波共振诱导的罗斯-重力混合波在温带强迫下的增强

IF 4.6 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Geophysical Research Letters Pub Date : 2024-12-23 DOI:10.1029/2024GL112579

Mehak Mehak, E. Suhas

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引用次数: 0

摘要

已知温带扰动会影响西半球混合罗斯-重力波（MRGW）的发生和增强。该研究为波共振（WR）理论提供了观测证据，该理论试图通过热带外强迫解释MRGW的增强。波数-频率共谱分析和利用再分析资料估计的MRGW的大量增长表明，以涡旋动量通量辐合形式表现的温带强迫可以产生涡旋动能（EKE），并通过WR机制帮助北方冬季MRGW的增强。然而，在北方夏季，由于温带强迫倾向于抑制MRGW， WR机制不成立。分析还表明，北半球冬季多普勒东移的多普勒东传播的多普勒偏强并不是由温带强迫维持的，这是本研究的另一个亮点。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Wave Resonance Induced Intensification of Mixed Rossby-Gravity Waves by Extratropical Forcing

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Wave Resonance Induced Intensification of Mixed Rossby-Gravity Waves by Extratropical Forcing

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.

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来源期刊

Geophysical Research Letters 地学-地球科学综合

CiteScore

9.00

自引率

9.60%

发文量

1588

审稿时长

2.2 months

期刊介绍： Geophysical Research Letters (GRL) publishes high-impact, innovative, and timely research on major scientific advances in all the major geoscience disciplines. Papers are communications-length articles and should have broad and immediate implications in their discipline or across the geosciences. GRLmaintains the fastest turn-around of all high-impact publications in the geosciences and works closely with authors to ensure broad visibility of top papers.