Climate Dynamics Observational, Theoretical and Computational Research on the Climate System © Springer-Verlag Berlin Heidelberg 2013 10.1007/s00382-013-1712-1 AMO’s structure and climate footprint in observations and IPCC AR5 climate simulations Argyro Kavvada1 , Alfredo Ruiz-Barradas1 and Sumant Nigam1, 2 (1)Department of Atmospheric and Oceanic Science, University of Maryland, 3435 Computer and Space Sciences Bldg., College Park, MD 20742-2425, USA (2)Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD 20742-2425, USA Argyro Kavvada Email: argyrok@atmos.umd.edu Received: 4 June 2012 Accepted: 20 February 2013 Published online: 7 March 2013