Uemura, R.;
Yoshida, N.;
Kurita, N.;
Nakawo, M.;
Watanabe, O.
An observation‐based method for reconstructing ocean surface changes using a 340,000‐year deuterium excess record from the Dome Fuji ice core, Antarctica
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Medientyp:
E-Artikel
Titel:
An observation‐based method for reconstructing ocean surface changes using a 340,000‐year deuterium excess record from the Dome Fuji ice core, Antarctica
Beteiligte:
Uemura, R.;
Yoshida, N.;
Kurita, N.;
Nakawo, M.;
Watanabe, O.
Erschienen:
American Geophysical Union (AGU), 2004
Beschreibung:
<jats:p>An extended deuterium excess (<jats:italic>d</jats:italic> or d‐excess) record covering the last three glacial‐interglacial cycles (ca. 340,000 years) was obtained from the Dome Fuji ice core, Antarctica. In order to interpret the Antarctic <jats:italic>d</jats:italic> record as a climatic history of vapor source regions, the record should be corrected for the Antarctic site temperature effect. We propose an observation‐based method for correcting the <jats:italic>d</jats:italic> record. That method uses a regression curve of the observed spatial relationship between δD and <jats:italic>d</jats:italic> in Antarctica on the assumption that the present slope has not changed. Unlike the previously proposed model‐based method, our correction method results in considerable change in the <jats:italic>d</jats:italic> profile of the Dome Fuji ice core. The corrected <jats:italic>d</jats:italic> record anticorrelates with a mean ocean δ<jats:sup>18</jats:sup>O record (R<jats:sup>2</jats:sup> = 0.74) and correlates with a SST record (R<jats:sup>2</jats:sup> = 0.58) throughout the observed period. These results emphasize the significance of our empirical correction method.</jats:p>