HR: 11:10h
AN: A22B-05    [Abstracts]
TI: Time scales and spatial patterns of passive ocean-atmosphere decay modes
AU: * Lintner, B R
EM: ben@atmos.ucla.edu
AF: UCLA, Department of Atmospheric and Oceanic Sciences 7127 Mathematical Sciences Building, Los Angeles, CA 90095-1565, United States
AU: Neelin, J D
EM: neelin@atmos.ucla.edu
AF: UCLA, Department of Atmospheric and Oceanic Sciences 7127 Mathematical Sciences Building, Los Angeles, CA 90095-1565, United States
AB: 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. Two salient features of such decay--the spatial scale dependence of sea surface temperature anomaly (SSTA) decay timescales and the spatial inhomogeneities of SSTA decay modes--are addressed using the Quasi-equilibrium Tropical Circulation (or QTCM), an intermediate level complexity model. 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 fast, essentially local, decay timescales and the slower decay at larger spatial scales; within the Tropics, efficient wave dynamics accounts 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 between local nonconvecting modes and the large-scale modes, resulting in pronounced spatial inhomogeneity in the slow decay modes.
DE: 1616 Climate variability (1635, 3305, 3309, 4215, 4513)
DE: 1620 Climate dynamics (0429, 3309)
DE: 1626 Global climate models (3337, 4928)
DE: 1635 Oceans (1616, 3305, 4215, 4513)
DE: 4504 Air/sea interactions (0312, 3339)
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting