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
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
