Reactive bromine in the low troposphere of Antarctica: estimations at two research sites
| Autor: | C. Prados-Roman, L. Gómez-Martín, O. Puentedura, M. Navarro-Comas, J. Iglesias, J. R. de Mingo, M. Pérez, H. Ochoa, M. E. Barlasina, G. Carbajal, M. Yela |
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| Přispěvatelé: | Instituto Nacional de Técnica Aeroespacial (INTA), Grenoble Institut des Neurosciences (GIN), Université Joseph Fourier - Grenoble 1 (UJF)-Institut National de la Santé et de la Recherche Médicale (INSERM), Laboratorio de Física de la Materia Condensada, Centro de Fisica (IVIC), Instituto Venezolano de Investigaciones Cientificas (IVIC)-Instituto Venezolano de Investigaciones Cientificas (IVIC) |
| Rok vydání: | 2018 |
| Předmět: |
Atmospheric Science
Ozone 010504 meteorology & atmospheric sciences TROPOSFERA 010402 general chemistry Atmospheric sciences 01 natural sciences 7. Clean energy BROMO lcsh:Chemistry Troposphere ANTARTIDA chemistry.chemical_compound medicine Mixing ratio Sunrise ComputingMilieux_MISCELLANEOUS 0105 earth and related environmental sciences [PHYS]Physics [physics] Differential optical absorption spectroscopy Seasonality medicine.disease lcsh:QC1-999 0104 chemical sciences Trace gas lcsh:QD1-999 chemistry 13. Climate action Environmental science Polar lcsh:Physics |
| Zdroj: | Atmospheric Chemistry and Physics Atmospheric Chemistry and Physics, European Geosciences Union, 2018, 18 (12), pp.8549-8570. ⟨10.5194/acp-18-8549-2018⟩ Atmospheric Chemistry and Physics. 2018, 18 Repositorio Institucional (UCA) Pontificia Universidad Católica Argentina instacron:UCA Atmospheric Chemistry and Physics, Vol 18, Pp 8549-8570 (2018) |
| ISSN: | 1680-7324 1680-7316 |
| DOI: | 10.5194/acp-18-8549-2018 |
| Popis: | Fil: Prados Roman, Cristina. National Institute for Aerospace Technology. Atmospheric Research and Instrumentation Branch; España Fil: Gómez Martín, Laura. National Institute for Aerospace Technology. Atmospheric Research and Instrumentation Branch; España Fil: Gómez Martín, Laura. Université de Reims Champagne. Groupe de Spectrométrie Moléculaire et Atmosphérique; Francia Fil: Puentedura, Olga. National Institute for Aerospace Technology. Atmospheric Research and Instrumentation Branch; España Fil: Navarro Comas, Mónica. National Institute for Aerospace Technology. Atmospheric Research and Instrumentation Branch; España Fil: Iglesias, Javier. National Institute for Aerospace Technology. Atmospheric Research and Instrumentation Branch; España Fil: De Mingo, José Ramón. National Institute for Aerospace Technology. Space Sensors Engineering; España Fil: Pérez, Javier. National Institute for Aerospace Technology. Atmospheric Research and Instrumentation Branch; España Fil: Ochoa, Héctor. Dirección Nacional del Antártico. Instituto Antártico Argentino; Argentina Fil: Barlasina, María Helena. Servicio Meteorológico Nacional; Argentina Fil: Carbajal, Gerardo. Servicio Meteorológico Nacional; Argentina Fil: Carbajal, Gerardo. Pontificia Universidad Católica Argentina. Facultad de Ingeniería y Ciencias Agrarias; Argentina Fil: Yela, Margarita. National Institute for Aerospace Technology. Atmospheric Research and Instrumentation Branch; España Abstract: For decades, reactive halogen species (RHSs) have been the subject of detailed scientific research due to their influence on the oxidizing capacity of the atmosphere and on the climate. From the RHSs, those containing bromine are of particular interest in the polar troposphere as a result of their link to ozone-depletion events (ODEs) and to the perturbation of the cycle of toxic mercury, for example. Given its remoteness and related limited accessibility compared to the Arctic region, the RHSs in the Antarctic troposphere are still poorly characterized. This work presents ground-based observations of tropospheric BrO from two different Antarctic locations: Marambio Base (64∘13′ S, 56∘37′ W) and Belgrano II Base (77∘52′ S, 34∘7′ W) during the sunlit period of 2015. By means of MAX-DOAS (Multi-axis Differential Optical Absorption Spectroscopy) measurements of BrO performed from the two research sites, the seasonal variation in this reactive trace gas is described along with its vertical and geographical distribution in the Antarctic environment. Results show an overall vertical profile of BrO mixing ratio decreasing with altitude, with a median value of 1.6 pmol mol−1 in the lowest layers of the troposphere. Additionally, observations show that the polar sunrise triggers a geographical heterogeneous increase in bromine content in the Antarctic troposphere yielding a maximum BrO at Marambio (26 pmol mol−1), amounting to 3-fold the values observed at Belgrano at dawn. Data presented herein are combined with previous studies and ancillary data to update and expand our knowledge of the geographical and vertical distribution of BrO in the Antarctic troposphere, revealing Marambio as one of the locations with the highest BrO reported so far in Antarctica. Furthermore, the observations gathered during 2015 serve as a proxy to investigate the budget of reactive bromine (BrOx = Br + BrO) and the bromine-mediated ozone loss rate in the Antarctic troposphere. |
| Databáze: | OpenAIRE |
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