부산대학교 도서관

We report vertical profiles of water and D/H for one Martian year as measured with the TGO/NOMAD instrument. The observations were performed via solar occultation, providing water profiles up to ∼100 km and D/H up to ∼60 km, with a vertical resolution of 1–2 km. The measurements reveal dramatic variability of water and D/H over short timescales and with altitude and location on the planet. We investigated the release of seasonal water from the polar caps during southern and northern summer, by mapping water and its D/H near the polar regions. Above the hygropause, the D/H drops substantially below 2 VSMOW, and both seasonal polar caps show a consistent and enriched D/H of 5–7 VSMOW within the hygrosphere. Plain Language Summary: In our observations of water and its deuterium isotopic ratio (D/H) across a whole Martian year, we observe dramatic variations in the vertical distributions, in particular during dusty storms. The D/H ratio measured above the seasonal northern polar cap is consistent with that above the southern polar cap. Key Points: A full Martian year of water and D/H ratio data are reportedDramatic variations are observed in the vertical distributions of water and D/H during the dusty seasonsThe D/H ratio measured above the seasonal northern polar cap is consistent with that above the southern polar cap [ABSTRACT FROM AUTHOR]