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Wave Resonance Induced Intensification of Mixed Rossby-Gravity Waves by Extratropical Forcing
Geophysical Research Letters ( IF 4.6 ) Pub Date : 2024-12-23 , DOI: 10.1029/2024gl112579
Mehak Mehak, E. Suhas

Extratropical disturbances are known to impact the genesis and intensification of Mixed Rossby-Gravity waves (MRGW) in the Western Hemisphere (WH). The study provides observational evidence supporting the wave resonance (WR) theory which attempts to explain the intensification of MRGW by extratropical forcing. Wavenumber-frequency cospectral analysis and a bulk measure of growth of MRGW estimated using reanalysis data reveal that the extratropical forcing manifested in the form of eddy momentum flux convergence can create eddy kinetic energy (EKE) and aid the intensification of MRGW via WR mechanism during boreal winter season. However, the WR mechanism does not hold during boreal summer season as the extratropical forcing tends to dampen the MRGW. The analysis also reveals that the Doppler-shifted eastward propagating MRGW in the WH during boreal winter season are not maintained by extratropical forcing, marking another highlight of this study.

中文翻译:


波共振通过温带强迫诱导的 Rossby-Gravity 混合波的增强



已知温带扰动会影响西半球 (WH) 混合罗斯比引力波 (MRGW) 的起源和增强。该研究提供了支持波共振 (WR) 理论的观测证据,该理论试图解释温带强迫导致 MRGW 的增强。波数-频率共谱分析和使用再分析数据估计的 MRGW 增长的批量测量表明,以涡流动量通量收敛形式表现出的温带强迫可以产生涡动能 (EKE) 并有助于在北方冬季通过 WR 机制增强 MRGW。然而,WR 机制在北方夏季并不成立,因为温带强迫往往会抑制 MRGW。分析还表明,在北方冬季,WH 中多普勒频移东移的 MRGW 没有受到温带强迫的维持,这是本研究的另一个亮点。
更新日期:2024-12-23
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