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dc.contributor.authorMacMartin, Douglas G.
dc.contributor.authorTziperman, Eli
dc.contributor.authorZanna, Laure
dc.date.accessioned2015-02-09T16:20:37Z
dc.date.issued2013
dc.identifier.citationMacMartin, Douglas G., Eli Tziperman, and Laure Zanna. 2013. “Frequency Domain Multimodel Analysis of the Response of Atlantic Meridional Overturning Circulation to Surface Forcing.” J. Climate 26 (21) (November): 8323–8340. doi:10.1175/jcli-d-12-00717.1.en_US
dc.identifier.issn0894-8755en_US
dc.identifier.issn1520-0442en_US
dc.identifier.urihttp://nrs.harvard.edu/urn-3:HUL.InstRepos:13954692
dc.description.abstractThe dynamics of the Atlantic meridional overturning circulation (AMOC) vary considerably among different climate models; for example, some models show clear peaks in their power spectra while others do not. To elucidate these model differences, transfer functions are used to estimate the frequency domain relationship between surface forcing fields, including sea surface temperature, salinity, and wind stress, and the resulting AMOC response. These are estimated from the outputs of the Coupled Model Intercomparison Project phase 5 (CMIP5) and phase 3 (CMIP3) control runs for eight different models, with a specific focus on Geophysical Fluid Dynamics Laboratory Climate Model, version 2.1 (GFDL CM2.1), and the Community Climate System Model, version 4 (CCSM4), which exhibit rather different spectral behavior. The transfer functions show very little agreement among models for any of the pairs of variables considered, suggesting the existence of systematic model errors and that considerable uncertainty in the simulation of AMOC in current climate models remains. However, a robust feature of the frequency domain analysis is that models with spectral peaks in their AMOC correspond to those in which AMOC variability is more strongly excited by high-latitude surface perturbations that have periods corresponding to the frequency of the spectral peaks. This explains why different models exhibit such different AMOC variability. These differences would not be evident without using a method that explicitly computes the frequency dependence rather than a priori assuming a particular functional form. Finally, transfer functions are used to evaluate two proposed physical mechanisms for model differences in AMOC variability: differences in Labrador Sea stratification and excitation by westward-propagating subsurface Rossby waves.en_US
dc.description.sponsorshipEngineering and Applied Sciencesen_US
dc.language.isoen_USen_US
dc.publisherAmerican Meteorological Societyen_US
dc.relation.isversionofdoi:10.1175/JCLI-D-12-00717.1en_US
dash.licenseLAA
dc.subjectAtlantic Oceanen_US
dc.subjectMeridional overturning circulationen_US
dc.subjectOcean dynamicsen_US
dc.subjectClimate modelsen_US
dc.titleFrequency Domain Multimodel Analysis of the Response of Atlantic Meridional Overturning Circulation to Surface Forcingen_US
dc.typeJournal Articleen_US
dc.description.versionVersion of Recorden_US
dc.relation.journalJournal of Climateen_US
dash.depositing.authorTziperman, Eli
dc.date.available2015-02-09T16:20:37Z
dc.identifier.doi10.1175/JCLI-D-12-00717.1*
workflow.legacycommentsFAR 2013en_US
dash.contributor.affiliatedTziperman, Eli


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