Abstract
Abstract. Soil moisture plays a significant role in agricultural and ecosystem development. However, in the real world soil moisture data are very limited due to many factors. VIC-3L model, as a semi-distribution hydrological model, can potentially provide valuable information regarding soil moisture. In this study, daily soil moisture contents in the surface soil layer (0–10 cm) of 1500 grids at 0.25 × 0.25 degree were simulated by the VIC-3L model. The Mann-Kendall trend test and Morlet wavelet analysis methods were used for the analysis of annual and monthly average surface soil moisture series. Results showed that the trend of surface soil moisture was not obvious on the basin scale, but it varied with spatial and temporal conditions. Different fluctuation amplitudes and periods of surface soil moisture were also discovered on the Yellow River basin during 1961 to 2012.
Highlights
Soil moisture plays a significant role in climatic circulation and hydrological cycle as it governs the mass and energy balance between the land surface and atmosphere
The results show a good correspondence between the two different approaches of soil moisture in the top layer (0–10 cm), but the soil moisture data are no good in the other two layers
Drier surface soil moisture conditions occurred in the Wudinghe River basin
Summary
Soil moisture plays a significant role in climatic circulation and hydrological cycle as it governs the mass and energy balance between the land surface and atmosphere. It is a key variable in hydrological processes, effecting evaporation, transpiration, runoff and precipitation directly or indirectly, and has an impact on plant growth and carbon fluxes (Dirmeyer et al, 1999; Entekhabi et al, 1999). Taking the variation of soil moisture into account will benefit the water management and ecosystem construction of the Yellow River basin. The Mann-Kendall trend test and Morlet wavelet analysis were chosen to do research on the varying trends and oscillation features of soil moisture in the Yellow River basin
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