关键词: 水球试验, 平均气候态, 经向热量输送

Abstract: The mean climate and the meridional heat transport in a fully coupled aqua-planet are studied using the Fast Ocean Atmosphere Model (FOAM). Two idealized configurations are considered: Aqua, where the whole planet is covered by the ocean; Ridge, the only difference from Aqua is a meridional barrier blocking zonal flow in the ocean. Much warmer climate relative to the real world with little sea ice is observed in both Aqua and Ridge. The meridional temperature gradient in the Northern Hemisphere (NH) is greatly reduced, which may be responsible to the decreased atmospheric heat transport in the NH. The warming results from the decrease in planetary albedo induced by the modification of the land-ocean distribution, though partly canceled by the increase in cloud amount. There is no significant difference between Aqua and Ridge in the atmosphere, except Reversed Hadley Cells in Aqua. It is found that in general the meridional heat transport and its partitioning between the atmosphere and the ocean are robust features of the climate system, even under the significant modification in the ocean as in the aqua-planet. Diffusion induced heat transport is opposite to the mean advection induced component and is of vital importance in this robustness.

Key words: aqua-planet experiment, mean climate, meridional heat transport