![]() However, some previous studies suggest that the AMOC variability is not coherent between the subtropical and subpolar gyres in the North Atlantic on interannual time scales from modeling studies (Baehr et al., 2009 Bingham et al., 2007), 19-year-long ocean state estimates (Wunsch & Heimbach, 2013), and 9-year-long seasonal observations (Mielke et al., 2013). The modern AMOC has been continuously monitored by the RAPID array at 26.5°N, starting in 2004 (Cunningham et al., 2007). The Atlantic Meridional Overturning Circulation (AMOC) plays an important role in modulating both the present-day climate and paleoclimate changes. Also, the Florida Current transport is highly correlated with AMOC variability on decadal and longer time scales, suggesting that observations of the Florida Current can be used to indicate AMOC variability on long time scales. On decadal and longer time scales, the coherent subtropical and subpolar AMOC is caused by the coherent buoyancy forcing in the subpolar gyre. We find that with the increase of time scales, the meridional coherence of the AMOC increases. In this study, we investigate the meridional coherence of AMOC variability and the relationship between the Florida Current variability and the AMOC variability on different time scales in a transient 20,000-year simulation. ![]() ![]() Paleoreconstructions of the Florida Current transport suggest that Florida Current variability is associated with the AMOC on the millennial time scale, but the Rapid Climate Change (RAPID) mooring array suggests a weak correlation between the Florida Current and the AMOC. The Atlantic Meridional Overturning Circulation (AMOC) variability is suggested to be incoherent between the subpolar and subtropical gyres in the Atlantic on interannual and even decadal time scales, questioning the representativeness of AMOC variability at a single latitude in modern observation and paleoreconstruction. ![]()
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