Report of a large depletion in the ozone layer over southern Brazil and Uruguay by using multi-instrumental data

• Published in: Annales Geophysicae
• Main Authors: Bresciani, Caroline, Bittencourt, Gabriela Dornelles, Bageston, José Valentin, Pinheiro, Damaris Kirsch, Schuch, Nelson Jorge, Bencherif, Hassan, Paes Leme, Neusa, Peres, Lucas Vaz
• Other Authors: Universidade Federal de Santa Maria = Federal University of Santa Maria Santa Maria, RS, Brazil (UFSM), National Institute for Space Research Sao José dos Campos = Instituto Nacional de Pesquisas Espaciais (INPE), Federal University of Santa Maria, Brazil, Federal University of Sanat Maria, Laboratoire de l'Atmosphère et des Cyclones (LACy), Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS)-Météo-France, Instituto Nacional de Pesquisas Espaciais (INPE), Ministério da Ciência, Tecnologia e Inovação
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2018
• Subjects: Atmospheric composition and structure (middle; atmosphere – composition and chemistry; instruments and techniques; [SDU]Sciences of the Universe [physics]; Antarctic; The Antarctic; Uruguay; Antarc*
• Online Access: https://hal.univ-reunion.fr/hal-01753357; https://hal.univ-reunion.fr/hal-01753357/document; https://hal.univ-reunion.fr/hal-01753357/file/Bresciani%20et%20al,%20ANGEO%202018.pdf; https://doi.org/10.5194/angeo-36-405-2018

International audience Ozone is one of the chemical compounds that form part of the atmosphere. It plays a key role in the stratosphere where the " ozone layer " is located and absorbs large amounts of ultraviolet radiation. However, during aus-tral spring (August–November), there is a massive destruction of the ozone layer, which is known as the " Antarctic ozone hole ". This phenomenon decreases ozone concentration in that region, which may affect other regions in addition to the polar one. This anomaly may also reach mid-latitudes; hence, it is called the " secondary effect of the Antarctic ozone hole ". Therefore, this study aims to identify the passage of an ozone secondary effect (OSE) event in the region of the city of Santa Maria – RS (29.68 • S, 53.80 • W) by means of a multi-instrumental analysis using the satellites TIMED/SABER, AURA/MLS, and OMI-ERS. Measurements were made in São Martinho da Serra/RS – Brazil (29.53 • S, 53.85 • W) using a sounding balloon and a Brewer Spectrophotometer. In addition, the present study aims to describe and analyse the influence that this strato-spheric ozone reduction has on temperatures presented by these instruments, including data collected through the radio occultation technique. The event was first identified by the AURA/MLS satellite on 19 October 2016 over Uruguay. This reduction in ozone concentration was found by comparing the climatology for the years 1996–1998 for the state of Rio Grande do Sul, which is close to Uruguay. This event was already observed in Santa Maria/RS-Brazil on 20 Oc-tober 2016 as presented by the OMI-ERS satellite and the Brewer Spectrophotometer. Moreover, a significant decrease was reported by the TIMED/SABER satellite in Uruguay. On 21 October, the poor ozone air mass was still over the region of interest, according to the OMI-ERS satellite, data from the sounding balloon launched in Santa Maria/RS-Brazil, and measurements made by the AURA/MLS satellite. Furthermore , the influence of ozone on the stratosphere temperature was ...