Project

General

Profile

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            schemename="dnet:result_subject">SUSPENDED SEDIMENT TRANSPORT</subject>
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            schemename="dnet:result_subject">NORTHWESTERN MEDITERRANEAN SEA</subject>
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            schemename="dnet:result_subject">Ciències de la terra</subject>
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            schemename="dnet:result_subject">Marges continentals</subject>
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            schemename="dnet:result_subject">Environmental sciences</subject>
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        <subject classid="keyword" classname="keyword" schemeid="dnet:result_subject"
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            schemename="dnet:result_subject">UPPER MONTEREY CANYON</subject>
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            schemename="dnet:result_subject">Continental margins</subject>
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            schemename="dnet:result_subject">Earth sciences</subject>
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            schemename="dnet:result_subject">Ciències ambientals</subject>
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        <subject classid="keyword" classname="keyword" schemeid="dnet:result_subject"
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            schemename="dnet:result_subject">SUBMARINE CANYONS</subject>
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        <title classid="main title" classname="main title" schemeid="dnet:dataCite_title"
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            schemename="dnet:dataCite_title">Reexposure and advection of C-14-depleted organic
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            carbon from old deposits at the upper continental slope</title>
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        <dateofacceptance>2010-01-01</dateofacceptance>
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        <publisher>AMER GEOPHYSICAL UNION, 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA</publisher>
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        <journal issn="0886-6236" eissn="" lissn="">Global Biogeochemical Cycles</journal>
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        <description>Outcrops of old strata at the shelf edge resulting from erosive gravity-driven
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            flows have been globally described on continental margins. The reexposure of old strata
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            allows for the reintroduction of aged organic carbon (OC), sequestered in marine
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            sediments for thousands of years, into the modern carbon cycle. This pool of reworked
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            material represents an additional source of C-14-depleted organic carbon supplied to the
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            ocean, in parallel with the weathering of fossil organic carbon delivered by rivers from
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            land. To understand the dynamics and implications of this reexposure at the shelf edge,
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            a biogeochemical study was carried out in the Gulf of Lions (Mediterranean Sea) where
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            erosive processes, driven by shelf dense water cascading, are currently shaping the
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            seafloor at the canyon heads. Mooring lines equipped with sediment traps and current
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            meters were deployed during the cascading season in the southwestern canyon heads,
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            whereas sediment cores were collected along the sediment dispersal system from the
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            prodelta regions down to the canyon heads. Evidence from grain-size, X-radiographs and
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            Pb-210 activity indicate the presence in the upper slope of a shelly-coarse surface
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            stratum overlying a consolidated deposit. This erosive discontinuity was interpreted as
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            being a result of dense water cascading that is able to generate sufficient shear stress
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            at the canyon heads to mobilize the coarse surface layer, eroding the basal strata. As a
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            result, a pool of aged organic carbon (Delta C-14 = -944.5 +/- 24.7%; mean age 23,650
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            +/- 3,321 ybp) outcrops at the modern seafloor and is reexposed to the contemporary
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            carbon cycle. This basal deposit was found to have relatively high terrigenous organic
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            carbon (lignin = 1.48 +/- 0.14 mg/100 mg OC), suggesting that this material was
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            deposited during the last low sea-level stand. A few sediment trap samples showed
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            anomalously depleted radiocarbon concentrations (Delta C-14 = -704.4 +/- 62.5%) relative
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            to inner shelf (Delta C-14 = -293.4 +/- 134.0%), mid-shelf (Delta C-14 = -366.6 +/-
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            51.1%), and outer shelf (Delta C-14 = -384 +/- 47.8%) surface sediments. Therefore,
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            although the major source of particulate material during the cascading season is
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            resuspended shelf deposits, there is evidence that this aged pool of organic carbon can
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            be eroded and laterally advected downslope.</description>
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        <source>In: Global Biogeochemical Cycles, vol. 24 article n. GB4002. AMER GEOPHYSICAL UNION,
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            2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA, 2010.</source>
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        <source>Global Biogeochemical Cycles</source>
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                <title>Hotspot Ecosystem Research and Man's Impact on European seas</title>
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                    schemename="dnet:dataCite_title">Reexposure and advection of14C-depleted organic
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                    organic carbon from old deposits at the upper continental slope</title>
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                    schemename="dnet:dataCite_title">Reexposure and advection of 14C-depleted
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                    organic carbon from old deposits at the upper continental slope</title>
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                    schemename="dnet:dataCite_title">Reexposure and advection of 14C-depleted
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                    organic carbon from old deposits at the upper continental slope</title>
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                    schemename="dnet:dataCite_title">Reexposure and advection of C-14-depleted
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                    organic carbon from old deposits at the upper continental slope</title>
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