Millennial-scale tropical atmospheric and Atlantic Ocean circulation change from the Last Glacial Maximum and Marine Isotope Stage 3

摘要: Abstract Abrupt, millennial-scale climate oscillations, known as Dansgaard–Oeschger (D–O) cycles, characterized the system of last glacial period. Although proxy evidence shows that D–O cycles resulted in large-scale changes atmospheric circulation patterns around planet, an understanding how Atlantic Meridional Overturning Circulation (AMOC) varied across these events remains unclear. Here, we take advantage fact both tropical corresponding to north–south shifts Intertropical Convergence Zone (ITCZ) and ocean associated with AMOC variability can be reconstructed same sediment core from Florida Straits examine relationship between events. To reconstruct surface water conditions, Mg/Ca-paleothermometry stable isotope measurements were combined on planktonic foraminifera Globigerinoides ruber (white variety) KNR166-2 JPC26 (24°19.61′N, 83°15.14′W; 546 m depth) a high-resolution record sea temperature δ O seawater 18 (a for upper mixed layer salinity) during Marine Isotope Stages (MIS) 2 3 20–35 ka BP. As additional column salinity change, also generate faunal abundance salinity-sensitive Neogloboquadrina dutertrei. Our results suggest rapid reductions occurred at onset interstadials, while stadials are by increased salinities. The most likely cause was variation strength position ITCZ Finally, recorded records inferred benthic our core. provide some first did vary least one MIS 3.