Observed daily minimum temperatures

Daily minimum temperatures based on the truncated NARR reanalysis data (using 3000 leading EOFs, which account for over 99% of the total surface temperature variance over land).本数据集为基于截断NARR再分析资料得到的每日最低气温数据，处理过程中采用了前3000个主导经验正交函数（Empirical Orthogonal Functions，EOFs），该组EOFs可解释陆地区域地表气温总方差的99%以上。