Geomorphologic controls on the age of particulate organic carbon from small mountainous and upland rivers
Identifieur interne : 001070 ( Main/Exploration ); précédent : 001069; suivant : 001071Geomorphologic controls on the age of particulate organic carbon from small mountainous and upland rivers
Auteurs : Elana L. Leithold [États-Unis] ; Neal E. Blair [États-Unis] ; David W. Perkey [États-Unis]Source :
- Global Biogeochemical Cycles [ 0886-6236 ] ; 2006-09.
Abstract
To assess the role that erosion processes play in governing the character of particulate organic carbon (POC) discharged from small mountainous and upland rivers, a suite of watersheds from Oregon, California, and New Zealand was investigated. The rivers share similar geology, tectonic setting, and climate, but have sediment yields that range over 3 orders of magnitude. The 14C age of the POC loads is highly correlated with sediment yield. Carbon isotope mass balances reveal that the rivers carry bimodal mixtures of modern‐plant‐ and ancient‐rock‐derived OC. At lower yields, modern plant OC dominates the material delivered to the river by sheetwash and shallow landsliding. With increasing yield, a progressively larger part of the POC is contributed directly from bedrock erosion via deep gully incision. Our results support the inference that active margin watersheds are important sources of aged POC to the ocean.
Url:
DOI: 10.1029/2005GB002677
Affiliations:
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Leithold</name><affiliation wicri:level="1"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Marine, Earth, and Atmospheric Sciences, North Carolina State University, North Carolina, Raleigh</wicri:regionArea><wicri:noRegion>Raleigh</wicri:noRegion></affiliation><affiliation wicri:level="1"><country wicri:rule="url">États-Unis</country></affiliation></author><author><name sortKey="Blair, Neal E" sort="Blair, Neal E" uniqKey="Blair N" first="Neal E." last="Blair">Neal E. Blair</name><affiliation wicri:level="1"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Marine, Earth, and Atmospheric Sciences, North Carolina State University, North Carolina, Raleigh</wicri:regionArea><wicri:noRegion>Raleigh</wicri:noRegion></affiliation></author><author><name sortKey="Perkey, David W" sort="Perkey, David W" uniqKey="Perkey D" first="David W." last="Perkey">David W. Perkey</name><affiliation wicri:level="1"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Virginia Institute of Marine Sciences, College of William and Mary, Virginia, Gloucester Point</wicri:regionArea><wicri:noRegion>Gloucester Point</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j">Global Biogeochemical Cycles</title><title level="j" type="abbrev">Global Biogeochem. Cycles</title><idno type="ISSN">0886-6236</idno><idno type="eISSN">1944-9224</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><date type="published" when="2006-09">2006-09</date><biblScope unit="volume">20</biblScope><biblScope unit="issue">3</biblScope><biblScope unit="page" from="n/a">n/a</biblScope><biblScope unit="page" to="n/a">n/a</biblScope></imprint><idno type="ISSN">0886-6236</idno></series><idno type="istex">D52112F0390F4BD1E88FB0D7A651A0C425CDCD7E</idno><idno type="DOI">10.1029/2005GB002677</idno><idno type="ArticleID">2005GB002677</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0886-6236</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">To assess the role that erosion processes play in governing the character of particulate organic carbon (POC) discharged from small mountainous and upland rivers, a suite of watersheds from Oregon, California, and New Zealand was investigated. The rivers share similar geology, tectonic setting, and climate, but have sediment yields that range over 3 orders of magnitude. The 14C age of the POC loads is highly correlated with sediment yield. Carbon isotope mass balances reveal that the rivers carry bimodal mixtures of modern‐plant‐ and ancient‐rock‐derived OC. At lower yields, modern plant OC dominates the material delivered to the river by sheetwash and shallow landsliding. With increasing yield, a progressively larger part of the POC is contributed directly from bedrock erosion via deep gully incision. Our results support the inference that active margin watersheds are important sources of aged POC to the ocean.</div></front></TEI><affiliations><list><country><li>États-Unis</li></country></list><tree><country name="États-Unis"><noRegion><name sortKey="Leithold, Elana L" sort="Leithold, Elana L" uniqKey="Leithold E" first="Elana L." last="Leithold">Elana L. Leithold</name></noRegion><name sortKey="Blair, Neal E" sort="Blair, Neal E" uniqKey="Blair N" first="Neal E." last="Blair">Neal E. Blair</name><name sortKey="Leithold, Elana L" sort="Leithold, Elana L" uniqKey="Leithold E" first="Elana L." last="Leithold">Elana L. Leithold</name><name sortKey="Perkey, David W" sort="Perkey, David W" uniqKey="Perkey D" first="David W." last="Perkey">David W. Perkey</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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