دورية أكاديمية
Basal debris of the NEEM ice core, Greenland: a window into sub-ice-sheet geology, basal ice processes and ice-sheet oscillations
| العنوان: | Basal debris of the NEEM ice core, Greenland: a window into sub-ice-sheet geology, basal ice processes and ice-sheet oscillations |
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| المؤلفون: | Pierre-Henri Blard, Marie Protin, Jean-Louis Tison, François Fripiat, Dorthe Dahl-Jensen, Jørgen P. Steffensen, William C. Mahaney, Paul R. Bierman, Andrew J. Christ, Lee B. Corbett, Vinciane Debaille, Thomas Rigaudier, Philippe Claeys, ASTER Team |
| المصدر: | Journal of Glaciology, Vol 69, Pp 1011-1029 (2023) |
| بيانات النشر: | Cambridge University Press, 2023. |
| سنة النشر: | 2023 |
| المجموعة: | LCC:Environmental sciences LCC:Meteorology. Climatology |
| مصطلحات موضوعية: | Basal ice, glacial sedimentology, ice core, Environmental sciences, GE1-350, Meteorology. Climatology, QC851-999 |
| الوصف: | We present new data from the debris-rich basal ice layers of the NEEM ice core (NW Greenland). Using mineralogical observations, SEM imagery, geochemical data from silicates (meteoric 10Be, εNd, 87Sr/86Sr) and organic material (C/N, δ13C), we characterize the source material, succession of previous glaciations and deglaciations and the paleoecological conditions during ice-free episodes. Meteoric 10Be data and grain features indicate that the ice sheet interacted with paleosols and eroded fresh bedrock, leading to mixing in these debris-rich ice layers. Our analysis also identifies four successive stages in NW Greenland: (1) initial preglacial conditions, (2) glacial advance 1, (3) glacial retreat and interglacial conditions and (4) glacial advance 2 (current ice-sheet development). C/N and δ13C data suggest that deglacial environments favored the development of tundra and taiga ecosystems. These two successive glacial fluctuations observed at NEEM are consistent with those identified from the Camp Century core basal sediments over the last 3 Ma. Further inland, GRIP and GISP2 summit sites have remained glaciated more continuously than the western margin, with less intense ice-substratum interactions than those observed at NEEM. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 0022-1430 1727-5652 |
| Relation: | https://www.cambridge.org/core/product/identifier/S0022143022001228/type/journal_article; https://doaj.org/toc/0022-1430; https://doaj.org/toc/1727-5652 |
| DOI: | 10.1017/jog.2022.122 |
| URL الوصول: | https://doaj.org/article/0745c87b00e3461894becead77175cc5 |
| رقم الأكسشن: | edsdoj.0745c87b00e3461894becead77175cc5 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 00221430 17275652 |
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| DOI: | 10.1017/jog.2022.122 |