气候变化领域集成服务门户(CCPortal): Can VHF radars at polar latitudes measure mean vertical winds in the presence of PMSE?

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DOI	10.5194/acp-19-4485-2019
	Can VHF radars at polar latitudes measure mean vertical winds in the presence of PMSE?
	Gudadze N.; Stober G.; Chau J.L.
发表日期	2019
ISSN	16807316
起始页码	4485
结束页码	4497
卷号	19 期号:7
英文摘要	Mean vertical velocity measurements obtained from radars at polar latitudes using polar mesosphere summer echoes (PMSEs) as an inert tracer have been considered to be non-representative of the mean vertical winds over the last couple of decades. We used PMSEs observed with the Middle Atmosphere Alomar Radar System (MAARSY) over Andøya, Norway (69.30°N, 16.04°E), during summers of 2016 and 2017 to derive mean vertical winds in the upper mesosphere. The 3-D vector wind components (zonal, meridional and vertical) are based on a Doppler beam swinging experiment using five beam directions (one vertical and four oblique). The 3-D wind components are computed using a recently developed wind retrieval technique. The method includes full non-linear error propagation, spatial and temporal regularisation, and beam pointing corrections and angular pointing uncertainties. Measurement uncertainties are used as weights to obtain seasonal weighted averages and characterise seasonal mean vertical velocities. Weighted average values of vertical velocities reveal a weak upward behaviour at altitudes ∼ 84-87 km after eliminating the influence of the speed of falling ice. At the same time, a sharp decrease (increase) in the mean vertical velocities at the lower (upper) edges of the summer mean altitude profile, which are attributed to the sampling issues of the PMSE due to disappearance of the target corresponding to the certain regions of motions and temperatures, prevails. Thus the mean vertical velocities can be biased downwards at the lower edge, and the mean vertical velocities can be biased upwards at the upper edge, while at the main central region the obtained mean vertical velocities are consistent with expected upward values of mean vertical winds after considering ice particle sedimentation. © 2019 Author(s). This work is distributed under the Creative Commons Attribution 4.0 License.
语种	英语
scopus关键词	Doppler radar; mesosphere; seasonal variation; spatiotemporal analysis; three-dimensional modeling; zonal wind; Norway
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/144510
作者单位	Leibniz Institute of Atmospheric Physics, University of Rostock, Kühlungsborn, Germany; Abastumani Astrophysical Observatory, Ilia State University, Abastumani, Georgia
推荐引用方式 GB/T 7714	Gudadze N.,Stober G.,Chau J.L.. Can VHF radars at polar latitudes measure mean vertical winds in the presence of PMSE?[J],2019,19(7).
APA	Gudadze N.,Stober G.,&Chau J.L..(2019).Can VHF radars at polar latitudes measure mean vertical winds in the presence of PMSE?.Atmospheric Chemistry and Physics,19(7).
MLA	Gudadze N.,et al."Can VHF radars at polar latitudes measure mean vertical winds in the presence of PMSE?".Atmospheric Chemistry and Physics 19.7(2019).