Time scales and spatial patterns of passive ocean-atmosphere decay modes

The decay characteristics of a mixed layer ocean passively coupled to an atmospheric model are important to the response of the climate system to stochastic or external forcing. We address here two salient features of such decay: the scale dependence of sea surface temperature anomaly (SSTA) decay timescales and the spatial inhomogeneities of SSTA decay modes. As expected, decay timescales increase with the spatial extent of the SSTA. Most modes decay rapidly–with characteristic decay times of 50-100 days for a 50 m mixed layer–with the decay determined by local surface flux adjustment. Only those modes with spatial scales approaching or larger than the tropical basin scale exhibit decay timescales distinctively longer than the local decay, with the decay timescale of the most slowly decaying mode of order 250-300 days in the tropics (500 days globally). Simple analytic prototypes of the spatial scale dependence and the effect of basic state inhomogeneities, especially the impact of nonconvecting regions, elucidate these results. Horizontal energy transport sets the transition between the fast, essentially local, decay timescales and the slower decay at larger spatial scales; within the Tropics, efficient wave dynamics account for the small number of slowly-decaying modes. Inhomogeneities in the basic state climate, such as the presence or absence of mean tropical deep convection, strongly impact large-scale SSTA decay characteristics. For nonconvecting regions, SSTA decay is slow because evaporation is limited by relatively slow moisture divergence. The separation of convecting and nonconvecting region decay times and the closeness of the slower nonconvecting region decay timescale to the most slowly-decaying modes cause a blending of properties between local nonconvecting modes and the large-scale modes, resulting in strong spatial inhomogeneity in the slow decay modes. JOURNAL OF CLIMATE (submitted) 1