Dataset: Hydrothermal vent porewater nutrients - WHOI
Deployment: AT42-05

Guaymas pushcore nutrients (WHOI)

Principal Investigator:

Virginia P. Edgcomb (Woods Hole Oceanographic Institution, WHOI)

Co-Principal Investigator:

Andreas Teske (University of North Carolina at Chapel Hill, UNC-Chapel Hill)

BCO-DMO Data Manager:

Nancy Copley (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

Collaborative Research: Hydrothermal Fungi in the Guaymas Basin Hydrocarbon Ecosystem (HOTFUN)

Coordinated Deployments:

AT42-05_Alvin_Dives

Data URL:

https://www.bco-dmo.org/dataset-deployment/773370/data

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Description

Porewater nutrient concentrations from pushcore samples collected at two locations in the Guaymas Basin hydrothermal vents region during Alvin dives on RV/Atlantis cruise AT42-05, Nov. 2018. NO3+NO2, NH4, and PO4 concentrations at different depths within the cores are reported. These samples are reported by the PI at Woods Hole Oceanographic Institution.

Nutrient porewater samples from this cruise were also analyzed at the Max Planck Institute for Marine Microbiology. See related dataset: https://www.bco-dmo.org/dataset/816549 (MPI)

Methods & Sampling

Dataset acquisition description

Alvin pushcores dedicated to nutrient analyses were sectioned to recover the 0-6cm, 6-12, and 12-18cm fractions, or the 0-10, 10-20, and 20-30cm fractions. Two ~40ml samples of sediment were placed in 50 ml Falcon tubes and were centrifuged at 3000 rpm for 15 minutes to separate porewater from the sediment. After centrifugation, the porewater was filtered through sterile syringe cellulose 0.45 micron filters. 5 ml of the porewater was placed into 5 ml screwcap Eppendorf cryotubes stored without headspace at -20 degrees C for nitrate (NO3), nitrite (NO2) and phosphate (PO4) analysis. The headspace was flushed with nitrogen and the samples were stored inverted at 4 degrees C.

All porewater analyses were performed at Louisiana State University Wetland Biogeochemistry Analytical Services. Dilution info: All samples @ 2x and various samples @ 20x , 50x , 70x , and/or 350x.

Data Processing Description

Dataset Processing Description

BCO-DMO Processing Notes:
- added conventional header with dataset name, PI name, version date
- modified parameter names to conform with BCO-DMO naming conventions
- re-formatted date from d/m/yyyy to yyyy-mm-dd

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-1829903	NSF Division of Ocean Sciences

Instruments

Nutrient Autoanalyzer

Supplied Name:

Supplied Description:

Instrument Type

Generic Name: Nutrient Autoanalyzer

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/LAB04/

Generic Description:

Nutrient Autoanalyzer is a generic term used when specific type, make and model were not specified. In general, a Nutrient Autoanalyzer is an automated flow-thru system for doing nutrient analysis (nitrate, ammonium, orthophosphate, and silicate) on seawater samples.

Push Corer

Supplied Name:

Supplied Description:

Used to collect sediment samples

Instrument Type

Generic Name: Push Corer

Generic Description:

Capable of being performed in numerous environments, push coring is just as it sounds. Push coring is simply pushing the core barrel (often an aluminum or polycarbonate tube) into the sediment by hand. A push core is useful in that it causes very little disturbance to the more delicate upper layers of a sub-aqueous sediment.

Description obtained from: http://web.whoi.edu/coastal-group/about/how-we-work/field-methods/coring/

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
Date_local	sampling date - local time (UTC-07:00)	unitless	date_local
Site	sampling site name	unitless	site
Dive	Alvin dive number	unitless	dive_id
Sample_ID	sample identifier	unitless	sample
NO3_NO2_uM	nitrates and nitrites concentration from the push core pore water	micromoles/liter (uM)	NO3_NO2
NH4_uM	ammonium concentration from the push core pore water	micromoles/liter (uM)	NH4
PO4_uM	phosphates concentration from the push core pore water	micromoles/liter (uM)	PO4
lat	latitude; north is positive	decimal degrees	lat
lon	longitude; east is positive	decimal degrees	lon

Database

Contribute Data

Dataset: Hydrothermal vent porewater nutrients - WHOI
Deployment: AT42-05

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: Hydrothermal vent porewater nutrients - WHOIDeployment: AT42-05

Dataset acquisition description

Dataset Processing Description

Dataset: Hydrothermal vent porewater nutrients - WHOI
Deployment: AT42-05