Ultrathin Tropical Tropopause Clouds (UTTCs): I. Cloud morphology and occurrence
Ultrathin Tropical Tropopause Clouds (UTTCs): I. Cloud morphology and occurrence
复制标题
超薄热带对流层顶云（UTTC）： I. 云形态和发生
DOI：
10.5194/acp-3-1083-2003
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发表时间：
2003
影响因子：
6.3
通讯作者：
L. Stefanutti
中科院分区：
文献类型：
--
作者：
T. Peter;B. Luo;M. Wirth;C. Kiemle;H. Flentje;V. Yushkov;V. Khattatov;V. Rudakov;Andreas Thomas;S. Borrmann;G. Toci;P. Mazzinghi;J. Beuermann;C. Schiller;F. Cairo;G. Donfrancesco;A. Adriani;C. Volk;J. Ström;K. Noone;V. Mitev;R. Mackenzie;K. Carslaw;T. Trautmann;V. Santacesaria;L. Stefanutti
下可见卷云（SVC）可能有助于热带对流层顶附近的脱水。更高和更冷的SVC以及它们的冰晶越大，它们越有可能代表气相与冰相的最后有效接触点，因此，在空气进入平流层之前，最后的脱水步骤。1999年2月/3月，在西印度洋的APE-THESEO活动期间，对SVCs进行了第一次现场和遥感同时测量。热带对流层顶超薄云（UTTC）是地球大气层中最薄的大尺度云。个别UTTC可能存在数小时，作为一个只有200- 300米厚的云层，仅在热带冷点对流层顶以下几百米，覆盖面积达105平方公里。这些云的温度低至181 K，是确定进入平流层下部的空气的水混合比的主要代表。
Subvisible cirrus clouds (SVCs) may contribute to dehydration close to the tropical tropopause. The higher and colder SVCs and the larger their ice crystals, the more likely they represent the last efficient point of contact of the gas phase with the ice phase and, hence, the last dehydrating step, before the air enters the stratosphere. The first simultaneous in situ and remote sensing measurements of SVCs were taken during the APE-THESEO campaign in the western Indian ocean in February/March 1999. The observed clouds, termed Ultrathin Tropical Tropopause Clouds (UTTCs), belong to the geometrically and optically thinnest large-scale clouds in the Earth's atmosphere. Individual UTTCs may exist for many hours as an only 200--300 m thick cloud layer just a few hundred meters below the tropical cold point tropopause, covering up to 105 km2. With temperatures as low as 181 K these clouds are prime representatives for defining the water mixing ratio of air entering the lower stratosphere.