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Climate impacts of the Atlantic Multidecadal Oscillation simulated in the CMIP5 models: A re‐evaluation based on a revised index
Author(s) -
Lyu Kewei,
Yu JinYi
Publication year - 2017
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2017gl072681
Subject(s) - atlantic multidecadal oscillation , coupled model intercomparison project , climatology , environmental science , precipitation , sea surface temperature , climate model , north atlantic oscillation , atlantic hurricane , surface air temperature , climate change , oceanography , geology , meteorology , geography , tropical cyclone
The Atlantic Multidecadal Oscillation (AMO) has pronounced influences on weather and climate across the globe. This study provides a direct comparison of the observed AMO‐related surface temperature and precipitation anomalies to those simulated in the Coupled Model Intercomparison Project Phase 5 (CMIP5) models. It is found that the model‐simulated AMO‐related features are obscured by the global signal in some key regions if the North Atlantic sea surface temperature (SST) itself is used to represent the AMO as in previous studies. After the global mean SST is removed from the North Atlantic SST, the CMIP5 models show substantially better agreement with the observations in terms of the AMO‐related worldwide impacts, such as the Pacific SST and the rainfall over the United States and India. These results suggest the removal of the global signal or signals originating in other ocean basins is a necessary procedure to uncover the AMO features in climate model simulations.