| TRMM降水数据在中天山区域的精度评估分析 |
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| 引用本文： | 季漩,罗毅.TRMM降水数据在中天山区域的精度评估分析[J].干旱区地理,2013,36(2):253-262. |
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| 作者姓名： | 季漩 罗毅 |
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| 作者单位： | 1. 荒漠与绿洲生态国家重点实验室,中国科学院新疆生态与地理研究所,新疆乌鲁木齐830011;中国科学院大学,北京100101
2. 荒漠与绿洲生态国家重点实验室,中国科学院新疆生态与地理研究所,新疆乌鲁木齐830011;中国科学院生态系统网络观测与模拟重点实验室,中国科学院地理科学与资源研究所,北京 100101 |
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| 基金项目： | 国家自然科学基金重点项目，全球变化研究重大研究计划(973)项目 |
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| 摘 要： | 遥感降水产品能反映降水的时空分布变化，对于资料稀缺的西北干旱区生态水文研究有重大意义。TRMM卫星降水资料在热带湿润地区有大量应用，但要将其用于我国西北干旱半干旱气候地区，还需对该数据产品在质量进行评估。选择干旱区内陆的新疆天山中部为研究区，并以周边15个台站的实测数据为依据对TRMM3B42降水数据质量进行评价。结果表明：（1）TRMM3B42数据对日降水事件的估计准确率较低，但是总体上暖季好于冷季，相对于较大的降水，对发生量小的降水估计更为准确；在暖季高估量小降水，低估量大降水，冷季则相反；（2）月降水情况来看，天山南坡两站与北坡的规律不符；对北坡山区降水估计的精度好于平原区，并且精度与海拔呈抛物线分布，降水越大的区域精度越高；偏差量的年内分布在各海拔区域之内一致性较好，但区域之间规律各有特点；（3）从年降水量来看，TRMM降水整体低于站点观测值，并且差量随着高程具有抛物线分布的特征。总之，该降水产品的质量总体上不高，但是其偏差在时间和空间上具有一定的规律性，该数据在干旱区的应用需要进一步校准处理。
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| 关 键 词： | RMM 干旱区 降水 天山 |
| 收稿时间： | 2012-06-17; |
Quality Assessment of the TRMM Precipitation Data in Mid Tianshan Mountains |
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| JI,LUO Yi.Quality Assessment of the TRMM Precipitation Data in Mid Tianshan Mountains[J].Arid Land Geography,2013,36(2):253-262. |
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| Authors: | JI LUO Yi |
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| Institution: | （1 State Key Laboratory of Oasis Ecology and Desert Environment，Xinjiang Institute of Ecology and Geography，CAS，Urumqi 830011，Xinjiang，China；2 Key Laboratory of Ecosystem Network Observation and Modeling，Institute of Geographic Sciences and Natural Resources Research，CAS，Beijing，China；3 University of Chinese Academy of Science，Beijing 100049，China） |
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| Abstract: | Precipitation has significant implications for the regional hydrologic cycle. Studying the spatial and temporal distribution of precipitation is important to the ecological environment and people's livelihood in northwest arid zone in China. Remote sensing precipitation products have the ability to reflect the spatial and temporal distribution of precipitation, and help with solving the problem of sparse meteorological stations in this region. The TRMM （Tropical Rainfall Measurement Mission） precipitation products as a satellite data are widely used in the humid tropics in recent years, and it is proved that the performance is good. However, the effect of the products in the arid and semi-arid area remains to be unclear. It should do a qualitative assessment before applying the products. This paper chose the mid Tianshan Mountains region as the study area, which locates in the inland arid zone. The quality of TRMM3B42 precipitation products was mainly evaluated for different time scale and different elevation scale based on observed data of 15 stations around the study area. The result showed that: the accuracy of precipitation events estimated by the daily products is low，and the accuracy is better in warm season than that in cold season, also the accuracy is better in small amount than that in large amount; Bias analyses of daily precipitation show that the estimated value tends to be higher than that of observed data on small precipitation events ,and to be lower on large precipitation events in warm season, but it has an opposite situation in cold season that higher on large precipitation and lower on small precipitation. For monthly precipitation assessment, the products perform well （R2>0.85）] at the two stations （Bayinbuluke and Baluntai） on the southern slope of the mid Tianshan Mountains, it is quite different for the stations on the northern slope. On the northern slope, compared to the performance of the low plain, the monthly precipitation estimations is better in the mountain area; both the R2] and RMSE changes with the elevation show a parabolic distribution, and have a positive correlation with annual average precipitation; also the annual distribution of the deviation is different in each elevation ranges, large deviation could be found in the spring and the autumn in low altitude area but in the summer in high altitude. In terms of yearly scale evaluation, it is clear that the TRMM estimated precipitation is lower than that of observed data at all stations, but the estimated value still can reflect the tendency of spatial distribution of precipitation，as the elevation increasing the deviation becomes larger, and gets maximum at the altitudes between 2 000 m and 3 000 m. Overall, the TRMM 3B42 precipitation data have the limitation in quality for arid and semi-arid climate environment, but the deviations have certain regularity. Calibration is indispensable and feasible processing of TRMM in the arid region. |
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| Keywords: | TRMM arid area precipitation Tianshan Mountain |
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