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| 广西TRMM降雨产品多时间尺度精度评估 |
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杨星星1, 杨云川1,2,3, 邓思敏1, 廖丽萍1,2,3, 田忆1, 莫崇勋1,2,3, 陈立华1,2,3
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1. 广西大学土木建筑工程学院，广西 南宁 530004;2. 工程防灾与结构安全教育部重点实验室，广西 南宁 530004;3. 广西防灾减灾与工程安全重点实验室，广西 南宁 530004
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| 摘要: |
| 集合不同观测降水数据优势，获取更为精细化降水产品，可以更好地再现区域降水时空异质性，这也使得多源降水数据精度评估、校正及融合应用成为当前研究热点。从降雨时空一致性、降雨量误差、日降雨事件探测能力方面对广西TRMM降雨产品进行了精度评估，并对比分析了TRMM对干旱的评估效果。结果表明：（1） 广西TRMM降雨产品与气象站观测降雨存在显著的时空相关性，日尺度相关系数最低为0.5~0.6，月、年尺度相关系数则均在0.7以上；（2） 广西TRMM降雨量总体略偏大，其相对偏差主要在0~10%；（3） TRMM产品在广西地区的日降雨事件探测能力优于全国平均水平，尤其在强降雨月份POD>0.75，但也存在降雨量较少的冬季月份准确率显著下降的现象。（4） TRMM降雨产品在广西干旱强度监测方面，能够揭示区域干旱的时空尺度效应和强度累积效应，具有比有限地面站点数据更精细化的空间异质性表达。相关成果有望促进区域多源降雨数据的校正及融合应用研究，为区域更有效的旱涝灾害评估、预报预警等提供科学支撑。 |
| 关键词: TRMM 时空一致性 误差 日降雨探测能力 干旱评估对比 |
| DOI：10.16032/j.issn.1004-4965.2019.051 |
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| ACCURACY ASSESSMENT OF TRMM RAINFALL DATA IN GUANGXI AT MULTIPLE TIME SCALES |
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YANG Xing-xing1, YANG Yun-chuan1,2,3, DENG Si-min1, LIAO Li-ping1,2,3, TIAN Yi1, MO Chong-xun1,2,3, CHEN Li-hua1,2,3
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1. College of Civil engineering and Architecture, Guangxi University, Nanning 530004, China;2. Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University,
Nanning 530004, China;3. College of Civil engineering and Architecture, Guangxi University, Nanning 530004, China
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| Abstract: |
| By integrating different observation precipitation data, more refined precipitation products can be produced to show the spatial and temporal heterogeneity of regional precipitation more accurately, making the accuracy evaluation, correction and fusion of multi-source precipitation data one of the current research hotspots. TRMM data in Guangxi are evaluated from the aspects of spatial-temporal consistency, rainfall error, detection ability of daily rainfall events and drought events. The results show that: (1) there is a significant spatiotemporal correlation between TRMM precipitation products and meteorological stations in Guangxi, with the lowest correlation coefficient of daily scale being 0.5~0.6, and the correlation coefficients of monthly and annual scales being above 0.7; (2) the total rainfall of TRMM in Guangxi is slightly larger, and its relative deviation is mainly between 0~10%; (3) The detection ability of rain events is better than the national average, especially in the strong rainfall months with POD>0.75, but there is less rainfall in the winter months when the accuracy rate drops significantly; (4) As for drought intensity monitoring in Guangxi, TRMM rainfall products can reveal the spatiotemporal scale effects and cumulative benefits of regional drought, and have more refined spatial heterogeneity expression than the limited ground station data. The results are expected to promote the correction and fusion application of regional multi-source rainfall data, so as to provide scientific support for better drought and flood disaster assessment, forecasting and prevention in the region. |
| Key words: TRMM spatial-temporal consistency rainfall error detection ability of daily rainfall events comparison of drought assessment |