| DOI: | 10.1002/2014MS000395
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| Scopus记录号: | 2-s2.0-85027937756
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| 论文题名: | Tracking gravity waves in moist baroclinic jet-front systems |
| 作者: | Wei J; , Zhang F
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| 刊名: | Journal of Advances in Modeling Earth Systems
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| ISSN: | 19422466
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| 出版年: | 2015
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| 卷: | 7, 期:1 | | 起始页码: | 67
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| 结束页码: | 91
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| 语种: | 英语
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| 英文关键词: | Budget control
; Ray tracing
; Refraction
; Thermodynamics
; Troposphere
; Wind effects
; Convective instabilities
; Convectively generated gravity waves
; Jet fronts
; Latent heat release
; Mesoscale process
; Propagating characteristics
; Source mechanisms
; Thermodynamics effects
; Gravity waves
; cold front
; experimental study
; frontogenesis
; gravity wave
; heating
; mesoscale meteorology
; refraction
; stratosphere
; thermodynamics
; tropopause
; troposphere
; wave propagation
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| 英文摘要: | A series of four-dimensional ray-tracing experiments are performed to investigate the propagating wave characteristics, source mechanisms, and wave number vector refraction budget of six groups of lower-stratospheric gravity waves in the moist baroclinic jet-front systems with varying degree of convective instability. On one hand, the resemblance of ray trajectories and propagating characteristics between gravity waves in the dry experiment versus those in the experiment with weak diabatic heating demonstrates the limited role of moist convection in modifying those wave modes that are dominated by dry dynamics, including both the short-scale northward-propagating mode and the intermediate-scale northward-propagating mode in the jet exit region (likely induced by upper-level jet imbalance and/or tropospheric frontogenesis), the intermediate-scale eastward-propagating mode from the jet exit region in the ridge down to the jet entrance region in the trough (likely induced by upper-level jet imbalance), and the short-scale southward-propagating mode located far to the south of the jet right above the surface cold front (likely induced by tropospheric frontogenesis). On the other hand, comparisons of the gravity waves in the two aforementioned experiments through the ray tracing analysis further demonstrate that moist convection may force new wave modes, modify existing dry wave modes through latent heat release, or modify the new/existing waves through modification of large-scale flow. Convectively generated gravity waves could propagate both upstream and downstream of the latent heating. Lastly, it is indicated in the budget analysis of wave number vector refraction equations that the wind effect on changing the characteristics of propagating gravity waves generally dominates over the thermodynamics effect, and that the thermodynamics effect may counteract, enhance, or even take over the effect of background wind for those wave packets crossing the tropopause or frontal systems. © 2014. The Authors. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/76066
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| Appears in Collections: | 影响、适应和脆弱性
气候变化与战略
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作者单位: | Department of Meteorology, Pennsylvania State University, University Park, PA, United States
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| Recommended Citation: | |
Wei J,, Zhang F. Tracking gravity waves in moist baroclinic jet-front systems[J]. Journal of Advances in Modeling Earth Systems,2015-01-01,7(1)
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