| Автор | Sowers, Todd |
| Автор | Bender, Michael |
| Автор | Labeyrie, Laurent |
| Автор | Martinson, Doug |
| Автор | Jouzel, Jean |
| Автор | Raynaud, Dominique |
| Автор | Pichon, Jean Jacques |
| Автор | Korotkevich, Yevgeniy Sergeevich |
| Дата выпуска | 1993 |
| dc.description | The object of the present study is to introduce a means of comparing the Vostok and marine chronologies. Our strategy has been to use the δ<sup>18</sup>O of atmospheric O<sub>2</sub> (denoted δ<sup>18</sup>O<sub>atm</sub>) from the Vostok ice core as a proxy for the δ<sup>18</sup>O of seawater (denoted δ<sup>18</sup>O<sub>sw</sub>). Our underlying premise in using δ<sup>18</sup>O<sub>atm</sub> as a proxy for δ<sup>18</sup>O<sub>sw</sub> is that past variations in δ<sup>18</sup>O<sub>sw</sub> (an indicator of continental ice volume) have been transmitted to the atmospheric O<sub>2</sub> reservoir by photosynthesizing organisms in the surface waters of the world's oceans. We compare our record of δ<sup>18</sup>O<sub>atm</sub> to the δ<sup>18</sup>O<sub>sw</sub> record which has been developed from studies of the isotopic composition of biogenic calcite (δ<sup>18</sup>O<sub>foram</sub>) in deep‐sea cores. We have tied our δ<sup>18</sup>O<sub>atm</sub> record from Vostok to the SPECMAP timescale throughout the last 135 kyr by correlating δ<sup>18</sup>O<sub>atm</sub> with a δ<sup>18</sup>O<sub>sw</sub> record from V19‐30. Results of the correlation indicate that 77% of the variance is shared between these two records. We observed differences between the δ<sup>18</sup>O<sub>atm</sub> and the δ<sup>18</sup>O<sub>sw</sub> records during the coldest periods, which indicate that there have been subtle changes in the factors which regulate δ<sup>18</sup>O<sub>atm</sub> other than δ<sup>18</sup>O<sub>sw</sub>. Our use of δ<sup>18</sup>O<sub>atm</sub> as a proxy for δ<sup>18</sup>O<sub>sw</sub> must therefore be considered tentative, especially during these periods. By correlating δ<sup>18</sup>O<sub>atm</sub> with δ<sup>18</sup>O<sub>sw</sub>, we provide a common temporal framework for comparing phase relationships between atmospheric records (from ice cores) and oceanographic records constructed from deep‐sea cores. Our correlated age‐depth relation for the Vostok core should not be considered an absolute Vostok timescale. We consider it to be the preferred timescale for comparing Vostok climate records with marine climate records which have been placed on the SPECMAP timescale. We have examined the fidelity of this common temporal framework by comparing sea surface temperature (SST) records from sediment cores with an Antarctic temperature record from the Vostok ice core. We have demonstrated that when the southern ocean SST and Antarctic temperature records are compared on this common temporal framework, they show a high degree of similarity. We interpret this result as supporting our use of the common temporal framework for comparing other climate records from the Vostok ice core with any climate record that has been correlated into the SPECMAP chronology. |
| Формат | application.pdf |
| Копирайт | Copyright 1993 by the American Geophysical Union. |
| Тема | ATMOSPHERIC PROCESSES |
| Тема | Paleoclimatology |
| Тема | OCEANOGRAPHY: GENERAL |
| Тема | 4267 |
| Тема | OCEANOGRAPHY: PHYSICAL |
| Тема | General circulation |
| Тема | OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL |
| Тема | Marine organic chemistry |
| Тема | INFORMATION RELATED TO GEOLOGIC TIME |
| Тема | Cenozoic |
| Название | A 135,000‐year Vostok‐Specmap Common temporal framework |
| Тип | article |
| DOI | 10.1029/93PA02328 |
| Electronic ISSN | 1944-9186 |
| Print ISSN | 0883-8305 |
| Журнал | Paleoceanography |
| Том | 8 |
| Первая страница | 737 |
| Последняя страница | 766 |
| Выпуск | 6 |
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