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Thermal history of deep-sea sediments as a record of recent changes in the deep circulation of the eastern Mediterranean ArchiMer
Della Vedova, B; Pellis, G; Camerlenghi, A; Foucher, Jean-paul; Harmegnies, Francois.
[1] During three cruises of the MEDRIFF project in 1993 and 1994, 154 geothermal heat flow measurements and seven CTD profiles in the water column have been collected along a 300 km SW-NE oriented transect traversing the Mediterranean Ridge accretionary complex. The original goal of the measurements was to identify areas of anomalous heat flow that could be interpreted as possible sites for fluid outflow. Contrary to expectations, the upper few meters of the temperature profiles in the sediments showed decreasing temperature from the seafloor down to 3 to 6 m depth indicating consistently transient temperature regimes. The only exception ( positive heat flow) was found in the Sirte abyssal plain. Measurements collected in the same area at different times...
Tipo: Text Palavras-chave: Eastern Mediterranean; Aegean waters; Sediment warming; Heat flow measurements; Thermal modeling; Thermal history.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/00000/10675/9319.pdf
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Methane release from warming-induced hydrate dissociation in the West Svalbard continental margin: Timing, rates, and geological controls ArchiMer
Thatcher, K. E.; Westbrook, Graham; Sarkar, S.; Minshull, T. A..
Hundreds of plumes of methane bubbles, first observed in 2008, emanate from an area of the seabed off West Svalbard that has become 1 degrees C warmer over the past 30 years. The distribution of the plumes, lying close to and upslope from the present upper limit of the methane hydrate stability zone, indicates that methane in the plumes could come from warming-induced hydrate dissociation, a process commonly invoked as contributing to rapid climate change. We used numerical modeling to investigate the response of hydrate beneath the seabed to changes in bottom-water temperature over periods of up to 1000 years B. P. The delay between the onset of warming and emission of gas, resulting from the time taken for thermal diffusion, hydrate dissociation, and gas...
Tipo: Text Palavras-chave: Methane hydrate; Gas emission; Arctic warming; Geological controls; Thermal history.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00137/24779/22838.pdf
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