期刊
GEOPHYSICAL RESEARCH LETTERS
卷 42, 期 19, 页码 8106-8113出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2015GL065052
关键词
submarine canyon; sediment accumulation rates; continental margins; bottom trawling; anthropogenic impacts
资金
- HERMIONE project (7FP) [226354, 287600]
- PERSEUS project (7FP) [226354, 287600]
- Generalitat de Catalunya [2014 SGR-1642, 2014 SGR-1356]
- ICREA Academia award
- Gledden Visiting Fellowship - Institute of Advanced Studies at the University of Western Australia
Previous studies conducted in La Fonera (Palamos) submarine canyon (NW Mediterranean) found that trawling activities along the canyon flanks cause resuspension and transport of sediments toward the canyon axis. Pb-210 chronology supported by Cs-137 dating applied to a sediment core collected at 1750m in 2002 suggested a doubling of the sediment accumulation rate since the 1970s, coincident with the rapid industrialization of the local trawling fleet. The same canyon area has been revisited a decade later, and new data are consistent with a sedimentary regime shift during the 1970s and also suggest that the accumulation rate during the last decade could be greater than expected, approaching 2.4cmyr(-1) (compared to 0.25cmyr(-1) pre-1970s). These results support the hypothesis that commercial bottom trawling can substantially affect sediment dynamics and budgets on continental margins, eventually initiating the formation of anthropogenic depocenters in submarine canyon environments.
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