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首页> 外文期刊>Icarus: International Journal of Solar System Studies >O_2(a~1D_g) dayglow limb observations on Mars by SPICAM IR on Mars-Express and connection to water vapor distribution
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O_2(a~1D_g) dayglow limb observations on Mars by SPICAM IR on Mars-Express and connection to water vapor distribution

机译：利用SPICAM IR对Mars-Express进行的O_2（a〜1D_g）夜辉肢体在火星上的观测以及与水汽分布的关系

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摘要

The 1.27-μm O_2(a~1D_g) dayglow on Mars is a product of the ozone photolysis by solar UV radiation. The intensity of the O_2(a~1D_g) emission rate depends on ozone concentration, atmospheric density and kinetic parameters of involved photochemical reactions. In turn, the distribution of ozone is sensitive to the vertical and spatial distribution of water vapor, which is an effective destructor of O_3. SPICAM IR on the Mars-Express mission measures the O_2(~1D_g) dayglow with spectral resolving power of 2200. The results of 147 limb observations from 2004 to 2013 are reported. Limb resolution of the instrument is variable and exceeds the scale height of the atmosphere. The slant emission rate reaches a maximum at the high Northern latitudes at northern and southern springs L_s = 0–50° and 160–190°, respectively and a minimum in middle and low latitudes at southern summer L_s = 200–300°. We have compared the SPIVAM O_2(a~1D_g) limb profiles with the General Circulation Model simulation by the Laboratoire de Meteorologie Dynamique (LMD GCM, Lefèvre, F., Lebonnois, S., Montmessin, F., Forget, F. [2004]. J. Geophys. Res. 109, E07004. http://dx.doi.org/10.1029/2004JE002268; Lefèvre, F., et al. [2008]. Nature 454(7207), 971–975) reduced to the vertical resolution of the instrument. The GCM includes the radiative effect of the water clouds and an interactive dust scheme, and well reproduces Martian Climate Sounder (MCS) temperature profiles (Clancy, R. Todd et al. [2012]. J. Geophys. Res. 117, 10. http://dx.doi.org/10.1029/2011JE004018). The model underestimates the emission for Ls = 0–50°, Ls = 160–180° and overestimates it from L_s = 60° to L_s = 150° at high Northern latitudes. In the Southern hemisphere the model underestimates the emission for L_s = 170–200° and overestimates it for L_s = 200–230° at high Southern latitudes. The disagreement could be related to the water vapor distribution as the model reproduces it. The most recent version of the LMD GCM including microphysical representation of cloud formation taking into account the effect of dust scavenging by water ice clouds (Navarro, T., Madeleine, J.-B., Montmessin, F., Forget, F., Spiga, A., Millour, E. [2013]. Modeling of the martian water cycle with an improved representation of water ice clouds. European Planetary Science Congress 2013, EPSC Abstracts, vol. 8, EPSC2013-203) gives much better agreement with SPICAM O_2(a~1D_g) dayglow limb observations. Characterization of the Mars water cycle by GCMs continues to improve, and the observations of the O_2(a~1D_g) dayglow offer a powerful tool for its validation.
机译：火星上的1.27μmO_2（a〜1D_g）日光是太阳紫外线辐射使臭氧光解的产物。 O_2（a〜1D_g）发射速率的强度取决于臭氧浓度，大气密度和参与的光化学反应的动力学参数。反过来，臭氧的分布对水蒸气的垂直和空间分布很敏感，这是O_3的有效破坏者。火星快车任务上的SPICAM IR测量了O_2（〜1D_g）的日光，光谱分辨力为2200。据报道，2004年至2013年共进行了147次肢体观测。仪器的肢体分辨率是可变的，并且超过了大气的标度高度。在北部和南部春季L_s = 0–50°和160–190°时，偏北发射率分别在北部高纬度地区达到最大值，而在南部夏季L_s = 200–300°时，中，低纬度地区的偏斜发射率最低。我们已将SPIVAM O_2（a〜1D_g）肢体轮廓与由气象学实验室动力实验室（LMD GCM，Lefèvre，F.，Lebonnois，S.，Montmessin，F.，Forget，F. [2004] [J. Geophys。Res。109，E07004。http://dx.doi.org/10.1029/2004JE002268;Lefèvre，F.等人[2008]。Nature 454（7207），971–975）还原为仪器的垂直分辨率。 GCM包括水云的辐射效应和互动式除尘方案，并很好地再现了火星气候探测仪（MCS）的温度剖面（Clancy，R. Todd等人[2012]。J. Geophys。Res。117，10。 http://dx.doi.org/10.1029/2011JE004018）。该模型低估了Ls = 0–50°，Ls = 160–180°的辐射，并高估了北高纬度地区从L_s = 60°到L_s = 150°的辐射。在南半球，该模型低估了南纬高纬度地区的L_s = 170–200°的辐射，而高估了L_s = 200–230°的辐射。当模型重现时，分歧可能与水蒸气分布有关。 LMD GCM的最新版本包括云形成的微观物理表示，同时考虑了水冰云清除灰尘的影响（Navarro，T.，Madeleine，J.-B.，Montmessin，F.，Forget，F.， Spiga，A.，Millour，E. [2013]。用改进的水冰云表示法对火星水循环进行建模。2013年欧洲行星科学大会，EPSC摘要，第8卷，EPSC2013-203）与SPICAM O_2（a〜1D_g）夜光肢体观察。 GCM对火星水循环的表征持续改善，对O_2（a〜1D_g）日光的观测为验证其提供了有力工具。

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