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ACP | Articles | Volume 19, issue 6
Atmos. Chem. Phys., 19, 3769–3777, 2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue: Layered phenomena in the mesopause region (ACP/AMT inter-journal...

Atmos. Chem. Phys., 19, 3769–3777, 2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 25 Mar 2019

Research article | 25 Mar 2019

Photochemistry on the bottom side of the mesospheric Na layer

Tao Yuan et al.

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Long-term midlatitude mesopause region temperature trend deduced from quarter century (1990–2014) Na lidar observations
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Subject: Gases | Research Activity: Atmospheric Modelling | Altitude Range: Mesosphere | Science Focus: Chemistry (chemical composition and reactions)
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Revised manuscript accepted for ACP
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Cited articles

Brasseur, G. P. and Solomon, S.: Aeronomy of the Middle Atmosphere: Chemistry and Physics of the Stratosphere and Mesosphere, Springer, New York, 2005. 
Carrillo-Sánchez, J. D., Nesvorný, D., Pokorný, P., Janches, D., and Plane, J. M. C.: Sources of cosmic dust in the Earth's atmosphere, Geophys. Res. Lett., 43, 11979–11986,, 2016. 
Chen, H., White, M. A., Krueger, D. A., and She, C. Y.: Daytime mesopause temperature measurements using a sodium-vapor dispersive Faraday filter in lidar receiver, Opt. Lett., 21, 1003–1005, 1996. 
Clemesha, D. M., Batista, P. P., and Simonich, D. M.: Tide-induced oscillations in the atmospheric sodium layer, J. Atmos. Sol.-Terr. Phys., 64, 1321–1325, 2002. 
Cox, R. M., Self, D. E., and Plane, J. M. C.: A study of the reaction between NaHCO3 and H: apparent closure on the neutral chemistry of sodium in the upper mesosphere, J. Geophys. Res., 106, 1733–1739, 2001. 
Publications Copernicus
Short summary
The Na layer in the upper atmosphere is very sensitive to solar radiation and varies considerably during sunrise and sunset. In this paper, we use the lidar observations and an advanced model to investigate this process. We found that the variation is mostly due to the changes in several photochemical reactions involving Na compounds, especially NaHCO3. We also reveal that the Fe layer in the same region changes more quickly than the Na layer due to a faster reaction rate of FeOH to sunlight.
The Na layer in the upper atmosphere is very sensitive to solar radiation and varies...
Final-revised paper