期刊
JOURNAL OF MARINE SCIENCE AND ENGINEERING
卷 10, 期 11, 页码 -出版社
MDPI
DOI: 10.3390/jmse10111589
关键词
permafrost; Arctic Ocean; stable carbon isotopes; nitrogen; sediment chemistry; sediment dynamics; Beaufort Sea; grain size
资金
- Helmholtz Association [VH-NG-801]
- Daimler and Benz Foundation [32-02/15]
- Universitat Hamburg [EXC177]
Increasing coastal erosion rates in the Arctic lead to a greater release of sediments and organic matter into the coastal zone. Research conducted on sediment samples from the nearshore area showed higher organic carbon content. The study suggests that degradation of organic matter and separation of carbon pools occur on land and continue in the nearshore zone.
Increasing arctic coastal erosion rates imply a greater release of sediments and organic matter into the coastal zone. With 213 sediment samples taken around Herschel Island-Qikiqtaruk, Canadian Beaufort Sea, we aimed to gain new insights on sediment dynamics and geochemical properties of a shallow arctic nearshore zone. Spatial characteristics of nearshore sediment texture (moderately to poorly sorted silt) are dictated by hydrodynamic processes, but ice-related processes also play a role. We determined organic matter (OM) distribution and inferred the origin and quality of organic carbon by C/N ratios and stable carbon isotopes delta C-13. The carbon content was higher offshore and in sheltered areas (mean: 1.0 wt.%., S.D.: 0.9) and the C/N ratios also showed a similar spatial pattern (mean: 11.1, S.D.: 3.1), while the delta C-13 (mean: -26.4 parts per thousand VPDB, S.D.: 0.4) distribution was more complex. We compared the geochemical parameters of our study with terrestrial and marine samples from other studies using a bootstrap approach. Sediments of the current study contained 6.5 times and 1.8 times less total organic carbon than undisturbed and disturbed terrestrial sediments, respectively. Therefore, degradation of OM and separation of carbon pools take place on land and continue in the nearshore zone, where OM is leached, mineralized, or transported beyond the study area.
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