Diurnal and Seasonal Variations of Gravity Waves in the Lower Atmosphere of Mars as Observed by InSight

IF 3.9 1区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Journal of Geophysical Research: Planets Pub Date : 2025-02-02 DOI:10.1029/2024JE008746

J. Hernández-Bernal, A. Spiga, A. Chatain, J. Pla-Garcia, D. Banfield

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Abstract

We investigate Gravity Waves (GWs) in the lower atmosphere of Mars based on pressure timeseries acquired by the InSight lander. We compile a climatology showing that most GW activity detected at the InSight landing site takes place after the sunrise and sunset; they are almost absent during the aphelion season, and more prominent around the equinoxes, with variations during dust events and interannual variations. We find GWs with coherent phases in different sols, and a previously unnoticed coincidence of GW activity with those moments in which the diurnal cycle (of tidal origin) exhibits the fastest increases in absolute pressure. We explore the possibility that some of these GWs might actually be high-order harmonics of thermal tides transiently interfering constructively to produce relevant meteorological patterns, and discuss other interpretations based on wind patterns. The so-called Terminator Waves observed on Earth might also explain some of our observations.

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洞察号观测到的火星低层大气中重力波的日变化和季节变化

我们根据洞察号着陆器获得的压力时间序列研究火星低层大气中的重力波（GWs）。我们编制了一份气候学报告，显示在洞察号着陆点检测到的大多数GW活动发生在日出和日落之后；它们在远日点季节几乎不存在，而在春分前后更为突出，在沙尘事件和年际变化期间发生变化。我们发现，在不同的溶胶中，gww具有相一致的相位，并且gww的活动与（潮汐起源）日周期的绝对压力增长最快的时刻有一个以前未注意到的巧合。我们探讨了其中一些GWs实际上可能是热潮汐的高次谐波，短暂地建设性地干扰产生相关的气象模式，并讨论了基于风模式的其他解释。在地球上观测到的所谓的终结者波也可以解释我们的一些观测结果。

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来源期刊

Journal of Geophysical Research: Planets Earth and Planetary Sciences-Earth and Planetary Sciences (miscellaneous)

CiteScore

8.00

自引率

27.10%

发文量

254

期刊介绍： The Journal of Geophysical Research Planets is dedicated to the publication of new and original research in the broad field of planetary science. Manuscripts concerning planetary geology, geophysics, geochemistry, atmospheres, and dynamics are appropriate for the journal when they increase knowledge about the processes that affect Solar System objects. Manuscripts concerning other planetary systems, exoplanets or Earth are welcome when presented in a comparative planetology perspective. Studies in the field of astrobiology will be considered when they have immediate consequences for the interpretation of planetary data. JGR: Planets does not publish manuscripts that deal with future missions and instrumentation, nor those that are primarily of an engineering interest. Instrument, calibration or data processing papers may be appropriate for the journal, but only when accompanied by scientific analysis and interpretation that increases understanding of the studied object. A manuscript that describes a new method or technique would be acceptable for JGR: Planets if it contained new and relevant scientific results obtained using the method. Review articles are generally not appropriate for JGR: Planets, but they may be considered if they form an integral part of a special issue.