Abstract:
Volatile fatty acids and alcohols concentrations, stable carbon isotopic compositions and metabolic rates in hydrothermally altered sediments data collected aboard R/V Atlantis cruise AT37-06 in the Guaymas Basin, the Gulf of California from 2016-12-18 to 2016-12-24 at six sampling stations. The purpose of this cruise was to understand the generation and utilization of volatile fatty acids and alcohols in hydrothermally altered sediments of the Guaymas Basin. The data includes information about the sampling stations (coordinates, date and dive number), geochemistry data (dissolved inorganic carbon, dissolved organic carbon, methanol, ethanol, and the concentration and isotopic compositions of formate, acetate, and lactate), methanogenesis and oxidation rate for acetate and methanol, and the inhibition experiment results. The R/V Atlantis cruise AT37-06 purpose was to sample the microbial carbon cycling and its interactions with sulfur and nitrogen transformations in the Guaymas Basin hydrothermal sediments. The research cruise left Manzanillo, Mexico on 2016-12-09 and returned 2016-12-27 and it was lead by Chief scientist Andreas Teske. Additional cruise information can be found at http://www.rvdata.us/catalog/AT37-06.
Suggested Citation:
Guangchao Zhuang. 2018. Volatile fatty acids and alcohols concentrations, stable carbon isotopic compositions, and metabolic rates in hydrothermally altered sediments data collected aboard R/V Atlantis cruise AT37-06 in the Guaymas Basin, the Gulf of California from 2016-12-18 to 2016-12-24. Distributed by: GRIIDC, Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/n7-334g-eh74
Data Parameters and Units:
Sampling date (DD/MM/YYYY), latitude (degrees minutes N), longitude (degrees minutes W), dive number. Geochemistry: DIC (dissolved inorganic carbon; mmol/L), DOC (dissolved organic carbon; micromol/L), formate (μmol/L), delta13C-formate (per mil), acetate (micromol/L), delta13C-acetate (per), lactate (micromol/L), delta13C-lactate (per mil), methanol (micromol/L), ethanol (micromol/L), temperature (degrees C). Methanogenesis and oxidation rate: depth (cm), incubation temperature (degrees C), acetate methanogenesis rate (picomol cm^-3 d^-1), acetate turnover time to methane (d), acetate oxidation rate (picomol cm^-3 d^-1), acetate turnover time to CO2 (d), methanol methanogenesis rate (picomol cm^-3 d^-1), methanol turnover time to methane (d), methanol oxidation rate (picomol cm^-3 d^-1), methanol turnover time to CO2 (d), standard deviations for all measurements (STDEV). Inhibition experiment: treatment, acetate methanogenesis rate (picomol cm^-3 d^-1), acetate oxidation rate (picomol cm^-3 d^-1), methanol methanogenesis rate (picomol cm^-3 d^-1), methanol oxidation rate (picomol cm^-3 d^-1). BES: 2-bromoethanesulfonate. B.D.=below detection limit. N.D.=not determined.
Correction note for cell A23: Samples were collected from hydrothermal sediments of Guaymas Basin, Gulf of California during cruise AT37-06, December, 2016.
Methods:
For methanogenesis from acetate and methanol, the turnover times in days (d) were calculated based on the time required to metabolize the total amount of added 14C-labeled acetate and methanol to methane. The turnover rate to methane (d–1) was expressed as the reciprocal of the turnover time. Methanogenesis rates were calculated by multiplying the in situ substrate concentration by the turnover rate and isotopic fractionation factor. For acetate and methanol oxidation, the turnover times to CO2 (d) were calculated based on the time required to oxidize the total amount of added 14C-labeled tracers. The rate of substrate turnover to CO2 was expressed as the reciprocal of the turnover time (d–1). Oxidation rates were calculated by multiplying the in situ substrate concentrations by the turnover rate.
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