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- W4386965412 abstract "Measurements of atmospheric methane by the Curiosity rover's SAM-TLS instrument are providing evidence of seasonality and diurnal variation in concentration. Given methane's short atmospheric lifetime relative to geological timescales, its presence implies a replenishing source, and the observed variation demands the proposition of a modulation mechanism. This paper focuses on the modulation mechanism on a diurnal scale, extending earlier modeling of seasonal variation. Our modeling shows that barometric pumping driven by both diurnal and seasonal variation of atmospheric pressure, along with possible adsorption and desorption of methane in the shallow subsurface driven by temperature and pressure change, can explain the variation in methane concentration. In the model, an active, continuous, steady-state deep source of methane is assumed, and carbon dioxide serves as the carrier gas for drawing methane and possible trace gaseous constituents into the atmosphere." @default.
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- W4386965412 date "2024-01-01" @default.
- W4386965412 modified "2023-10-09" @default.
- W4386965412 title "Short-term variation in Mars atmospheric methane concentrations driven by barometric pumping" @default.
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- W4386965412 doi "https://doi.org/10.1016/j.icarus.2023.115810" @default.
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