Spatial-temporal variation characteristics of China terrestrial water storage in the last ten years
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Abstract:
Water storage change trend, annual change characteristics, intra-year distribution characteristics and spatial-temporal variation characteristics of China and the ten main basins in the last ten years were analyzed using the GRACE (Gravity Recovery and Climate Experiment) data. The relationship between total water storage and precipitation was analyzed by combining the TRMM (Tropical Rainfall Measuring Mission) precipitation data. The results were as follows: In the last ten years, China water storage trend showed some different characteristics. Most of China southwest part, North China Plain and the middle and lower reaches of Yellow River, the Junggar Basin of northwest China all showed a decrease in water storage. Meanwhile, southeast of China, most part of Yangtze River Basin, the origin area of Yellow and Yangtze River and Tarim Basin showed an increase. The annual change range of China water storage was very narrow. The annual change ranges of Huaihe, Haihe, Pearl, Songhuajiang river basins were wide and that of Northwest river basin was the narrowest. The water storage annual change in most of river basins had a significant positive correlation with the precipitation change except Yellow River Basin, Haihe Basin and northwest river basins. The correlation coefficients of southeast river basins, Pearl Basin and Yangtze River Basin were more than 0.7. In intra-annual distribution, China water storage was lack in winter and spring, and adequate in summer and autumn. Southwest river basins and Yangtze River Basin showed a severe deficiency in March and April, and showed more surplus from July to September. North China Plain showed a deficiency from May to July and showed a surplus in other months. Yellow River Basin, Yangtze River Basin, southeast river basins, southwest river basins and Pearl Basin showed a good consistence in intra-annual water storage and precipitation. Northwest river basins showed a good consistence except in the period of February to April. The other basins showed a bad consistence.
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