Temporal and spatial features of the soil moisture in boreal spring in eastern China |
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Authors: | ZhiYan Zuo RenHe Zhang |
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Institution: | (1) State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing, 100081, China |
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Abstract: | Soil moisture data of 45 years from European Center for Medium-Range Weather Forecasts (ECMWF) Re-Analysis (ERA-40) and the
in situ observational data are used to study the temporal and spatial characteristics of the soil moisture in boreal spring in the
area to the east of 100°E in China. Results show that ERA-40 soil moisture well reproduces the temporal and spatial features
of observations. ERA-40 data capture the spatial pattern that the soils in Northeast China and Southwest China are wetter
than those in Inner Mongolia and North China and represent the inter-annual variability in observations. The dry trends of
spring soil moisture are evident over the whole eastern China. It is especially prominent for the dry trend in southwest China
where the spring soil from surface to deep-layer show drying and the trend became significant after the 1980s. The dry trend
in Northeast China is weak after early 1970s in near-surface layer but aggravates after latel 1970s in deep layers. In the
mid-latitude zone, the inter-annual variation of spring soil is robust and shows no dry trend except in deep-layer after 1988.
Supported by the National Basic Research Program of China (Grant No. 2004CB418302) and National Natural Science Foundation
of China (Grant No. 40225012) |
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Keywords: | soil moisture 100°E east of China spring temporal and spatial variation |
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