Using observational data from Zoige Station in the source region of the Yellow River, the model CLM3.5 was employed to do a single point simulation. Comparison of the observed and simulated values of soil temperature and moisture verifies the applicability of the model in the seasonal frozen soil area of the source region of the Yellow River. The simulated soil temperature is better during the non-freeze period, though the values are much higher at the deep layer than the observation. But a bias occurs during the freezing period. The simulated temperature is lower and the simulated freezing depth is deeper than the observation. The simulation of soil moisture indicates the start time of freeze and thaw is ahead of time. The thermal conductivity of soil matrix in the model is too large may be the main reason for the deviation. So the sensitive experiment which replaces the original parameterization scheme with the Johansen scheme was done. The new simulated result shows the significant improvement to the original. It matches the observation more closely in the freezing depth and the start time of freeze and thaw. The phenomenon which the simulated temperature is lower than the observation during the freezing period is also improved to some extent.
CHEN Boli
,
LUO Siqiong
,
Lü Shihua
,
ZHANG Yu
. Simulation and Improvement of Soil Temperature and Moisture at Zoige Station in Source Region of the Yellow River during Freezing and Thawing[J]. Plateau Meteorology, 2014
, 33(2)
: 337
-345
.
DOI: 10.7522/j.issn.1000-0534.2013.00085
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