科研之友
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摘要
<jats:title>Abstract</jats:title><jats:p>Corals of the Hawaiian Archipelago are well situated in the North Pacific Gyre (NPG) to record how bomb-produced radiocarbon has been sequestered and transported by the sea. While this signal can be traced accurately through time in reef-building corals and used to infer oceanographic processes and determine the ages of marine organisms, a comprehensive and validated record has been lacking for the Hawaiian Archipelago. In this study, a coral core from Kure Atoll in the northwestern Hawaiian Islands was used to create a high-resolution bomb<jats:sup>14</jats:sup>C record for the years 1939–2002, and was then used with other<jats:sup>14</jats:sup>C measurements in fish otoliths and seawater to explore differences and similarities in the bomb<jats:sup>14</jats:sup>C signal throughout the Hawaiian Archipelago. The Kure Atoll sample series produced a well-defined bomb<jats:sup>14</jats:sup>C curve that, with some exceptions, was similar to other coral<jats:sup>14</jats:sup>C records from the Hawaiian Archipelago. Subtle differences in the coral<jats:sup>14</jats:sup>C records across the region may be explained by the large-scale ocean circulation patterns and decadal cycles of the NPG. The most rapid increase of<jats:sup>14</jats:sup>C, in the 1950s and 1960s, showed similar timing across the Hawaiian Archipelago and provides a robust basis for use of bomb<jats:sup>14</jats:sup>C dating to obtain high-precision age determinations of marine organisms. Reference otoliths of juvenile fish demonstrated the use of the post-peak<jats:sup>14</jats:sup>C decline period as a viable reference in the age validation of younger and more recently collected fishes, and effectively extended the utility of bomb<jats:sup>14</jats:sup>C dating to the latest 30 yr.</jats:p>
- 出版日期2016-9
