Frank Daerden
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View article: Exploring gravity wave activity in the Martian atmosphere using ExoMars TGO/NOMAD observations and modelling
Exploring gravity wave activity in the Martian atmosphere using ExoMars TGO/NOMAD observations and modelling Open
On Mars, gravity-wave induced density and temperature fluctuations have been observed by orbiting platforms (e.g. [1-5]), during aerobraking [6-7] and from the surface [8]. Their effects are also seen in airglow imagery [9].We present a cl…
View article: Martian CO vertical distribution combining 3 Martian Years of TGO/ACS MIR solar occultation data
Martian CO vertical distribution combining 3 Martian Years of TGO/ACS MIR solar occultation data Open
Carbon monoxide (CO) has extensively been monitored in the martian atmosphere due to its dual significance: it provides insights into the dymanics and into photochemical processes between this molecule with others in the Martian atmosphere…
View article: The interannual vertical distribution of ozone in the Mars atmosphere and observation-model discrepancies
The interannual vertical distribution of ozone in the Mars atmosphere and observation-model discrepancies Open
The Nadir and Occultation for Mars Discovery (NOMAD) instrument aboard the ExoMars Trace Gas Orbiter (TGO) has been conducting observations of the vertical profile and column abundance of ozone in the Mars atmosphere since April 2018. NOMA…
View article: Global wind map on Mars during and after the global dust storm in 2018 measured by ALMA
Global wind map on Mars during and after the global dust storm in 2018 measured by ALMA Open
The wind velocity field plays a fundamental role in understanding atmospheric physics. Gaining insight into the three-dimensional structure of atmospheric circulation leads to a deeper comprehension of the mechanisms governing the transpor…
View article: Global mapping of molecular oxygen on Mars
Global mapping of molecular oxygen on Mars Open
Recent observations by NASA’s Curiosity Rover have revealed unexpected seasonal changes in molecular oxygen (O2) levels in the Martian atmosphere at Gale Crater, its landing site [1]. This finding is puzzling, as the atmospheric lifetime o…
View article: Biases on the retrieval of aerosols' properties from VIS-NIR data: the NOMAD case study
Biases on the retrieval of aerosols' properties from VIS-NIR data: the NOMAD case study Open
Data acquired by spaceborne spectrometers operating in the visual (VIS) and near-infrared (NIR) spectral ranges, are commonly exploited to derive the microphysical properties of planetary atmospheric aerosols (e.g. Adriani et al., 2015; Si…
View article: Towards a new climatology of Martian water vapor column abundance derived from NOMAD LNO nadir full mission observations
Towards a new climatology of Martian water vapor column abundance derived from NOMAD LNO nadir full mission observations Open
Water vapor (H2O) is a highly variable minor constituent of the Martian atmosphere. Through its well characterized seasonal cycle, it controls, together with CO2 and dust cycles, the present Mars climate. In particular, H2O plays a crucial…
View article: Martian atmospheric aerosol latitudinal and seasonal analysis over 3 full MYs from Nomad/TGO solar occultation observations
Martian atmospheric aerosol latitudinal and seasonal analysis over 3 full MYs from Nomad/TGO solar occultation observations Open
On Mars, the most common types of atmospheric aerosols are composed of mineral dust and/or water ice. They have large effects on Martian climate, such as the absorption of solar radiation, altering the radiative balance of the planet, and …
View article: The ExoMars 2016 Trace Gas Orbiter: Recent Results from NOMAD
The ExoMars 2016 Trace Gas Orbiter: Recent Results from NOMAD Open
The ExoMars Trace Gas Orbiter has been operating around Mars since April 2018, amassing a wealth of knowledge about the atmosphere and surface of the Red Planet. Onboard are two spectrometer suites, NOMAD and ACS, a surface camera, CASSIS,…
View article: Long-Term variations in Mars’ ozone column abundances : A study from MY34 to MY38
Long-Term variations in Mars’ ozone column abundances : A study from MY34 to MY38 Open
Measurement of the Mars ozone column abundance provide key insights about our understanding of the planet’s photochemistry, climate dynamics, and potential habitability. Ozone acts as a tracer for odd-hydrogen offering insights into its se…
View article: Out-of-season water escape during Mars’ northern summer triggered by a strong localized dust storm
Out-of-season water escape during Mars’ northern summer triggered by a strong localized dust storm Open
Mars almost certainly had a significant amount of water in its past. Recent observations reveal that during southern summer, when the atmosphere is warmer and dustier, water vapor can reach high altitudes without condensing, leading to wat…
View article: Water Vapor Vertical Distribution on Mars after Six Years of TGO/NOMAD Solar Occultations. Part II: Cross-validation within TGO and comparison with models
Water Vapor Vertical Distribution on Mars after Six Years of TGO/NOMAD Solar Occultations. Part II: Cross-validation within TGO and comparison with models Open
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View article: Aerosol Climatology on Mars as Observed by NOMAD UVIS on ExoMars TGO
Aerosol Climatology on Mars as Observed by NOMAD UVIS on ExoMars TGO Open
The Nadir and Occultation for MArs Discovery spectrometer on board Trace Gas Orbiter began science operations in April 2018, providing infrared and ultraviolet‐visible spectra of the Martian atmosphere. This paper explores the application …
View article: Ultraviolet NO and Visible O<sub>2</sub> Nightglow in the Mars Southern Winter Polar Region: Statistical Study and Model Comparison
Ultraviolet NO and Visible O<sub>2</sub> Nightglow in the Mars Southern Winter Polar Region: Statistical Study and Model Comparison Open
The Mars NO and the O 2 nightglow are produced by the recombination of atoms produced on the dayside by photodissociation and transported to the nightside. These emissions are tracers of the summer to winter pole dynamics in the upper Mars…
View article: Composition and Chemistry of the Martian Atmosphere as Observed by Mars Express and ExoMars Trace Gas Orbiter
Composition and Chemistry of the Martian Atmosphere as Observed by Mars Express and ExoMars Trace Gas Orbiter Open
View article: Strong Localized Pumping of Water Vapor to High Altitudes on Mars During the Perihelion Season
Strong Localized Pumping of Water Vapor to High Altitudes on Mars During the Perihelion Season Open
Here we present water vapor vertical profiles observed with the ExoMars Trace Gas Orbiter/Nadir and Occultation for MArs Discovery instrument during the perihelion and Southern summer solstice season ( L S = 240°–300°) in three consecutive…
View article: Aerosol Climatology on Mars as Observed by NOMAD UVIS/SO on ExoMars TGO
Aerosol Climatology on Mars as Observed by NOMAD UVIS/SO on ExoMars TGO Open
Aerosols are an important part of the Martian atmosphere. They are composed of dust, H2O ice, and CO2 ice. Dust is the main aerosol and has a significant contribution to the radiative transfer budget, as it absorbs solar radiation, leading…
View article: Earth Years (3 Martian Years) of Mars Observations by NOMAD on ExoMars TGO
Earth Years (3 Martian Years) of Mars Observations by NOMAD on ExoMars TGO Open
On 21st April 2018, the ExoMars Trace Gas Orbiter began its nominal science phase [1]. Since then, for the last 6 and a half years, the NOMAD instrument has taken more than a 100 million spectra in the ultra-violet, visible and infrared.NO…
View article: Global Mapping of HCl on Mars by IRTF/iSHELL
Global Mapping of HCl on Mars by IRTF/iSHELL Open
Hydrogen chloride (HCl)—a key marker of the chlorine cycle on Mars—has been recently discovered in the Martian atmosphere by the ExoMars/TGO mission. In-orbit data indicate that this molecule appears in the atmosphere only in a limited tim…
View article: Evidence for transient morning water frost deposits on the Tharsis volcanoes of Mars
Evidence for transient morning water frost deposits on the Tharsis volcanoes of Mars Open
View article: CO2 in the atmosphere of Mars depleted in 13C
CO2 in the atmosphere of Mars depleted in 13C Open
We present here vertically resolved measurements of the carbon isotopic composition of CO2 in the Martian atmosphere between the surface and 50 km of altitude. The results are based on data taken by the ExoMars Trace Gas Orbiter with the N…
View article: Constraining the global composition of D/H and 18O/16O in Martian water using SOFIA/EXES
Constraining the global composition of D/H and 18O/16O in Martian water using SOFIA/EXES Open
Isotopic ratios in water vapour carry important information about the water reservoir on Mars. Localized variations in these ratios can inform us about the water cycle and surface–atmosphere exchanges. On the other hand, the global isotopi…
View article: Climatology and Diurnal Variation of Ozone Column Abundances for 2.5 Mars Years as Measured by the NOMAD‐UVIS Spectrometer
Climatology and Diurnal Variation of Ozone Column Abundances for 2.5 Mars Years as Measured by the NOMAD‐UVIS Spectrometer Open
The distribution of Mars ozone (O 3 ) is well established; however, our knowledge on the dayside diurnal variation of O 3 is limited. We present measurements of Mars O 3 column abundances, spanning Mars Year (MY) 34 to the end of MY 36, by…
View article: A 3 Martian Year climatology of aerosols with ExoMars TGO-NOMAD: seasonal cycles and new insights
A 3 Martian Year climatology of aerosols with ExoMars TGO-NOMAD: seasonal cycles and new insights Open
The Nadir and Occultation for MArs Discovery (NOMAD) spectrometer has been collecting Mars observations since 2018, providing a massive amount of information regarding its atmospheric composition, its vertical structure and bridging the ga…
View article: Martian aerosol Climatology on Mars as Observed by NOMAD UVIS on ExoMars TGO
Martian aerosol Climatology on Mars as Observed by NOMAD UVIS on ExoMars TGO Open
The NOMAD (“Nadir and Occultation for MArs Discovery”) spectrometer suite onboard the ExoMars Trace Gas Orbiter (TGO) is composed of three spectrometers. In this work, we will use the UVIS channel in occultation mode. An aeroso…
View article: Minimum Noise Fraction Analysis of TGO/NOMAD LNO Channel High-Resolution Nadir Spectra of Mars
Minimum Noise Fraction Analysis of TGO/NOMAD LNO Channel High-Resolution Nadir Spectra of Mars Open
NOMAD is a suite of spectrometers on the board of the ESA-Roscosmos Trace Gas Orbiter (TGO) spacecraft and is capable of investigating the Martian environment at very high spectral resolution in the ultraviolet–visible and infrared spectra…
View article: Ultraviolet and Visible Reflectance Spectra of Phobos and Deimos as Measured by the ExoMars‐TGO/NOMAD‐UVIS Spectrometer
Ultraviolet and Visible Reflectance Spectra of Phobos and Deimos as Measured by the ExoMars‐TGO/NOMAD‐UVIS Spectrometer Open
Spectroscopic measurements are a powerful tool to investigate the surface composition of airless bodies and provide clues of their origin. The composition and origin of Phobos and Deimos are still unknown and are currently widely debated. …
View article: Heterogeneous Processes in the Atmosphere of Mars and Impact on H<sub>2</sub>O<sub>2</sub> and O<sub>3</sub> Abundances
Heterogeneous Processes in the Atmosphere of Mars and Impact on H<sub>2</sub>O<sub>2</sub> and O<sub>3</sub> Abundances Open
Current models underestimate the highest observed ozone (O 3 ) column densities on Mars. These estimates could be improved by including the uptake of odd hydrogen species (HO x ) on water ice clouds, but the reported uptake coefficient of …
View article: Observation of the Mars O2 visible nightglow by the NOMAD spectrometer onboard the Trace Gas Orbiter
Observation of the Mars O2 visible nightglow by the NOMAD spectrometer onboard the Trace Gas Orbiter Open
View article: Martian Atmospheric Aerosols Composition and Distribution Retrievals During the First Martian Year of NOMAD/TGO Solar Occultation Measurements: 1. Methodology and Application to the MY 34 Global Dust Storm
Martian Atmospheric Aerosols Composition and Distribution Retrievals During the First Martian Year of NOMAD/TGO Solar Occultation Measurements: 1. Methodology and Application to the MY 34 Global Dust Storm Open
Since the beginning of the Trace Gas Orbiter (TGO) science operations in April 2018, its instrument “Nadir and Occultation for MArs Discovery” (NOMAD) supplies detailed observations of the IR spectrums of the Martian atmosphere. We develop…