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- 저자 : Abhilash Nair (검색결과 1 건)
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Suhas S. Shetye,Rahul Mohan,Abhilash Nair 한국지질과학협의회 2014 Geosciences Journal Vol.18 No.2
We used silicoflagellate assemblage records to describethe polar frontal variability over the last 48kyr in the Indian sectorof the Southern Ocean. The studied core was collected onboardORV Sagar Nidhi from within the Polar frontal zone (PFZ) duringthe 4th Indian Scientific Expedition to Southern Ocean. The Polar frontis dominated by silica-rich sediments (diatoms and silicoflagellates). Silicoflagellates were dominated by Distephanus speculum andDictyocha fibula species. The biostratigraphic record of these silicoflagellateswas used qualitatively to examine past changes inpolar frontal variability in the Southern Ocean. Warming is indicatedby an increase (decrease) in Dictyocha sp. (Distephanus sp.) from theLGM to the Holocene. Dictyocha sp. abundance indicates warmertemperatures during 43–45 kyr and is nearly synchronous withthe warming event recorded in an Antarctic ice core. Dictyocha/Distephanus ratio also suggests a northern and southern shift inthe polar front during LGM and 43–45 kyr respectively. The southwarddisplacement of the frontal system is linked to an increase insea surface temperature as evidenced from the δ18O Byrd Antarcticice core data and solar insolation data. The low dust flux, higherδ18O and absence of an upwelling indicator diatom, Thallasionemanitzchoides during the Antarctic warming event also suggest strongerthermal stratification during the Antarctic warming event ascompared to LGM. The present study would improve our understandingof the frontal variability under future warming scenarios.
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