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Li, T, Ban, C, Fang, X et al. (8 more authors) (2018) Climatology of mesopause region nocturnal temperature, zonal wind and sodium density observed by sodium lidar over Hefei, China (32⁰ N, 117⁰ E). Atmospheric Chemistry and Physics, 18 (16). pp. 11683-11695. ISSN 1680-7316
Abstract
The University of Science and Technology of China narrowband sodium temperature and wind lidar, located in Hefei, China (32°N, 117°E), has made routine nighttime measurements since January 2012. A total of 154 nights (∼1400h) of vertical profiles of temperature, sodium density, and zonal wind and 83 nights (∼800h) of vertical flux of gravity wave (GW) zonal momentum in the mesopause region (80–105km) were obtained during the period from 2012 to 2016. For temperature, it is most likely that the diurnal tide dominates below 100km in spring, while the semidiurnal tide dominates above 100km throughout the year. A clear semiannual variation in temperature is revealed near 90km, in phase with the tropical mesospheric semiannual oscillation (MSAO). The variability in sodium density is positively correlated with temperature below 95km, suggesting that in addition to dynamics, the chemistry also plays an important role in the formation of sodium atoms. The seasonal variability in sodium density observed by both lidar and satellite generally agrees well with a whole atmosphere model simulation using an updated meteoric input function which includes different cosmic dust sources. For zonal wind, the diurnal tide dominates in both spring and fall, while semidiurnal tide dominates in winter. The observed semiannual variation in zonal wind near 90km is out of phase with that in temperature, consistent with the tropical MSAO. The lidar observations generally agree with satellite and meteor radar observations as well as model simulations at similar latitude. The 50–70% of zonal momentum flux is induced by short-period (10min–2h) GWs. The large zonal momentum flux in summer and winter due to short-period GWs is clearly anticorrelated with eastward zonal wind maxima below 90km, suggesting the filtering of short-period GWs by the SAO wind.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © Author(s) 2018. This work is distributed under the Creative Commons Attribution 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 Engineering & Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds) > Astrophysics (Leeds) |
Funding Information: | Funder Grant number EU - European Union 291332 |
Depositing User: | Symplectic Publications |
Date Deposited: | 03 Sep 2018 11:15 |
Last Modified: | 13 Dec 2019 12:21 |
Status: | Published |
Publisher: | EGU (Copernicus Publications) |
Identification Number: | 10.5194/acp-18-11683-2018 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:135179 |
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Climatology of mesopause region nocturnal temperature, zonal wind, and sodium density observed by sodium lidar over Hefei, China (32°N, 117°E). (deposited 13 Dec 2019 12:20)
- Climatology of mesopause region nocturnal temperature, zonal wind and sodium density observed by sodium lidar over Hefei, China (32⁰ N, 117⁰ E). (deposited 03 Sep 2018 11:15) [Currently Displayed]