Hannover 2003 – scientific programme

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UP: Umweltphysik

UP 3: Atmosphäre: Datenauswertung und Modellierung, Instrumentelles, Laborexperimente – Poster

UP 3.10: Poster

Thursday, March 27, 2003, 16:00–18:00, Lichthof

Multi Axis Differential Optical Absorption Spectroscopy for measurements of volcanic emissions — •Nicole Bobrowski¹, Gerd Hönninger¹, Bo Galle², and Ulrich Platt¹ — ¹Institut für Umweltphysik, Universität Heidelberg, Im Neuenheimer Feld 229, 69120 Heidelberg — ²Chalmers University of Technology (CTH), S-41296 Goethenburg, Sweden

A new designed Mini-Max-DOAS instrument was used for the first time during volcanic gas emission measurements in 2001. With MAX-DOAS any trace gas with sufficiently large absorption cross section in the UV-VIS wavelength range can be measured. BrO was identified in a volcanic plume for the first time. SO₂ emissions were studied. In order to quantify the emission source strength (the net fluxes) from the volcano, a number of MAX-DOAS measurements were carried out. By scanning the volcanic plume the extension and the trace gas content could be derived. Mixing ratios reached up to   1 ppb BrO and   1 ppm SO₂, respectively. Including wind speed data an emission rate of 350 t reactive Br/year and 1.8 10⁵ t S/year can be estimated. Assuming a similar Br/S emission ratio for all volcanoes a global Br source strength of the order of 30000 t/year would result. This can have significant effects both for tropospheric and stratospheric chemistry.