Analysis of a southern sub-polar short-term ozone variation event using a millimetre-wave radiometer

• Published in: Annales Geophysicae
• Main Authors: Orte, Pablo Facundo, Wolfram, Elian, Salvador, Jacobo, Mizuno, Akira, Bègue, Nelson, Bencherif, Hassan, Bali, Juan Lucas, d'Elia, Raúl, Pazmino, Andrea, Godin-Beekmann, Sophie, Ohyama, Hirofumi, Quiroga, Jonathan
• Other Authors: Centro de Investigaciones en Láseres y Aplicaciones Buenos Aires (CEILAP), Consejo Nacional de Investigaciones Científicas y Técnicas Buenos Aires (CONICET)-Instituto de Investigaciones Científicas y Técnicas para la Defensa (CITEDEF), Facultad Regional Buenos Aires (UTN-FRBA), Universidad Tecnológica Nacional Sarmiento (UTN), Consejo Nacional de Investigaciones Científicas y Técnicas Buenos Aires (CONICET), Institute for Space-Earth Environmental Research Nagoya (ISEE), Nagoya University, 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, School of Chemistry and Physics Durban, University of KwaZulu-Natal Durban, Afrique du Sud (UKZN), STRATO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), National Institute for Environmental Studies (NIES), JICA and JST, the French–Argentine ECOS-Sud (A16U01 project), and JSPS KAKENHI (grant no. JP 18KK0289).
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2019
• Subjects: [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph]; [SDU.OCEAN]Sciences of the Universe [physics]/Ocean; Atmosphere; Antarc*; Antarctic
• Online Access: https://insu.hal.science/insu-02065404; https://insu.hal.science/insu-02065404/document; https://insu.hal.science/insu-02065404/file/angeo-37-613-2019.pdf; https://doi.org/10.5194/angeo-37-613-2019

International audience Subpolar regions in the Southern Hemisphere are influenced by the Antarctic polar vortex during austral spring, which induces high and short-term ozone variability at different altitudes, mainly into the stratosphere. This variation may affect considerably the total ozone column changing the harmful UV radiation that reaches the surface.With the aim of studying ozone with a high time resolution at different altitudes in subpolar regions, a millimetre-wave radiometer (MWR) was installed at the Observatorio Atmosférico de la Patagonia Austral (OAPA), Río Gallegos, Argentina (51.6∘ S, 69.3∘ W), in 2011. This instrument provides ozone profiles with a time resolution of ∼1 h, which enables studies of short-term ozone mixing ratio variability from 25 to ∼70 km in altitude. This work presents the MWR ozone observations between October 2014 and 2015, focusing on an atypical event of the polar vortex and Antarctic ozone hole influence over Río Gallegos detected from the MWR measurements at 27 and 37 km during November of 2014. During the event, the MWR observations at both altitudes show a decrease in ozone followed by a local peak of ozone amount of the order of hours. This local recovery is observed thanks to the high time resolution of the MWR mentioned. The advected potential vorticity (APV) calculated from the MIMOSA high-resolution advection model (Modélisation Isentrope du transport Méso-échelle de l'Ozone Stratosphérique par Advection) was also analysed at two isentropic levels (levels of constant potential temperature) of 675 and 950 K (∼27 and ∼37 km of altitude, respectively) to understand and explain the dynamics at both altitudes and correlate the ozone rapid recovery with the passage of a tongue with low PV values over Río Gallegos. In addition, the MWR dataset was compared for the first time with measurements obtained from the Microwave Limb Sounder (MLS) at individual altitude levels (27, 37 and 65 km) and with the differential absorption lidar (DIAL) installed in the OAPA to ...