Abstract

The accuracy of the ERA-Interim reanalysis data on total atmospheric water vapor is assessed using the AMSR2 (Advanced Microwave Scanning Radiometer 2) measurements. The values of total column water vapor over the open ocean obtained by applying the improved algorithm to the ASMR2 data are used as reference ones to evaluate the quality of water vapor content reproduced by the reanalysis. The analysis performed for the Arctic region for 2015 and based on the average daily values demonstrated a high accuracy of ERA-Interim data on the Arctic water vapor equal to 1.1 kg/m², which decreases for the water vapor values above 15 kg/m². Under such conditions, the ERA-Interim data underestimate the water vapor content by several kg/m². The accuracy of ERA-Interim total water vapor over the seas of the eastern sector of the Russian Arctic is 30% lower than for the other Arctic regions.

中文翻译：

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根据AMSR2数据估算的ERA中期数据对北极总大气水汽的准确性的分析

摘要

使用AMSR2（高级微波扫描辐射计2）测量评估ERA-Interim重新分析数据对大气总水蒸气的准确性。通过将改进的算法应用于ASMR2数据获得的开放海洋上的总柱状水蒸气值被用作参考值，以评估通过再分析得到的水蒸气含量的质量。对2015年北极地区进行的分析和基于日均值的分析表明，北极水蒸气等于1.1 kg / m ²的ERA-Interim数据具有很高的准确性，而水蒸气值高于15 kg / m时，ERA-Interim数据的准确性下降²。在这种情况下，ERA-Interim数据低估了水蒸气含量几个kg / m ²。俄罗斯北极东部地区海洋上空的ERA临时总水汽的准确性比其他北极地区低30％。