After participation in a ship expedition with RV SONNE to the North Pacific in summer 2018, the tasks include to reconstruct the spatial and temporal changes in near - surface and subsurface water temperatures in the North Pacific, salinity, thermocline depth, and water mass stratification of the upper oceanic surface using geochemical proxy parameters, e.g.
in planktic microfossils.
Millennial - scale glacial variability versus Holocene stability: Changes
in planktic and benthic foraminifera faunas and ocean circulation in the North Atlantic during the last 60,000 years.
Not exact matches
The systematics of boron isotopes
in foraminifera are discussed
in detail, including results from benthic and
planktic taxa, and models of boron incorporation, fractionation, and biomineralisation.
Peak abundances of the small subpolar
planktic foraminifer species Turborotalita quinqueloba found
in MIS 5e sediments from the southern Lomonosov Ridge close to the Greenland continental margin (Site GreenICE, Fig. 1), a region with a modern perennial sea ice cover, may indicate less sea ice than today45.
Furthermore, the total amounts of
planktic foraminifers are very similar to those determined
in Holocene sediments from these two cores (Supplementary Figs. 2 and 3), suggesting similar sea ice conditions during the LIG as during the latest Holocene (present).
The near absence of
planktic foraminifers
in the MIS 6 sediments of these cores (Supplementary Figs. 2 and 3) 56 also supports the interpretation of virtually no surface water productivity due to closed sea ice conditions.
There,
planktic δ18O records from cores MD95 - 2010 and MD99 - 2304 (for core locations see Fig. 7e) document a climatic optimum
in the early - middle part of the LIG between about 126 and 116 ka, related to a strong poleward extension of warm Atlantic Water61, 62, 64.