Stable carbon and nitrogen isotope ratios of sediment in the gulf of Thailand: Evidence for understanding of marine environment

Meksumpun, Shettapong; Meksumpun, Charumas; Hoshika, Akira; Mishima, Yasuo; Tanimoto, Terumi

doi:10.1016/j.csr.2005.04.009

Cited by 29 publications

(22 citation statements)

References 31 publications

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“…This difference could be explained as the following points: (1) the lower GOT has more significant input of soot-BC compared to the upper GOT (see below), which is served as the additional BC source and largely uncoupled from land-based sedimentary OM, resulting in the higher slope therein; (2) the different sedimentary OM pool in the upper and lower Gulf. Since phytoplankton production was reported to be a major contributor to the sedimentary OM pools in the lower Gulf (e.g., Meksumpun et al, 2005), the less refractory nature of marine OM thus may also be partly related to the varying slope observed in the lower GOT.…”

Section: Relationships Between Bc Toc and Sediment Grain Size And Pomentioning

confidence: 99%

Distribution, input pathway and mass inventory of black carbon in sediments of the Gulf of Thailand, SE Asia

Shi

Bai

et al. 2016

Estuarine, Coastal and Shelf Science

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a b s t r a c tThe coastal margins around Southeast Asia (SE Asia) may serve as an ideal location to study the sourcesink process of sedimentary black carbon (BC) because SE Asia has been identified as one of the major BC emission source regions in the world. This study provides an extensive picture of recent regional-scale sedimentary BC sequestration in the Gulf of Thailand (GOT), a tropical marine system in SE Asia. Generally, the sedimentary BC concentrations (0.07e3.99 mg/g) were in the low to moderate ranges of those obtained in other coastal sediments around the world. Regional variability of the BC and its correlation with the sediment grain size and total organic carbon (TOC) content indicated a general hydrodynamic constraint on BC occurrence in the lower Gulf in contrast to the upper Gulf with a more source dependence due to the direct land-based input. BC/TOC% values and the varied BC components (char and soot), as well as their correlations suggested that char was the predominant constituents of sedimentary BC both in the upper and lower Gulf, which could be mainly derived from biomass burning and entered into the nearshore region through direct fluvial transport and surface run-off. The estimated BC burial flux (~212 mg/cm 2 /y) and mass inventory (~200 Gg/y) in the GOT on the hundred-year timescale were of the same order of magnitude compared with other oceanic margins, and thus the tropical shelf sediments from SE Asia could serve as an important sink of land-emitted BC.

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Section: Relationships Between Bc Toc and Sediment Grain Size And Pomentioning

confidence: 99%

Distribution, input pathway and mass inventory of black carbon in sediments of the Gulf of Thailand, SE Asia

Shi

Bai

et al. 2016

Estuarine, Coastal and Shelf Science

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“…It may also be due to the presence of ancient carbon (kerogen) and primary production. In the Gulf of Thailand, isotopic enrichment due to the presence of algae has been previously detected (Meksumpun et al 2005). Studies in the Adriatic Sea using organic carbon, total nitrogen, and C/N ratio and isotope analyses, δ 13 C and δ 15 N, in surface sediments and suspended particulate matter identified possible sources of OM (Tesi et al 2007).…”

mentioning

confidence: 99%

Carbon and nitrogen stable isotope compositions of organic matter in marine sediment cores from the Abrolhos region: indicators of sources and preservation

Souza¹,

Costa²,

Azevedo³

et al. 2013

Geochim. Bras.

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Organic matter is an important source of information on the transport and consolidation processes of sediments. In this study, the isotopes of carbon and nitrogen (δ 13 C and δ 15 N), total organic carbon (TOC), total nitrogen, carbon/nitrogen (C/N) ratio, and 13 C-NMR were utilized to understand the origin and behavior of organic material in the Abrolhos region. It were analyzed nine sediment cores taken from a mangrove, a channel between the mainland and the coral reefs. The average value of the C/N ratio in the mangrove was 18, which characterizes purely terrigenous areas. For the reefs, the average value of the C/N ratio was 8,which is characteristic of marine and coastal regions. For the sediment cores taken from the channel, the average value of the C/N ratio was 10, a typical value of areas under the influence of mangroves. The mean values of δ 13 C were -26.9‰ for the mangrove, -20.7‰ for the channel region, and -18.2‰ for the reefs. This variation is associated with the main source of organic matter, which in the mangrove is derived from vascular plants (mainly C3 metabolism) and for the reefs is derived from phytoplankton. The 13 C-NMR results corroborate the isotopic and elemental analyses. The analyses of these cores indicate that the anthropogenic influence on the coast did not significantly alter the composition of the material that has been deposited in about the last 80 years in the region of study.

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“…The negative values for δ 13 C and δ 15 N seen in U3 and U4 suggest that little organic matter was supplied from the marine environment, in comparison with U1. The negative values of δ 13 C, ranging from −25.5‰ to −30.0‰, and values of δ 15 N less than 3‰, also indicate the terrestrial end-member in continental shelf sediments [46,47], compatible with the lowest value of meteoric 10 Be (U4). These results are correlated with the glacially sculpted streamline on the sea floor, reported from analyses of multibeam data and the petrologic composition of terrigenous grains on the Antarctic Peninsula [36].…”

Section: Depositional Environmentsmentioning

confidence: 92%

Clay Mineralogical Characteristics of Sediments Deposited during the Late Quaternary in the Larsen Ice Shelf B Embayment, Antarctica

et al. 2019

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Variations in grain size, clay mineral composition, and stable isotopes (δ13C and δ15N) are closely linked to the sedimentary facies that reflect mineralogical and geochemical modification during the retreat and advance of the Larsen ice shelf. A whole round core of marine sediment (EAP13-GC17, 236 cm below the sea floor) was collected on the northwestern Larsen B embayment of the Antarctic Peninsula during a marine geological expedition (the ARA13 Cruise Expedition by the Korea Polar Research Institute, 2013). Four sedimentary facies (U1–U4) were clearly distinguishable: bioturbated sandy mud (open marine, U1), laminated sandy mud (sub–floating ice shelf, U2), sandy clay aggregates (deglacial, U3), and muddy diamictons (sub-glacial, U4), as well as interbedded silty. Clay minerals, including smectite, chlorite, illite, and kaolinite, were detected throughout the core. An increase in the clay mineral ratio of smectite/(illite + chlorite) was clearly observed in the open marine condition, which was strongly indicated by both a heavier isotopic composition of δ13C and δ15N (−24.4‰ and 4.3‰, respectively), and an abrupt increase in 10Be concentration (~30 times). An increase in the average values of the crystal packet thickness of illite (~1.5 times) in U1 also indicated sediments transported in open marine conditions. Based on the clay mineral composition in U1, the sediments are likely to have been transported from the Weddell Sea. The clay mineralogical assessments conducted in this region have significant implications for our understanding of paleodepositional environments.

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Stable carbon and nitrogen isotope ratios of sediment in the gulf of Thailand: Evidence for understanding of marine environment

Cited by 29 publications

References 31 publications

Distribution, input pathway and mass inventory of black carbon in sediments of the Gulf of Thailand, SE Asia

Distribution, input pathway and mass inventory of black carbon in sediments of the Gulf of Thailand, SE Asia

Carbon and nitrogen stable isotope compositions of organic matter in marine sediment cores from the Abrolhos region: indicators of sources and preservation

Clay Mineralogical Characteristics of Sediments Deposited during the Late Quaternary in the Larsen Ice Shelf B Embayment, Antarctica

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