2001-2010年石羊河流域上游TRMM降水资料的降尺度研究
Spatial downscaling of TRMM precipitation data based on DEM in the upstream of Shiyang River Basin during 2001-2010
查看参考文献23篇
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文摘
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在地形比较复杂的石羊河流域上游,基于2001-2010年TRMM3B43降水数据和1km空间分辨率DEM数据,采用回归方程+残差法的插值方法,对石羊河流域上游10年平均TRMM3B43和2001、2007年两个典型干、湿年份的TRMM3B43数据分别进行降尺度操作,将空间分辨率由原来的0.25°×0.25°提高为1km×1km。利用研究区34个雨量站的观测数据作为“真实值”,对2001-2010年的TRMM3B43和降尺度结果进行精度检验,结果表明:TRMM3B43降水数据整体上具有一定的可信度,但比地面站点观测的降水量偏小;TRMM3B43经过降尺度之后,数据在空间分辨率和精度方面都有一定程度的提高,其中10年平均TRMM3B43降尺度结果的精度要高于2001年(干旱),而2001年的降尺度结果精度又高于2007年(湿润);就单个雨量站而言,位于西部高海拔区域的站点的降尺度结果精度较高,而位于东部低海拔区域的站点的降尺度结果精度较低。 |
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其他语种文摘
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Rainfall data are often obtained by ground-based observatories. However, traditional measurements based on raingauge stations can't reflect the spatial variation of precipitation effectively, especially in the Shiyang River Basin, which is a typical area with complicated terrain and climatic characteristics. There is great potential in making hydrological predictions by using satellite-based rainfall estimation. As a precipitation radar satellite, TRMM has been collecting plenty of fine temporal-spatial precipitation data. However, when applied to local basins and regions, the spatial resolution of TRMM products is too coarse, so it is necessary to develop a method to improve the spatial resolution of TRMM before using it. In this paper, a statistical downscaling algorithm based on the relationship between Tropical Rainfall Measuring Mission (TRMM) 3B43 dataset and the DEM(GTOPO30)from USGS is presented. A multiple linear regression model was established under the scale of 1 km. By applying a downscaling methodology based on 1 km resolution, the TRMM3B43 0.25°×0.25° precipitations were downscaled to 1 km×1 km pixel precipitation for each year from 2001 to 2010. The downscaled precipitation estimates were subsequently validated by using the observations obtained from 34 raingauge stations for the duration of 10 years in the Shiyang River Basin. These results showed that: the downscaling procedure resulted in significant improvement in spatial resolution and data quality for annual precipitation during 2001-2010, as well as for a typical dry year (2001) and wet year (2007), and captured the trends of precipitation in spatial distribution and inter-annual variability of annual precipitation with the coefficient of determination R2 ranging from 0.45 to 0.93 at 34 different raingauge stations. |
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来源
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地理科学进展
,2013,32(9):1423-1432 【核心库】
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关键词
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TRMM
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降尺度
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降水
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石羊河流域上游
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地址
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兰州大学资源环境学院, 兰州, 730000
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1007-6301 |
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学科
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自然地理学 |
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基金
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国家自然科学基金
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文献收藏号
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CSCD:4951756
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