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Edwin P. Gerber and Geoffrey K. Vallis

momentum fluxes. The potential for low frequency anomalies, which are largely barotropic, to in turn influence the baroclinic eddies, thereby completing a feedback loop, has been harder to establish. Branstator (1995) used a linear model to predict the synoptic response to the intraseasonal anomalies. The resulting change in the storm track was such as to reinforce the anomaly. Robinson (2006) argues that the eddies increase the baroclinicity in the jet core relative to the flanks, so helping to

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John Marshall, David Ferreira, J-M. Campin, and Daniel Enderton

radiation. Furthermore, if conditions permit, ice can form. Before going on, it should be mentioned that to atmospheric modelers, more often than not, “aquaplanet” is taken to imply an atmosphere coupled to a slab ocean or even a prescribed sea surface temperature (SST) distribution, in the absence of land. For example, Hess (1993) uses an aquaplanet configuration with prescribed SSTs to investigate the sensitivity of the intertropical convergence zone (ITCZ) to various latitudinal distributions of

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I. G. Watterson

latitudes. In monthly means, the correlations between the indices and zonal mean precipitation exceed 0.7 for HLM, and 0.6 for LLM. Correlations at grid squares can also be significant, including at some locations in South America and Australia. Surface temperature, of both land and ocean, is also affected. The model results for HLM compare very well with the relationships between station data and SAM presented by Gillett et al. (2006) . This supports the use of the HLM, at least, in interpreting

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