An enhanced moisture convergence - Evaporation feedback mechanism for MJO air-sea interaction
文献类型：期刊论文
| 作者 | Marshall, AG ; Alves, O ; Hendon, HH |
| 刊名 | JOURNAL OF THE ATMOSPHERIC SCIENCES
 |
| 出版日期 | 2008 |
| 卷号 | 65期号:3页码:970-986 |
| ISSN号 | 0022-4928 |
| 通讯作者 | andrew.marshall@metoffice.gov.uk |
| 中文摘要 | Simulations using an atmospheric model forced with observed SST climatology and the same atmospheric model coupled to a slab-ocean model are used to investigate the role of air-sea interaction on the dynamics of the MJO. Slab-ocean coupling improved the MJO in Australia's Bureau of Meteorology atmospheric model over the Indo-Pacific warm pool by reducing its period from 70-100 to 45-70 days, thereby showing better agreement with the 30-80-day observed oscillation. Air-sea coupling improves the MJO by increasing the moisture flux in the lower troposphere prior to the passage of active convection, which acts to promote convection and precipitation on the eastern flank of the main convective center. This process is triggered by an increase in surface evaporation over positive SST anomalies ahead of the MJO convection, which are driven by the enhanced shortwave radiation in the region of suppressed convection. This in turn generates enhanced convergence into the region, which supports evaporation-wind feedback in the presence of weak background westerly winds. A subsequent increase in low-level moisture convergence acts to further moisten the lower troposphere in advance of large-scale convection in a region of reduced atmospheric pressure. This destabilizing mechanism is referred to as enhanced moisture convergaence-evaporation feedback (EMCEF) and is utilized to understand the role of air-sea coupling on the observed MJO. The EMCEF mechanism also reconciles traditionally opposing ideas on the roles of frictional wave-conditional instability of the second kind (CISK) and wind-evaporation feedback. These results support the idea that the MJO is primarily an atmospheric phenomenon, with air-sea interaction improving upon, but not critical for, its existence in the model. |
| 学科主题 | Meteorology & Atmospheric Sciences |
| 收录类别 | SCI |
| 原文出处 | AMER METEOROLOGICAL SOC |
| 公开日期 | 2011-07-14 |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/8435]  |
| 专题 | 南海海洋研究所_海洋科技动态信息-印太暖池系统研究 |
| 推荐引用方式 GB/T 7714 | Marshall, AG,Alves, O,Hendon, HH. An enhanced moisture convergence - Evaporation feedback mechanism for MJO air-sea interaction[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2008,65(3):970-986. |
| APA | Marshall, AG,Alves, O,&Hendon, HH.(2008).An enhanced moisture convergence - Evaporation feedback mechanism for MJO air-sea interaction.JOURNAL OF THE ATMOSPHERIC SCIENCES,65(3),970-986. |
| MLA | Marshall, AG,et al."An enhanced moisture convergence - Evaporation feedback mechanism for MJO air-sea interaction".JOURNAL OF THE ATMOSPHERIC SCIENCES 65.3(2008):970-986. |
入库方式： OAI收割
来源：南海海洋研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。