Dataset: Biogenic and lithogenic silica concentrations from marine suspended particles collected during the 2011 CLIVAR S04P expedition on RVIB Nathaniel B. Palmer from February 19 to April 19, 2011

This dataset has not been validatedRelease Date:2024-09-10Data not availableVersion 1 (2024-07-08)Dataset Type:Cruise Results

Principal Investigator: Peter L. Morton (Florida State University)

Scientist: Jeffrey W. Krause (Dauphin Island Sea Lab)

BCO-DMO Data Manager: Shannon Rauch (Woods Hole Oceanographic Institution)


Program: U. S. Climate Variability and Predictability (U.S. CLIVAR)

Project: Collaborative Research: Iron Incorporation into Biogenic Silica (SO-Fe-bSi)


Abstract

This dataset reports biogenic and lithogenic silica concentrations (in micromoles per liter (µmol/L)) from marine suspended particles collected during the 2011 CLIVAR S04P expedition on RVIB Nathaniel B. Palmer, 19 Feb-19 April 2011, which followed the 67° South parallel in the Pacific sector of the Southern Ocean, from the Ross Sea to the Western Antarctic Peninsula. Water from the upper 1000 meters was collected using a contamination-free trace metal rosette (12-liter Teflon-coated GO-Flo bott...

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Water (2-10.9 liters) from each GO-Flo was filtered over a 47-millimeter (mm) diameter, 0.4-micrometer (µm) pore size PCTE filter (Measures et al., 2008). Samples were stored in new Whatman petri slides, double-bagged, at room temperature until ready for processing. The filters were subdivided into thirds or quarters using a ceramic rotary blade on a clean acrylic panel.

One subsection (1/3 or 1/4) was processed for biogenic and lithogenic silica concentrations, according to Krause et al. (2009) and Brzezinski and Nelson (1995). In brief, the filter subsample was submerged in 0.2 N NaOH for 2 hours in Teflon tubes to dissolve the silica. The resulting solution was reacted with ammonium molybdate, metol, and oxalic acid to produce silicomolybous acid, the absorbance of which was measured spectrophotometrically.

Lithogenic silica concentrations were determined using a subsample of the original NaOH digest solution, which was diluted with DI water and centrifuged. The supernatant was taken to dryness then digested again using HF over 48 hours. Boric acid was added to the HF solution, which was then reacted and analyzed in the same way as the biogenic silica digest solutions.

Concentrations were determined using matrix-matched standards for both the biogenic and lithogenic digest solutions.


Related Datasets

IsRelatedTo

Dataset: https://cchdo.ucsd.edu/cruise/320620110219
CCHDO Hydrographic Data Office (2023). CCHDO Hydrographic Data Archive, Hydrographic Cruise: 320620110219. In CCHDO Hydrographic Data Archive. UC San Diego Library Digital Collections. https://cchdo.ucsd.edu/cruise/320620110219

Related Publications

Methods

Brzezinski, M. A., & Nelson, D. M. (1995). The annual silica cycle in the Sargasso Sea near Bermuda. Deep Sea Research Part I: Oceanographic Research Papers, 42(7), 1215–1237. doi:10.1016/0967-0637(95)93592-3
Methods

Krause, J. W., Nelson, D. M., & Lomas, M. W. (2009). Biogeochemical responses to late-winter storms in the Sargasso Sea, II: Increased rates of biogenic silica production and export. Deep Sea Research Part I: Oceanographic Research Papers, 56(6), 861–874. doi:10.1016/j.dsr.2009.01.002
Methods

Measures, C. I., Landing, W. M., Brown, M. T., & Buck, C. S. (2008). High‐resolution Al and Fe data from the Atlantic Ocean CLIVAR‐CO2 Repeat Hydrography A16N transect: Extensive linkages between atmospheric dust and upper ocean geochemistry. Global Biogeochemical Cycles, 22(1). Portico. https://doi.org/10.1029/2007gb003042