We present images of Mars obtained in the 2.0 µm CO₂ band with the United Kingdom Infrared Telescope (UKIRT). The images reveal topographic features of the Martian surface that are usually invisible in direct albedo images at visible or IR wavelengths, but agree remarkably well with the topography of the planet as mapped by the MOLA instrument on Mars Global Surveyor. The CO₂ band depth is a measure of the absorbing column of CO₂ and hence determined primarily by the surface atmospheric pressure. The surface pressure variations are detected with a sensitivity of 4–5 Pa. We compare our data with radiative transfer models and find that the measured CO₂ variation with pressure is consistent with the models. We discuss the possibility that similar observations might be used to observe atmospheric pressure changes due to Martian weather systems.
展开▼
机译：我们展示了使用英国红外望远镜（UKIRT）在2.0 µm CO 2波段获得的火星图像。这些图像揭示了火星表面的地形特征，这些特征通常在可见光或红外波长的直接反照率图像中是看不见的，但与火星全球测量师在MOLA仪器上绘制的行星的地形非常吻合。 CO 2能带深度是CO 2吸收柱的量度，因此主要由表面大气压确定。检测到的表面压力变化的灵敏度为4-5 Pa。我们将我们的数据与辐射传递模型进行了比较，发现测得的CO2随压力的变化与模型一致。我们讨论了将类似的观测结果用于观测火星天气系统导致的气压变化的可能性。
展开▼
