The atypical interglacial of MIS 11c and the long-term change in interglacial intensity over the past 800 kyr

11 interglacials have been identified in the past 800 kyr. Around 430 ka BP, a change in interglacial strength, known as the Mid-Brunhes Event (MBE), was observed in atmospheric CO2 levels, and in proxy records of Antarctic and global surface temperatures, marking a transition to stronger interglacials, such as Marine Isotope Stages (MISs) 5e and 11c. While the onset of interglacials seems linked to an increased Northern Hemisphere summer insolation, uncertainties persist due to complex interactions involving astronomical forcing, ice volume, CO2 levels, and temperature.