Relationships Between HCl, H 2 O, Aerosols, and Temperature in the Martian Atmosphere: 1. Climatological Outlook

Journal of Geophysical Research: Planets American Geophysical Union 129:8 (2024) e2024JE008350

Authors:

KS Olsen, AA Fedorova, DM Kass, A Kleinböhl, A Trokhimovskiy, OI Korablev, F Montmessin, F Lefèvre, L Baggio, J Alday, DA Belyaev, JA Holmes, JP Mason, PM Streeter, K Rajendran, MR Patel, A Patrakeev, A Shakun

Abstract:

Detecting trace gases such as hydrogen chloride (HCl) in Mars' atmosphere is among the primary objectives of the ExoMars Trace Gas Orbiter (TGO) mission. Terrestrially, HCl is closely associated with active volcanic activity, so its detection on Mars was expected to point to some form of active magmatism/outgassing. However, after its discovery using the mid‐infrared channel of the TGO Atmospheric Chemistry Suite (ACS MIR), a clear seasonality was observed, beginning with a sudden increase in HCl abundance from below detection limits to 1–3 ppbv in both hemispheres coincident with the start of dust activity, followed by very sudden and rapid loss at the southern autumnal equinox. In this study, we have investigated the relationship between HCl and atmospheric dust by making comparisons in the vertical distribution of gases measured with ACS and aerosols measured co‐located with the Mars Climate Sounder (MCS). This study includes HCl, water vapor, and ozone measured using ACS MIR, water vapor and temperature measured with the near infrared channel of ACS, and temperature, dust opacity, and water ice opacity measured with MCS. In part 1, we show that dust loading has a strong impact in temperature, which controls the abundance of water ice and water vapor, and that HCl is very closely linked to water activity. In part 2, we investigate the quantitative correlations between each quantity and discuss the possible source and sinks of HCl, their likelihood given the correlations, and any issues arising from them.

Design and testing of the Lunar Thermal Mapper optics

SPIE, the international society for optics and photonics (2024) 98

Authors:

Rory Evans, Neil Bowles, Simon Calcutt, Keith Nowicki, Cyril Bourgenot, Bethany L Ehlmann

Cryogenic testing of the integrated Ariel space telescope: design of the optical test equipment

Proceedings of SPIE--the International Society for Optical Engineering SPIE, the international society for optics and photonics 13092 (2024) 130924v-130924v-17

Authors:

Robert Spry, Manuel Abreu, Keith Nowicki, Neil Bowles, Maisie Rashman, Cédric Pereira, Jake Hutchinson, David Miguel Ventura de Castro Alves, Rory Evans, Robert Watkins, Waqas Mir, John-Paul Walker, Ioannis Argyriou, Joss Guy, Juergen Schmoll, Chris Davison, Henry Eshbaugh, Alexandre Cabral, Rachel Drummond, Lucile Desjonqueres, Mark Anderson, Georgia Bishop, Paul Eccleston, Enzo Pascale, Andrew Caldwell, Giovanna Tinetti

Stability of the OGSE Vis-NIR illumination sub-system for the future ARIEL space mission

Proceedings of SPIE--the International Society for Optical Engineering SPIE, the international society for optics and photonics 13092 (2024) 130924w-130924w-11

Authors:

Cédric Pereira, Manuel Abreu, D Castro Alves, Alexandre Cabral, Robert Spry, Neil E Bowles, Keith Nowicki, Maisie F Rashman

The Ariel payload design post-PDR

Proceedings of SPIE--the International Society for Optical Engineering SPIE, the international society for optics and photonics 13092 (2024) 130921b-130921b-21

Authors:

Paul Eccleston, Andrew Caldwell, Georgia Bishop, Lucile Desjonqueres, Rachel Drummond, Alex Davidson, Martin Whalley, Martin Caldwell, Chris Pearson, Caroline Simpson, Sandy Fok, Davide Bruzzi, Alex Davies, Mark Anderson, Pranav Umesh, Enzo Pascale, Gianluca Morgante, Mauro Focardi, Giorgio Savini, Marc Ollivier, Miroslaw Rataj, Giuseppe Malaguti, Giovanna Tinetti, Andrea Tozzi, Paolo Chioetto, Emanuele Pace, Paola Zuppella, Giampaolo Preti, Christophe Serre, Jose M Gomez, Gustavo Alonso, Javier Perez, Neil Bowles, Keith Nowicki, Jérôme Martignac, Michel Berthé, Pascale Danto, Martin Crook, Matthew Hills, Charles Padley, Semu Makinen, Zsolt Kovacs, Janos Szoke, Peter Szirovicza, Mateusz Sobiecki, Konrad Skup, Piotr Wawer, Roland Ottensamer, Warren Holmes, Renaud Goullioud, Markus Czupalla, Niels Christian Jessen, Soren Pedersen, Tom Ray, Deirdre Coffey, Lukas Steiger, Carlos Compostizo, Ricardo Machado, Andrea Bocchieri, Lorenzo Mugnai, Stephan Birkmann, Salma Fahmy, Ludovic Puig, Delphine Jollet, Anders Svedevall, Thierry Tirolien, Jean-Christophe Salvignol, Jean-Philippe Halain