O2 saturation from microsensor profiles of ex situ sediment cores collected in the Chesapeake Bay and measured during 2017-2018 (NCEI Accession 0291742)

This dataset contains chemical data collected from 2017-03-28 to 2018-08-24. These data include O2 saturation and depth core. The instruments used to collect these data include Gravity Corer and Unisense oxygen microsensor. These data were collected by Sairah Malkin of University of Maryland Center for Environmental Science as part of the "Collaborative Research: Probing the Metabolic and Electrical Interactions of Cable Bacteria in Anoxic Sediments (Anoxic Sediment Bacteria Interactions)" project. The Biological and Chemical Oceanography Data Management Office (BCO-DMO) submitted these data to NCEI on 2021-04-26.

The following is the text of the dataset description provided by BCO-DMO:

Microsensor profiles - O2Sat

Dataset Description:
Acquisition Description:
Methodology:
High-resolution microsensor profiling of O₂, pH, and H₂S was performed on replicate sediment cores retrieved from the sampling sites, with 1 or 2 replicate profiles made per sediment core per analyte, using commercial microsensors operated with a motorized micromanipulator (Unisense A.S., Denmark). Oxygen sensor data were calibrated with a 2-point calibration using air saturated water and anoxic zone of sediments. Detailed methodology is given in Malkin et al., 2014.

Sampling and Analytical Procedures:
Replicate sediment cores were collected using a gravity corer (Uwitec; clear PVC liners, Ø = 8.6 cm), capped, kept in the dark at bottom water temperature in a water bath, and transported back to the laboratory, where they were held in a climate-controlled room. Microsensor profiling was conducted within 1 day of core retrieval.

Instruments:
Unisense A.S. microsensors (Denmark) and motorized micromanipulator system were used for data collection. The 4 channel microsensor multimeter was used, with the following microsensors: Ox-50, pH-200, and H2S-100. Each sensor was used consecutively and so resultant data is provided separately as individual datasets. SensorTrace Suite software was used for data collection.