Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-17-0263.1 |
Dynamics of Extreme Stratospheric Negative Heat Flux Events in an Idealized Model | |
Dunn-Sigouin, Etienne1,2; Shaw, Tiffany3 | |
2018-10-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES |
ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2018 |
卷号 | 75期号:10页码:3521-3540 |
文章类型 | Article |
语种 | 英语 |
国家 | Norway; USA |
英文摘要 | Recent work has shown that extreme stratospheric wave-1 negative heat flux events couple with the troposphere via an anomalous wave-1 signal. Here, a dry dynamical core model is used to investigate the dynamical mechanisms underlying the events. Ensemble spectral nudging experiments are used to isolate the role of specific dynamical components: 1) the wave-1 precursor, 2) the stratospheric zonal-mean flow, and 3) the higher-order wavenumbers. The negative events are partially reproduced when nudging the wave-1 precursor and the zonal-mean flow whereas they are not reproduced when nudging either separately. Nudging the wave-1 precursor and the higher-order wavenumbers reproduces the events, including the evolution of the stratospheric zonal-mean flow. Mechanism denial experiments, whereby one component is fixed to the climatology and others are nudged to the event evolution, suggest higher-order wavenumbers play a role by modifying the zonal-mean flow and through stratospheric wave-wave interaction. Nudging all tropospheric wave precursors (wave-1 and higher-order wavenumbers) confirms they are the source of the stratospheric waves. Nudging all stratospheric waves reproduces the tropospheric wave-1 signal. Taken together, the experiments suggest the events are consistent with downward wave propagation from the stratosphere to the troposphere and highlight the key role of higher-order wavenumbers. |
英文关键词 | Planetary waves Stratosphere-troposphere coupling Primitive equations model Climate variability |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000444536400001 |
WOS关键词 | PLANETARY-WAVES ; NORTHERN-HEMISPHERE ; SUDDEN WARMINGS ; WINTER STRATOSPHERE ; SURFACE WEATHER ; LIFE-CYCLE ; TROPOSPHERE ; OSCILLATION ; VARIABILITY ; CIRCULATION |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/29331 |
专题 | 地球科学 |
作者单位 | 1.Univ Bergen, Geophys Inst, Bergen, Norway; 2.Bjerknes Ctr Climate Res, Bergen, Norway; 3.Univ Chicago, Dept Geophys Sci, Chicago, IL 60637 USA |
推荐引用方式 GB/T 7714 | Dunn-Sigouin, Etienne,Shaw, Tiffany. Dynamics of Extreme Stratospheric Negative Heat Flux Events in an Idealized Model[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2018,75(10):3521-3540. |
APA | Dunn-Sigouin, Etienne,&Shaw, Tiffany.(2018).Dynamics of Extreme Stratospheric Negative Heat Flux Events in an Idealized Model.JOURNAL OF THE ATMOSPHERIC SCIENCES,75(10),3521-3540. |
MLA | Dunn-Sigouin, Etienne,et al."Dynamics of Extreme Stratospheric Negative Heat Flux Events in an Idealized Model".JOURNAL OF THE ATMOSPHERIC SCIENCES 75.10(2018):3521-3540. |
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