Improvements in the profiles and distributions of nitric acid and nitrogen dioxide with the LIMS version 6 dataset
Improvements in the profiles and distributions of nitric acid and nitrogen dioxide with the LIMS version 6 dataset
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LIMS 版本 6 数据集改进了硝酸和二氧化氮的概况和分布
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发表时间：
2010
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通讯作者：
G. Lingenfelser
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文献类型：
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作者：
E. Remsberg;M. Natarajan;B. Marshall;L. Gordley;R. Thompson;G. Lingenfelser
摘要。本文描述了采用更新后的第6版（V6）算法和2002年存档处理后的Nimbus 7号平流层边缘红外监测仪（LIMS） 1978/1979年的硝酸（HNO3）和二氧化氮（NO2）剖面和分布的质量。在此开发并提供了对这两种方法的精密度和准确度的估计。除了在平流层上层，CO2的干扰效应被V6更好地解释外，V6 HNO3剖面的特征与早期LIMS版本5 （V5）剖面相对没有变化。在平流层中高层，反演的V6 NO2的精度也显著提高，这主要是由于其谱线参数的改善，以及相应的V6温度和水汽剖面的偏差减小。由于这些重要的更新，对HNO3/NO2比值、日-夜NO2比值剖面的理论计算，以及对极夜期间中间层NO2产量及其下降到平流层上层的估计，有了更好的一致性。特别是，平流层中高层二氧化氮的结果也应该与最近的卫星传感器得到的结果更加兼容，因为二氧化氮谱线自旋分裂的影响现在已经用LIMS V6算法计算了。LIMS剖面在轨道上的精度提高和更频繁的检索为这两个物种在压力表面上的地图分析提供了更好的连续性和细节。认为利用LIMS V6数据可以定量研究整个平流层氮氧化物对臭氧的化学效应。
Abstract. The quality of the Nimbus 7 Limb Infrared Monitor of the Stratosphere (LIMS) nitric acid (HNO3) and nitrogen dioxide (NO2) profiles and distributions of 1978/1979 are described after their processing with an updated, Version 6 (V6) algorithm and subsequent archival in 2002. Estimates of the precision and accuracy of both of those species are developed and provided herein. The character of the V6 HNO3 profiles is relatively unchanged from that of the earlier LIMS Version 5 (V5) profiles, except in the upper stratosphere where the interfering effects of CO2 are accounted for better with V6. The accuracy of the retrieved V6 NO2 is also significantly better in the middle and upper stratosphere, due to improvements in its spectral line parameters and in the reduced biases for the accompanying V6 temperature and water vapor profiles. As a result of these important updates, there is better agreement with theoretical calculations for profiles of the HNO3/NO2 ratio, day-to-night NO2 ratio, and with estimates of the production of NO2 in the mesosphere and its descent to the upper stratosphere during polar night. In particular, the findings for middle and upper stratospheric NO2 should also be more compatible with those obtained from more recent satellite sensors because the effects of the spin-splitting of the NO2 lines are accounted for now with the LIMS V6 algorithm. The improved precisions and more frequent retrievals of the LIMS profiles along their orbit tracks provide for better continuity and detail in map analyses of these two species on pressure surfaces. It is judged that the chemical effects of the oxides of nitrogen on ozone can be studied quantitatively throughout the stratosphere with the LIMS V6 data.