reference : The Atlantic Multidecadal Oscillation without a role for ocean circulation

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Bibliographic fields
reftype Journal Article
Abstract What causes the pattern of sea surface temperature change that is seen in the North Atlantic Ocean? This naturally occurring quasi-cyclical variation, known as the Atlantic Multidecadal Oscillation (AMO), affects weather and climate. Some have suggested that the AMO is a consequence of variable large-scale ocean circulation. Clement et al. suggest otherwise. They find that the pattern of AMO variability can be produced in a model that does not include ocean circulation changes, but only the effects of changes in air temperatures and winds.Science, this issue p. 320The Atlantic Multidecadal Oscillation (AMO) is a major mode of climate variability with important societal impacts. Most previous explanations identify the driver of the AMO as the ocean circulation, specifically the Atlantic Meridional Overturning Circulation (AMOC). Here we show that the main features of the observed AMO are reproduced in models where the ocean heat transport is prescribed and thus cannot be the driver. Allowing the ocean circulation to interact with the atmosphere does not significantly alter the characteristics of the AMO in the current generation of climate models. These results suggest that the AMO is the response to stochastic forcing from the mid-latitude atmospheric circulation, with thermal coupling playing a role in the tropics. In this view, the AMOC and other ocean circulation changes would be largely a response to, not a cause of, the AMO.
Author Clement, Amy; Bellomo, Katinka; Murphy, Lisa N.; Cane, Mark A.; Mauritsen, Thorsten; Rädel, Gaby; Stevens, Bjorn
DOI 10.1126/science.aab3980
Issue 6258
Journal Science
Pages 320-324
Title The Atlantic Multidecadal Oscillation without a role for ocean circulation
Volume 350
Year 2015
Bibliographic identifiers
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_record_number 20870
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