简介: |
讲座简介:
Changes in the Atlantic Meridional Overturning Circulation (AMOC) could have a profound impact on global scale climate, as indicated by both observations and climate model simulations. This talk highlights the global and regional scale climate impacts of the AMOC on paleo and modern climate, as well as the current understanding of the linkage between AMOC variability and North Atlantic SST (NASST) variability, both from a diagnostic and mechanistic viewpoint. In particular, the multidecadal variations of NASST during the 20th century have highly debated origins, i.e. some suggested that they are primly driven by changes in aerosols. In depth analyses show that there are important discrepancies between simulated aerosol-forced response and observations, casting considerable doubt on claiming aerosols as a prime driver for the observed multidecadal variations of NASST. Independent fingerprints of AMOC variability show that the observed NASST variability is linked to AMOC variations rather than merely a 20th century artifact of changes in radiative forcing. Identifying the main drivers of the observed Atlantic Multidecadal Variability (AMV) is crucial for predicting future climate change. The talk will also discuss the meridional coherence and propagation of AMOC variations and simulated impacts of the Nordic Sea overflow (the deep branch of the AMOC).
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