[MIS10-P14] Comparison of bi-stable regimes of the Atlantic Meridional Overturning Circulation under present-day and glacial climate using a climate model of intermediate complexity
Keywords:glacial climate, Atlantic Meridional Overturning Circulation, climate model
In this study, we first reproduced climate conditions of present-day (CTL) and last glacial maximum (LGM) using MIROC-lite and then investigated the responses of the AMOC to changes of freshwater flux in North Atlantic under both CTL and LGM climate. Both experiments show the bi-stable regime of the AMOC and two stable modes under the same freshwater input. However, as indicated in Ganopolski and Rahmstorf (2001), our results also show that there are differences in details about bi-stable regimes between CTL and LGM climate. CTL climate with no freshwater input has "on mode", the current status, and "off mode", where doesn't exist the AMOC. On the other hand, LGM climate has two modes each of which has the AMOC of different magnitude, "on mode" and "weak mode". In our presentation, we discuss these results in detail.