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A user-orientated column modelling framework for efficient analyses of the Martian atmosphere

机译:用于有效分析火星氛围的用户至上的列模型框架

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As spacecraft missions return ever more data from Mars, additional tools will be required to explore and analyse these datasets efficiently. To streamline research into the atmosphere of Mars, a user-orientated modelling capability is developed that enables automatic initialisation and running of a column model. As a demonstration we utilise the modelling framework to provide additional verification for the University of Helsinki and Finnish Meteorological Institute Mars column model temperature profiles above the height of typical lander meteorological measurements, i.e. above 2m. We utilise the framework at landing site locations that are well characterised to understand the model's applicability and to identify future opportunities for modifications to the framework. We do this by using the framework to compare the column model to temperature soundings made by the Mars Reconnaissance Orbiter. We find that the column model, without any modification, is able to reproduce the observed lapse rates and average temperatures closely in most cases except for a 20–60K increase over the northern hemisphere mid-winter. We can reproduce this discrepancy by incorporating an adiabatic heating term into the column model. Fitting of the modified column model to the observations results in estimated maximum downward vertical wind velocities of ~10cms?1 at altitudes of 15–20km over the winter solstice at the VL-1 and VL-2 sites. The approach developed here may possibly provide a way to independently estimate or observe the vertical motion in the Martian atmosphere. However, even though the magnitude of the vertical wind speed appears reasonable, it is not clear at this point how much the atmospheric heating is due to other mechanisms such as advection. We have introduced new application software that can quickly find and display the requested data and can be immediately analysed using the included tools. We have demonstrated the potential of this type of software application with a glimpse into the upper atmosphere of Mars.
机译:由于航天器任务从MARS返回更多数据,因此将有效地探索和分析这些数据集。为了将研究简化到火星的大气中,开发了一种面向用户的建模能力,可以自动初始化和运行列模型。作为一个示范,我们利用了建模框架,为赫尔辛基大学和芬兰气象研究所的火星柱模型温度剖面提供额外的验证,高于典型着陆气象测量的高度,即2米以上。我们利用框架在着陆现场地点,该框架具有很好的特征,以了解模型的适用性,并确定未来对框架的修改机会。我们通过使用该框架来将列模型与MARS侦察轨道引线进行的温度探测进行比较。我们发现柱式模型,没有任何修改,能够在大多数情况下密切地再现观察到的失效率和平均气温,除了北半球冬季北半球增加20-60k。我们可以通过将绝热的加热术语掺入柱模型来再现这种差异。修改的柱模型与观察结果的拟合导致VL-1和VL-2位点的冬至15-20km的高度〜10cms〜10cms的最大向下垂直风速。这里开发的方法可能提供了一种独立估计或观察火星大气中的垂直运动的方法。然而,即使垂直风速的大小似乎是合理的,目前尚不清楚大气加热是由于其他机制如平流。我们引入了可以快速查找和显示所请求数据的新应用软件,可以使用包含的工具立即分析。我们已经展示了这种软件应用程序的潜力,一瞥了火星的上层大气层。

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