Late MIS3 to modern central Arctic paleoceanography based on ostracode faunal assemblages

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http://abstractsearch.agu.org/meetings/2016/FM/PP13A-2059.html
Author(s): Gemery, Laura; Cronin, Thomas M.; Jakobsson, Martin; Poirier, Robert K.; Pearce, Christof; Barrientos, Natalia
Author Affiliation(s): Primary:
U. S. Geological Survey, Reston, VA, United States
Other:
Stockholm University, Sweden
Volume Title: AGU 2016 fall meeting
Source: American Geophysical Union Fall Meeting, Vol.2016; American Geophysical Union 2016 fall meeting, San Francisco, CA, Dec. 12-16, 2016. Publisher: American Geophysical Union, Washington, DC, United States
Note: In English
Summary: Continuous, highly abundant and well preserved fossil ostracodes were studied in one to two centimeter intervals from AMS-dated cores collected on the Lomonosov Ridge that indicate varying oceanographic conditions during the last ∼40 ka. Ostracode assemblages from cores taken during the SWERUS 2014 Expedition, Leg 2, reflect paleoenvironmental changes during glacial, deglacial, and interglacial transitions including changes in sea-ice cover and inflow of Atlantic-derived water into the Eurasian Basin. Notably, SWERUS 2014 obtained ridge, slope and shelf cores in relatively poorly studied regions of the Arctic. The composition of benthic ostracode assemblages from a multicore and complimentary gravity core (32 MUC4; 85.14, 151.59, in 837 mwd and 32 GC2, section 1, 85.15, 151.66 in 826 mwd), were analyzed and compared to prior results from various central Arctic expeditions to the Mendeleev, Northwind and Lomonosov Ridges. Key taxa used as indicators of specific water masses include: Acetabulastoma arcticum and Pseudocythere caudata (perennial sea ice), Polycope spp. (productivity and sea ice), Krithe hunti (partially sea-ice free conditions, deep water formation), and Rabilimis mirabilis (Atlantic water influx). Results indicate seasonally sea-ice free conditions during MIS 3 and less LGM ice cover than in more central regions of the Arctic. Intermittent periods of perennial sea ice began to develop during the late Holocene.
Year of Publication: 2016
Research Program: DSDP Deep Sea Drilling Project
Key Words: 24 Surficial Geology, Quaternary Geology; Arctic Ocean; Arthropoda; Atlantic Ocean; Cenozoic; Crustacea; Deep Sea Drilling Project; Last glacial maximum; Leg 2; Mandibulata; Microfossils; North Atlantic; Ostracoda; Paleoclimatology; Quaternary
Coordinates: N190000 N360000 W0253000 W0680000
Record ID: 2018007984
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