TRAMS: A new dynamic cloud model for Titan's methane clouds
TRAMS: A new dynamic cloud model for Titan's methane clouds
复制标题
TRAMS：土卫六甲烷云的新动态云模型
DOI：
10.1029/2006gl028652
复制
发表时间：
2007
影响因子：
5.2
通讯作者：
S. Rafkin
中科院分区：
文献类型：
--
作者：
E. Barth;S. Rafkin
土卫六上的对流云可能在气候动力学、大气化学和整个挥发性循环中发挥重要作用。为了研究这些云的形成和演变，我们开发了泰坦区域大气模拟系统（TRAMS）。TRAMS是一个三维的、与时间相关的、耦合的完全可压缩的动力学和微物理模型，能够模拟土卫六大气中的甲烷和乙烷云。在二维区域的初始模型测试中，暖气泡或随机温度扰动会触发一团空气上升。对于一个初始的甲烷轮廓与60%的表面湿度，对流发生1 K或更大的正温度扰动。云顶在25至35公里之间，与南极云的观测结果一致。对于低层大气中干燥的甲烷环境，惠更斯着陆点的特征，对流不会发生，但在10公里左右的高度能够形成一层层状云。
Convective clouds on Titan may play an important role in climate dynamics, atmospheric chemistry, and the overall volatile cycle. To study the formation and evolution of these clouds, we have developed the Titan Regional Atmospheric Modeling System (TRAMS). TRAMS is a three‐dimensional, time‐dependent, coupled fully compressible dynamic and microphysical model capable of simulating methane and ethane clouds in Titan's atmosphere. In initial model tests over a two‐dimensional domain, a warm bubble or random temperature perturbations trigger a parcel of air to rise. For an initial methane profile with a 60% surface humidity, convection occurs for positive temperature perturbations of 1 K or greater. Cloud tops are between 25 and 35 km, consistent with observations of the south polar clouds. For a drier methane environment in the lower atmosphere, characteristic of the Huygens landing site, convection does not occur, but a layer of stratiform clouds is able to form at altitudes around 10 km.