Energy Conservation in a Cooling and Contracting Thermosphere

IF 3.4 2区地球科学 Q2 METEOROLOGY & ATMOSPHERIC SCIENCES

Journal of Geophysical Research: Atmospheres Pub Date : 2025-08-20 DOI:10.1029/2024JD042513

Nabil Nowak, Martin G. Mlynczak, Linda Hunt, B. Thomas Marshall, Christopher J. Mertens

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Abstract

Time series of infrared radiated power by thermospheric nitric oxide (NO) and carbon dioxide (CO₂), and their total power (NO + CO₂) (measured by the SABER instrument on the NASA TIMED satellite from 2002 through 2023) have been analyzed for long-term trends. Solar and geomagnetic indices (F_10.7, Ap, Dst) are used with multiple linear regression to provide trend approximations for the radiated infrared power. There are no statistically significant trends observed for NO and total radiated power, and the trend in CO₂ radiated power is not statistically significant at 2-sigma (95%) confidence level. The thermosphere continues to radiate a constant amount of infrared energy over time after accounting for natural variability, despite more than two decades of cooling due to increasing CO₂. These results demonstrate energy conservation on decadal timescales and validate the mechanism of thermospheric greenhouse cooling. The long-term radiometric stability of the SABER instrument enables these results.

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冷却和收缩热层中的能量守恒

本文分析了热层一氧化氮（NO）和二氧化碳（CO2）红外辐射功率的时间序列，以及它们的总功率（NO + CO2）（由NASA TIMED卫星上的SABER仪器从2002年到2023年测量）的长期趋势。利用太阳和地磁指数（F10.7, Ap, Dst）与多元线性回归提供了辐射红外功率的趋势近似。在2-sigma（95%）置信水平上，no和总辐射功率的变化趋势没有统计学意义，CO2辐射功率的变化趋势也没有统计学意义。考虑到自然变率后，尽管由于二氧化碳增加而冷却了20多年，但随着时间的推移，热层继续辐射出等量的红外能量。这些结果证明了在年代际尺度上的能量节约，并验证了热层温室降温的机制。SABER仪器的长期辐射稳定性使这些结果成为可能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Geophysical Research: Atmospheres Earth and Planetary Sciences-Geophysics

CiteScore

7.30

自引率

11.40%

发文量

684

期刊介绍： JGR: Atmospheres publishes articles that advance and improve understanding of atmospheric properties and processes, including the interaction of the atmosphere with other components of the Earth system.