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<oaf:result>
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<subject classid="keyword" classname="keyword" schemeid="dnet:result_subject"
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schemename="dnet:result_subject">SUSPENDED SEDIMENT TRANSPORT</subject>
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<subject classid="keyword" classname="keyword" schemeid="dnet:result_subject"
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schemename="dnet:result_subject">NORTHWESTERN MEDITERRANEAN SEA</subject>
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<subject classid="keyword" classname="keyword" schemeid="dnet:result_subject"
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schemename="dnet:result_subject">Ciències de la terra</subject>
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<subject classid="keyword" classname="keyword" schemeid="dnet:result_subject"
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schemename="dnet:result_subject">Marges continentals</subject>
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<subject classid="keyword" classname="keyword" schemeid="dnet:result_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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<subject classid="keyword" classname="keyword" schemeid="dnet:result_subject"
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schemename="dnet:result_subject">Continental margins</subject>
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<subject classid="keyword" classname="keyword" schemeid="dnet:result_subject"
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schemename="dnet:result_subject">Earth sciences</subject>
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<subject classid="keyword" classname="keyword" schemeid="dnet:result_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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<resulttype classid="publication" classname="publication" schemeid="dnet:result_typologies"
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schemename="dnet:result_typologies"/>
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<language classid="eng" classname="English" schemeid="dnet:languages"
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schemename="dnet:languages"/>
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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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<fullname>Tesi, Tommaso</fullname>
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<fullname>Langone, Leonardo</fullname>
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<ranking>10</ranking>
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<fullname>Heussner, Serge</fullname>
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provenanceaction="sysimport:crosswalk:repository">
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<ranking>7</ranking>
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<fullname>Durrieu de Madron, Xavier</fullname>
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provenanceaction="sysimport:crosswalk:repository">
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<ranking>4</ranking>
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<fullname>Puig, Pere</fullname>
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<ranking>6</ranking>
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<fullname>Nittrouer, Charles A.</fullname>
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provenanceaction="sysimport:crosswalk:repository">
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<ranking>13</ranking>
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<fullname>Fabres, Joan</fullname>
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</rel>
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provenanceaction="sysimport:crosswalk:repository">
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<ranking>5</ranking>
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<fullname>Canals, Miquel</fullname>
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<ranking>12</ranking>
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<fullname>Drexler, Tina M.</fullname>
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<ranking>9</ranking>
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<fullname>Palanques, Albert</fullname>
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</rel>
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provenanceaction="sysimport:crosswalk:repository">
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<ranking>14</ranking>
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<fullname>Miserocchi, Stefano</fullname>
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provenanceaction="sysimport:crosswalk:repository">
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<ranking>8</ranking>
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<fullname>Calafat, Antoni</fullname>
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provenanceaction="sysimport:crosswalk:repository">
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<ranking>11</ranking>
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<fullname>Davies, Maureen H.</fullname>
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provenanceaction="sysimport:crosswalk:repository">
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>corda_______::5917ccec52c3c8e4b329e72e30d84cd6</to>
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<code>226354</code>
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<acronym>HERMIONE</acronym>
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<title>Hotspot Ecosystem Research and Man's Impact on European seas</title>
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<contracttype classid="CP" classname="Collaborative project"
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schemeid="ec:FP7contractTypes" schemename="ec:FP7contractTypes"/>
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<funding>
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<funder id="ec__________::EC" shortname="EC" name="European Commission"
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jurisdiction="EU"/>
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<ranking>2</ranking>
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<fullname>Goñi, Miguel A.</fullname>
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<children>
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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 of14C-depleted organic
|
240
|
carbon from old deposits at the upper continental slope</title>
|
241
|
<dateofacceptance>2010-01-01</dateofacceptance>
|
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<resulttype classid="publication" classname="publication"
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schemeid="dnet:result_typologies" schemename="dnet:result_typologies"/>
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</result>
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<result objidentifier="od______2367::e38438e6dffef72da515edd14b1266cc">
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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
|
248
|
organic carbon from old deposits at the upper continental slope</title>
|
249
|
<dateofacceptance>2010-01-01</dateofacceptance>
|
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|
<publisher>AMER GEOPHYSICAL UNION, 2000 FLORIDA AVE NW, WASHINGTON, DC 20009
|
251
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USA</publisher>
|
252
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<resulttype classid="publication" classname="publication"
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schemeid="dnet:result_typologies" schemename="dnet:result_typologies"/>
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</result>
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<result objidentifier="od______1106::9693c0fbd434e6fdfac6cb83bdf5556b">
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256
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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 14C-depleted
|
258
|
organic carbon from old deposits at the upper continental slope</title>
|
259
|
<dateofacceptance>2010-01-01</dateofacceptance>
|
260
|
<publisher>American Geophysical Union</publisher>
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<resulttype classid="publication" classname="publication"
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schemeid="dnet:result_typologies" schemename="dnet:result_typologies"/>
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<result objidentifier="od______1106::2a6fbfb2df258f930f8e77c2ac7d05d3">
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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 14C-depleted
|
267
|
organic carbon from old deposits at the upper continental slope</title>
|
268
|
<dateofacceptance>2010-01-01</dateofacceptance>
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<publisher>American Geophysical Union</publisher>
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<resulttype classid="publication" classname="publication"
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schemeid="dnet:result_typologies" schemename="dnet:result_typologies"/>
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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
|
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|
organic carbon from old deposits at the upper continental slope</title>
|
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<dateofacceptance>2010-10-13</dateofacceptance>
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<publisher>American Geophysical Union</publisher>
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