Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-17-0350.1 |
Nondissipative and Dissipative Momentum Deposition by Mountain Wave Events in Sheared Environments | |
Kruse, Christopher G.; Smith, Ronald B. | |
2018-08-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES |
ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2018 |
卷号 | 75期号:8页码:2721-2740 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Mountain waves (MWs) are generated during episodic cross-barrier flow over broad-spectrum terrain. However, most MW drag parameterizations neglect transient, broad-spectrum dynamics. Here, the influences of these dynamics on both nondissipative and dissipative momentum deposition by MW events are quantified in a 2D, horizontally periodic idealized framework. The influences of the MW spectrum, vertical wind shear, and forcing duration are investigated. MW events are studied using three numerical modelsthe nonlinear, transient WRF Model; a linear, quasi-transient Fourier-ray model; and an optimally tuned Lindzen-type saturation parameterizationallowing quantification of total, nondissipative, and dissipative MW-induced decelerations, respectively. Additionally, a pseudomomentum diagnostic is used to estimate nondissipative decelerations within the WRF solutions. For broad-spectrum MWs, vertical dispersion controls spectrum evolution aloft. Short MWs propagate upward quickly and break first at the highest altitudes. Subsequently, the arrival of additional longer MWs allows breaking at lower altitudes because of their greater contribution to u variance. As a result, minimum breaking levels descend with time and event duration. In zero- and positive-shear environments, this descent is not smooth but proceeds downward in steps as a result of vertically recurring steepening levels. Nondissipative decelerations are nonnegligible and influence an MW's approach to breaking, but breaking and dissipative decelerations quickly develop and dominate the subsequent evolution. Comparison of the three model solutions suggests that the conventional instant propagation and monochromatic parameterization assumptions lead to too much MW drag at too low an altitude. |
英文关键词 | Momentum Mountain waves Wind shear Middle atmosphere Stratosphere-troposphere coupling Parameterization |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000439918500001 |
WOS关键词 | OROGRAPHIC-DRAG PARAMETRIZATION ; ATMOSPHERIC GRAVITY-WAVES ; GENERAL-CIRCULATION ; BREAKING ; PARAMETERIZATION ; MESOSPHERE ; TRANSPORT ; DYNAMICS ; CLIMATE ; MODELS |
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/29647 |
专题 | 地球科学 |
作者单位 | Yale Univ, New Haven, CT 06520 USA |
推荐引用方式 GB/T 7714 | Kruse, Christopher G.,Smith, Ronald B.. Nondissipative and Dissipative Momentum Deposition by Mountain Wave Events in Sheared Environments[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2018,75(8):2721-2740. |
APA | Kruse, Christopher G.,&Smith, Ronald B..(2018).Nondissipative and Dissipative Momentum Deposition by Mountain Wave Events in Sheared Environments.JOURNAL OF THE ATMOSPHERIC SCIENCES,75(8),2721-2740. |
MLA | Kruse, Christopher G.,et al."Nondissipative and Dissipative Momentum Deposition by Mountain Wave Events in Sheared Environments".JOURNAL OF THE ATMOSPHERIC SCIENCES 75.8(2018):2721-2740. |
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