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Investigation of the paleoclimate of the Mendeleev Ridge in the western Arctic Ocean using beryllium isotopes

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Title
Investigation of the paleoclimate of the Mendeleev Ridge in the western Arctic Ocean using beryllium isotopes
Authors
Kim, Kyeong Ja
Nam, Seung-Il
Jull, A.J.Timothy
Issue Date
2015
Citation
Kim, Kyeong Ja, Seung-Il Nam, and A. J. Timothy Jull. 2015. Investigation of the paleoclimate of the Mendeleev Ridge in the western Arctic Ocean using beryllium isotopes. 8th International Conference on Asian Marine Geology (ICAMG-8), JeJu. 2015.10.05-10.
Abstract
We investigated paleoclimate and environmental changes using beryllium isotopes from the 39 cm-long box core sediment obtained from the Mendeleev Ridge of the western Arctic Ocean. The age of core PS72/396-3 seems to be back < 100 kyr based on stratigraphy of beryllium isotopes and paleomagnetic data and other isotopic data of this study, AMS 14C ages and oxygen and carbon isotopes of planktonic foraminifer N. pachyderma sin. The both authigenic 10Be and 9Be records show that there are three major cold periods during the last 100 kyr and reveals a much longer warm period after the second cold period based on 9Be record. The 10Be stratigraphy also reveals a paleomagetic excursion at ~45 kyr which is comparable with the record of δ18O. At depth from 22 to 25 cm, the lowest 10Be signal may be due to the highest paleomagnetic intensity, which is indicated as an age of 75 kyr elsewhere. However, cold climate signal such as ice coverage could be possible because δ18O reveals a cold period. Interestingly, 9Be data show that constant input of 9Be to the Mendeleev Ridge is clearly observed for this time period. This could be associated in warmer climate which provided constant 9Be input to the marine environment from the land. During this time period, TOC (%) values also show a similar pattern. The record of authigenic 9Be is inversely correlated to that of Ca and proportional to opal production. These observations confirm that 9Be can be a good proxy for climatic tracer. This study may be a useful approach for understanding Arctic climate change for the Mendeleev Ridge as well as global paleoclimate changes during the late quaternary glacial-interglacial cycles.
Conference Name
8th International Conference on Asian Marine Geology (ICAMG-8)
Conference Place
JeJu
Conference Date
2015.10.05-10.
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