Seasonal reappearance of HCl in the atmosphere of Mars during the Mars year 35 dusty season
Astronomy and Astrophysics EDP Sciences 647:March 2021 (2021) A161
Abstract:
HCl was discovered in the atmosphere of Mars for the first time during the global dust storm in Mars year (MY) 34 (July 2018) using the Atmospheric Chemistry Suite mid-infrared channel (ACS MIR) on the ExoMars Trace Gas Orbiter. The simultaneity of variations in dust and HCl, and a correlation between water vapour and HCl, led to the proposal of a novel surface-atmosphere coupling analogous to terrestrial HCl production in the troposphere from salt aerosols. After seasonal dust activity restarted in MY 35 (August 2020), we have been monitoring HCl activity to determine whether such a coupling was validated. Here we present a new technique for analyzing the absorption features of trace gases close to the ACS MIR noise level and report that HCl mixing ratios are observed to rapidly increase in both hemispheres coincidentally with the onset of the MY 35 perihelion dust season. We present the temporal evolution of the vertical distribution of HCl (0.1–6 ppbv) and of dust activity in both hemispheres. We also report two observations of > 2 ppbv HCl below 10 km in the northern hemisphere during the aphelion period.Saturn´s Stratospheric Hazes From HST Ultraviolet Imaging
(2021)
Abstract:
Variations in spectral reflectivity and vertical cloud structure of Jupiter’s Great Red Spot
(2021)
Abstract:
Recent Mid-Infrared Through Submillimeter Observations of Uranus and Neptune
(2021)
Abstract:
Vertical Structure and Color of Jovian Latitudinal Cloud Bands during the Juno Era
The Planetary Science Journal American Astronomical Society 2:1 (2021) 16-16