Observed Responses of Gravity Wave Momentum Fluxes to the Madden‒Julian Oscillation Around the Extratropical Mesopause Using Mohe Meteor Radar Observations

IF 3.8 2区地球科学 Q2 METEOROLOGY & ATMOSPHERIC SCIENCES

Journal of Geophysical Research: Atmospheres Pub Date : 2024-11-06 DOI:10.1029/2024JD041447

Xu Zhou, Libo Liu, Xinan Yue, Guiwan Chen, Xian Lu

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Abstract

The 12-year continuous observation of gravity wave momentum fluxes (GWMFs) estimated by the Mohe meteor radar (53.5°N, 122.3°E) revealed prominent intraseasonal variability around the extratropical mesopause (82–94 km) during boreal winters. Composite analysis of the December‒January‒February (DJF) season according to the Madden‒Julian Oscillation (MJO) phases revealed that the zonal GWMFs notably increased in MJO Phase 4 (P4) by ∼2–4 m²/s², and a Monte Carlo test was designed to examine the statistical significance. The response in zonal winds lags behind the GWMF response by two MJO phases (i.e., 1/2π), indicating a “force‒response” interaction between them. Additionally, time-lagged composites revealed that strengthened westward GWMFs occurred ∼25–35 days after MJO P4, coincident with the MJO impact on the zonal winds in the stratosphere. The analysis results also suggested that the mechanism of MJO by which the MJO influences the stratospheric circulation might involve poleward propagating effects of stationary planetary waves with zonal wavenumber one. This work emphasizes the importance of GW intraseasonal variability, which impacts tropical sources from the troposphere to the extratropical mesopause.

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利用 Mohe 流星雷达观测数据观测到的重力波动量通量对热带外中层顶附近马登-朱利安涛动的响应

漠河流星雷达（北纬 53.5°，东经 122.3°）对重力波动量通量（GWMFs）的 12 年连续观测表明，在北方冬季，外热带中顶点（82-94 公里）附近的季内变化非常明显。根据马登-朱利安涛动（MJO）阶段对 12 月-1 月-2 月（DJF）季节进行的综合分析表明，在 MJO 阶段 4（P4），地带性全球风速明显增加，增加幅度为 2-4 m2/s2。带状风的响应比 GWMF 的响应滞后两个 MJO 阶段（即 1/2π），表明它们之间存在 "力-响应 "相互作用。此外，时滞复合分析表明，在 MJO P4 之后 25-35 天，西向 GWMFs 出现增强，这与 MJO 对平流层地带风的影响相吻合。分析结果还表明，MJO对平流层环流的影响机制可能涉及带状波数为1的静止行星波的极向传播效应。这项工作强调了全球大气环流季节内变化的重要性，它影响着从对流层到热带外中层的热带源。

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来源期刊

Journal of Geophysical Research: Atmospheres Earth and Planetary Sciences-Geophysics

CiteScore

7.30

自引率

11.40%

发文量

684

期刊介绍： JGR: Atmospheres publishes articles that advance and improve understanding of atmospheric properties and processes, including the interaction of the atmosphere with other components of the Earth system.