Dataset: TN327 Axial 2015 CTD Bottle Data

Name: CTD bottle data collected near the Axial Seamount on the Juan de Fuca Ridge on R/V Thomas G. Thompson TN327 in August 2015.
Published: 2018-03-01
Keywords: oceans

Cite This Dataset

Spatial Extent: N:46.9272 E:-129.7955 S:45.9173 W:-130.0217

Temporal Extent: 2015-08-15 - 2018-08-26

Project:

Event response to an eruption at Axial Seamount (NeMO2015)

Program:

Ocean Observatories Initiative (OOI)

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)

Version:

Version Date:

2018-03-01

Restricted:

CTD bottle data collected near the Axial Seamount on the Juan de Fuca Ridge on R/V Thomas G. Thompson TN327 in August 2015.

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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

Data Processing Description

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

Data Files

File
728426.csv (Comma Separated Values (.csv), 37.91 KB) MD5:a8dad4430750586442bdb416b4144ac4 Primary data file for dataset ID 728426

More Information about this dataset

Funding Sources

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

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
TN327	NeMO 2015	2015-08-14	R/V Thomas G. Thompson	William Chadwick (Chief Scientist)	data info

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

Date and time formats are described in python strftime() syntax.

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

Database

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Dataset: TN327 Axial 2015 CTD Bottle Data