A highly nonlinear coupled mode of decadal variability in a mid-latitude ocean atmosphere model

Details A highly nonlinear coupled mode of decadal variability in a mid-latitude ocean atmosphere model A highly nonlinear coupled mode of decadal variability in a mid-latitude ocean atmosphere model

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dyato..43..123k&link_type=abstract

Dynamics of Atmospheres and Oceans, Volume 43, Issue 3-4, p. 123-150.

Computer Science

7

Scientific paper

This study examines mid-latitude climate variability in a model that couples turbulent oceanic and atmospheric flows through an active oceanic mixed layer. Intrinsic ocean dynamics of the inertial recirculation regions combines with nonlinear atmospheric sensitivity to sea-surface temperature (SST) anomalies to play a dominant role in the variability of the coupled system. Intrinsic low-frequency variability arises in the model atmosphere; when run in a stand-alone mode, it is characterized by irregular transitions between preferred high-latitude and less frequent low-latitude zonal-flow states. When the atmosphere is coupled to the ocean, the low-latitude state occurrences exhibit a statistically significant signal in a broad 5 15-year band. A similar signal is found in the time series of the model ocean's energy in this coupled simulation. Accompanying uncoupled ocean-only and atmosphere-only integrations are characterized by a decrease in the decadal-band variability, relative to the coupled integration; their spectra are indistinguishable from a red spectrum. The time scale of the coupled interdecadal oscillation is set by the nonlinear adjustment of the ocean's inertial recirculations to the high-latitude and low-latitude atmospheric forcing regimes. This adjustment involves, in turn, SST changes resulting in long-term ocean atmosphere heat-flux anomalies that induce the atmospheric regime transitions.

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