Matlab Toolbox to Perform Secondary Quality Control (2nd QC) on Hydrographic Data (NCEI Accession 0164484)

High quality, reference measurements of chemical and physical properties of seawater are of great importance for a wide research community, including the need to validate models and attempts to quantify spatial and temporal variability. Whereas data precision has been improved by technological advances, the data accuracy has improved mainly by the use of certified reference materials (CRMs). However, since CRMs are not available for all variables, and use of CRMs does not guarantee bias-free data, we here present a recently developed Matlab toolbox for performing so-called secondary quality control (2nd QC) on oceanographic data by the use of crossover analysis. This method and how it has been implemented in this toolbox is described in detail. This toolbox is developed mainly for use by sea-going scientists as a tool for quickly assessing possible bias in the measurements that can—hopefully—be remedied during the expedition, but also for possible post-cruise adjustment of data to be consistent with previous measurements in the region.

Using this package allows crossover analysis to be performed. Crossover analysis is an objective comparison of deep water data from one cruise with data from other cruises in the same area (e.g., Sabine et al. 1999, Gouretski and Jancke 2001, Johnson et al. 2001, Sabine et al. 2005, Tanhua et al., 2010. The scripts in this package are modified versions of the scripts used by the CARINA project; see Tanhua et al. 2010 for more information. An extract of that information is given below.
  • Cite as: Lauvset, S.K.; Tanhua, T. (2018). Matlab Toolbox to Perform Secondary Quality Control (2nd QC) on Hydrographic Data (NCEI Accession 0164484). NOAA National Centers for Environmental Information. Unpublished Dataset. [access date]
gov.noaa.nodc:0164484
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Distribution Formats
  • Originator data format
Ordering Instructions Data in this archival information package are not currently available for public download from NCEI. Please contact NCEI Information Services directly for access to these data.
Distributor DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
301-713-3277
NCEI.Info@noaa.gov
Dataset Point of Contact Information Services
DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
301-713-3277
NCEI.Info@noaa.gov
Time Period 2015-01-01 to 2016-12-12
Spatial Bounding Box Coordinates
N: 90
S: -90
E: 180
W: -180
Spatial Coverage Map
General Documentation
  • Dataset Description
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Publication Dates
  • publication: 2018-08-11
Data Presentation Form Digital table - digital representation of facts or figures systematically displayed, especially in columns
Dataset Progress Status Complete - production of the data has been completed
Data Update Frequency As needed
Purpose Basic research
Use Limitations
  • Data in this archival information package are not currently available for public download from NCEI. Please contact NCEI Information Services directly for access to these data.
  • accessLevel: Public
  • Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives.
Dataset Citation
  • Cite as: Lauvset, S.K.; Tanhua, T. (2018). Matlab Toolbox to Perform Secondary Quality Control (2nd QC) on Hydrographic Data (NCEI Accession 0164484). NOAA National Centers for Environmental Information. Unpublished Dataset. [access date]
Cited Authors
  • Lauvset, S.K.
  • Tanhua, T.
Contributors
Resource Providers
Publishers
Theme keywords NODC DATA TYPES THESAURUS NODC OBSERVATION TYPES THESAURUS WMO_CategoryCode
  • oceanography
Data producer provided keywords
  • 2QC TOOLBOX
  • 2nd_QC_Tool_V2
  • Matlab Toolbox to Perform Secondary Quality Control (2nd QC) on Hydrographic Data
Global Change Master Directory (GCMD) Science and Services Keywords
  • EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY
  • EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > ALKALINITY
  • EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > CARBON DIOXIDE
  • EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > INORGANIC CARBON
  • EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NUTRIENTS
  • EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > OXYGEN
  • EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > PH
  • EARTH SCIENCE > OCEANS > OCEAN TEMPERATURE > WATER TEMPERATURE
  • EARTH SCIENCE > OCEANS > SALINITY/DENSITY > SALINITY
Data Center keywords Global Change Master Directory (GCMD) Data Center Keywords
  • DOC/NOAA/NESDIS/NODC > National Oceanographic Data Center, NESDIS, NOAA, U.S. Department of Commerce
  • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
NODC COLLECTING INSTITUTION NAMES THESAURUS NODC SUBMITTING INSTITUTION NAMES THESAURUS
Instrument keywords NODC INSTRUMENT TYPES THESAURUS Global Change Master Directory (GCMD) Instrument Keywords
  • PH METERS
Ocean Acidification Instrument Keywords
  • Potentiometric titrator for dissolved inorganic carbon (DIC) and total alkalinity (TA) measurement
Place keywords NODC SEA AREA NAMES THESAURUS Global Change Master Directory (GCMD) Location Keywords
  • OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN
  • OCEAN > ATLANTIC OCEAN > SOUTH ATLANTIC OCEAN
  • OCEAN > INDIAN OCEAN
  • OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN
  • OCEAN > PACIFIC OCEAN > SOUTH PACIFIC OCEAN
Project keywords Ocean Acidification Search Keywords
  • Ocean Carbon Data System (OCADS) Project
Keywords NCEI ACCESSION NUMBER
Use Constraints
  • Cite as: Lauvset, S.K.; Tanhua, T. (2018). Matlab Toolbox to Perform Secondary Quality Control (2nd QC) on Hydrographic Data (NCEI Accession 0164484). NOAA National Centers for Environmental Information. Unpublished Dataset. [access date]
Access Constraints
  • NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose.
Fees
  • Digital data may be downloaded from NCEI at no charge in most cases. For custom orders of digital data or to obtain a copy of analog materials, please contact NCEI Information Services for information about current fees.
Acquisition Information (collection)
Instrument
  • Carbon dioxide (CO2) gas analyzer
  • pH sensors
  • titrator
Last Modified: 2018-08-11T19:37:09
For questions about the information on this page, please email: NODC.DataOfficer@noaa.gov