The annual volcanic gas input into the atmosphere, in particular into the stratosphere: global data set for the past 100 years

Halmer, Martina M., Schmincke, Hans-Ulrich and Graf, H.-F. (2002) The annual volcanic gas input into the atmosphere, in particular into the stratosphere: global data set for the past 100 years Journal of Volcanology and Geothermal Research, 115 (3-4). pp. 511-528. DOI 10.1016/S0377-0273(01)00318-3.

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We compiled a global data set of volcanic degassing during both explosive and quiescent volcanic events. The data set comprises estimates of gas emissions of volcanoes from Europe (e.g. Etna), Asia (e.g. Merapi), the Americas (e.g. Fuego), Africa (e.g. Erta Ale) and ocean islands (e.g. Kilauea) over the past 100 yr. The set includes 50 monitored volcanoes and ∼310 extrapolated explosively erupting volcanoes. Among the ∼360 volcanoes, 75% are located in the Northern and 25% in the Southern Hemisphere. We have estimated the total annual global volcanic sulfur emission into the atmosphere to be on the order of 7.5–10.5×1012 g/yr S (here as SO2), amounting to 10–15% of the annual anthropogenic sulfur output (∼70×1012 g/yr S during the decade 1981–1990) and 7.5–10.5% of the total global sulfur emission (e.g. biomass burning, anthropogenic, dimethylsulfide) with ∼100×1012 g/yr S. The estimates of other volcanic gases emitted (e.g. H2S, HCl) are based on the assumption that the different gas components emitted by a volcano are in equilibrium with each other. Accordingly, the molar ratios of the gas species in high-temperature fumaroles are similar to molar ratios equilibrated at depth where the gas separates from the magma. Thus, we can use the directly measured SO2 fluxes and known molar ratios (e.g. H2S/SO2) for a semi-quantitative estimate of other gas components emitted (e.g. H2S). The total annual emission of HCl is 1.2–170×1012 g/yr, that of H2S 1.5–37.1×1012 g/yr, of HF 0.7–8.6×1012 g/yr, of HBr 2.6–43.2×109 g/yr, and of OCS 9.4×107–3.2×1011 g/yr. We estimate an emission of 1.3×107–4.4×1010 g/yr for CS2.

Document Type: Article
Keywords: sulfur dioxide; volcanic sulfuric gases; explosive degassing; stratospheric sulfur input
Research affiliation: OceanRep > SFB 574 > C4
OceanRep > SFB 574
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS Magmatic and Hydrothermal Systems
Refereed: Yes
DOI etc.: 10.1016/S0377-0273(01)00318-3
ISSN: 0377-0273
Projects: SFB574
Contribution Number:
SFB 5746
Date Deposited: 07 Apr 2010 11:48
Last Modified: 20 Jul 2017 07:01

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