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利用改进的区域优化平均法重建过去1400年北半球夏季平均温度

DOI: 10.11928/j.issn.1001-7410.2015.05.02, PP. 1064-1070

Keywords: 区域优化平均法,球谐分析,协方差模式,过去1400年夏季温度重建,北半球

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Abstract:

区域优化平均法是一种有效的过去温度重建方法。它具有使用较少的数据达到较高重建精度的优点,能较好地解决过去温度重建过程中数据分布稀疏的问题。然而,区域优化平均法只能重建局部区域内的平均温度,无法重建较大范围的平均温度。为克服该缺陷,本文引入球谐分析法改进现有方法,使区域优化平均法可以计算全球或半球的平均温度。本文使用ClimaticResearchUnit(CRU)的年平均温度数据计算1951~2013年全球年平均温度序列,以验证该方法的可靠性。在此基础上重建了过去1400年北半球夏季平均温度序列。结果表明,改进的区域优化平均法可以较好地重建过去温度序列。

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