NDP-098 (2018)

NCEI Accession 0176626 Data and Documentation Files

A comprehensive global oceanic dataset of discrete measurements of helium isotope and tritium during the hygrographic cruises on various ships from 1952-10-21 to 2016-01-22 (NCEI Accession 0176626)

William J. Jenkins1, Scott C. Doney1, 2, Michaela Fendrock1, Rana A. Fine3, Toshitaka Gamo4, Phillipe Jean-Baptiste5, Robert M. Key6, Birgitte Klein7 , John E. Lupton8, Monika Rhein9, Wolfgang Roether9, Yuji Sano4, Reiner Schlitzer10, Peter Schlosser11, James Swift12

Prepared by Alex Kozyr13

1Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA
2Now at University of Virginia, Charlottesville, VA 22904, USA
3RSMAS, University of Miami, Miami. FL 33149, USA
4Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Chiba 277-8564, Japan
5LSCE, CEA-CNRS-UVSQ, CEA/Saclay, 91191 Gif-sur-Yvette cedex, France
6Princeton University, Princeton, New Jersey, USA
7BSH, 20359 Hamburg, Germany
8NOAA Pacific Marine Environmental Laboratory, Newport, Oregon, USA
9IUP, University Bremen, D28359 Bremen, Germany
10Alfred Wegener Institute, 27568 Bremerhave, Germany
11LDEO, Columbia University, Palisades, NY, USA
12SIO, University of California San Diego, La Jolla, CA, USA
13NOAA, National Centers for Environmental Information, Ocean Carbon Data System (OCADS) , Silver Spring, MD 20910-3282, USA

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Abstract

The NDP-098 consists of global oceanic database of tritium and helium isotope measurements made by numerous researchers and laboratories over a period exceeding 60 years: from 1952-10-21 to 2016-01-22 in the Pacific Ocean, Atlantic Ocean, Indian Ocean, Southern Ocean, Arctic Ocean, Mediterranean Sea, Baltic Sea, Black Sea. Tritium and helium isotope data provide key information on ocean circulation, ventilation, and mixing, as well as the rates of biogeochemical processes, and deep-ocean hydrothermal processes. The dataset includes approximately 60,000 valid tritium measurements, 63,000 valid helium isotope determinations, 57,000 dissolved helium concentrations, and 34,000 dissolved neon concentrations. Some quality control has been applied in that questionable data have been flagged and clearly compromised data excluded entirely. Appropriate metadata has been included: geographic location, date, and sample depth. When available, water temperature, salinity, and dissolved oxygen were included. Data quality flags and data originator information (including methodology) are also included. Data are available at https://www.nodc.noaa.gov/ocads/data/0176626.xml.

Further details are in Jenkins, et al. 2018 (submitted to ESSD)

The data files correspond to 5 different formats:

(1) ACCDB -- a Microsoft ACCESS database native format
(2) CSV -- Comma-separated text format
(3) MAT -- MATLAB native binary format
(4) PSQL -- PostgreSQL database format (as a backup file)
(5) XLSX -- Microsoft EXCEL spreadsheet native format
(6) ODV -- The Ocean Data View (ODV) format

Each contains the equivalent of 3 tables:

(1) the actual data set, in the case of CSV and XLSX split into two parts due to spreadsheet size limitation
(2) the reference table linking to literature sources
(3) the email table listing contact information

The fields (columns) for the main data table are listed below. "Number" means double precision

Field_Name Field_Type Field_Description
ExpoCode Short Text Unique string identifying cruise/expedition
Sect_ID Short Text String identifying Ocean Section (WOCE/CLIVAR/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 In 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/kg
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 Integer Tritium quality flag (see QF table)
Tritium_PI Short Text Principle investigator or measurer of tritium
Tritium_PI_Inst Short Text Institution or laboratory where tritium was measured
Tritium_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/kg
Helium_Error Number Uncertainty in dissolved helium concentration in nmol/kg
Helium_Flag Integer Dissolved Helium quality flag (see QF table)
Neon Number Dissolved neon concentration in nmol/kg
Neon_Error Number Uncertainty in dissolved neon concentration in nmol/kg
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 Institution 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 orginal data set (if existing)
Comment Short Text Additional information or comments
Record_ID Integer Unique record identifier number

Important measurements (Temperature, Salinity, Oxygen, Tritium, DelHe3, Helium, and Neon) have an associated quality flag, which must be consulted when interpreting data, as data may be missing or otherwise compromised. Missing data is generally represented as -999

Quality_Flag_Number Meaning
2 Normal data, no problems reported
3 Questionable data: may not fit profile or some other doubt
6 Average of 2 or more measurements
9 MeaMissing (null) dataning

Please cite this data set as:
Jenkins, William J.; Doney, Scott C.; Fendrock, Michaela; Fine, Rana; Gamo, Toshitaka; Jean-Baptiste, Phillipe; Key, Robert M.; Klein, Birgitte; Lupton, John E.; Rhein, Monika; Roether, Wolfgang; Sano, Yuji; Schlitzer, Reiner; Schlosser, Peter; Swift, James (2018). A comprehensive global oceanic dataset of discrete measurements of helium isotope and tritium during the hygrographic cruises on various ships from 1952-10-21 to 2016-01-22 (NCEI Accession 0176626). Version 1.1. NOAA National Centers for Environmental Information Dataset. doi: 10.25921/c1sn-9631

Last Modified: 2018-10-17 16:43 UTC