火星和土卫六大气中的环形变率模
Annular Modes of Variability in the Atmospheres of Mars and Titan
摘要：
环形模式解释了地球大气层的大部分内部变化，但从未在其他行星上被发现。使用火星的再分析和泰坦的模拟，我们证明了环形模式是突出的两个世界的大气，解释了各自的可变性的大部分。一种模式描述了火星上喷流的纬度变化，就像在地球上一样，以及泰坦上喷流的垂直变化。另一个描述了三个星球上的中纬度涡动动能脉冲，尽管特征有些不同。我们进一步证明，后一种模式对火星上的区域尘埃活动具有预测能力，揭示了它对了解火星天气的有用性。此外，我们在动态多样的世界中发现了类似的环形变化，这表明它在行星大气中无处不在，为比较行星学开辟了一条新的途径，也为太阳系外大气的表征提供了额外的考虑。
英文摘要：
Annular modes explain much of the internal variability of Earth's atmosphere but have never been identified on other planets. Using reanalyses for Mars and a simulation for Titan, we demonstrate that annular modes are prominent in the atmospheres of both worlds, explaining large fractions of their respective variabilities. One mode describes latitudinal shifts of the jet on Mars, as on Earth, and vertical shifts of the jet on Titan. Another describes pulses of midlatitude eddy kinetic energy on all three worlds, albeit with somewhat different characteristics. We further demonstrate that this latter mode has predictive power for regional dust activity on Mars, revealing its usefulness for understanding Martian weather. In addition, our finding of similar annular variability in dynamically diverse worlds indicates its ubiquity across planetary atmospheres, opening a new avenue for comparative planetology as well as an additional consideration for characterization of extrasolar atmospheres.
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