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Limnol. Oceanogr., 51(2), 2006, 10451053 2006, by the American Society of Limnology and Oceanography, Inc.
 

Summary: 1045
Limnol. Oceanogr., 51(2), 2006, 10451053
2006, by the American Society of Limnology and Oceanography, Inc.
Radiocarbon analysis of neutral sugars in high-molecular-weight dissolved
organic carbon: Implications for organic carbon cycling
Daniel J. Repeta
Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole,
Massachusetts 02543
Lihini I. Aluwihare
Geosciences Research Division, Scripps Institution of Oceanography, La Jolla, California 92037
Abstract
We used compound-specific natural-abundance radiocarbon analyses of neutral sugars to study carbon cycling of
high-molecular-weight (HMW) dissolved organic carbon (DOC) at two sites in the North Pacific Ocean. Sugars
released from HMW DOC by acid hydrolysis were purified by high-pressure liquid chromatography and analyzed
for radiocarbon content via accelerator mass spectrometry. The seven most abundant sugars recovered from HMW
DOC have similar radiocarbon values, supporting the hypothesis that these sugars are incorporated into a common
family of polysaccharides. Neutral sugar 14
C values from surface waters collected in 1999 and 2001 are 89
13 and 57 6, respectively; these values are much more enriched in radiocarbon than those found in previous
studies that used operationally defined carbohydrate fractions. Radiocarbon values for HMW DOC neutral sugars

  

Source: Aluwihare, Lihini - Geosciences Research Division, Scripps Institution of Oceanography

 

Collections: Geosciences