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UP: Fachverband Umweltphysik

UP 3: Meßtechnik

UP 3.2: Vortrag

Mittwoch, 25. März 2015, 17:45–18:00, G/gHS

BrO/SO₂ emission ratios from four "NOVAC" volcanoes — •F. Dinger¹, P. Lübcke¹, S. Warnach¹, N. Bobrowski¹, L. Vogel^1,7, U. Platt¹, T. Wagner², S. Arellano³, B. Galle³, G. Garzon⁴, S. Hildago⁵, and M. Yalire⁶ — ¹IUP, University of Heidelberg, Germany — ²MPIC, Mainz, Germany — ³Chalmers University of Technology, Gothenburg, Sweden — ⁴SGC, Cali, Colombia — ⁵IGEPN, Quito, Ecuador — ⁶OVG, D.R. Congo — ⁷now at University of Leicester, UK

Volcanic gas emissions often correlate with changes in the volcanic system. The total amount and the chemical composition of gas emissions help to understand the volcanic system and thus allow to improve forecasts of volcanic activity. BrO/SO₂ ratios can be obtained by remote-sensing Differential Optical Absorption Spectroscopy (DOAS). The Network for Observation of Volcanic and Atmospheric Change (NOVAC) has installed 80 scanning DOAS instruments at 30 volcanoes world wide. The instruments monitor volcanic emissions by measuring scattered solar radiation. SO₂ emissions are continuously monitored and transmitted to the observatories. While the retrieval of volcanic SO₂ emissions from NOVAC data is well developed, the retrieval of volcanic halogen emissions is more challenging due to the lower amount and therefore lower optical densities. This work will focus on an overview of the currently evaluated data, discuss the results, and investigate the BrO/SO₂ ratio in volcanic emissions as a potential proxy for the magma depth. We will show examples from Nyiragongo (Congo), Tungurahua (Ecuador), Nevado del Ruiz and Galeras (Colombia).