Improved estimation of the infrared CO2 band cooling rate in the lower thermosphere due to E-V energy transfer from O(1D)

Vladimir P. Ogibalov

doi:10.1117/12.2542457

18 December 2019 Improved estimation of the infrared CO₂ band cooling rate in the lower thermosphere due to E-V energy transfer from O(¹D)

Vladimir P. Ogibalov

Author Affiliations +

Proceedings Volume 11208, 25th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics; 112080Q (2019) https://doi.org/10.1117/12.2542457
Event: XXV International Symposium, Atmospheric and Ocean Optics, Atmospheric Physics, 2019, Novosibirsk, Russian Federation

Abstract

A mechanism of excitation of the CO₂ vibrational states due to E-V energy transfer through a chain O(¹D) → (N₂(v), v=1−5 and O₂(v), v=1−4) ↔ CO₂(v₃) was updated in the non-LTE model for the CO₂ infrared emissions in the Earth atmosphere. It was found that including this mechanism results in significant increase of populating the excited vibrational states of N₂, O₂ and CO₂ followed by significant increase of cooling rate due to transfer of radiation in the CO₂ bands in the altitude region of 90-110 km. Main inferences are as follows. For noon conditions at the equator for spring equinox under average level of solar activity (F_10.7=90), about 23-25 per cent of flux of solar UV energy, which spent to excitation the O(¹D) state after photodissociation of ozone and molecular oxygen, transfers to both N₂(v) and O₂(v) vibrational states due to E-V energy exchange during collisions. After that, a part of this flux transfers to the CO₂(v₃) states due to intermolecular V-V energy exchange. Finally, the energy is radiated from the atmosphere mainly in the 4.3μm fundamental band of the CO₂ principal isotope with an efficiency of 0.9, 0.87, 0.82, 0.6, and 0.25 at the altitudes of 90, 95, 100, 105, and 110 km, respectively. This provides an additional cooling of the MLT region with a maximum rate of order 6.0 K/day at 105 km. Such an estimation is more larger than it had been obtained in previous investigations. So, comparing to the most recent estimations of the 15 μm CO₂ band cooling rate, this seems to be a valuable additional source of cooling of the lower thermosphere comparing to the most recent estimations of the 15 μm CO₂ band cooling rate.

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Vladimir P. Ogibalov "Improved estimation of the infrared CO₂ band cooling rate in the lower thermosphere due to E-V energy transfer from O(¹D)", Proc. SPIE 11208, 25th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics, 112080Q (18 December 2019); https://doi.org/10.1117/12.2542457

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KEYWORDS

Atmospheric modeling

Thermosphere

Infrared radiation

Energy transfer

Molecules

Atmospheric physics

Earth's atmosphere

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