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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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Thomas Jung and Peter B. Rhines

existence of these cyclones may have profound implications for air–sea interaction and sea ice drift in the Labrador Sea. They suffer in comparison with the dominant storm-track cyclones east of Greenland, from the loss of the warm ocean surface found southeast of Greenland. Frequent northerly winds from the Arctic, ducted through Nares Strait, also inhibit the northward movement of cyclones in this region. Surprisingly, the cyclone track along the western side of Greenland is absent in the T95L60 model

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I. G. Watterson

Model (MOM) code. It has two grid boxes for each atmospheric grid square (from halved latitude spacing), and 31 levels, with the upper three layer thicknesses being 10, 12, and 14 m. A now-standard set of physical processes are modeled, including the land surface, dynamical sea ice, cloud formation, precipitation, convection, and radiation. The radiation in the model is perturbed through variations in the specified ozone distribution and greenhouse gas (GHG) concentration. Some effects of

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Edwin P. Gerber and Geoffrey K. Vallis

1. Introduction In this paper we investigate processes that determine the persistence of the zonal index and North Atlantic Oscillation (NAO), focusing on intraseasonal time scales. By intraseasonal, we mean time scales of 10–100 days, longer than those associated with synoptic variability, but not so long as to allow for significant changes in the boundary conditions or forcing, such as sea surface temperature. On these shorter periods, then, the focus is on internal processes in the

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