Abstract
In this paper, we use GLDAS (Global Land Data Assimilation System) to analyze the effects of air temperature and precipitation on the characteristics of soil moisture in the eastern region of China from 1961 to 2011. We find that the temperature and precipitation in different seasons have different degrees of influence on the characteristics of soil moisture in each layer. The results show that over the last 50 years, the soil moisture in eastern China has a tendency to dry out, especially between the late 1970s to the early 1980s. The change of soil moisture with the depth of soil layer has similar inter-annual and seasonal patterns. Soil moisture in different depths (0–200 cm) positively correlates with the air temperatures of spring, summer and autumn, but negatively correlates with the air temperature in winter at 0–10 cm, 40–100 cm and 100–200 cm. Similarly, soil moisture is positively related to the precipitation in spring, summer and autumn, and the opposite is true in winter. The results also show that precipitation has a significant effect on the shallow soil moisture (0–10 cm), while air temperature most affects the deep soil moisture (100–200 cm).
Highlights
Soil moisture plays a very key role in the process of climate evolution
From the correlation coefficient correlation coefficient of precipitation and soil moisture, we find that precipitation and soil moistureof and soil moisture, we correlation find that precipitation and soil moisture in different have inprecipitation different depths have a positive in spring, summer and autumn, but it isdepths negative ina positiveCorrelation correlationcoefficients in spring, summer and and autumn, butfall it isroughly negative winter
The Quantitative Relationship of Precipitation and Temperature to Soil Moisture different in spring and summer, as the correlation coefficient of spring and summer soil moisture is study we found that temperature andcorrelated precipitation play in the process close In to the
Summary
Soil moisture plays a very key role in the process of climate evolution. It carries the responsibilities of energy and water exchange between land and atmosphere, it takes part in the land–atmosphere interaction. Soil moisture and climate changes are connected. Soil heat capacity, and the transfer of heat into the atmosphere are affected by changes in levels of soil moisture, which indirectly affects climate change. Climate change will have an impact on the soil by altering its moisture content. The heat capacity of soil is small, surface albedo is large; yet the transfer of heat into the atmosphere is not obvious for small soil moisture. Because of deep soil’s vertical direction, precipitation’s effects on its soil moisture lags by about 1 to 2 months
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