EAGER: A New Look at the Middle Atmosphere through the Eyes of SABER (Sounding of the Atmosphere using Broadband Emission Radiometry)

EAGER：通过 SABRE 的视角对中层大气进行新的观察（使用宽带发射辐射测量法探测大气层）

• 批准号: 1301762
• 负责人: Alexander Kutepov
• 金额: $ 10.09万
• 依托单位: Catholic University of America
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-07-01 至 2017-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1301762&HistoricalAwards=false
• 关键词: EAGER; New; Look; Middle; Atmosphere

The investigators will study various Infrared (IR) emission mechanisms in the Mesosphere and Lower Thermosphere (MLT), which may be responsible for a largely unexplained enhanced IR feature at ~90 km. The Sounding of the Atmosphere using Broadband Emission Radiometry (SABER), one of four instruments on board of NASA's Thermosphere, Ionosphere, Mesosphere, Energetics and Dynamics (TIMED) mission, is a 10-channel broadband limb-scanning infrared radiometer covering the spectral range from 1.27 to 17 microns. SABER has already provided a decade worth of information about kinetic temperature, pressure, ozone, carbon dioxide, water vapor and atomic oxygen. The interpretation of these results, which are strongly affected by the quality of models of the IR emissions in the MLT, have crucial importance for understanding the physics and chemistry of this region. An IR limb emission feature that resembles a layer-like enhancement has been present since the beginnings of the satellite operations in SABER's 4.3 micron channel. This feature is localized at an altitude region that corresponds to tangent heights between 85-95 km and has a distinct spatial and temporal variability. Although the enhanced limb radiances are present at all latitudes and seasons, they appear to be stronger at the polar summer MLT. Preliminary analysis of observations from other spacecraft reveal similar features although those instruments operate significantly different, which indicate this is, at least in part, a real phenomena. This enhancement is not predicted by our current IR emission models in the MLT, in particular when compared to similar effects observed in additional channels. Due to a lack of understanding of its origins, this effect has been ignored for a decade and, as a result, is generally unknown by the aeronomy and space science communities. The investigators will study a number of radically different as well as interdisciplinary approaches, among them non-equilibrium chemistry of molecular, atomic and ionic compounds of MLT and their possible interactions with dust and ice particles, various potential mechanism of energy transfer from photolysis and chemical reaction products to molecular vibrations, non-LTE molecular emission, absorption, transformation and multiple scattering of radiation in various spectral regions, etc The investigation will address a feature that may alter the understanding of the CO2 characteristics in the MLT. As such, the results may have high impact on atmospheric chemistry and climate. Additionally, this study will provide a more robust analysis of IR radiances that can be later expanded to other space missions.

研究人员将研究中层和较低热球（MLT）中的各种红外（IR）发射机制，这可能导致在〜90 km的大部分无法解释的增强IR特征。使用宽带发射辐射测定法（SABER）的大气发声，这是NASA热层，电离层，电流，中级，能量和动力学（时机）的四种仪器之一，是10个通道宽带肢体扫描的红外辐射仪，覆盖了1.27至17微米的光谱范围。 Saber已经提供了有关动力学温度，压力，臭氧，二氧化碳，水蒸气和原子氧的十年信息。这些结果的解释受到了MLT中IR排放模型质量的强烈影响，对于理解该地区的物理和化学具有至关重要的重要性。自从Saber的4.3微米通道中的卫星操作开始以来，已经存在类似于层状增强的IR肢体发射功能。此特征位于高度区域，该高度与85-95 km之间的切线高度相对应，并且具有独特的空间和时间变异性。尽管在所有纬度和季节都存在增强的肢体辐射，但在Polar Summer MLT中似乎更强。对其他航天器的观测值的初步分析揭示了相似的特征，尽管这些仪器的运行差异很大，这表明这至少部分是一种实际现象。与在其他通道中观察到的类似效应相比，我们当前的IR发射模型在MLT中的当前IR发射模型无法预测这种增强。由于缺乏对其起源的了解，因此这种影响已被忽略了十年，因此，空中科学和太空科学社区通常不知道这种影响。 The investigators will study a number of radically different as well as interdisciplinary approaches, among them non-equilibrium chemistry of molecular, atomic and ionic compounds of MLT and their possible interactions with dust and ice particles, various potential mechanism of energy transfer from photolysis and chemical reaction products to molecular vibrations, non-LTE molecular emission, absorption, transformation and multiple scattering of radiation in various spectral regions, etc The调查将解决可能改变对MLT中二氧化碳特征的理解的功能。因此，结果可能对大气化学和气候产生很大影响。此外，这项研究将提供对IR辐射的更强大的分析，以后可以将其扩展到其他空间任务。