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Yuan, T, Feng, W orcid.org/0000-0002-9907-9120, Plane, JMC orcid.org/0000-0003-3648-6893 et al. (1 more author) (2018) Photochemistry on the under side of the mesospheric Na layer. Atmospheric Chemistry and Physics Discussions. ISSN 1680-7367
Abstract
Lidar observations of the mesospheric Na layer have revealed considerable diurnal variations 10 particularly on the underside of the main layer where more than an order-of-magnitude increase of Na 11 density has been observed below 80 km after sunrise. In this paper, multi-year Na lidar observations over 12 a full diurnal cycle at Utah State University (USU) (41.8°N, 111.8°W) and a global atmospheric model of 13 Na with 0.5 km vertical resolution in the mesosphere lower thermosphere (WACCM-Na) are utilized to 14 explore the dramatic changes of Na density on the layer underside. Photolysis of the principal reservoir 15 NaHCO3 is shown to be primarily responsible for the increase in Na after sunrise, amplified by the 16 increased rate of reaction of NaHCO3 with atomic H, which is mainly produced from the photolysis of 17 H2O and the reaction of OH with O3. This finding is further supported by Na lidar observation at USU during the solar eclipse (> 96% totality) event on August 21st 18 , 2017, when a decrease and recovery of the 19 Na density on the underside of the layer were observed. Lastly, the model simulation shows that the Fe 20 density underside around 80 km increases larger and earlier than observed Na changes during sunrise 21 because of the considerably faster photolysis rate of its major reservoir FeOH.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © Author(s) 2018. This discussion paper is under the terms of the CC BY 4.0 License. |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemistry (Leeds) > Physical Chemistry (Leeds) The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > National Centre for Atmos Science (NCAS) (Leeds) |
Funding Information: | Funder Grant number EU - European Union 291332 |
Depositing User: | Symplectic Publications |
Date Deposited: | 19 Dec 2019 11:41 |
Last Modified: | 23 Jan 2020 23:59 |
Status: | Published |
Publisher: | European Geosciences Union |
Identification Number: | 10.5194/acp-2018-1017 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:152785 |
Available Versions of this Item
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Photochemistry on the under side of the mesospheric Na layer. (deposited 19 Dec 2019 11:41)
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- Photochemistry on the bottom side of the mesospheric Na layer. (deposited 19 Mar 2019 15:49)