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  • Ocean oxygen and nutrients
  • Deep-water
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  • 1
    Publication Date: 2022-05-25
    Description: This paper is not subject to U.S. copyright. The definitive version was published in Deep Sea Research Part I: Oceanographic Research Papers 74 (2013): 48-63, doi:10.1016/j.dsr.2012.12.005.
    Description: Detection and attribution of hydrographic and biogeochemical changes in the deep ocean are challenging due to the small magnitude of their signals and to limitations in the accuracy of available data. However, there are indications that anthropogenic and climate change signals are starting to manifest at depth. The deep ocean below 2000 m comprises about 50% of the total ocean volume, and changes in the deep ocean should be followed over time to accurately assess the partitioning of anthropogenic carbon dioxide (CO2) between the ocean, terrestrial biosphere, and atmosphere. Here we determine the changes in the interior deep-water inorganic carbon content by a novel means that uses the partial pressure of CO2 measured at 20 °C, pCO2(20), along three meridional transects in the Atlantic and Pacific oceans. These changes are measured on decadal time scales using observations from the World Ocean Circulation Experiment (WOCE)/World Hydrographic Program (WHP) of the 1980s and 1990s and the CLIVAR/CO2 Repeat Hydrography Program of the past decade. The pCO2(20) values show a consistent increase in deep water over the time period. Changes in total dissolved inorganic carbon (DIC) content in the deep interior are not significant or consistent, as most of the signal is below the level of analytical uncertainty. Using an approximate relationship between pCO2(20) and DIC change, we infer DIC changes that are at the margin of detectability. However, when integrated on the basin scale, the increases range from 8–40% of the total specific water column changes over the past several decades. Patterns in chlorofluorocarbons (CFCs), along with output from an ocean model, suggest that the changes in pCO2(20) and DIC are of anthropogenic origin.
    Description: Rik Wanninkhof, Geun-Ha Park, John L. Bullister, and Richard A. Feely appreciate the support from the NOAA Office of Atmospheric and Oceanic Research and the Climate Observation Division. S.C.D. acknowledges support from NOAA Grant NA07OAR4310098. T.T. has been supported by grants from NSF and NOAA.
    Keywords: Ocean ; Carbon dioxide ; CO2 sink ; Anthropogenic carbon ; Deep-water
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: application/pdf
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  • 2
    Publication Date: 2022-05-25
    Description: Author Posting. © The Author(s), 2015. This is the author's version of the work. It is posted here for personal use, not for redistribution. The definitive version was published in Annual Review of Marine Science 8 (2016): 185-215, doi:10.1146/annurev-marine-052915-100829.
    Description: The ocean, a central component of Earth’s climate system, is changing. Given the global scope of these changes, highly accurate measurements of physical and biogeochemical properties need to be conducted over the full water column, spanning the ocean basins from coast to coast, and repeated every decade at a minimum, with a ship-based observing system. Since the late 1970s, when the Geochemical Ocean Sections Study (GEOSECS) conducted the first global survey of this kind, the World Ocean Circulation Experiment (WOCE) and Joint Global Ocean Flux Study (JGOFS), and now the Global Ocean Ship-based Hydrographic Investigations Program (GO-SHIP) have collected these “reference standard” data that allow quantification of ocean heat and carbon uptake, and variations in salinity, oxygen, nutrients, and acidity on basin scales. The evolving GO-SHIP measurement suite also provides new global information about dissolved organic carbon, a large bioactive reservoir of carbon.
    Description: Climate Observations Division of the U.S. NOAA Climate Program Office and NOAA Research; Joint Institute for the Study of the Atmosphere and Ocean (JISAO) under NOAA Cooperative Agreement NA10OAR4320148; U.S. National Science Foundation [OCE- 0223869; OCE-0752970; OCE-0825163; OCE-1434000; OCE 0752972; OCE-0752980; OCE-1232962; OCE-1155983; OCE-1436748]; U.S. CLIVAR Project Office; Global Environment and Marine Department, Japan Meteorological Agency; Australian Climate Change Science Program (Australian Department of Environment and CSIRO); U.K. Natural Environment Research Council; European Union’s FP7 grant agreement 264879 (CarboChange); Horizon 2020 grant agreement No 633211; ETH Zurich Switzerland.
    Keywords: Anthropogenic climate change ; Ocean temperature change ; Salinity change ; Ocean carbon cycle ; Ocean oxygen and nutrients ; Ocean chlorofluorocarbons ; Ocean circulation change ; Ocean mixing
    Repository Name: Woods Hole Open Access Server
    Type: Preprint
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