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1998-2012年青藏高原TRMM3B43降水数据的校准

, PP. 900-911

Keywords: 降水,TRMM,3B43,青藏高原,加法修正法,随机森林

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Abstract:

运用1998-2012年青藏高原的TRMM3B43降水数据以及气象台站实测降水数据,对比分析了青藏高原地区TRMM3B43降水数据偏差分布规律。结果表明:(1)TRMM3B43降水数据在青藏高原地区存在明显误差,特别是降水量大的地区和月份,偏差量较大。(2)青藏高原地区TRMM3B43降水数据偏差分布与海拔、经纬度、降水量存在密切的关系。用偏差分布规律,加法修正法结合随机森林算法对青藏高原地区TRMM3B43降水数据进行了校准。经过校准之后,数据精度得到显著提高,有效增加了数据的可用性,多年月平均数据决定系数R2最大可达到0.9(3、10月),最小也接近于0.5(12月),效率系数E均为正值,最大可达到90(3、10月);多年季平均和多年平均降水数据中除了第一季度结果稍差外(决定系数R2为0.58),其余数据校准效果均较好。

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