Halogenated trace compounds in fumarolic gases of the Nicaraguan subduction zone volcanoes: variation patterns, budgets and impact on the Earth's atmosphere.

Frische, Matthias (2005) Halogenated trace compounds in fumarolic gases of the Nicaraguan subduction zone volcanoes: variation patterns, budgets and impact on the Earth's atmosphere. Open Access (PhD/ Doctoral thesis), Christian-Albrechts-Universität, Kiel, Germany, 97 pp.

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Abstract

Halogenated compounds are important constituents of the Earth's atmosphere, because they may have strong influence on its physical and chemical properties. The most abundant halogenated hydrocarbons in volcanic gas samples from fumaroles of the quiescently degassing Nicaraguan subduction zone volcanoes Momotombo, Cerro Negro and Mombacho, collected during four field campaigns between July 2001 and July 2003, were CH3Cl, CH3Br, CH3I, CH2Cl2, CHCl3, CCl4, C2H5Cl, C2H5Br, C2H5I and C2H3Cl. The variability in concentrations at different time-scales (minutes to years) is less than two orders of magnitude for the single volcanoes. Estimations of gas fluxes at Momotombo indicate that the contribution of quiescently degassing volcanoes to the global halo(hydro)carbon inventory is very low. Assuming that the investigated volcanoes are representative, the question of a significant volcanic contribution of stable halogenated compounds (CFCs, HFCs, HCFCs, Halons, CF4, NF3 and SF6) to the atmospheric budget can be negated. Furthermore a new sampling setup for fumarolic trace gases is presented.

Document Type: Thesis (PhD/ Doctoral thesis)
Thesis Advisor: Hansteen, Thor and Eisenhauer, Anton
Keywords: Geodynamics; Meteorology; Geochemistry; Ozone depleting substances, volcanic effects on atmospheric composition, subduction zones, trace gas fluxes, halogenated greenhouse gases, quiescently degassing, volcanoes, fumaroles, Nicaragua
Research affiliation: OceanRep > SFB 574 > C4
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
OceanRep > SFB 574 > C3
OceanRep > SFB 574
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS Magmatic and Hydrothermal Systems
Refereed: No
Open Access Journal?: Yes
Projects: SFB574
Date Deposited: 03 Dec 2008 16:50
Last Modified: 20 Mar 2019 14:15
URI: http://oceanrep.geomar.de/id/eprint/8116

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