Untangling the Annual Cycle of the Tropical Tropopause Layer with an Idealized Moist Model
Untangling the Annual Cycle of the Tropical Tropopause Layer with an Idealized Moist Model
复制标题
用理想化的潮湿模型解开热带对流层顶层的年循环
DOI：
10.1175/jcli-d-17-0127.1
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发表时间：
2017
影响因子：
4.9
通讯作者：
E. Gerber
中科院分区：
文献类型：
--
作者：
M. Jucker;E. Gerber
摘要热带对流层顶层和冷点的气候学和年循环调节过程尚不完全清楚。已经确定了三个主要驱动因素：由热带对流激发的行星尺度赤道波，与深层布鲁尔-多布森环流相关的行星尺度温带波，以及与中纬度风暴路径相关的天气尺度波。在观测和综合大气模式中，这三者都是共存的，因此很难区分它们的贡献。本文提出了一种新的中等复杂性大气模型。简单地修改模型的下边界，就可以详细地研究TTL的三个关键过程，无论是单独的还是一起的。该模式表明，热带行星波对调节平均TTL、设定冷点深度和温度最为关键。然而，TTL的年周期，在北方冬季（夏季）最冷（最热），主要取决于…
AbstractThe processes regulating the climatology and annual cycle of the tropical tropopause layer (TTL) and cold point are not fully understood. Three main drivers have been identified: planetary-scale equatorial waves excited by tropical convection, planetary-scale extratropical waves associated with the deep Brewer–Dobson circulation, and synoptic-scale waves associated with the midlatitude storm tracks. In both observations and comprehensive atmospheric models, all three coexist, making it difficult to separate their contributions. Here, a new intermediate-complexity atmospheric model is developed. Simple modification of the model’s lower boundary allows detailed study of the three processes key to the TTL, both in isolation and together.The model shows that tropical planetary waves are most critical for regulating the mean TTL, setting the depth and temperature of the cold point. The annual cycle of the TTL, which is coldest (warmest) in boreal winter (summer), however, depends critically on the stro...
影响因子：
18.3
作者：
Hegglin, M. I.;Plummer, D. A.;Weigel, K.
通讯作者：
Weigel, K.