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| DOI | 10.1175/JCLI-D-20-0373.1 |
| The interannual variability of the tropical divergence tilt and its connection with the extratropical circulation | |
| Zurita-Gotor P. | |
| 发表日期 | 2021 |
| ISSN | 0894-8755 |
| 起始页码 | 259 |
| 结束页码 | 275 |
| 卷号 | 34期号:1 |
| 英文摘要 | Previous theoretical work has suggested that the strength of the divergent eddy momentum flux in the deep tropics, due to correlations between rotational zonal velocities and divergent meridional velocities, increases with the meridional tilt of the large-scale divergence field. To test that idea, this work investigates the interannual variability of the divergent eddy momentum flux in reanalysis data. Consistent with the theory, it is found that the eddy momentum flux variability is driven by two main parameters: the amplitude of the tropical stationary wave and the tilt of the divergence field. Together, these two parameters account for 80% (90%) of the interannual eddy momentum flux variance during boreal (austral) winter. The interannual variability of these parameters is governed by the internal atmospheric dynamics. During boreal winter, interannual changes in MJO variability explain nearly half of the interannual variance in the stationary wave amplitude, depending on whether on average MJO anomalies interfere constructively or destructively with the stationary wave. The interannual variability of the divergence phase tilt is modulated by tropical-extratropical interactions in the Pacific. The tilt increases during the negative phase of the west Pacific Oscillation associated with a dipole of upper-level divergence (convergence) on the northern (southern) side of the Pacific jet exit region. © 2020 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses). |
| 英文关键词 | Climatology; Tropics; Atmospheric dynamics; Divergence field; Eddy momentum flux; Extratropical circulation; Interannual variability; Meridional velocities; Stationary waves; Tropical-extratropical interactions; Momentum; annual variation; atmospheric circulation; geostrophic flow; jet; large eddy simulation; meridional circulation; planetary wave; zonal wind; Pacific Ocean; Pacific Ocean (North) |
| 语种 | 英语 |
| 来源期刊 | Journal of Climate
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/170984 |
| 作者单位 | Instituto de Geociencia, Universidad Complutense Madrid-Consejo Superior de Investigaciones Científicas, Madrid, Spain |
| 推荐引用方式 GB/T 7714 | Zurita-Gotor P.. The interannual variability of the tropical divergence tilt and its connection with the extratropical circulation[J],2021,34(1). |
| APA | Zurita-Gotor P..(2021).The interannual variability of the tropical divergence tilt and its connection with the extratropical circulation.Journal of Climate,34(1). |
| MLA | Zurita-Gotor P.."The interannual variability of the tropical divergence tilt and its connection with the extratropical circulation".Journal of Climate 34.1(2021). |
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