Improving the CoLM in Taklimakan Desert hinterland with accurate key parameters and an appropriate parameterization scheme |
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Authors: | LIU Yongqiang HE Qing ZHANG Hongsheng Ali MAMTIMIN |
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Institution: | Institute of Desert Meteorology, China Meteorological Administration, Urumqi 830002,
College of Resources & Environmental Science, Xinjiang University, Urumqi 830046,
Key Laboratory of Oasis Ecology (Xinjiang University) Ministry of Education, Urumqi 830046;Institute of Desert Meteorology, China Meteorological Administration, Urumqi 830002, Desert Atmosphere and Environment Observation Experiment of Taklimakan Station, Tazhong 841000;Department of Atmospheric Sciences, Peking University, Beijing 100871;Institute of Desert Meteorology, China Meteorological Administration, Urumqi 830002, Desert Atmosphere and Environment Observation Experiment of Taklimakan Station, Tazhong 841000 |
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Abstract: | Improving and validating land surface models based on integrated
observations in deserts is one of the challenges in land modeling.
Particularly, key parameters and parameterization schemes in desert regions
need to be evaluated \textit{in-situ} to improve the models. In this study, we calibrated
the land-surface key parameters and evaluated several formulations or
schemes for thermal roughness length (z0h) in the common land model
(CoLM). Our parameter calibration and scheme evaluation were based on the
observed data during a torrid summer (29 July to 11 September 2009) over the
Taklimakan Desert hinterland. First, the importance of the key parameters in
the experiment was evaluated based on their physics principles and the
significance of these key parameters were further validated using
sensitivity test. Second, difference schemes (or physics-based formulas) of
z0h were adopted to simulate the variations of energy-related variables
(e.g., sensible heat flux and surface skin temperature) and the simulated
variations were then compared with the observed data. Third, the z0h
scheme that performed best (i.e., Y07) was then selected to replace the
defaulted one (i.e., Z98); the revised scheme and the superiority of Y07
over Z98 was further demonstrated by comparing the simulated results with
the observed data. Admittedly, the revised model did a relatively poor job
of simulating the diurnal variations of surface soil heat flux, and
nighttime soil temperature was also underestimated, calling for further
improvement of the model for desert regions. |
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Keywords: | common land model (CoLM) parameter parameterization scheme Taklimakan Desert |
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