Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-18-0197.1 |
A Reduced-Order Representation of the Madden-Julian Oscillation Based on Reanalyzed Normal Mode Coherences | |
Kitsios, Vassili1; 39;Kane, Terence J.2 | |
2019-08-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES
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ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2019 |
卷号 | 76期号:8页码:2463-2480 |
文章类型 | Article |
语种 | 英语 |
国家 | Australia; Germany |
英文摘要 | The Madden-Julian oscillation (MJO) is presented as a series of interacting Rossby and inertial gravity waves of varying vertical scales and meridional extents. These components are isolated by decomposing reanalysis fields into a set of normal mode functions (NMF), which are orthogonal eigenvectors of the linearized primitive equations on a sphere. The NMFs that demonstrate spatial properties compatible with the MJO are inertial gravity waves of zonal wavenumber k = 1 and the lowest meridional index n = 0, and Rossby waves with (k, n) = (1, 1). For these horizontal scales, there are multiple small vertical-scale baroclinic modes that have temporal properties indicative of the MJO. On the basis of one such eastward-propagating inertial gravity wave (i.e., a Kelvin wave), composite averages of the Japanese 55-year Reanalysis demonstrate an eastward propagation of the velocity potential, and oscillation of outgoing longwave radiation and precipitation fields over the Maritime Continent, with an MJO-appropriate temporal period. A cross-spectral analysis indicates that only the MJO time scale is coherent between this Kelvin wave and the more energetic modes. Four mode clusters are identified: Kelvin waves of correct phase period and direction, Rossby waves of correct phase period, energetic Kelvin waves of larger vertical scales and meridional extents extending into the extratropics, and energetic Rossby waves of spatial scales similar to that of the energetic Kelvin waves. We propose that within this normal mode framework, nonlinear interactions between the aforementioned mode groups are required to produce an energetic MJO propagating eastward with an intraseasonal phase period. By virtue of the selected mode groups, this theory encompasses both multiscale and tropical-extratropical interactions. |
英文关键词 | Madden-Julian oscillation Reanalysis data Interannual variability |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000477019800002 |
WOS关键词 | TROPICAL-EXTRATROPICAL INTERACTIONS ; INTRASEASONAL OSCILLATIONS ; SCALE CIRCULATION ; WAVE-CISK ; ATMOSPHERE ; VARIABILITY ; CONVECTION ; DYNAMICS ; SKELETON ; ENERGY |
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/185756 |
专题 | 地球科学 |
作者单位 | 1.CSIRO, Oceans & Atmosphere, Hobart, Tas, Australia; 2.Univ Hamburg, Meteorol Inst, Hamburg, Germany |
推荐引用方式 GB/T 7714 | Kitsios, Vassili,39;Kane, Terence J.. A Reduced-Order Representation of the Madden-Julian Oscillation Based on Reanalyzed Normal Mode Coherences[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2019,76(8):2463-2480. |
APA | Kitsios, Vassili,&39;Kane, Terence J..(2019).A Reduced-Order Representation of the Madden-Julian Oscillation Based on Reanalyzed Normal Mode Coherences.JOURNAL OF THE ATMOSPHERIC SCIENCES,76(8),2463-2480. |
MLA | Kitsios, Vassili,et al."A Reduced-Order Representation of the Madden-Julian Oscillation Based on Reanalyzed Normal Mode Coherences".JOURNAL OF THE ATMOSPHERIC SCIENCES 76.8(2019):2463-2480. |
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