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  • Other Sources  (11)
  • American Association for the Advancement of Science (AAAS)
  • 1995-1999  (5)
  • 1980-1984  (3)
  • 1975-1979  (3)
  • 1
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    Estimates of Cenozoic Oceanic Sedimentation Rates (1977)
    American Association for the Advancement of Science (AAAS)
    In:  Science, 197 (4298). pp. 53-55.
    Details
    Publication Date: 2018-02-07
    Description: Estimation of average Cenozoic sedimentation rates for the Atlantic, Indian, and Pacific oceans indicates global synchronous fluctuations. Paleocene-early Eocene and late Eocene-early Miocene rates are only a fraction of middle Eocene and middle Miocene-Recent rates. These changes must reflect significantly different modes of continental weathering, which may be due to alternate states of atmospheric circulation marked by reduction of global precipitation.
    Type: Article , PeerReviewed
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  • 2
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    Nautilus Growth and Longevity: Evidence from Marked and Recaptured Animals (1984)
    American Association for the Advancement of Science (AAAS)
    In:  Science, 224 (4652). pp. 990-992.
    Details
    Publication Date: 2019-03-19
    Description: Study of Nautilus belauensis i its natural habitat in Palau, West Caroline Islands, shows that growth is slow (0.1 millimeter of shell per day on the average) and decreases as maturity is approached and that individuals may live at least 4 years beyond maturity. Age estimates for seven animals marked and recaptured between 45 and 355 days after release range from 14.5 to 17.2 years. These data indicate that the life-span of Nautilus may exceed 20 years and that its life strategy is very different from that of other living cephalopods.
    Type: Article , PeerReviewed
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  • 3
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    Calcium Carbonate Hexahydrate from Organic-Rich Sediments of the Antarctic Shelf: Precursors of Glendonites (1982)
    American Association for the Advancement of Science (AAAS)
    In:  Science, 216 (4550). pp. 1128-1131.
    Details
    Publication Date: 2018-03-08
    Description: Large euhedral crystals of calcium carbonate hexahydrate were recovered from a shelf basin of the Bransfield Strait, Antarctic Peninsula, at a water depth of 1950 meters and sub-zero bottom water temperatures. The chemistry, mineralogy, and stable isotope composition of this hydrated calcium carbonate phase, its environment of formation, and its mode of precipitation confirm the properties variously attributed to hypothetical precursors of the glendonites and thereby greatly expand their use in paleoceanographic interpretation.
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  • 4
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    Detection of Overflow Events in the Shag Rocks Passage, Scotia Ridge (1981)
    American Association for the Advancement of Science (AAAS)
    In:  Science, 213 (4512). pp. 1113-1114.
    Details
    Publication Date: 2019-01-21
    Description: During an almost yearlong period of observations made with a current meter in the fracture zone between the Falkland Islands (Islas Malvinas) and South Georgia, several overflow events were recorded at a depth of 3000 meters carrying cold bottom water from the Scotia Sea into the Argentine Basin. The outflow bursts of Scotia Sea bottom water, a mixing product of Weddell Sea and eastern Pacific bottom water, were associated with typical speeds of more than 28 centimeters per second toward the northwest and characteristic temperatures below 0.6°C. The maximum 24-hour average speed of 65 centimeters per second, together with a temperature of 0.29°C, was encountered on 14 November 1980 at a water depth of 2973 meters, 35 meters above the sea floor.
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  • 5
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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
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  • 6
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    Glacial Climate in the Tropics (1996)
    American Association for the Advancement of Science (AAAS)
    In:  Science, 272 (5270). pp. 1902-1904.
    Details
    Publication Date: 2016-06-16
    Description: During glacial cycles, different parts of the Earth cool by different amounts. A growing collection of evidence has begun to show that cooling in the tropical oceans was greater than previously thought. In his Perspective, Broecker discusses the oxygen isotope evidence reported by Schrag et al. (p. 1930) that indicates that the cooling in deep tropical water was close to the freezing point.
    Type: Article , PeerReviewed
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  • 7
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    Bioluminescent countershading in midwater animals: evidence from living squid (1976)
    American Association for the Advancement of Science (AAAS)
    In:  Science, 191 (4231). pp. 1046-1048.
    Details
    Publication Date: 2020-05-08
    Description: Midwater squid respond to overhead illumination by turning on numerous downward-directed photophores; they turn off the photophores when overhead illumination is eliminated. The squid are invisible when the intensity of the photophores matches the intensity of the overhead illumination. These results strongly support the theory of ventral bioluminescent countershading.
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  • 8
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    Decadal Trends in the North Atlantic Oscillation: Regional Temperatures and Precipitation (1995)
    American Association for the Advancement of Science (AAAS)
    In:  Science, 269 (5224). pp. 676-679.
    Details
    Publication Date: 2019-05-10
    Description: Greenland ice-core data have revealed large decadal climate variations over the North Atlantic that can be related to a major source of low-frequency variability, the North Atlantic Oscillation. Over the past decade, the Oscillation has remained in one extreme phase during the winters, contributing significantly to the recent wintertime warmth across Europe and to cold conditions in the northwest Atlantic. An evaluation of the atmospheric moisture budget reveals coherent large-scale changes since 1980 that are linked to recent dry conditions over southern Europe and the Mediterranean, whereas northern Europe and parts of Scandinavia have generally experienced wetter than normal conditions.
    Type: Article , PeerReviewed
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  • 9
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    Strontium-Calcium Thermometry in Coral Skeletons (1979)
    American Association for the Advancement of Science (AAAS)
    In:  Science, 204 (4391). pp. 404-407.
    Details
    Publication Date: 2019-05-24
    Description: The strontium to calcium ratio of skeletal aragonite in three genera of reef-building corals varies as a simple function of temperature and the strontium to calcium ratio of the incubation water. The strontiumlcalcium distribution coefficients of coral aragonite apparently differ from the corresponding coefficient of inorganically precipitated aragonite. With some care, coral skeletons can be used as recording thermometers.
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  • 10
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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.
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  • 11
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    Is Warming Trend Harming Penguins? (1997)
    American Association for the Advancement of Science (AAAS)
    In:  Science, 276 (5320). p. 1790.
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    Publication Date: 2021-04-15
    Type: Article , PeerReviewed
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