Show simple item record

dc.contributor.authorZanna, Laure
dc.contributor.authorHeimbach, Patrick
dc.contributor.authorMoore, Andrew M.
dc.contributor.authorTziperman, Eli
dc.date.accessioned2011-05-31T15:57:23Z
dc.date.available2011-05-31T15:57:23Z
dc.date.issued2010-05
dc.date.submitted2009-12
dc.identifier.issn0022-3670
dc.identifier.issn1520-0485
dc.identifier.urihttp://hdl.handle.net/1721.1/63137
dc.description.abstractThe role of ocean dynamics in optimally exciting interannual variability of tropical sea surface temperature (SST) anomalies is investigated using an idealized-geometry ocean general circulation model. Initial temperature and salinity perturbations leading to an optimal growth of tropical SST anomalies, typically arising from the nonnormal dynamics, are evaluated. The structure of the optimal perturbations is characterized by relatively strong deep salinity anomalies near the western boundary generating a transient amplification of equatorial SST anomalies in less than four years. The associated growth mechanism is linked to the excitation of coastal and equatorial Kelvin waves near the western boundary following a rapid geostrophic adjustment owing to the optimal initial temperature and salinity perturbations. The results suggest that the nonnormality of the ocean dynamics may efficiently create large tropical SST variability on interannual time scales in the Atlantic without the participation of air–sea processes or the meridional overturning circulation. An optimal deep initial salinity perturbation of 0.1 ppt located near the western boundary can result in a tropical SST anomaly of approximately 0.45°C after nearly four years, assuming the dynamics are linear. Possible mechanisms for exciting such deep perturbations are discussed. While this study is motivated by tropical Atlantic SST variability, its relevance to other basins is not excluded. The optimal initial conditions leading to the tropical SST anomalies’ growth are obtained by solving a generalized eigenvalue problem. The evaluation of the optimals is achieved by using the Massachusetts Institute of Technology general circulation model (MITgcm) tangent linear and adjoint models as well the the Arnoldi Package (ARPACK) software for solving large-scale eigenvalue problems.en_US
dc.language.isoen_US
dc.publisherAmerican Meteorological Societyen_US
dc.relation.isversionofhttp://dx.doi.org/10.1175/2009jpo4196.1en_US
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.en_US
dc.sourceAmerican Meteorological Societyen_US
dc.titleThe Role of Ocean Dynamics in the Optimal Growth of Tropical SST Anomaliesen_US
dc.typeArticleen_US
dc.identifier.citationZanna, Laure, Patrick Heimbach, Andrew M. Moore, and Eli Tziperman. "The Role of Ocean Dynamics in the Optimal Growth of Tropical SST Anomalies." J. Phys. Oceanogr., 40.5, 983–1003. 2010. © 2010 American Meteorological Society.en_US
dc.contributor.departmentMassachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciencesen_US
dc.contributor.approverHeimbach, Patrick
dc.contributor.mitauthorHeimbach, Patrick
dc.relation.journalJournal of Physical Oceanographyen_US
dc.eprint.versionFinal published versionen_US
dc.type.urihttp://purl.org/eprint/type/JournalArticleen_US
eprint.statushttp://purl.org/eprint/status/PeerRevieweden_US
dspace.orderedauthorsZanna, Laure; Heimbach, Patrick; Moore, Andrew M.; Tziperman, Elien
dc.identifier.orcidhttps://orcid.org/0000-0003-3925-6161
mit.licensePUBLISHER_POLICYen_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record