Widespread influence of resuspended sediments on oceanic particulate organic carbon: Insights from radiocarbon and aluminum contents in sinking particles

Particulate organic carbon (POC) in the ocean often exhibits more depleted radiocarbon contents (lower Delta C-14 values) than expected if its sole source were POC recently synthesized by primary production and export from the overlying surface waters. An examination of available Delta C-14 data set...

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Bibliographic Details
Published in:Global Biogeochemical Cycles
Main Authors: Hwang, J, Druffel, ERM, Eglinton, TI
Other Authors: 해양대학원, 10160028
Format: Article in Journal/Newspaper
Language:English
Published: AMER GEOPHYSICAL UNION 2010
Subjects:
EQUATORIAL PACIFIC-OCEAN
MIDDLE ATLANTIC BIGHT
DEEP-WATER COLUMN
CONTINENTAL-SHELF
NORTHEAST PACIFIC
LATERAL PARTICLE
COMPOUND CLASSES
ARCTIC-OCEAN
JAPAN SEA
TEMPORAL VARIABILITY
PACIFIC-OCEAN
DISSOLVED ALUMINUM
TIME-SERIES
ROSS SEA
MATTER
Arctic
Arctic Ocean
Pacific
Ross Sea
Online Access:https://oasis.postech.ac.kr/handle/2014.oak/25219
https://doi.org/10.1029/2010GB003802
Description
Summary:Particulate organic carbon (POC) in the ocean often exhibits more depleted radiocarbon contents (lower Delta C-14 values) than expected if its sole source were POC recently synthesized by primary production and export from the overlying surface waters. An examination of available Delta C-14 data sets for sinking POC show that this phenomenon is both common and globally widespread. Also, a strong correlation is found to exist between Delta C-14 values of organic carbon and aluminum content in sinking particles that is consistent over a range of oceanic settings. Together, these findings imply that aged organic carbon associated with lithogenic material from sediment resuspension is responsible for the observed low Delta C-14 values as opposed to other processes such as incorporation of dissolved inorganic carbon or dissolved organic carbon into POC at depth. An estimate based on POC flux- weighted Delta C-14 values shows that about 35% of sinking POC at the locations studied is derived from resuspended sediment. Our results suggest that resuspension of sediment and its subsequent lateral transport is an important component of the oceanic carbon cycle and should be considered in models of oceanic carbon export and burial. X 1 1 25 26 scie scopus

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