Porewater sulfate, sulfide, ammonia, phosphate, and silicate concentrations in Alvin pushcore samples from Guaymas Basin hydrothermal sediments collected on R/V Atlantis cruise AT37-06 in December 2016 (NCEI Accession 0278298)

This dataset contains chemical data collected on Alvin and R/V Atlantis during cruise AT37-06 and deployment AT37-06_Alvin_Dives in the Gulf of California from 2016-12-09 to 2016-12-27. These data include Nitrate, Nitrite, SiOH_4, depth, and nitrate plus nitrite. The instruments used to collect these data include Continuous Flow Analyzer, Ion Chromatograph, Push Corer, and Sediment Porewater Sampler. These data were collected by Samantha B. Joye of University of Georgia and Andreas Teske of University of North Carolina at Chapel Hill as part of the "Collaborative Research: Microbial Carbon cycling and its interactions with Sulfur and Nitrogen transformations in Guaymas Basin hydrothermal sediments (Guaymas Basin Interactions)" project. The Biological and Chemical Oceanography Data Management Office (BCO-DMO) submitted these data to NCEI on 2021-03-12.

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

Guaymas porewater nutrients

Dataset Description:
Acquisition Description:
Methodology: Porewater sulfide concentrations were determined photometrically, and sulfate concentrations were determined by ion chromatography.

Sampling and Analytical Procedures: This porewater sulfate and sulfide dataset consists of results obtained at the Max-Planck-Institute for Marine Microbiology in Bremen, Germany. The experimental procedures are listed here separately by institution. The sampling site names in the data table are based on Teske et al. 2016 and Teske et al. 2021.

For analyses at the Max-Planck Institute for Marine Microbiology (Gunter Wegener), intact sediment cores were sampled using the Rhizons (Rhizosphere Research Products, Wageningen, NL) as described previously (Seeberg-Elversfeldt et al., 2005). The overlying water was removed from the cores and holes were drilled into designated sediment sampling depths. Pretreated Rhizons were injected and suction was applied with syringes for approx. 30 min. The rhizome depths are given in the sample tables. For sulfide analysis, 1 ml porewater subsamples were fixed with 0.1 ml of 0.1 M zinc acetate solution to preserve the sulfide as zinc sulfide until analysis by the methylene blue method (Cline 1969). The same fixed porewater sample was used for measuring sulfate concentrations using ion chromatography (Metrohm 930 Compact IC flex oven, Metrosep A PCC HC/4.0 preconcentration column, and Metrosep A Supp 5 Guard/4.0 chromatography column). The concentrations of ammonia, phosphate, and silicate were determined from porewater using a continuous flow nutrient analyzer (QuAAtro39; Seal Analytical) as published previously (Grasshoff et al., 2009).

Known Problems/Issues : Problems with Mexican customs and the agent used by WHOI at the time have resulted in limited availability of sampling gear and sampling vials on the ship. Transport problems during the return trip have caused sample losses among the porewater samples, which are evident in occasional gaps in porewater profiles or short profiles.

Note that the Alvin frame grabber was not turned on during dive 4862; therefore positions and depth are approximations.