globalchange  > 气候减缓与适应
DOI: 10.1029/2017JD027386
Scopus记录号: 2-s2.0-85052199709
论文题名:
Lidar Observations of Stratospheric Gravity Waves From 2011 to 2015 at McMurdo (77.84°S, 166.69°E), Antarctica: 2. Potential Energy Densities, Lognormal Distributions, and Seasonal Variations
作者: Chu X.; Zhao J.; Lu X.; Harvey V.L.; Jones R.M.; Becker E.; Chen C.; Fong W.; Yu Z.; Roberts B.R.; Dörnbrack A.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期:15
起始页码: 7910
结束页码: 7934
语种: 英语
英文关键词: Antarctic lidar observations ; lognormal distributions ; polar vortex ; potential energy density ; stratospheric gravity waves ; wave dissipation
英文摘要: Five years of Fe Boltzmann lidar's Rayleigh temperature data from 2011 to 2015 at McMurdo are used to characterize gravity wave potential energy mass density (Epm), potential energy volume density (Epv), vertical wave number spectra, and static stability N2 in the stratosphere 30–50 km. Epm (Epv) profiles increase (decrease) with altitude, and the scale heights of Epv indicate stronger wave dissipation in winter than in summer. Altitude mean (Formula presented.) and (Formula presented.) obey lognormal distributions and possess narrowly clustered small values in summer but widely spread large values in winter. (Formula presented.) and (Formula presented.) vary significantly from observation to observation but exhibit repeated seasonal patterns with summer minima and winter maxima. The winter maxima in 2012 and 2015 are higher than in other years, indicating interannual variations. Altitude mean (Formula presented.) varies by ~30–40% from the midwinter maxima to minima around October and exhibits a nearly bimodal distribution. Monthly mean vertical wave number power spectral density for vertical wavelengths of 5–20 km increases from summer to winter. Using Modern Era Retrospective Analysis for Research and Applications version 2 data, we find that large values of (Formula presented.) during wintertime occur when McMurdo is well inside the polar vortex. Monthly mean (Formula presented.) are anticorrelated with wind rotation angles but positively correlated with wind speeds at 3 and 30 km. Corresponding correlation coefficients are −0.62, +0.87, and +0.80, respectively. Results indicate that the summer-winter asymmetry of (Formula presented.) is mainly caused by critical level filtering that dissipates most gravity waves in summer. (Formula presented.) variations in winter are mainly due to variations of gravity wave generation in the troposphere and stratosphere and Doppler shifting by the mean stratospheric winds. ©2018. The Authors.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113271
Appears in Collections:气候减缓与适应

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作者单位: Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO, United States; Department of Aerospace Engineering Sciences, University of Colorado Boulder, Boulder, CO, United States; Department of Physics and Astronomy, Clemson University, Clemson, SC, United States; Laboratory for Atmospheric and Space Physics, University of Colorado Boulder, Boulder, CO, United States; Leibniz Institute of Atmospheric Physics, University of Rostock, Kühlungsborn, Germany; DLR Oberpfaffenhofen, Institute für Physik der Atmosphäre, Oberpfaffenhofen, Germany

Recommended Citation:
Chu X.,Zhao J.,Lu X.,et al. Lidar Observations of Stratospheric Gravity Waves From 2011 to 2015 at McMurdo (77.84°S, 166.69°E), Antarctica: 2. Potential Energy Densities, Lognormal Distributions, and Seasonal Variations[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(15)
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