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首页> 外文期刊>Geophysical Research Letters >CloudSat shedding new light on high-reaching tropical deep convection observed with Meteosat
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CloudSat shedding new light on high-reaching tropical deep convection observed with Meteosat

机译：利用Meteosat观测到的CloudSat揭示了高空热带深对流的新发现

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摘要

Characteristics of warmer water vapor pixels (WWVPs) defined by brightness temperature difference (Delta TB) between 6.2 mu m and 10.8 mu m channel of Meteosat-8 greater than zero were examined using collocated CloudSat data during the period from 15 October to 15 November 2006 over tropical Africa. On the basis of CloudSat we provide a physical interpretation of Delta TB > 0. It is found that WWVPs occur in deep convective areas where cloud tops are in the tropical tropopause layer above 14 km. It is also found that the relationship between 10.8 mm TB and DTB is generally linear and WWVPs are frequent with very cold cloud top temperatures lower than the cold-point tropopause temperature. These findings suggest that WWVPs are explained by the contrast between colder background of 10.8 mu m TB associated with overshooting tropical deep convection and warmer water vapor channel temperature due to the emission from water vapor lines in the warmer stratosphere above.
机译：在2006年10月15日至11月15日期间，利用并置的CloudSat数据，研究了由Meteosat-8的6.2μm和10.8μm通道之间的亮度温度差（Delta TB）大于零定义的较暖水汽像素（WWVP）的特征。在热带非洲。在CloudSat的基础上，我们提供了Delta TB> 0的物理解释。发现WWVP发生在深对流区，在该区域对流层顶云层位于14 km以上的热带对流层。还发现，10.8 mm TB与DTB之间的关系通常是线性的，并且在极冷的云顶温度低于冷对流层顶温度的情况下，WWVP很常见。这些发现表明，WWVP的解释是由于热带上方对流层上方水蒸气管线的排放，与热带深对流过高相关的10.8μmTB较冷背景与水蒸气通道温度较高之间的对比。

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