一种新的爱因斯坦系数方法,用于在非局部热平衡状态下检索中断期-低热层大气温度
Optics express
|September 15, 2023
概括
使用爱因斯坦系数的新方法准确地检索了中断期-下热层 (MLT) 区域的大气温度. 这种方法克服了光谱线强度方法的局限性,在更高的海拔上提高了温度测量精度,高达45K.
科学领域:
- 大气科学 大气科学
- 航空学是航空学的.
- 地质物理学 地质物理学
背景情况:
- 介质期-低热层 (MLT) 区域对于理解大气动力学和温度变化至关重要.
- 使用光谱线强度的传统温度检索方法在较高的海拔上面临越来越多的错误,原因是非局部热平衡 (非LTE).
研究的目的:
- 提出和验证基于爱因斯坦系数的MLT区域 (92-140公里) 的新型温度检索方法.
- 在非LTE条件下解决基尔霍夫定律和光谱线强度方法的局限性.
主要方法:
- 利用迈克尔森干扰仪的空气发光辐射强度图像进行全球高分辨率热层成像 (MIGHTI) 测量.
- 在非LTE状态下应用了基于爱因斯坦系数的温度检索方法.
- 结果与光谱线强度检索和大气化学实验里埃变换光谱仪 (ACE-FTS) 数据进行了比较.
主要成果:
- 以爱因斯坦系数方法证明,在92-120公里之间,温度偏差不超过15K.
- 由于N2空气发光光谱的影响,在120-140公里之间偏差增加到45K.
- 与光谱线强度检索相比,双通道组合的自我一致性提高了85K.
结论:
- 爱因斯坦系数方法提供了一种更合理,更准确的方法来检索非LTE条件下的MLT区域的大气温度.
- 这种方法显著提高了现有的光谱线强度技术的准确性和可靠性.
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