Observational and modeling evidence of seasonal trends in sediment-derived material inputs to the Chukchi Sea
Spall, Michael A.
Pickart, Robert S.
Kadko, David C.
Moore, Willard S
Dabrowski, Jessica S.
Charette, Matthew A.
MetadataShow full item record
Benthic inputs of nutrients help support primary production in the Chukchi Sea and produce nutrient‐rich water masses that ventilate the halocline of the western Arctic Ocean. However, the complex biological and redox cycling of nutrients and trace metals make it difficult to directly monitor their benthic fluxes. In this study, we use radium‐228, which is a soluble radionuclide produced in sediments, and a numerical model of an inert, generic sediment‐derived tracer to study variability in sediment inputs to the Chukchi Sea. The 228Ra observations and modeling results are in general agreement and provide evidence of strong benthic inputs to the southern Chukchi Sea during the winter, while the northern shelf receives higher concentrations of sediment‐sourced materials in the spring and summer due to continued sediment‐water exchange as the water mass traverses the shelf. The highest tracer concentrations are observed near the shelfbreak and southeast of Hanna Shoal, a region known for high biological productivity and enhanced benthic biomass.
Author Posting. © American Geophysical Union, 2020. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 125(5), (2020): e2019JC016007, doi:10.1029/2019JC016007.
Suggested CitationKipp, L. E., Spall, M. A., Pickart, R. S., Kadko, D. C., Moore, W. S., Dabrowski, J. S., & Charette, M. A. (2020). Observational and modeling evidence of seasonal trends in sediment-derived material inputs to the Chukchi Sea. Journal of Geophysical Research: Oceans, 125(5), e2019JC016007.
Showing items related by title, author, creator and subject.
Lingering Chukchi Sea sea ice and Chukchi Sea mean winds influence population age structure of euphausiids (krill) found in the bowhead whale feeding hotspot near Pt. Barrow, Alaska Ashjian, Carin J.; Okkonen, Stephen R.; Campbell, Robert G.; Alatalo, Philip (Public Library of Science, 2021-07-12)Interannual variability in euphausiid (krill) abundance and population structure and associations of those measures with environmental drivers were investigated in an 11-year study conducted in late August–early September ...
Corlett, W. Bryce; Pickart, Robert S. (2017-03-15)Using a collection of 46 shipboard hydrographic/velocity transects occupied across the shelfbreak and slope of the Chukchi Sea between 2002 and 2014, we have quantified the existence of a current transporting Pacific-origin ...
Nitrogen limitation of the summer phytoplankton and heterotrophic prokaryote communities in the Chukchi Sea Mills, Matthew M.; Brown, Zachary W.; Laney, Samuel R.; Ortega-Retuerta, Eva; Lowry, Kate E.; van Dijken, Gert L.; Arrigo, Kevin R. (Frontiers Media, 2018-10-15)Major changes to Arctic marine ecosystems have resulted in longer growing seasons with increased phytoplankton production over larger areas. In the Chukchi Sea, the high productivity fuels intense benthic denitrification ...