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Sea-ice dynamics in the Southern Norwegian Sea during the last glacial millennial climate events:insights from combined dinocyst and biomarkeranalyses

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Title
Sea-ice dynamics in the Southern Norwegian Sea during the last glacial millennial climate events:insights from combined dinocyst and biomarkeranalyses
Other Titles
마지막 빙하기 동안의 남부 노르웨이해에서의 해빙 다이내믹: dinocyst와 유기분자생체지표로 부터의 통찰
Authors
Wary, Melanie
Etourneau, Johan
Gal, Jong-Ku
Smik, Lukas
Matthiessen, Jens
Kang, Sujin
Belt, Simon
Sanchez Goni, Maria Fernanda
Shin, Kyung-Hoon
Kim, Jung-Hyun
Keywords
Sea-ice dynamics; Southern Norwegian Sea; biomarker; dinocyst
Issue Date
2019
Citation
Wary, Melanie, et al. 2019. Sea-ice dynamics in the Southern Norwegian Sea during the last glacial millennial climate events:insights from combined dinocyst and biomarkeranalyses. MedPalyno2019 :The Mediterranean Palynological Societies Symposium 2019. BORDEAUX. 2019.07.09~2019.07.11.
Abstract
Dansgaard{Oeschger and Heinrich events constitute ones of the most enigmatic features of the last glacial period. Many studies have focused on their characteristic millennial climate variability, testing atmosphere-cryosphere-ocean couplings, but major uncertainties and discrepancies still remain. A new scenario, mainly supported by dinocyst-derived paleore- constructions and freshwater hosing experiments, has recently emerged. Reconciling most of the up to now hypothesized theories, it suggests the occurrence of a regional paradoxical seesaw pattern: cold Greenland and North Atlantic phases coincide with warmer sea-surface conditions and shorter seasonal sea-ice cover durations in the Norwegian Sea, in relation to enhanced subsurface advection of warm Atlantic waters re-emerging in the Norwegian Sea. Here we provide new paleoreconstructions of sea-ice dynamics in the Southern Norwegian Sea (core MD95-2009), over the 35-27 ka BP interval encompassing four interstadials-stadials (including HS3) cycles, based for the rst time on the combination of biomarker IP25 con- centration and dinocyst-derived sea-ice cover duration. The striking correspondence, over the millennial climate shifts, between these reconstructions derived from two independent proxies, further provides robust evidence for the occurrence of this atypical hydrographical pattern. In contrast, the strong variability between the three PIP25 signals (calculated by combining IP25 concentration with either triene, brassicasterol, or dinosterol concentration), and between them and our two other independent indicators of sea-ice dynamics, highlights the need to better constrain the PIP25, a semi-quantitative proxy of seasonal sea-ice.
URI
https://repository.kopri.re.kr/handle/201206/12649
Conference Name
MedPalyno2019 :The Mediterranean Palynological Societies Symposium 2019
Conference Place
BORDEAUX
Conference Date
2019.07.09~2019.07.11
Appears in Collections  
2019-2019, Changes in environments and coastal geomorphology of Svalbard fjords, Arctic (19-19) / Nam, Seung-il (PN19090)
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