Organic carbon isotope ratio (δ13C) of Arctic Amerasian Continental shelf sediments

A. S. Naidu, L. W. Cooper, B. P. Finney, R. W. Macdonald, C. Alexander, Igor Petrovich Semiletov

Research output: Contribution to journalArticle

127 Citations (Scopus)

Abstract

Organic matter origins are inferred from carbon isotope ratios (δ13C) in recent continental shelf sediments and major rivers from 465 locations from the north Bering-Chukchi-East Siberian-Beaufort Sea, Arctic Amerasia. Generally, there is a cross-shelf increase in δ13C, which is due to progressive increased contribution seaward of marine-derived organic carbon to surface sediments. This conclusion is supported by the correlations between sediment δ13C. OC/N, and δ15N. The sources of total organic carbon (TOC) to the Amerasian margin sediments are primarily from marine water-column phytoplankton and terrigenous C3 plants constituted of tundra taiga and angiosperms. In contrast to more temperate regions, the source of TOC from terrigenous C4 and CAM plants to the study area is probably insignificant because these plants do not exist in the northern high latitudes. The input of carbon to the northern Alaskan shelf sediments from nearshore kelp community (Laminaria solidungula) is generally insignificant as indicated by the absence of high sediment δ13C values (-16.5 to -13.6‰) which are typical of the macrophytes. Our study suggests that the isotopic composition of sediment TOC has potential application in reconstructing temporal changes in delivery and accumulation of organic matter resulting from glacial-interglacial changes in sea level and environments. Furthermore, recycling and advection of the extensive deposits of terrestrially derived organic matter from land, or the wide Amerasian margin, could be a mechanism for elevating total CO2 and pCO2 in the Arctic Basin halocline.

Original languageEnglish
Pages (from-to)522-532
Number of pages11
JournalInternational Journal of Earth Sciences
Volume89
Issue number3
DOIs
Publication statusPublished - 1 Dec 2000
Externally publishedYes

Fingerprint

shelf sediment
carbon isotope ratio
continental shelf
organic carbon
total organic carbon
sediment
organic matter
halocline
C3 plant
tundra
angiosperm
interglacial
boreal forest
advection
isotopic composition
recycling
water column
phytoplankton
sea level
carbon

Keywords

  • Artic Amerisian shelf
  • Sediment carbon and nitrogen isotopes

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

Cite this

Organic carbon isotope ratio (δ13C) of Arctic Amerasian Continental shelf sediments. / Naidu, A. S.; Cooper, L. W.; Finney, B. P.; Macdonald, R. W.; Alexander, C.; Semiletov, Igor Petrovich.

In: International Journal of Earth Sciences, Vol. 89, No. 3, 01.12.2000, p. 522-532.

Research output: Contribution to journalArticle

Naidu, A. S. ; Cooper, L. W. ; Finney, B. P. ; Macdonald, R. W. ; Alexander, C. ; Semiletov, Igor Petrovich. / Organic carbon isotope ratio (δ13C) of Arctic Amerasian Continental shelf sediments. In: International Journal of Earth Sciences. 2000 ; Vol. 89, No. 3. pp. 522-532.
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