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Date:7/12/2013

ation of impacts associated with dramatic climate change occurring at that time.


CO2 degassing from hydrothermal vents at Kolumbo submarine volcano, Greece, and the accumulation of acidic crater water
Steven Carey et al., Graduate School of Oceanography, University of Rhode Island, 215 S. Ferry Road, Narragansett, Rhode Island 02882, USA. First published on 11 July 2013, http://dx.doi.org/10.1130/G34286.1.

Hydrothermal vents in the crater of Kolumbo submarine volcano (Aegean Sea) are discharging carbon dioxide together with fluids at temperatures up to 220 degrees C. The gas is dissolving into seawater close to the bottom, leading to significant acidification of the water inside the crater with pH levels down to 5.0. This water is trapped within the bowl-shaped crater because of its increased density associated with high carbon dioxide contents. Lack of abundant macrofauna at the Kolumbo hydrothermal vents and the occurrence of carbonate-poor sediment in the crater appear to be consequences of this local anomaly in ocean acidification. These sites provide important opportunities to study the composition of gases released to the ocean and their contribution to the global carbon flux. Build-up of CO2-rich water in the bowl-shaped crater of Kolumbo may be producing hazardous conditions analogous to some African volcanic lakes (Monoun and Nyos) where overturn of gas-rich bottom waters led to abrupt releases of CO2 at the surface. Water samples collected near the floor of Kolumbo volcano released gas when they were brought to the surface and exposed to atmospheric pressure. A minimum estimate of 1.4 by 105 cubic meters of excess CO2 may exist in the bottom 10 meters of the Kolumbo crater.


Holocene sea-level change derived from microbial mats
Daniel Livsey and Alexander R. Simms, Department of Earth Science, University of CaliforniaSanta Ba
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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