Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JCLI-D-16-0595.1 |
Oceanic Impetus for Convective Onset of the Madden-Julian Oscillation in the Western Indian Ocean | |
Rydbeck, Adam V.1; Jensen, Tommy G.2 | |
2017-06-01 | |
发表期刊 | JOURNAL OF CLIMATE
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ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2017 |
卷号 | 30期号:11 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | A theory for intraseasonal atmosphere-ocean-atmosphere feedback is supported whereby oceanic equatorial Rossby waves are partly forced in the eastern Indian Ocean by the Madden-Julian oscillation (MJO), reemerge in the western Indian Ocean similar to 70 days later, and force large-scale convergence in the atmospheric boundary layer that precedes MJO deep convection. Downwelling equatorial Rossby waves permit high sea surface temperature (SST) and enhance meridional and zonal SST gradients that generate convergent circulations in the atmospheric boundary layer. The magnitude of the SST and SST gradient increases are 0.25 degrees C and 1.5 degrees CMm(-1) (1 megameter is equal to 1000 km), respectively. The atmospheric circulations driven by the SST gradient are estimated to be responsible for up to 45% of the intraseasonal boundary layer convergence observed in the western Indian Ocean. The SST-induced boundary layer convergence maximizes 3-4 days prior to the convective maximum and is hypothesized to serve as a trigger for MJO deep convection. Boundary layer convergence is shown to further augment deep convection by locally increasing boundary layer moisture. Warm SST anomalies facilitated by downwelling equatorial Rossby waves are also associated with increased surface latent heat fluxes that occur after MJO convective onset. Finally, generation of the most robust downwelling equatorial Rossby waves in the western Indian Ocean is shown to have a distinct seasonal distribution. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000401007500021 |
WOS关键词 | SEA-SURFACE TEMPERATURE ; CINDY/DYNAMO FIELD CAMPAIGN ; TOGA COARE ; KELVIN WAVES ; ROSSBY WAVES ; INTRASEASONAL OSCILLATIONS ; VERTICAL STRUCTURE ; TROPICAL OCEANS ; LIFE-CYCLE ; PACIFIC |
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/19728 |
专题 | 气候变化 |
作者单位 | 1.Amer Soc Engn Educ, Washington, DC 20036 USA; 2.Naval Res Lab, Div Oceanog, Stennis Space Ctr, MS USA |
推荐引用方式 GB/T 7714 | Rydbeck, Adam V.,Jensen, Tommy G.. Oceanic Impetus for Convective Onset of the Madden-Julian Oscillation in the Western Indian Ocean[J]. JOURNAL OF CLIMATE,2017,30(11). |
APA | Rydbeck, Adam V.,&Jensen, Tommy G..(2017).Oceanic Impetus for Convective Onset of the Madden-Julian Oscillation in the Western Indian Ocean.JOURNAL OF CLIMATE,30(11). |
MLA | Rydbeck, Adam V.,et al."Oceanic Impetus for Convective Onset of the Madden-Julian Oscillation in the Western Indian Ocean".JOURNAL OF CLIMATE 30.11(2017). |
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