Remobilization of crustal carbon may dominate volcanic arc emissions

Magnesium Isotopes as a Tracer of Crustal Materials in Volcanic Arc Magmas in the Northern Cascade Arc

Fifteen North Cascade Arc basalts and andesites were analyzed for Mg isotopes to investigate the extent and manner of crustal contributions to this magmatic system. The δ 26Mg of these samples vary from within the range of ocean island basalts (the lightest being −0.33 ± 0.07‰) to heavier compositions (as heavy as −0.15 ± 0.06‰). The observed range in chemical and isotopic composition is simila...

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.

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 ...