Arctic deltaic lake sediments as recorders of fluvial organic matter deposition
Vonk, Jorien E.
Dickens, Angela F.
Hussain, Zainab A.
Zipper, Samuel C.
Holmes, Robert M.
Montlucon, Daniel B.
Eglinton, Timothy I.
MetadataShow full item record
Arctic deltas are dynamic and vulnerable regions that play a key role in land-ocean interactions and the global carbon cycle. Delta lakes may provide valuable historical records of the quality and quantity of fluvial fluxes, parameters that are challenging to investigate in these remote regions. Here we study lakes from across the Mackenzie Delta, Arctic Canada, that receive fluvial sediments from the Mackenzie River when spring flood water levels rise above natural levees. We compare downcore lake sediments with suspended sediments collected during the spring flood, using bulk (% organic carbon, % total nitrogen, δ13C, Δ14C) and molecular organic geochemistry (lignin, leaf waxes). High-resolution age models (137Cs, 210Pb) of downcore lake sediment records (n = 11) along with lamina counting on high-resolution radiographs show sediment deposition frequencies ranging between annually to every 15 years. Down-core geochemical variability in a representative delta lake sediment core is consistent with historical variability in spring flood hydrology (variability in peak discharge, ice jamming, peak water levels). Comparison with earlier published Mackenzie River depth profiles shows that (i) lake sediments reflect the riverine surface suspended load, and (ii) hydrodynamic sorting patterns related to spring flood characteristics are reflected in the lake sediments. Bulk and molecular geochemistry of suspended particulate matter from the spring flood peak and lake sediments are relatively similar showing a mixture of modern higher-plant derived material, older terrestrial permafrost material, and old rock-derived material. This suggests that deltaic lake sedimentary records hold great promise as recorders of past (century-scale) riverine fluxes and may prove instrumental in shedding light on past behavior of arctic rivers, as well as how they respond to a changing climate.
© The Author(s), 2016. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Frontiers in Earth Science 4 (2016): 77, doi:10.3389/feart.2016.00077.
Suggested CitationArticle: Vonk, Jorien E., Dickens, Angela F., Giosan, Liviu, Hussain, Zainab A., Kim, Bokyung, Zipper, Samuel C., Holmes, Robert M., Montlucon, Daniel B., Galy, Valier, Eglinton, Timothy I., "Arctic deltaic lake sediments as recorders of fluvial organic matter deposition", Frontiers in Earth Science 4 (2016): 77, DOI:10.3389/feart.2016.00077, https://hdl.handle.net/1912/8769
The following license files are associated with this item:
Showing items related by title, author, creator and subject.
The sediments of the western Gulf of Mexico. I. The continental terrace of the western Gulf of Mexico : its surface sediments, origin, and development. II. Chemical studies of sediments of the western Gulf of Mexico Stetson, Henry C.; Trask, Parker D. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1953-05)In 1947 the Woods Hole Oceanographic Institution organized an expedition to investigate the bottom sediments and oceanography of the northwest Gulf of Mexico. The Geological Society of America contributed to the support ...
Modern sedimentation in the Northern Barents Sea : input, dipersal and deposition of suspended sediments from glacial meltwater Pfirman, Stephanie L. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1984-08)The modern depositional environment of the northern epicontinental Barents Sea varies from proximal to distal glaciomarine. The regional surface sediment distribution is controlled by erosion of shallow banks of the ...
Povinec, Pavel P.; Pham, Mai Khanh; Sanchez-Cabeza, J. A.; Barci-Funel, G.; Bojanowski, R.; Boshkova, T.; Burnett, William C.; Carvalho, Fernando; Chapeyron, B.; Cunha, I. L.; Dahlgaard, H.; Galabov, N.; Fifield, L. K.; Gastaud, J.; Geering, J. -J.; Gomez, I. F.; Green, N.; Hamilton, T.; Ibanez, F. L.; Ibn Majah, M.; John, M.; Kanisch, G.; Kenna, Timothy C.; Kloster, M.; Korun, M.; Liong Wee Kwong, L.; La Rosa, J.; Lee, S.-H.; Levy-Palomo, I.; Malatova, M.; Maruo, Y.; Mitchell, P.; Murciano, I. V.; Nelson, Robert K.; Nouredine, A.; Oh, J.-S.; Oregioni, B.; Le Petit, G.; Pettersson, H. B. L.; Reineking, A.; Smedley, P. A.; Suckow, A.; van der Struijs, T. D. B.; Voors, P. I.; Yoshimizu, K.; Wyse, E. (2006-07-11)A reference material designed for the determination of anthropogenic and natural radionuclides in sediment, IAEA-384 (Fangataufa Lagoon sediment), is described and the results of certification are presented. The material ...