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DOI10.1029/2018JD028359
Role of Wave-Induced Diffusion and Energy Flux in the Vertical Transport of Atmospheric Constituents in the Mesopause Region
Gardner, Chester S.
2018-06-27
发表期刊JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
ISSN2169-897X
EISSN2169-8996
出版年2018
卷号123期号:12页码:6581-6604
文章类型Article
语种英语
国家USA
英文摘要

Vertical constituent transport is characterized by solving the continuity equation for a minor species in the presence of waves, turbulence, molecular diffusion, and chemical sources and sinks. Random vertical displacement fluctuations induced by waves contribute to vertical mixing of the atmosphere similar to turbulence. The effective wave diffusivity is proportional to the sensible heat flux. Because waves induce pressure fluctuations, diffusivity can also be expressed in terms of the wave energy and enthalpy fluxes. Waves induce strong down gradient mixing in regions where dissipation is significant and weak up gradient mixing where dissipation is negligible. At midlatitudes wave diffusivity is maximum in the upper mesosphere near 88km where the annual mean is 130m(2)/s. Waves also enhance molecular diffusion of reactive species in regions of slow chemical production and reduce eddy mixing in regions of fast chemical production. The enhancement/reduction factor is proportional to the perturbed lapse rate variance and varies between 15 and 45% at mesopause heights. Wave-induced chemical transport is related to the chemical production/loss rates and temperature fluctuation variance. The vertical transport of atomic oxygen, meteoric Fe, and meteoric Na is assessed. Analytical predictions compare favorably with models of the chemical loss of O and the meteoric influxes of Fe and Na and with lidar measurements of the vertical fluxes of Fe and Na. Predicted seasonal variations of wave diffusivity at 97.5km compare favorably with the total diffusivity inferred from satellite observations of neutral density and the O/N-2 ratio in the thermosphere.


英文关键词mesospheric dynamics constituent transport waves turbulence
领域气候变化
收录类别SCI-E
WOS记录号WOS:000439508000016
WOS关键词SEASONAL-VARIATION ; MIDDLE ATMOSPHERE ; EDDY DIFFUSIVITY ; GRAVITY-WAVES ; COSMIC DUST ; CHEMICAL-TRANSPORT ; LOWER THERMOSPHERE ; NA LIDAR ; MESOSPHERE ; TURBULENCE
WOS类目Meteorology & Atmospheric Sciences
WOS研究方向Meteorology & Atmospheric Sciences
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/33763
专题气候变化
作者单位Univ Illinois, Dept Elect & Comp Engn, Urbana, IL 61801 USA
推荐引用方式
GB/T 7714
Gardner, Chester S.. Role of Wave-Induced Diffusion and Energy Flux in the Vertical Transport of Atmospheric Constituents in the Mesopause Region[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2018,123(12):6581-6604.
APA Gardner, Chester S..(2018).Role of Wave-Induced Diffusion and Energy Flux in the Vertical Transport of Atmospheric Constituents in the Mesopause Region.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,123(12),6581-6604.
MLA Gardner, Chester S.."Role of Wave-Induced Diffusion and Energy Flux in the Vertical Transport of Atmospheric Constituents in the Mesopause Region".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 123.12(2018):6581-6604.
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