Retrieval and analysis of OH (3-1) rotational temperature at Xinglong Station
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摘要: 中间层顶是地球大气响应太阳活动和低层大气波动变化的关键区域，中间层顶温度是理解中高层大气动力过程和气候变化的重要参数，OH气辉的转动温度常被用于监测中间层顶区域的长期变化。为研究该区域温度的长期变化，使用中国兴隆台站（40°24′N，117°35′E）地基红外光谱仪（Ground-Based Infrared Spectrometer，GBIS）在2017-2024年的OH（3-1）气辉光谱数据，通过多光谱全局优化拟合算法反演得到OH气辉的转动温度。研究发现OH（3-1）转动温度呈现出显著的季节性变化，通过分析OH（3-1）气辉的年平均转动温度、振幅和相位的变化，发现OH（3-1）转动温度受到太阳活动的影响显著，这一结果与其年均冬季温度和年均夏季温度的变化趋势一致。
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关键词:
- OH(3-1)转动温度 /
- GBIS /
- 多光谱全局优化拟合算法 /
- 反演
Abstract: The mesopause is a key region where the Earth's atmosphere responds to variations in solar activity and wave perturbations from the lower atmosphere. Temperature in this region is an essential parameter for understanding the dynamical processes and climate variability in the middle and upper atmosphere. Rotational temperature of OH airglow is widely used to monitor long-term changes near the mesopause. To investigate the long-term temperature variability in this region, OH(3-1) airglow spectra obtained by a Ground-Based Infrared Spectrometer (GBIS) at Xinglong Station (40°24′N, 117°35′E), China, from 2017 to 2024 were analyzed. The OH rotational temperature was retrieved using a multispectral global optimization fitting algorithm. The results reveal a pronounced seasonal variation in the OH(3-1) rotational temperature. Analysis of the annual mean temperature, amplitude, and phase indicates that the OH(3-1) rotational temperature is also influenced by solar activity, consistent with the variation trends of the annual mean winter and summer temperatures. -
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