Definition and calibration of a light UV-Visible spectrometer sonde mini-SAOZ for studying convective transport on the stratospheric chemistry

• Main Author: Vicomte, Marie
• Other Authors: STRATO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris VI, Jean-Pierre Pommereau([e-mail])
• Format: Doctoral or Postdoctoral Thesis
• Language: French
• Published: HAL CCSD 2013
• Subjects: UV-Visible spectroscopy; balloon; cross sections; retrieval; tropical convection; spectrométrie UV-Visible; ballon; sections efficaces; inversion; overshoot; convection tropicale; [SDU.OCEAN]Sciences of the Universe [physics]/Ocean; Atmosphere; Kiruna
• Online Access: https://tel.archives-ouvertes.fr/tel-00980307; https://tel.archives-ouvertes.fr/tel-00980307/document; https://tel.archives-ouvertes.fr/tel-00980307/file/these_finale_Marie_Vicomte.pdf

The convective overshooting are phenomena known for a long time above the tropical continents. They are suspected to be a major source of tropospheric very short lived species, humidification by ice crystals injection, and possibly NOx formed by lightning in the lower stratosphere. However, measurements next and above such cumulo-nimbus clouds are not an easy task. The mini SAOZ is a UV-Visible spectrometer developed in LATMOS since 2009 on more advanced technology. This instrument is making measurements of atmospheric profiles of minor chemical species (O3, H2O, NO2, O4, O2, BrO, OClO,CH2O) by solar occultation. With its new high performance and light-weight payload, the mini-SAOZ is embedded on small balloons for studying the tropical convection. Two flights of qualification have taken place in Kiruna in 2010 and 2011 with the support of CNES. The results of the spectral analysis and the different problems met during the flights have permitted improvements of the instrument to be qualified for the next flights in tropics. Two flights of mini-SAOZ have been operated during the TRO-pico campaign, in 2012, whose objective was to better understand the impact of the tropical convection on the stratospheric chemical composition. The comparisons with other instruments validate the performances of the mini-SAOZ. However, the measurements get through this thesis don't still permit to prove with certainty the mechanisms linked to the tropical convection. Les overshoots convectifs sont des phénomènes connus depuis longtemps au-dessus des continents tropicaux. Ils sont soupçonnés d'être une source majeure dans la basse stratosphère des espèces à courte durée de vie de la troposphère, de l'humidification par injection de cristaux de glace, et de NOx formés par la foudre. Cependant les mesures dans ces systèmes convectifs n'est pas une tâche facile. Le mini-SAOZ est un spectromètre UV-Visible développé au LATMOS depuis 2009 avec une technologie avancée. Il est conçu pour les mesures des profils atmosphériques des espèces ...