Jeroen Groeneveld

TL;DR: In this article, an interlaboratory study of Mg/Ca and Sr/Ca ratios in three commercially available carbonate reference materials (BAM RS3, CMSI 1767, and ECRM 752-1) was performed with the participation of 25 laboratories that determine foraminiferal Mg /Ca ratios worldwide.

TL;DR: The authors showed that the increase in North Atlantic meridional overturning circulation between 4.8 and 4.0 million years ago, initiated by the progressive closure of the Central American Seaway, triggered overall shoaling of the tropical thermocline and preconditioned the turnaround from a warm eastern equatorial Pacific to the modern equatorial cold tongue state about 1 million years earlier than previously assumed.

TL;DR: The results from sediment trap experiments conducted in the seasonal upwelling area off south Java from November 2000 until July 2003 revealed significant monsoon-, El Nino-Southern Oscillation and Indian Ocean Dipole-induced seasonal and interannual variations in flux and shell geochemistry of planktonic foraminifera as discussed by the authors.

TL;DR: In this paper, the dissolution effect on foraminiferal Mg/Ca ratios was assessed in the Caribbean core top from ∼900-4700 m water depth and it was shown that dissolution-affected foraminifera start to decline linearly below Δ[CO32−] levels of ∼18-26 μmol/kg by ∼0.04-0.11 mmol/mol.

TL;DR: A conceptual model for the glaciation and deglaciation of MIS M2 is proposed based on geochemical and palynological records from five marine sediment cores along a Caribbean to eastern North Atlantic transect, showing that heat transport via the North Atlantic Current was crucial in maintaining warm climates comparable to those predicted for the end of this century.