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ACP | Articles | Volume 19, issue 6
Atmos. Chem. Phys., 19, 3769–3777, 2019
https://doi.org/10.5194/acp-19-3769-2019
© 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
https://doi.org/10.5194/acp-19-3769-2019
© 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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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...
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