Dataset: TN327 Axial 2015 CTD Bottle Data
Deployment: TN327

Principal Investigator:

David A. Butterfield (National Oceanic and Atmospheric Administration, NOAA-PMEL)

Co-Principal Investigator:

Joseph A. Resing (National Oceanic and Atmospheric Administration, NOAA-PMEL)

BCO-DMO Data Manager:

Megan Switzer (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

Event response to an eruption at Axial Seamount (NeMO2015)

Version:

Deployment Synonyms:

NeMO 2015

Data URL:

https://www.bco-dmo.org/dataset-deployment/728717/data

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Description

Axial Seamount 2015 Niskin Sample Data for TN327. In addition to standard CTD instrument measurements, water samples were analyzed on board for methane and hydrogen concentration by D. Butterfield and B. Larson using an SRI 8610C gas chromatograph with flame ionization detector for CH4 and pulsed discharge detector for H2 as described in (Larson et al., 2015). Due to time constraints, only selected samples were analyzed.

Methane and hydrogen results are reported in nmol/L. Methane and hydrogen results have been published in (Spietz et al., 2018).

The full CTD data for the cruise is available from the R2R site: http://www.rvdata.us/catalog/TN327

Metadata is also available through the cruise report on the PMEL web site:
https://www.pmel.noaa.gov/eoi/axial/2015/Axial2015-Cruise-Report-with-logs-revised.pdf

Methods & Sampling

Dataset acquisition description

Data Processing Description

Dataset Processing Description

BCO-DMO processing notes:
-Changed parameter names to BCO-DMO naming conventions

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-1546695	NSF Division of Ocean Sciences

Instruments

CTD - profiler

Supplied Name:

Supplied Description:

Instrument Type

Generic Name: CTD - profiler

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/130/

Generic Description:

The Conductivity, Temperature, Depth (CTD) unit is an integrated instrument package designed to measure the conductivity, temperature, and pressure (depth) of the water column. The instrument is lowered via cable through the water column. It permits scientists to observe the physical properties in real-time via a conducting cable, which is typically connected to a CTD to a deck unit and computer on a ship. The CTD is often configured with additional optional sensors including fluorometers, transmissometers and/or radiometers. It is often combined with a Rosette of water sampling bottles (e.g. Niskin, GO-FLO) for collecting discrete water samples during the cast.

This term applies to profiling CTDs. For fixed CTDs, see https://www.bco-dmo.org/instrument/869934.

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
Cruise_ID	Cruise number (for T.G. Thompson)	no units	cruise_id
Cast_type	Cast type (Vertical or Tow)	no units	cast_type
Cast_name	Unique Cast ID# composed of V or T, 15A cruise identifier, NN number of vertical cast or tow for this cruise.	no units	cast
Site_name	Descriptor of the cast site.	no units	site
Cast_number	Overall sequence number of CTD casts on this cruise.	number	cast
Bottle_position	Niskin bottle position on CTD rosette.	no units	bottle
Niskin_number	Number on Niskin bottle (generally the same as bottle position).	no units	bottle
Date	UTC date when Niskin bottle was fired.	no units	date
Time	UTC time when Niskin bottle was fired.	no units	time
Press	Pressure in decibars.	decibars	press
Depth	Depth in meters.	meters	depth
Temp	Temperature in degrees C.	degrees Celsius	temp
Cond	Conductivity in Siemens per meter.	Siemens per meter	cond
Sal	Salinity in practical salinity units.	practical salinity units (psu)	sal
Theta	Potential temperature at sea surface in degrees C.	degrees Celsius	potemp
Sigma_theta	Potential density at sea surface in kg/m3.	kg/m3	sigma_theta
O2_VO_volts	Oxygen sensor 1 output in volts.	volts	O2
O2_V1_volts	Oxygen sensor 2 output in volts.	volts	O2
ORP_V2	Oxygen redox potential sensor place holder (no data).	no units	no_bcodmo_term
Fluoro_V3	Fluorometer sensor place holder (no data).	no units	fluor
LSS_V4	Light scattering sensor output in volts.	volts	light_bs
LSS_V5	Light scattering sensor output in volts.	volts	light_bs
empty_V6	Meaningless data.	no units	no_bcodmo_term
Alt_V7	Altimeter output in volts.	volts	altimeter
Alt_meters	Altitude reading in meters above seafloor.	meters	altimeter
O2_V1_umol	Oxygen sensor 1 output in micromol/liter.	micromol/L	O2
O2_V2_umol	Oxygen sensor 2 output in micromol/liter.	micromol/L	O2
scan_number	Scan line number for individual CTD cast.	number	scan
time_ctd	Time in CTD format (since 01/01/1970).	no units	time
ORP_03	Oxygen redox potential sensor output in millivolts.	millivolts	no_bcodmo_term
ORP_02	Oxygen redox potential sensor place holder (no data).	no units	no_bcodmo_term
dNTU_V4	LSS voltage V4 converted to dimensionless nephelometric turbidity units.	NTU	turbidity
dNTU_V5	LSS voltage V5 converted to dimensionless nephelometric turbidity units.	NTU	turbidity
Lon	Longitude in decimal degrees.	decimal degrees	lon
Lat	Latitude in decimal degrees.	decimal degrees	lat
CH4	Methane concentration in nanomol/liter from shipboard gas chromatography (published in Spietz et al. 2018 Oceanography).	nanomol/Liter	CH4
H2	Hydrogen concentration in nanomol/liter from shipboard gas chromatography (published in Spietz et al. 2018 Oceanography).	nanomol/Liter	hydrogen

Database

Contribute Data

Dataset: TN327 Axial 2015 CTD Bottle Data
Deployment: TN327

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: TN327 Axial 2015 CTD Bottle DataDeployment: TN327

Dataset acquisition description

Dataset Processing Description

Dataset: TN327 Axial 2015 CTD Bottle Data
Deployment: TN327