Albedo of the south pole on Mars determined by topographic forcing of atmosphere dynamics
Albedo of the south pole on Mars determined by topographic forcing of atmosphere dynamics
复制标题
火星南极的反照率由大气动力学的地形强迫决定
作者：
A. Colaprete;J. Barnes;R. Haberle;J. Hollingsworth;H. Kieffer;T. Titus
自从第一次航天器观测以来，火星南极冰帽的性质一直是个谜。特别是，常年二氧化碳冰盖的存在，被称为神秘区域的大片黑色板状冰的形成，以及冰盖在春季的不对称退缩，都无法解释。在这里，我们提供的观测和气候模拟表明，火星南极的特点是两个不同的区域气候，这是最大的南方撞击盆地Argyre和Hellas动力强迫的结果。地表结霜的方式受这些区域气候的控制。在极地60° S和米切尔山脉以西延伸180°(∼30° W)的寒冷和暴风雨条件下，地面霜冻积累以降水为主。在相反的半球，极地大气相对温暖和晴朗，霜冻积累以直接水汽沉积为主。正是这些沉积方式的差异决定了盖层反照率。
The nature of the martian south polar cap has remained enigmatic since the first spacecraft observations,,,,,. In particular, the presence of a perennial carbon dioxide ice cap, the formation of a vast area of black ‘slab ice’ known as the Cryptic region and the asymmetric springtime retreat of the cap have eluded explanation. Here we present observations and climate modelling that indicate the south pole of Mars is characterized by two distinct regional climates that are the result of dynamical forcing by the largest southern impact basins, Argyre and Hellas. The style of surface frost deposition is controlled by these regional climates. In the cold and stormy conditions that exist poleward of 60° S and extend 180° in longitude west from the Mountains of Mitchel (∼ 30° W), surface frost accumulation is dominated by precipitation. In the opposite hemisphere, the polar atmosphere is relatively warm and clear and frost accumulation is dominated by direct vapour deposition. It is the differences in these deposition styles that determine the cap albedo.
影响因子：
4.9
作者：
Gehrels, N;Chincarini, G;Zhang, WW
通讯作者：
Zhang, WW