Orogenic Convection in Subtropical South America as Seen by the TRMM Satellite
Orogenic Convection in Subtropical South America as Seen by the TRMM Satellite
复制标题
TRMM卫星观测到的南美洲副热带造山对流
DOI：
10.1175/mwr-d-10-05006.1
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发表时间：
2011
影响因子：
3.2
通讯作者：
R. Houze
中科院分区：
文献类型：
--
作者：
K. Rasmussen;R. Houze
摘要南美洲东南部极端造山带对流风暴可分为深对流核风暴、宽对流核风暴和宽层状区风暴三大类。来自热带降雨测量任务卫星降水雷达的数据显示，具有宽对流核心的风暴是最频繁的，往往起源于科尔多瓦山脉附近。上层的下坡气流盖住了夜间增强的低空急流，从而阻止对流的爆发，直到急流碰到陡峭的斜坡地形，如科尔多瓦山脉或安第斯山麓，这样潮湿的低空空气就被提升到足以释放不稳定并克服顶盖。这种顶盖和触发类似于喜马拉雅山西北部附近释放强烈对流的方式。然而，南美洲东南部具有宽对流核的强风暴与喜马拉雅地区的强风暴不同，它们表现出超前的特征。
AbstractExtreme orogenic convective storms in southeastern South America are divided into three categories: storms with deep convective cores, storms with wide convective cores, and storms containing broad stratiform regions. Data from the Tropical Rainfall Measuring Mission satellite’s Precipitation Radar show that storms with wide convective cores are the most frequent, tending to originate near the Sierra de Cordoba range. Downslope flow at upper levels caps a nocturnally enhanced low-level jet, thus preventing convection from breaking out until the jet hits a steep slope of terrain, such as the Sierra de Cordoba Mountains or Andean foothills, so that the moist low-level air is lifted enough to release the instability and overcome the cap. This capping and triggering is similar to the way intense convection is released near the northwestern Himalayas. However, the intense storms with wide convective cores over southeastern South America are unlike their Himalayan counterparts in that they exhibit leadi...
影响因子：
3.2
作者：
J. Marsham;S. Trier;T. Weckwerth;James W. Wilson
通讯作者：
J. Marsham;S. Trier;T. Weckwerth;James W. Wilson