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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >MEASUREMENTS OF METHANE AND NITROUS OXIDE DISTRIBUTIONS BY THE IMPROVED STRATOSPHERIC AND MESOSPHERIC SOUNDER - RETRIEVAL AND VALIDATION
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MEASUREMENTS OF METHANE AND NITROUS OXIDE DISTRIBUTIONS BY THE IMPROVED STRATOSPHERIC AND MESOSPHERIC SOUNDER - RETRIEVAL AND VALIDATION

机译：改进的平流层和中间层测声器测量甲烷和一氧化二氮的分布-回收和验证。

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摘要

The improved stratospheric and mesospheric sounder (ISAMS) used the pressure modulation technique to observe infrared emissions from the atmosphere at 7.4 mu m and 7.8 mu m. The target gases, methane and nitrous oxide, both emit at these wavelengths and so their concentrations have been determined by joint retrieval from the available signals. This paper describes the measurement technique, the current retrieval scheme (version 10), and the data set produced. The version 10 data set comprises typically 2600 profiles per day on 180 days between September 26, 1991, and July 29, 1992. Retrieved profiles extend in altitude from 7 mbar to 0.08 mbar for methane and from 7 mbar to 0.8 mbar for nitrous oxide. The precision of the data is better than 20% over much of the range and estimated systematic uncertainties are less than 30%. Comparisons with coincident measurements show that the systematic uncertainties are a reasonable estimate for the methane data but reveal a much larger positive bias for the nitrous oxide data relative to other measurements. Accounting for aerosol contamination effects and a priori biases, ISAMS methane data are recommended for use in scientific studies at altitudes between 7 mbar (5 mbar in the tropics) and 0.1 mbar. ISAMS nitrous oxide data are recommended for use between 7 mbar and 1.0 mbar where relative rather than absolute values are required. [References: 39]
机译：改进的平流层和中层测深仪（ISAMS）使用压力调制技术观察了大气在7.4μm和7.8μm处的红外辐射。目标气体（甲烷和一氧化二氮）均以这些波长发射，因此它们的浓度已通过从可用信号中联合检索来确定。本文介绍了测量技术，当前的检索方案（版本10）以及生成的数据集。版本10数据集通常在1991年9月26日至1992年7月29日之间的180天内每天包含2600个剖面。所获取的剖面的甲烷高度从7 mbar扩展到0.08 mbar，一氧化二氮的高度从7 mbar扩展到0.8 mbar。在大部分范围内，数据的精度均优于20％，估计的系统不确定度小于30％。与同时进行的测量结果的比较表明，系统不确定性是对甲烷数据的合理估计，但与其他测量结果相比，一氧化二氮数据的正偏差要大得多。考虑到气溶胶污染的影响和先验偏差，建议将ISAMS甲烷数据用于7 mbar（热带地区为5 mbar）至0.1 mbar之间的海拔高度的科学研究中。建议在要求相对而不是绝对值的7 mbar和1.0 mbar之间使用ISAMS一氧化二氮数据。 [参考：39]

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