从SCIAMACHY名义临边谱反演中层一氧化氮
Retrieval of nitric oxide in the mesosphere from SCIAMACHY nominal limb spectra
摘要：
我们提出了一个从扫描成像吸收光谱仪测量大气CHartographY（SCIAMACHY，在Envisat）名义临边模式（0- 91公里）的一氧化氮（NO）数密度的检索算法。NO数密度是从230- 300 nm范围内的γ波段的大气发射中得到的，由SCIAMACHY紫外线（UV）通道1测量。该反演是根据中层和低热层模式（MLT，50- 150 km）NO反演（Bender等人，2013，arXiv：1808.02388），包括相同的3-D射线追踪、2-D检索网格以及相对于高度和纬度的规则化。由于名义模式的临边扫描仅延伸到约91公里，我们使用NO密度在较低的热层（92公里以上），来自经验模型，作为先验输入。先验是一氧化氮经验模型（NOEM; Marsh等人，2004）和从MLT NO数据比较得到的回归模型（Bender等人，2015）。我们的算法产生合理的NO数密度从60到85公里的SCIAMACHY名义肢体模式扫描。使用先验输入大大减少了不正确的归属NO从低热层，没有直接的临边测量。在65- 80公里的高度范围内，垂直分辨率为5 - 10公里。分析所有的SCIAMACHY标称肢体扫描提供了近10年（从2002年8月至2012年4月）的每日NO测量在这个高度范围内。这提供了一个独特的数据记录NO在高层大气，是非常宝贵的限制NO在中间层，特别是在此期间测试和验证化学气候模式。
英文摘要：
We present a retrieval algorithm for nitric oxide (NO) number densities from measurements from the SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY (SCIAMACHY, on Envisat) nominal limb mode (0--91 km). The NO number densities are derived from atmospheric emissions in the gamma bands in the range 230--300 nm, measured by the SCIAMACHY ultra-violet (UV) channel 1. The retrieval is adapted from the mesosphere and lower thermosphere mode (MLT, 50--150 km) NO retrieval (Bender et al., 2013, arXiv:1808.02388), including the same 3-D ray tracing, 2-D retrieval grid, and regularisations with respect to altitude and latitude. Since the nominal mode limb scans extend only to about 91 km, we use NO densities in the lower thermosphere (above 92 km), derived from empirical models, as a priori input. The priors are the Nitric Oxide Empirical Model (NOEM; Marsh et al., 2004) and a regression model derived from the MLT NO data comparison (Bender et al., 2015). Our algorithm yields plausible NO number densities from 60 to 85 km from the SCIAMACHY nominal limb mode scans. Using a priori input substantially reduces the incorrect attribution of NO from the lower thermosphere, where no direct limb measurements are available. The vertical resolution lies between 5 and 10 km in the altitude range 65--80 km. Analysing all SCIAMACHY nominal limb scans provides almost 10 years (from August 2002 to April 2012) of daily NO measurements in this altitude range. This provides a unique data record of NO in the upper atmosphere and is invaluable for constraining NO in the mesosphere, in particular for testing and validating chemistry climate models during this period.
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