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Linear and nonlinear responses to middle latitude surface temperature anomaliesNonlinear responses to fixed and seasonally varying surface temperature anomalies in a two-level hemispheric time-dependent coupled atmosphere-surface mixed layer model are described. Linear stationary models that are equivalent to the nonlinear time-dependent model are used to analyze these responses. A model linearized around the climatological zonal state of the time dependent model and forced by anomalous surface temperatures does not provide a reasonable estimate for the anomalous reponses, which are considerably underestimated. Better responses are obtained when the anomalous stationary nonlinear eddy fluxes are included in a model linearized around the full climatology. However, this latter model is overly sensitive, and anomalous responses are a small residual balance to the forcing by the surface temperature anomalies and the anomalous transient eddy fluxes. To better understand these linear responses, an eigenanalysis of the climatological state is performed. Seasonal anomalies appear to be dominated by one characteristic pattern near resonance which can be associated with a slowly growing coupled atmosphere-ocean instability.
Document ID
19890066409
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Roads, John O.
(California, University La Jolla, United States)
Date Acquired
August 14, 2013
Publication Date
September 1, 1989
Publication Information
Publication: Journal of Climate
Volume: 2
ISSN: 0894-8755
Subject Category
Meteorology And Climatology
Accession Number
89A53780
Funding Number(s)
CONTRACT_GRANT: NAG2-36
CONTRACT_GRANT: NSF ATM-85-20540
CONTRACT_GRANT: NOAA-NA-86AADCP104
Distribution Limits
Public
Copyright
Other

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