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| Spatial Differentiation of Spring Precipitation in the Heihe River Basin and Its Correlation with the River Flow |
| Liu Honglan1,2, Zhang Qiang1, Guo Junqin3, Wang Sheng4, Zhang Haowen2 |
1. Key Laboratory of Arid Climatic Change and Disaster Reduction of Gansu Province/Key Laboratory of Arid Climate Change and Disaster Reduction of CMA, Institute of Arid Meteorology, China Meteorological Administration, Lanzhou 730020, China;
2. Zhangye Meteorological Bureau, Zhangye 734000, Gansu, China;
3. Northwest Regional Climate Centre, Lanzhou 730020, China;
4. Subei Meteorological Bureau, Subei 736300, Gansu, China |
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Abstract Based on precipitation data of 13 meteorological stations in the Heihe River Basin from March to May through 2012 and flow data from Yingluo Gorge hydrometric station, we analyzed the basic climate characteristics of spring precipitation in the Heihe River Basin. EOF, REOF, Morlet wavelet analysis and other methods were used to research the spatial and temporal characteristics of spring precipitation in the basin. Whether with abrupt change in the spring precipitation sequence was tested by Mann-Kendall way. The results showed that the spatial distribution of spring precipitation in the basin was extremely uneven, the rainy area was located in the south, and the less rain area was located in the north. The spring precipitation in the basin was consistent in the entire region in the first spatial scale, and there were two natural climate zones in the second spatial scale and three natural climate zones in the third spatial scale. From the view of inter-decadal variation, precipitation in 2010s was the most for nearly half a century, and that in 1970s was the least. The inter-annual variability of spring precipitation was significant. The most yearly precipitation was 6 times more than the least. There were obvious abrupt change in the spring precipitation in the basin from 1961 to 2012. An abrupt increase occurred in 2001. The remarkable cycles were the short period of four-year, long period of 14-and 22-year. There was positive correlation between monthly precipitation in the basin and the river flow in spring, especially the contemporaneous correlation in May, and one month lag correlation in each month were significant. There was also positive correlation between spring temperature and river flow, especially the contemporaneous correlation in each month, and one month lag correlation in March were significant. Heihe flow increase depends on precipitation increase and obvious climate warming.
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Received: 20 November 2013
Published: 20 November 2014
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2014, Vol. 34 
