Biological and physical controls on the flux and characteristics of sinking particles on the Northwest Atlantic margin
Manganini, Steven J.
Montlucon, Daniel B.
Toole, John M.
Eglinton, Timothy I.
MetadataShow full item record
KeywordSinking particle flux; Biological carbon pump; Radiocarbon; Lateral particle supply; Sediment resuspension; Northwest Atlantic; Sediment trap
Biogenic matter characteristics and radiocarbon contents of organic carbon (OC) were examined on sinking particle samples intercepted at three nominal depths of 1000 m, 2000 m, and 3000 m (∼50 m above the seafloor) during a 3 year sediment trap program on the New England slope in the Northwest Atlantic. We have sought to characterize the sources of sinking particles in the context of vertical export of biogenic particles from the overlying water column and lateral supply of resuspended sediment particles from adjacent margin sediments. High aluminum (Al) abundances and low OC radiocarbon contents indicated contributions from resuspended sediment which was greatest at 3000 m but also significant at shallower depths. The benthic source (i.e., laterally supplied resuspended sediment) of opal appears negligible based on the absence of a correlation with Al fluxes. In comparison, CaCO3 fluxes at 3000 m showed a positive correlation with Al fluxes. Benthic sources accounted for 42 ∼ 63% of the sinking particle flux based on radiocarbon mass balance and the relationship between Al flux and CaCO3 flux. Episodic pulses of Al at 3000 m were significantly correlated with the near-bottom current at a nearby hydrographic mooring site, implying the importance of current variability in lateral particle transport. However, Al fluxes at 1000 m and 2000 m were coherent but differed from those at 3000 m, implying more than one mode of lateral supply of particles in the water column.
Author Posting. © American Geophysical Union, 2017. 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 122 (2017): 4539–4553, doi:10.1002/2016JC012549.
Suggested CitationJournal of Geophysical Research: Oceans 122 (2017): 4539–4553
Showing items related by title, author, creator and subject.
Rowe, Gilbert T.; Clifford, C. Hovey (Woods Hole Oceanographic Institution, 2018-05)This report presents data obtained from cored sediments collected during numerous cruises in the Northwest Atlantic area. The cores were obtained by SCUBA, gravity cores and DSRV ALVIN. The sediments were sampled with ...
Data file : sediments of the East Atlantic continental margin, northwest Africa : sample collection and analysis Briggs, Scott R.; Summerhayes, Colin P.; Milliman, John D. (Woods Hole Oceanographic Institution, 1976-06)The petrology, provenance, and history of sediments from the continental shelf and upper continental slope of western Africa have been studied in some detail by scientists from the Woods Hole Oceanographic Institution ...
Van Mooy, Benjamin A.S.; Rynearson, Tatiana (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: email@example.com, 2019-04-10)This dataset includes redox data from RV/Atlantic Explorer AE1812 in the northwest Atlantic, May 2018. For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_desc ...