AI 中文总结
研究人员通过奇异谱分析处理洞察号超一个火星年的压力观测数据，直接提取出火星大气中与周日潮汐共振的准周日开尔文波，验证了火星行星气候模型对相关现象的再现能力。
AI 中文摘要
在火星沙尘暴的启动阶段，多个表面压力记录中观测到了纬向波数1的标准模开尔文波（K1）的频谱特征。然而，由于K1的本征频率与周日潮汐的本征频率相近，二者难以分离，因此K1信号尚未被直接提取。我们对超过一个火星年的洞察号表面压力观测数据（包括MY34 C型沙尘暴C34）应用奇异谱分析，该分析使我们能够直接提取瞬态K1信号。在北半球春季和秋季，清晰的K1信号出现，平均振幅约为2帕；在C34风暴期间，K1振幅达到8帕，与同期周日信号（S1）的最大值39帕相比十分显著。在峰值时间附近，K1与S1同相位，且S1周期意外缩短至23.5个火星小时，随后K1迅速衰减，S1周期恢复至24个火星小时。K1与S1之间的相位关系以及S1周期缩短表明，S1与K1之间发生了共振。与洞察号着陆点最近的模型网格点的模拟结果对比显示，火星行星气候模型能够真实再现观测到的表面压力变化特征。
英文摘要
During the initiation phase of Martian dust storms, a spectral signature of a zonal wavenumber 1 normal mode Kelvin wave (K1) has been observed in several surface pressure records. However, the K1 signal has not been extracted directly since its eigenfrequency is close to that of the diurnal tide, making their separation difficult. We apply singular spectrum analysis to more than one Martian year of InSight surface pressure observations, including the MY34 C dust storm (C34). This analysis enables us to directly extract the transient K1 signal. Clear K1 signals appear during the Northern-Hemisphere spring and autumn with the average amplitudes of around 2 Pa. They reach 8 Pa during the C34 storm, which is substantial compared with a simultaneous diurnal signal (S1) maximum of 39 Pa. Near the peak time, K1 and S1 are in phase, and unexpectedly the S1 period shortens to 23.5 Mars hours. Subsequently, K1 rapidly decays and the S1 period recovers to 24 Mars hours. The phase relation between K1 and S1 as well as the S1 period shortening indicates that a resonance occurred between S1 and K1. Comparison with simulations at the model grid point closest to the InSight landing site shows that the Mars Planetary Climate Model realistically reproduces the observed characteristics of the surface pressure variations.
Comments25 pages, 1 table, 5 figures
