Gas Emissions From the Western Aleutians Volcanic Arc

A reassessment of current volcanic emissions from the Central American arc with specific examples from Nicaragua

The Central American volcanic arc supplies a significant proportion of the persistent annual global sulphur dioxide emissions from volcanoes. In November/December 2003, we completed a survey of the arc section from Mombacho to San Cristóbal in Nicaragua recording individual mean fluxes of 800, 530 and 220 Mg day 1 in the plumes from San Cristóbal, Telica and Masaya, respectively. An assessment ...

The Slab Portal Beneath the Western Aleutians

Tomographic images of the distribution of shear wave speed beneath the northwestern Pacific delineate the configuration of the subducted oceanic lithosphere beneath the western Aleutian Arc. At ~100 km depth, a fast shear wave speed anomaly lies beneath the Aleutian Arc everywhere east of 173E. Between 164E and 173E, however, seismic velocities at this depth are slow relative to the surrounding...

Do volcanic emissions affect carbon gas fluxes in peatlands?

Recently, a link has been suggested between volcanic deposition of SO4 and the suppression of CH4 emissions in northern peatlands (Gauci et al., 2008). This link stems from the widely accepted idea that acid rain SO4 additions to peatlands can cause a shift in microbial communities as SO4 reducing bacteria out-compete methanogens for substrates, which results in a suppression of CH4 emission. H...

Indonesian volcanic emissions

Atmospheric transport and deposition of Indonesian volcanic emissions M. A. Pfeffer, B. Langmann, and H.-F. Graf Department of the Atmosphere in the Earth System, Max-Planck-Institute for Meteorology, Hamburg, Germany Department of Geography, University of Cambridge, Cambridge, UK Received: 6 September 2005 – Accepted: 8 October 2005 – Published: 21 November 2005 Correspondence to: M. A. Pfeffe...

Respiratory effects of volcanic emissions.