recent decades due to its influence on the East-Asian Monsoon and regional hydrology. Therefore estimates of the regional energy and water balance have come into the focus, utilising remote sensing and regional model approaches, but such attempts require surface-specific flux data of high quality for validation. Eddy-covariance measurements are qualified for this task, but these are scarce on the Tibetan Plateau, incomplete due to quality filtering and potentially biased due to the well-known closure gap of the observed energy balance as well as small-scale heterogeneity. This thesis is related to the infrastructural EU project CEOP-AEGIS, aiming at a standardised processing of eddy-covariance data – including correction of the energy balance closure and gap-filling – on the Tibetan Plateau. In a pre-analysis step, particular issues about data quality of turbulent fluxes (sensible heat flux and latent heat flux/evapotranspiration) at Tibetan Plateau sites have been addressed. One of them is the degradation of data quality due to the frequent occurrence of near-ground free convective conditions. Another issue arises from coordinate rotation for non-omnidirectional sonic anemometer, which requires a careful handling. In consequence, a sector-wise planar-fit is recommended, disregarding the sector influenced by the anemometer's mounting structure. This can reduce occurrences of invalid momentum flux data, whilst no effect on scalar fluxes can be seen. As a main topic, this thesis investigates the application of process-based modelling to estimate turbulent flux exchange between the surface and the atmosphere for typical surface types on the Tibetan Plateau. Therefore a case study has been carried out at Nam Co, Tibetan Plateau. Turbulent flux measurements over dry and wet grassland as well as over a shallow lake have been conducted during the summer monsoon season of 2009, and modelled with the land surface scheme SEWAB and a hydrodynamic multilayer model for the lake. Adaptations were implemented to the land surface scheme with regard to the special conditions on the Tibetan Plateau, such as extreme diurnal variation of surface temperature and variation in soil moisture, further called TP version. The analysis includes a consequent model comparison with eddy-covariance data, using model parameters derived independently rather than applying optimisation strategies. Specific attention has been devoted to the impact of observed energy balance closure and its correction, establishing a new correction method according to the Buoyancy flux. The land surface model reasonably represented the dry and the wet grassland site by only setting the site-specific model parameters, and the TP version performed overall better than the original version, while laboratory measurements of soil parameters failed to improve model performance in comparison to standard parameter values. Soil temperature and moisture measurements as well as field based knowledge of the soil type have been identified…" @default.
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• W2251379310 date "2013-01-01" @default.
• W2251379310 modified "2023-09-27" @default.
• W2251379310 title "Site-specific modelling of turbulent fluxes on the Tibetan Plateau" @default.
• W2251379310 hasPublicationYear "2013" @default.
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