球面上波均流相互作用激发的混合罗斯比重力波

IF 3 3区 地球科学 Q2 METEOROLOGY & ATMOSPHERIC SCIENCES
Sándor István Mahó, Sergiy Vasylkevych, Nedjeljka Žagar
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引用次数: 0

摘要

赤道混合罗斯比重力波(MRGW)是热带变率的一个重要因素。它的激发机制能否解释对流层中同步尺度上观测到的 MRGW 变率峰值,仍然是个未知数。本研究利用 TIGAR 模型研究了作为 MRGW 生成过程的波-均方流相互作用,该模型采用 Hough 谐波作为球面上频谱扩展的基础,从而将 MRGW 表示为预报变量。理想化的数值模拟揭示了对称热带热源和不对称副热带带状喷流所产生的波浪之间的相互作用是 MRGW 的激发机制。被激发的 MRGW 具有与热带对流层中观测到的 MRGW 相似的方差谱。罗斯比-重力混合能谱在带状波数处有一个最大值-5,在非对称强迫的情况下也会产生大尺度的 MRGW。与波-平均流相互作用相比,波-波相互作用对 MRGW 增长的影响似乎不大。应用ERA5的带状平均风剖面图再次证实了带状平均流不对称的重要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Excitation of mixed Rossby–gravity waves by wave–mean flow interactions on the sphere
The equatorial mixed Rossby–gravity wave (MRGW) is an important contributor to tropical variability. Its excitation mechanism capable of explaining the observed MRGW variance peak at synoptic scales in the troposphere remains elusive. This study investigates wave–mean flow interactions as a generation process for the MRGWs using the TIGAR model, which employs Hough harmonics as the basis of spectral expansion on the sphere, thereby representing MRGWs as prognostic variables. Idealized numerical simulations reveal the interactions between waves emanating from a symmetric tropical heat source and an asymmetric subtropical zonal jet as an excitation mechanism for the MRGWs. The excited MRGWs have variance spectra resembling the observed MRGWs in the tropical troposphere. The mixed Rossby–gravity energy spectrum has a maximum at zonal wavenumbers –5 also in the case of an asymmetric forcing that generates MRGWs across large scales. Effects of wave–wave interactions appear of little importance for the MRGW growth compared with wave–mean flow interactions. Application of the zonal‐mean zonal wind profiles from ERA5 reaffirms the importance of the asymmetry of the zonal mean flow.
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来源期刊
CiteScore
16.80
自引率
4.50%
发文量
163
审稿时长
3-8 weeks
期刊介绍: The Quarterly Journal of the Royal Meteorological Society is a journal published by the Royal Meteorological Society. It aims to communicate and document new research in the atmospheric sciences and related fields. The journal is considered one of the leading publications in meteorology worldwide. It accepts articles, comprehensive review articles, and comments on published papers. It is published eight times a year, with additional special issues. The Quarterly Journal has a wide readership of scientists in the atmospheric and related fields. It is indexed and abstracted in various databases, including Advanced Polymers Abstracts, Agricultural Engineering Abstracts, CAB Abstracts, CABDirect, COMPENDEX, CSA Civil Engineering Abstracts, Earthquake Engineering Abstracts, Engineered Materials Abstracts, Science Citation Index, SCOPUS, Web of Science, and more.
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