Carbon isotope ratios of organic compound fractions in oceanic suspended particles
نویسندگان
چکیده
[1] To study cycling of organic fractions in the ocean, relative abundances and radioand stable-carbon isotope measurements of total lipid extract, acid-soluble, and acidinsoluble fractions of suspended particulate organic carbon (POC) were made. Changes in relative abundances occurred mostly in the upper 1000 m of the water column, with a decrease in total lipid extract and the acid-soluble fraction and an increase in the acid-insoluble fraction with increasing depth. We found lower DC values for total lipid extract and the acid-insoluble fraction than for the acid-soluble fraction, which is consistent with the previous suggestion of incorporation of dissolved organic carbon and/or resuspended sediment to POC (Druffel and Williams, 1990; Sherrell et al., 1998). The DC values of these fractions in a given organic carbon pool must be understood in terms of acquisition of C-depleted carbon from other carbon pools in addition to aging within the reservoir. Citation: Hwang, J., and E. R. M. Druffel (2006), Carbon isotope ratios of organic compound fractions in oceanic suspended particles, Geophys. Res. Lett., 33, L23610, doi:10.1029/2006GL027928.
منابع مشابه
Blank Correction for ∆14c Measurements in Organic Compound Classes of Oceanic Particulate Matter
Contaminant carbon (blank carbon) was studied for its impact on the carbon isotope measurements (∆14C and δ13C) of 3 organic compound classes of oceanic particulate organic matter. Two methods of blank correction and associated uncertainties were studied. First, the carbon blanks were quantified manometrically and the isotope ratios of the blank carbon were measured directly. Second, the isotop...
متن کاملStable isotopes measurements reveal dual carbon pools contributing to organic matter enrichment in marine aerosol
Stable carbon isotope ratios in marine aerosol collected over the Southern Indian Ocean revealed δ13C values ranging from -20.0‰ to -28.2‰. The isotope ratios exhibited a strong correlation with the fractional organic matter (OM) enrichment in sea spray aerosol. The base-level isotope ratio of -20.0‰ is characteristic of an aged Dissolved Organic Matter (DOM) pool contributing a relatively homo...
متن کاملCharacteristics and sources of carbonaceous aerosols from Shanghai, China
An intensive investigation of carbonaceous PM2.5 and TSP (total suspended particles) from Pudong (China) was conducted as part of the MIRAGE-Shanghai (Megacities Impact on Regional and Global Environment) experiment in 2009. Data for organic and elemental carbon (OC and EC), organic species, including C17 to C40 n-alkanes and 17 polycyclic aromatic hydrocarbons (PAHs), and stable carbon isotope...
متن کاملMonitoring Microbial Dechlorination of Tetrachloroethene (PCE) in Groundwater Using Compound-Specific Stable Carbon Isotope Ratios: Microcosm and Field Studies
The determination of compound-specific stable isotope ratios is a promising new tool to assess biodegradation of organic compounds in groundwater. In this study, the occurrence of carbon isotope fractionation during dechlorination of tetrachloroethene (PCE) to ethene was evaluated in a PCE-contaminated aquifer and in a microcosm that was based on aquifer material from the site. In the microcosm...
متن کاملTransport of organic carbon from the California coast to the slope region: A study of DC and DC signatures of organic compound classes
[1] Surface sediments along a transect from an abyssal site in the northeastern Pacific (Station M, 34 500N, 123 000W) to a small mountainous river on the California coast (Santa Clara River) were studied to investigate the sources and cycling of organic matter on the continental margin. Sediment samples were separated into organic compound fractions (extractable lipids, amino acids (THAA), car...
متن کامل