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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >NON-LOCAL THERMODYNAMIC EQUILIBRIUM MODEL FOR H2O 6.3 AND 2.7-MU-M BANDS IN THE MIDDLE ATMOSPHERE
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NON-LOCAL THERMODYNAMIC EQUILIBRIUM MODEL FOR H2O 6.3 AND 2.7-MU-M BANDS IN THE MIDDLE ATMOSPHERE

机译：大气中H2O 6.3和2.7-MU-M带的非局部热力学平衡模型

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A non-local thermodynamic equilibrium radiative transfer model is presented for the populations of H2O and O-2(1) vibrational levels in the middle atmosphere. Radiative transfer in the H2O bands is treated using the Curtis matrix method, and an exhaustive review of the collisional processes and their rate constants affecting the populations of these levels has been carried out. The near resonant vibrational-vibrational coupling between H2O(010) and O-2(1) is crucial for establishing their respective populations in the mesosphere. The population of H2O(010) starts departing from LTE significantly above about 65 km at night, this precise altitude being dependent on the temperature structure. At daytime, non-LTE begins at approximately the same height but is significantly enhanced with respect to nighttime. The principal additional daytime excitation processes are absorption of solar radiation by H2O at 2.7 and 6.3 mu m in the upper mesosphere and lower thermosphere and excitation from the photodissociation of O-3 through O-2(1) in the lower mesosphere. A sensitivity study of the H2O and O-2(1) vibrational temperatures to the atmospheric and model parameters has been carried out. A preliminary analysis of ISAMS/UARS measurements in the 6.9-mu m H2O pressure-modulated (PM) and wideband (WB) channels is presented. The measurements show enhancements in the daytime radiances in both channels, as compared to the nighttime values, above about 55 km. The effect is larger in the WE channel. Comparisons with the model show that non-LTE excitation of the H2O(010) and (020) levels is responsible. [References: 58]
机译：针对中层大气中H2O和O-2（1）的振动能级，提出了一个非局部热力学平衡辐射传递模型。使用柯蒂斯矩阵方法处理了H2O波段中的辐射传递，并且对碰撞过程及其影响这些水平人群的速率常数进行了详尽的综述。 H2O（010）和O-2（1）之间的近共振振动-振动耦合对于在中层建立各自的种群至关重要。 H2O（010）的人口在晚上约65 km以上开始明显偏离LTE，此精确高度取决于温度结构。在白天，非LTE从大约相同的高度开始，但相对于夜间而言明显增强。主要的日间激发过程是上部中层和下部热层中H2O在2.7和6.3μm处吸收太阳辐射，以及下部中层O-3通过O-2（1）的光解离激发。进行了H2O和O-2（1）振动温度对大气和模型参数的敏感性研究。初步分析了ISA-MS / UARS在6.9微米H2O压力调制（PM）和宽带（WB）通道中的测量结果。测量结果表明，与夜间值相比，两个通道的白天辐射率都增加了约55公里。在WE通道中效果更大。与模型的比较表明，H2O（010）和（020）的非LTE激发是负责任的。 [参考：58]

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