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A Toolbox for secondary quality control on ocean chemistry and hydrographic data (NCEI Accession 0209357)

Published by NOAA National Centers for Environmental Information | National Oceanic and Atmospheric Administration, Department of Commerce | Catalog Last Checked: September 26, 2026 at 09:18 PM | Dataset Last Updated: April 21, 2025 at 12:00 AM
This dataset contains MatLab files for a Toolbox for secondary quality control (2nd QC) on ocean chemistry and hydrographic data. 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 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.

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0209357 CHLOROFLUOROCARBON (CFC) DISSOLVED INORGANIC CARBON (DIC) NUTRIENTS OXYGEN partial pressure of carbon dioxide - water pH SALINITY

Complete Metadata
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describedByType application/octet-stream
description This dataset contains MatLab files for a Toolbox for secondary quality control (2nd QC) on ocean chemistry and hydrographic data. 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 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.
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identifier https://data.noaa.gov/waf/NOAA/NESDIS/ncei/accessions/iso/xml/0209357.xml
issued 2020-03-26T00:00:00.000+00:00
keyword 
[
  "0209357",
  "CHLOROFLUOROCARBON (CFC)",
  "DISSOLVED INORGANIC CARBON (DIC)",
  "NUTRIENTS",
  "OXYGEN",
  "partial pressure of carbon dioxide - water",
  "pH",
  "SALINITY",
  "total alkalinity",
  "WATER TEMPERATURE",
  "carbon dioxide (CO2) gas analyzer",
  "CTD",
  "Niskin bottle",
  "titrator",
  "chemical",
  "discrete sample",
  "physical",
  "profile",
  "UNKNOWN PLATFORMS OF USSR",
  "Bjerknes Centre for Climate Research",
  "GEOMAR Helmholtz Centre for Ocean Research Kiel",
  "University of Bergen",
  "Climate Variability and Predictability (CLIVAR)",
  "GLOBAL OCEAN DATA ANALYSIS PROJECT (GLODAP)",
  "The Global Ocean Ship-based Hydrographic Investigations Program (GO-SHIP)",
  "World Ocean Circulation Experiment (WOCE)",
  "World-Wide Distribution",
  "oceanography",
  "BJERKNES > Bjerknes Centre for Climate Research",
  "DE/GEOMAR > GEOMAR - Helmholtz Centre for Ocean Research Kiel, Germany",
  "CLIVAR > Climate Variability",
  "GLODAP > Global Ocean Data Analysis Project",
  "WOCE > World Ocean Circulation Experiment",
  "Ocean Carbon and Acidification Data System (OCADS) Project",
  "EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC CHEMISTRY > HALOCARBONS AND HALOGENS > CHLOROFLUOROCARBONS",
  "EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > ALKALINITY",
  "EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > CARBON DIOXIDE",
  "EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > DISSOLVED GASES",
  "EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > HYDROCARBONS",
  "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",
  "Discrete measurement",
  "Hydrographic and chemical data",
  "CO2 ANALYZERS > CO2 ANALYZERS",
  "CTD > Conductivity, Temperature, Depth",
  "NISKIN BOTTLES",
  "Ships",
  "GEOGRAPHIC REGION > GLOBAL OCEAN",
  "World Ocean"
]
landingPage https://www.ncei.noaa.gov/contact
language 
[]
license https://creativecommons.org/publicdomain/zero/1.0/
modified 2025-04-21T00:00:00.000+00:00
publisher 
{
  "name": "NOAA National Centers for Environmental Information",
  "@type": "org:Organization"
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references 
[
  "https://doi.org/10.1002/lom3.10050",
  "https://www.ncei.noaa.gov/access/ocean-carbon-acidification-data-system/oceans/2nd_QC_Tool/",
  "https://www.ncei.noaa.gov/products/ocean-carbon-acidification-data-system"
]
rights otherRestrictions
spatial 180.0,-90.0,-180.0,90.0
temporal 2000-01-01T00:00:00+00:00/2020-03-01T00:00:00+00:00
theme 
[
  "geospatial"
]
title A Toolbox for secondary quality control on ocean chemistry and hydrographic data (NCEI Accession 0209357)

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