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Orbit-spin coupling and the circulation of the Martian atmosphere

机译：轨道自旋耦合和火星大气环流

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摘要

The physical origins of the observed interannual variability of weather and climate on Mars are poorly understood. In this paper we introduce a deterministic physical mechanism that may account for much of the variability of the circulation of the Mars atmosphere on seasonal and longer timescales. We focus on a possible coupling between the planetary orbital angular momentum and the angular momentum of the planetary rotation. We suspect that the planetary atmosphere may participate in an exchange of momentum between these two reservoirs. Nontrivial changes in the circulation of the atmosphere are likely to occur, as the atmospheric system gains and loses angular momentum, during this exchange. We derive a coupling expression linking orbital and rotational motions that produces an acceleration field varying with position and with time on and within a subject body. The spatially and temporally varying accelerations may interfere constructively or destructively with large-scale flows of geophysical fluids that are established and maintained by other means. This physical hypothesis predicts cycles of intensification and relaxation of circulatory flows of atmospheres on seasonal and longer timescales that are largely independent of solar forcing. The predictions of this hypothesis may be tested through numerical modeling. Examples from investigations of the atmospheric circulation of Mars are provided to illustrate qualitative features and quantitative aspects of the coupling mechanism proposed.
机译：人们对火星上观测到的天气和气候年际变化的物理起源知之甚少。在本文中，我们介绍了一种确定性的物理机制，该机制可能解释了火星大气层在季节和更长的时间尺度上的环流变化。我们着眼于行星轨道角动量与行星旋转角动量之间的可能耦合。我们怀疑行星大气可能参与了这两个储层之间的动量交换。在交换过程中，随着大气系统获得和失去角动量，很可能会发生大气环流的重要变化。我们推导出一个将轨道运动和旋转运动联系起来的耦合表达式，该耦合表达式会产生一个加速度场，该加速度场随对象体内和对象内部的位置和时间而变化。在空间和时间上变化的加速度可能会对通过其他方式建立和维护的大规模地球物理流体流产生建设性或破坏性干扰。这种物理假设可以预测季节和更长的时间尺度上大气环流增强和松弛的周期，而这些时间尺度在很大程度上与太阳的强迫无关。该假设的预测可以通过数值建模来检验。提供了有关火星大气环流调查的示例，以说明所提出的耦合机制的定性特征和定量方面。

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