Transient Climate Change in the CSIRO Coupled Model with Dynamic Sea Ice

作者：Hal B. Gordon, Siobhan P. O’Farrell · 发表于：Monthly Weather Review · 年份：1997 · DOI：10.1175/1520-0493(1997)125<0875:tccitc>2.0.co;2 · 被引用次数：368 · 研究领域：Arctic and Antarctic ice dynamics、Climate variability and models、Oceanographic and Atmospheric Processes

The CSIRO coupled model has been used in a "transient" greenhouse experiment. This model contains atmospheric, oceanic, comprehensive sea-ice (dynamic/thermodynamic plus leads), and biospheric submodels. The model control run (over 100 years long) employed flux corrections and displayed only a small amount of cooling, mainly at high latitudes. The transient experiment (1% increase in CO2 compounding per annum) gave a 2°C warming at time of CO2 doubling. The model displayed a "cold start" effect with a (maximum) value estimated at 0.3°C. The warming in the transient run had an asymmetrical response as seen in other coupled models, with the Northern Hemisphere (NH) warming more than the Southern Hemisphere (SH). However, the land surface response in this model is different from some other transient experiments in that there is not a pronounced drying of the midlatitudes in the NH in summer. In the control run the ice model gave realistic ice distributions at both poles, with the NH ice in particular displaying considerable interdecadal variability. In the transient run the ice amount decreased more in the NH than the SH (corresponding with a greater NH warming). The NH ice extent and volume in summer was considerably reduced in depth and extent compared to the control. However, the model ice dynamics and thermodynamics allowed for a successful regrowth of the ice during the winter season to give a coverage comparable to that of the control run, although thinner. During the tran...