Late Pleistocene and Early Holocene Climate of Ny-Alesund, Svalbard (Norway): A Study based on Biological Proxies

Singh, Vartika; Farooqui, Anjum; Mehrotra, Naresh C.; Singh, Dhruv Sen; Tewari, Rajni; Jha, Neerja; Kar, Ratan

doi:10.1007/s12594-011-0079-3

Cited by 8 publications

(1 citation statement)

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“…It is known for its strong hydrological, sedimentological and biological gradients along the axis26. Previous records from the region2728 are limited and a knowledge gap exists. Results from the spatial variability of SOM in surface sediments will also form the groundwork for high-resolution long core studies from the region.…”

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confidence: 99%

Evidence of Anomalously Low δ13C of Marine Organic Matter in an Arctic Fjord

Kumar

Tiwari

Nagoji

et al. 2016

Sci Rep

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Accurate estimation of relative carbon deposition (marine vs. terrestrial) is required for understanding the global carbon budget, particularly in the Arctic region, which holds disproportionate importance with respect to global carbon cycling. Although the sedimentary organic matter (SOM) concentration and its isotopic composition are important tools for such calculations, uncertainties loom over estimates provided by organic-geochemical bulk parameters. We report carbon and nitrogen concentrations and isotopes (δ13C and δ15N) of SOM at an Arctic fjord namely Kongsfjorden. We find that the bound inorganic nitrogen (ammonium attached to the clay minerals) forms a significant proportion of total nitrogen concentration (~77% in the inner fjord to ~24% in the outer part). On removing the bound nitrogen, the C/N ratio shows that the SOM in the inner fjord is made up of terrestrial carbon while the outer fjord shows mixed marine-terrestrial signal. We further show that the marine organic matter is unusually more depleted in 13C (~−24‰) than the terrestrial organic matter (~−22.5‰). This particular finding also helps explain high δ13C values of SOM as noted by earlier studies in central Arctic sediments despite a high terrestrial contribution.

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confidence: 99%