File(s) | Type | Description | Action |
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sediment_cores.csv (3.85 KB) | Comma Separated Values (.csv) | Primary data file for dataset ID 886227 | Add to Cart Download |
These data were collected during 2018-2019 from a sandy subterranean estuary (STE) located in Gloucester Point, Virginia, USA. Seasonal vibracores collected sediment from 0-100 centimeters (cm). Ten-centimeter core sections were used in isotope tracer incubations with 15N-labeled substrates to measure potential denitrification and anaerobic ammonium oxidation (anammox) rates. Extractable nutrient concentrations in potassium chloride extracts were also analyzed for each core section.
These data were collected during 2018-2019 from a sandy subterranean estuary (STE) located in Gloucester Point, Virginia, USA (37.248884, -76.505324). In four seasons, a vibracore collected a sediment core roughly 100 centimeters (cm) in length from the mid-tide line of the beach during low tide. Cores were sectioned into ten-centimeter increments. Extractable nutrient concentrations in potassium chloride extracts were analyzed for NOx (nitrate + nitrite), nitrite, and ammonium with a Lachat autoanalyzer. Core sections were used in isotope tracer incubations with 15N-labeled substrates to measure potential denitrification and anaerobic ammonium oxidation (anammox) rates. Briefly, 1 gram (g) of the composited sediment from each 10 cm section was used in sediment slurry incubation experiments. Samples were incubated for 6, 12, or 24 hours in sealed, helium-flushed 12 milliliter (mL) exetainer vials (Labco) at the measured in situ temperature. Denitrification rate incubations were amended with 100 nanomoles ¹⁵NO₃⁻ (99 atm%, Cambridge Isotope Laboratories, Inc.), and ²⁹,³⁰N₂ products were measured using a gas bench isotope ratio mass spectrometer (IRMS, Delta V Plus, Thermo Fisher Scientific, Waltham, MA). To measure potential anammox rates, 500 nanomoles of ¹⁵NH₄⁺ (99 atm%, Cambridge Isotope Laboratories, Inc.) and 100 nmoles ¹⁴NO₂⁻ were added to the sediment slurries; the production of ²⁹N₂ was measured by IRMS. N₂ production rates were calculated using the methods described by (Song and Tobias, 2011). All incubations were conducted in duplicate.
Wilson, S. J., Song, B., Anderson, I. C., Tobias, C. (2023) Biogeochemical data from sediment cores collected from a shallow, sandy subterranean estuary (STE) in Virginia USA from 2018 to 2019. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2023-01-03 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.886227.1 [access date]
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