144
W. J. Jenkins et al.: A comprehensive global oceanic dataset of helium isotope and tritium measurements
Table 1. Fields (columns) in the main data table,
Field name Field type Field description
ExpoCode Short text Unique string identifying cruise/expedition
Sect_ID Short text String identifying Ocean Section (WOCE, CLIVAR, or GEOTRACES)
Station Short text Station name or number
CastNo Short text Cast name or number at that station
Bottle Short text Bottle name or number on that cast
StaDate Number Decimal year of sampling
Latitude Number North latitude in decimal degrees (from —90 to +90)
Longitude Number East longitude in decimal degrees (from — 180 to +180)
StaDepth Number Bottom depth at station location in meters
Pressure Number Bottle depth (actually pressure) measured in dbar
Temperature Number {n situ temperature in degrees centigrade
Temperature_Flag Integer Temperature quality flag (see QF table)
Salinity Number Sample salinity in PSU
Salinity_Flag Integer Salinity quality flag (see QF table)
Oxygen Number Dissolved oxygen in umol kg7!
Oxygen_Flag Integer Dissolved oxygen flag (see QF table)
Tritium Number Tritium in TU at time of sampling
Tritium_Error Number Uncertainty in TU at time of sampling
Tritium_Flag "nteger Tritium quality flag (see QF table)
Tritiuum_PI Short text Principle investigator or measurer of tritium
Tritium_PI_Inst Short text Institution or laboratory where tritium was measured
Tritiuum_Method Short text Short descriptor of tritium sampling/analysis method
DelHe3 Number Helium isotope ratio anomaly relative to atmosphere in percent
DelHe3_Error Number Uncertainty in helium isotope ratio anomaly
DelHe3_Flag Integer Helium isotope ratio anomaly quality flag (see QF table)
Helium Number Dissolved helium concentration in nmol kg7!
Helium_ Error Number Uncertainty in dissolved helium concentration in nmolkg”
Helium_Flag Integer Dissolved helium quality flag (see QF table)
Neon Number Dissolved neon concentration in nmol kg7!
Neon_Error Number Uncertainty in dissolved neon concentration in nmolkg”'
Neon_Flag Integer Dissolved neon quality flag (see QF table)
Helium_PI Short text Principle investigator or measurer of helium (and neon)
Heliulm_PI_Ins Short text {nstitution or laboratory where tritium was measured
Helium_Method Short text Short descriptor of helium sampling/analysis method
Reference_Code Short text Data origin or link to paper discussing data
Reference_Source Short text Data source within reference (e.g., table, figure) if relevant
DOI Short text Digital Object Identifer of original dataset (if existing)
Comment Short text \dditional information or comments
Record ID Long inteser niaue record identifier number
The dataset (provided in several digital formats described
below) consists of three tables. The REFERENCES table is
a list of the data sources keyed by the text variable “Refer-
ence_Code” found in the main data table. This provides at-
irbution or more information regarding the data origin. The
METHODS table provides a more complete description of
the fields “Tritiuum_Method” and “Helium Method” in the
main data table. This is intended to provide useful interpre-
tive information regarding how the sampling and/or measure-
ments were accomplished. The main data table fields are de-
scribed in Table 1. Most data fields have an associated quality
flag field whose meaning is summarized in Table 2. Follow-
ing WOCE ocean data convention, normal acceptable data
zarth Syst. Sci. Data. 11. 441-454. 201.
are associated with a quality flag of 2, whereas questionable
data have a flag of 3. Results obtained by averaging two or
more replicates are signified with a flag of 6. When fields
are missing for a given record, the data are entered as -999
and the corresponding quality flag is 9. The tritium, helium,
helium isotope, and neon data also have an associated un-
certainty field (e.g., “Tritium_Error””), which is the estimated
uncertainty in the data points. This is either provided by the
data measurer or an estimate based on described procedures
and can vary greatly between methods and laboratories, so
the user is advised to be aware of this value.
www.earth-svst-sci-data.net/11/441/2019.
