STAGE NOyBOx: integrated instrument for nitrogenous compounds measurements during field campaigns

Date de mise à jour de l’offre

Université Paris Est Créteil Val de Marne :

Etablissement public national scientifique, culturel et professionnel

Description de la mission

Chemical compounds that are released into the atmosphere undergo a variety of multi-phase chemical and physical processes leading to their transformation into many products. These substances can negatively affect air quality and thus human and ecosystem health. It is critically important to understand the factors that control the pathways by which compounds are converted from their emitted forms into new ones while producing ozone and oxidized substances and influencing creation and/or growth of particles.
In this context, the ACROSS (Atmospheric ChemistRy Of the Suburban foreSt) project is designed to improve understanding of atmospheric oxidation through a carefully planned observational field campaign that will take place in summer 2022 in Ile-de-France region. This project aims more precisely at improving our knowledge of the chemical evolution of mid-latitude urban plumes when they mix with surrounding biogenic emissions primarily.
Among all the atmospheric pollutants, nitrogenous compounds have a key role in tropospheric chemistry. These species that include NO, NO2, NO3, N2O5, HONO, PAN, HNO3 or organic nitrates, which sum is called NOy, are linked into complex reactive cycles that lead to the formation of secondary pollutants such as ozone. They also play a role in the formation and aging of secondary organic aerosol. For these reasons, measuring these compounds and their speciation is crucial for the understanding of the atmospheric chemical processes. The development of a common ensemble integrating the state-of-the-art tools for NOx and NOy measurements in a common rack (hereafter called NOyBOx) is therefore ongoing to perform coherent measurement following common strategies (eg. Vertical profiling along a tower, ground measurements…). LISA has a long experience in measuring those species and some of these measurement are already available (NO, selective NO2, NO3 radical measurements at trace level).
The under graduated student will participate to the development of instruments for individual measurement of the missing species: N2O5 and HONO by IBBCEAS (Incoherent broad-band cavity-enhanced absorption spectroscopy) technique (taking advantage of our expertise in this field) and the sum of nitrogen containing species (NOy) by ozone chemiluminescence analyzer coupled with a gold-converter. After these developments, the under graduated students will perform the characterization of these instruments at the laboratory and possibly on the field.

Profil recherché

The candidate must have a solid background in atmospheric physics and chemistry. Knowledge in spectroscopy would be appreciated.

Niveau de qualification requis

Bac + 4/5 et +
  • Employeur
    Université Paris Est Créteil Val de Marne
  • Secteur d’activité de la structure
    Enseignement - Formation - Recherche
  • Effectif de la structure
    Plus de 250 salariés
  • Type de stage ou contrat
    Stage pour lycéens et étudiants en formation initiale
  • Date prévisionnelle de démarrage
  • Durée du stage ou contrat
    Plus de 4 mois et jusqu'à 6 mois
  • Le stage est-il rémunéré ?
  • Niveau de qualification requis

    Bac + 4/5 et +
  • Lieu du stage
    Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA), Université Paris Est Créteil
    61 avenue du général de Gaulle
    94000 CRETEIL
  • Accès et transports
    Métro 8 (arrêt Créteil Université) et RER D (arrêt le Vert de Maisons)