• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Climate >Reexamining the MJO Moisture Mode Theories with Normalized Phase Evolutions
【24h】

Reexamining the MJO Moisture Mode Theories with Normalized Phase Evolutions

机译：通过标准化相位演进的MJO水分模式理论重新审视MJO水分模式理论

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A normalization method is applied to MJO-scale precipitation and column integrated moist static energy (MSE) anomalies to clearly illustrate the phase evolution of MJO. It is found that the MJO peak phases do not move smoothly, rather they jump from the original convective region to a new location to its east. Such a discontinuous phase evolution is related to the emerging and developing of new congestus convection to the east of the preexisting deep convection. While the characteristic length scale of the phase jump depends on a Kelvin wave response, the associated time scale represents the establishment of an unstable stratification in the front due to boundary layer moistening. The combined effect of the aforementioned characteristic length and time scales determines the observed slow eastward phase speed. Such a phase evolution characteristic seems to support the moisture mode theory of the second type that emphasizes the boundary layer moisture asymmetry, because the moisture mode theory of the first type, which emphasizes the moisture or MSE tendency asymmetry, might favor more "smooth" phase propagation. A longitudinal-location-dependent premoistening mechanism is found based on moisture budget analysis. For the MJO in the eastern Indian Ocean, the premoistening in front of the MJO convection arises from vertical advection, whereas for the MJO over the western Pacific Ocean, it is attributed to the surface evaporating process.
机译：将归一化方法应用于MJO级沉淀和柱集成湿静电能量（MSE）异常，以清楚地说明MJO的相位演化。结果发现MJO峰阶段不会顺利移动，而是从原始的对流区域跳到其东部的新位置。这种不连续的阶段演变与新的Combortus对流的新兴和发展与前东的深入对流的新兴和发展有关。虽然相跳的特征长度缩小取决于开尔文波响应，但相关的时间尺度表示由于边界层湿润而导致前部的不稳定分层。上述特征长度和时间尺度的组合效果决定了观察到的慢向后阶段速度。这种相位演化特性似乎支持强调边界层水分不对称的第二种类型的水分模式理论，因为第一类的水分模式理论强调水分或MSE倾向不对称，可能有利于更“平滑”的相位传播。基于水分预算分析，找到了纵向依赖的预静电机制。对于东方印度洋的MJO，MJO对流前的前置前景来自垂直平流，而对于西太平洋的MJO，它归因于表面蒸发过程。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号