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  • Other Sources  (2)
  • American Association for the Advancement of Science (AAAS)
  • 1995-1999  (2)
  • 1999  (2)
  • 1998
  • 1
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    A Possible 20th-Century Slowdown of Southern Ocean Deep Water Formation (1999)
    American Association for the Advancement of Science (AAAS)
    In:  Science, 286 (5442). pp. 1132-1135.
    Details
    Publication Date: 2016-06-10
    Description: Chlorofluorocarbon-11 inventories for the deep Southern Ocean appear to confirm physical oceanographic and geochemical studies in the Southern Ocean, which suggest that no more than 5 × 106 cubic meters per second of ventilated deep water is currently being produced. This result conflicts with conclusions based on the distributions of the carbon-14/carbon ratio and a quasi-conservative property, PO4 *, in the deep sea, which seem to require an average of about 15 × 106cubic meters per second of Southern Ocean deep ventilation over about the past 800 years. A major reduction in Southern Ocean deep water production during the 20th century (from high rates during the Little Ice Age) may explain this apparent discordance. If this is true, a seesawing of deep water production between the northern Atlantic and Southern oceans may lie at the heart of the 1500-year ice-rafting cycle.
    Type: Article , PeerReviewed
    Format: text
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  • 2
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    Geochemical Consequences of Increased Atmospheric Carbon Dioxide on Coral Reefs (1999)
    American Association for the Advancement of Science (AAAS)
    In:  Science, 284 (5411). pp. 118-120.
    Details
    Publication Date: 2019-05-10
    Description: A coral reef represents the net accumulation of calcium carbonate (CaCO3) produced by corals and other calcifying organisms. If calcification declines, then reef-building capacity also declines. Coral reef calcification depends on the saturation state of the carbonate mineral aragonite of surface waters. By the middle of the next century, an increased concentration of carbon dioxide will decrease the aragonite saturation state in the tropics by 30 percent and biogenic aragonite precipitation by 14 to 30 percent. Coral reefs are particularly threatened, because reef-building organisms secrete metastable forms of CaCO3, but the biogeochemical consequences on other calcifying marine ecosystems may be equally severe.
    Type: Article , PeerReviewed
    Format: text
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