Multi-spatial variability modes of the Atlantic Meridional Overturning Circulation
ZHOU Tianjun LASG, institute of Atmospheric Physics. Chinese Academy of Sciences, Beijing 100029. China
The multi-spatial variability modes of the At- lantic Meridional Overturning Circulation (MOO are iden- tified in the natural coupled simulation of two climate models, the MOC either oscillates at decadal scales with strong cross- equatorial flow or fluctuates locally at interannual scales with weaker cross-equatorial flow. Former studies mainly emphasize the paleo-environmental and paleo-climatic im- pacts of the meridional overturning states transition; this analysis indicates the existence of the multi-spatial variability modes of the MOC at interannual to decadal scales. Further analysis indicates that the conventionally used MOC index, which is defined as the maximum zonal mean meridional stream-function of the North Atlantic, cannot properly de- scribe the multi-spatial variability characteristics of the MOC.