基于MERRA再分析数据伊犁河流域水储量变化研究

Study on the Change of Water Storage in the Ili River Basin Based on MERRA Reanalysis Data

为了弥补GRACE重力卫星无法在小流域上研究水储量问题,本文利用空间高分辨率的MERRA再分析数据分析1980~2014年长时间序伊犁河流域水储量变化特征。结果表明:在空间上,伊犁河流域水储量大部分地区处于亏损状态,最大亏损量为?40.08 mm。流域内水储量变化与降水变化均呈现下降趋势。在年内,流域内平均水储量的上呈现“U”型分布,10月到次年3月冬半年水储量为盈余状态,12月出现最高值(16.1 mm)。4~9月份夏季为处于亏损状态(?14.68 mm)。1980~2014年伊犁河流域国内区域水储量呈增长趋势,而国外区域呈下降趋势。

To solve the problem of GRACE water storage dataset's coarse spatial resolution in the small wa-tershed, high-resolution reanalysis dataset of MERRA was deployed in this study for long term analysis of water storage in Ili River Basin. It was shown that most of the Ili River Basin's water storage was spatially at loss, and the maximum loss amount had reached to ?40.08 mm. The trend of water storage agreed with total annual precipitation’s, which were in downward trend. In a year, the monthly water storage change curve was in “U” shape. The water storage was surplus in the winter year (the maximum surplus was 16.1 mm) and under deficit in summer year (the maximum loss was ?14.68 mm). In the period of 1980-2014, the Ili River Basin's water storage in domestic part showed a rising trend, while the foreign part was declining at counter.