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DOI	10.5194/acp-19-3769-2019
	Photochemistry on the bottom side of the mesospheric Na layer
	Yuan T.; Feng W.; Plane J.M.C.; Marsh D.R.
发表日期	2019
ISSN	16807316
起始页码	3769
结束页码	3777
卷号	19 期号:6
英文摘要	Lidar observations of the mesospheric Na layer have revealed considerable diurnal variations, particularly on the bottom side of the layer, where more than an order-of-magnitude increase in Na density has been observed below 80km after sunrise. In this paper, multi-year Na lidar observations are utilized over a full diurnal cycle at Utah State University (USU) (41.8°N, 111.8°W) and a global atmospheric model of Na with 0.5km vertical resolution in the mesosphere and lower thermosphere (WACCM-Na) to explore the dramatic changes of Na density on the bottom side of the layer. Photolysis of the principal reservoir NaHCO3 is shown to be primarily responsible for the increase in Na after sunrise, amplified by the increased rate of reaction of NaHCO3 with atomic H, which is mainly produced from the photolysis of 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 21 August 2017, when a decrease and recovery of the Na density on the bottom side of the layer were observed. Lastly, the model simulation shows that the Fe density below around 80km increases more strongly and earlier than observed Na changes during sunrise because of the considerably faster photolysis rate of its major reservoir of FeOH. © 2019 Author(s).
语种	英语
scopus关键词	atmospheric chemistry; atmospheric modeling; diurnal variation; lidar; mesosphere; photochemistry; sodium; thermosphere; United States; Utah
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/144549
作者单位	Physics Department, Utah State University, Logan, UT, United States; Center for Atmospheric and Space Sciences, Utah State University, Logan, UT, United States; School of Chemistry, University of Leeds, Leeds, United Kingdom; National Centre for Atmospheric Science, University of Leeds, Leeds, United Kingdom; National Center for Atmospheric Research, Boulder, CO, United States
推荐引用方式 GB/T 7714	Yuan T.,Feng W.,Plane J.M.C.,et al. Photochemistry on the bottom side of the mesospheric Na layer[J],2019,19(6).
APA	Yuan T.,Feng W.,Plane J.M.C.,&Marsh D.R..(2019).Photochemistry on the bottom side of the mesospheric Na layer.Atmospheric Chemistry and Physics,19(6).
MLA	Yuan T.,et al."Photochemistry on the bottom side of the mesospheric Na layer".Atmospheric Chemistry and Physics 19.6(2019).