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Pb and Sr isotopic evidence of Saharan dust during the Last Glacial Maximum in the NEEM ice core, Greenland

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Title
Pb and Sr isotopic evidence of Saharan dust during the Last Glacial Maximum in the NEEM ice core, Greenland
Other Titles
그린란드 NEEM 빙하코어에 나타난 최대빙하기 사하라 지각먼지 유입의 납 및 동위원소 비 증거
Authors
Han, Changhee
Hong, Sungmin
Hur, Soon Do
Chung, Ji Woong
Lee, Khanghyun
Han, Yeongcheol
Keywords
그린란드 NEEM 빙하코어; 납 스트론튬 동위원소 비
Issue Date
2017
Citation
Han, Changhee, et al. 2017. Pb and Sr isotopic evidence of Saharan dust during the Last Glacial Maximum in the NEEM ice core, Greenland. 추계 지질과학 연합 학술대회. 제주 컨벤션센터. 2017.10.25~2017.10.27.
Abstract
Pb and Sr isotopes were analyzed in the core sections from the NEEM (North Greenland Eemian Ice Drilling) ice core (~8?30.8 kyr b2k)? to identify the potential sources of dust transported to northwestern Greenland during the glacial period using a thermal ionization mass spectrometer (TIMS; TRITON, Thermo Scientific). Our data are the first high-resolution record of Pb and Sr isotopic composition obtained from the Greenland deep ice core, providing the characteristics of climate-related changes in concentrations and isotopic compositions. Previous isotopic studies suggested that the source of dust deposited in Greenland originated from Chinese deserts during the cooler periods and/or from glacial sediments adjacent to Greenland in warmer periods of the glacial period. However, the isotopic compositions of Sr determined in NEEM ice core show that dust in Greenland could have originated from the Sahara and Taklamakan deserts during the cold Greenland Stadial (GS). During the GS-2, the Last Glacial maximum (LGM), the isotopic ratios of the insoluble fractions are observed to be less radiogenic than the values in the silicate fractions. Sr isotopic composition coupled with Pb isotopic ratios suggests that the Sahara was the dominant source area of glacial dust in the NEEM ice core. Our high-resolution isotopic results provides the first evidence that the Saharan dust can’t be ruled out as a potential sources of Greenland dust during glacial periods.
URI
http://repository.kopri.re.kr/handle/201206/8270
Conference Name
추계 지질과학 연합 학술대회
Conference Place
제주 컨벤션센터
Conference Date
2017.10.25~2017.10.27
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