Dataset: delta_O_18
Deployment: AL9707

Oxygen Isotope data, GLOBEC and Canadian Cruises, 1994-1998.

Principal Investigator:

Robert W. Houghton (Lamont-Doherty Earth Observatory, LDEO)

BCO-DMO Data Manager:

Ms Dicky Allison (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

U.S. GLOBEC Georges Bank (GB)

Data URL:

https://www.bco-dmo.org/dataset-deployment/449888/data

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Description

Oxygen Isotope data, GLOBEC and Canadian Cruises 1994-1998

Oxygen isotope data are derived from water samples collected on GLOBEC broad-scale and contemporaneous Canadian cruises 1994-1998. The isotope ratio H₂¹⁸O/H₂¹⁶O is measured, using a VG Prism II mass-spectrometer operated by Rick Mortlock and maintained by Rick Fairbanks at LDEO, and presented in delta¹⁸O notation where:
- Replicates of each water sample are analyzed. The data presented is the average of the replicates and their difference. If the difference exceeds 0.066 the analysis is repeated. The average standard deviation of the data is 0.033.
- The content of the data file varies according to source, degree of editing, and some arbitrary formating changes. For broad-scale data the cruise is always given in the file name and sometimes the header. The station number is the broad-scale standard station with associated lat., long., and bottom depth. Temperature, salinity, bottle depth, and sometimes fluorescence and transmissivity data are copied from the broad-scale hydrographic data file.
- Canadian data are from C.S.S. Parizeau cruises. The station and bottle number are unique to a particular cruise. When depth is listed as pressure it is numerically equivalent to depth in meters. Hydrographic data are supplied by Gary Bugden at the Bedford Institute of Oceanography.
- The time for each file is denoted by month and year. More precise day and hour information is available in the original hydrographic file.

Contributors:
Bob Houghton and Rick Fairbanks

Any questions, contact:
Bob Houghton
Lamont-Doherty Earth Observatory of Columbia University
Palisades, NY 10964
voice: 845 365 8328
fax: 845 365 8157
email: houghton@ldeo.columbia.edu

Updated: November 15, 2004; gfh

Methods & Sampling

Dataset acquisition description

Oxygen isotope data are derived from water samples collected on GLOBEC broad-scale and contemporaneous Canadian cruises 1994-1998. The isotope ratio H218O/H216O is measured, using a VG Prism II mass-spectrometer operated by Rick Mortlock and maintained by Rick Fairbanks at LDEO.

Deployment-specific acquisition description

Data Processing Description

Dataset Processing Description

Replicates of each water sample are analyzed. The data presented is the average of the replicates and their difference. If the difference exceeds 0.066 the analysis is repeated. The average standard deviation of the data is 0.033.

The content of the data file varies according to source, degree of editing, and some arbitrary formating changes. For broad-scale data the cruise is always given in the file name and sometimes the header. The station number is the broad-scale standard station with associated lat., long., and bottom depth. Temperature, salinity, bottle depth, and sometimes fluorescence and transmissivity data are copied from the broad-scale hydrographic data file.

Canadian data are from C.S.S. Parizeau cruises. The station and bottle number are unique to a particular cruise. When depth is listed as pressure it is numerically equivalent to depth in meters. Hydrographic data are supplied by Gary Bugden at the Bedford Institute of Oceanography.

The time for each file is denoted by month and year. More precise day and hour information is available in the original hydrographic file.

Deployment-specific processing description

<ul>
<li> Replicates of each water sample are analyzed. The data presented is the average of the replicates and their difference. If the difference exceeds 0.066 the analysis is repeated. The average standard deviation of the data is 0.033.

<li> The content of the data file varies according to source, degree of editing, and some arbitrary formating changes. For broad-scale data the cruise is always given in the file name and sometimes the header. The station number is the broad-scale standard station with associated lat., long., and bottom depth. Temperature, salinity, bottle depth, and sometimes fluorescence and transmissivity data are copied from the broad-scale hydrographic data file.

<li> Canadian data are from C.S.S. Parizeau cruises. The station and bottle number are unique to a particular cruise. When depth is listed as pressure it is numerically equivalent to depth in meters. Hydrographic data are supplied by Gary Bugden at the Bedford Institute of Oceanography.

<li> The time for each file is denoted by month and year. More precise day and hour information is available in the original hydrographic file.
</ul>

More information about this dataset deployment

Funding

Award Number	Funding Source
unknown GB NOAA	National Oceanic and Atmospheric Administration
unknown GB NSF	National Science Foundation

Instruments

CTD Neil Brown Mark 5

Supplied Name: Mark 5 CTD

Supplied Description:

Mark 5 CTD.

Instrument Type

Generic Name: CTD Neil Brown Mark 5

Acronym: CTD NBIS MK5

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

Generic Description:

The Neil Brown Instrument Systems Mark 5 CTD is used to measure conductivity, temperature, and depth of sea water. The MK5 profiler has a higher sampling rate then the SeaBird SEACAT. (For the GLOBEC Georges Bank project the Mark 5 was instrumented with an expanded suite of sensors and deployed almost exclusively at GLOBEC Standard stations.)

CTD Sea-Bird 911

Supplied Name: CTD Seabird 911

Supplied Description:

CTD measurements taken by a SBE911 (SeaBird) CTD instrument package

Instrument Type

Generic Name: CTD Sea-Bird 911

Acronym: CTD SBE 911

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0035/

Generic Description:

The Sea-Bird SBE 911 is a type of CTD instrument package. The SBE 911 includes the SBE 9 Underwater Unit and the SBE 11 Deck Unit (for real-time readout using conductive wire) for deployment from a vessel. The combination of the SBE 9 and SBE 11 is called a SBE 911. The SBE 9 uses Sea-Bird's standard modular temperature and conductivity sensors (SBE 3 and SBE 4). The SBE 9 CTD can be configured with auxiliary sensors to measure other parameters including dissolved oxygen, pH, turbidity, fluorescence, light (PAR), light transmission, etc.). More information from Sea-Bird Electronics.

Isotope-ratio Mass Spectrometer

Supplied Name: VG Prism II Mass-Spectrometer

Supplied Description:

The isotope ratio H₂¹⁸O/H₂¹⁶O is measured, using a VG Prism II mass-spectrometer operated by Rick Mortlock and maintained by Rick Fairbanks at LDEO.

Instrument Type

Generic Name: Isotope-ratio Mass Spectrometer

Acronym: IR Mass Spec; IRMS

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/LAB16/

Generic Description:

The Isotope-ratio Mass Spectrometer is a particular type of mass spectrometer used to measure the relative abundance of isotopes in a given sample (e.g. VG Prism II Isotope Ratio Mass-Spectrometer).

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
month_begin	starting month of cruise		month_start
day_begin	starting day of cruise		day_start
month_end	ending month of cruise		month_end
day_end	ending day of cruise		day_end
si	name of contributing scientist(s)		investigator
location	sampling program/area		no_bcodmo_term
event	event number, combination of cruiseid and cast number		event
station_std	standard station number		station_std
cast	CTD/bottle cast number		cast
bottle	bottle number/identification		bottle
lat	latitude, negative = South	decimal degrees	lat
lon	longitude, negative = West	decimal degrees	lon
delta_O_18	isotope ratio H₂¹⁸O/H₂¹⁶O, presented in delta¹⁸O notation		d18O
temp	temperature	degrees centigrade	temp
sal	salinity, PSS		sal
trans_v	light transmission	volts	trans_v
cond_mM	conductivity	milliMhos/centimeter	cond_mM
depth_w	water depth	meters	depth_w
depth	depth of sample	meters	depth
diff_delta_O_18	difference range between replicates		no_bcodmo_term
comments	identifies repeated analysis		comment
cruiseid	cruise identification		cruiseid
year	Year of cruise, 4 digit year		year
flvolt	fluorescence, from CTD mounted fluorometer	volts	flvolt

Database

Contribute Data

Dataset: delta_O_18
Deployment: AL9707

Dataset acquisition description

Deployment-specific acquisition description

Dataset Processing Description

Deployment-specific processing description

Database

Contribute Data

Dataset: delta_O_18Deployment: AL9707

Dataset acquisition description

Deployment-specific acquisition description

Dataset Processing Description

Deployment-specific processing description

Dataset: delta_O_18
Deployment: AL9707