过去0.8 Ma期间的地表温度数值模拟研究

使用一个改进的二维能量平衡模式模拟了过去0.8 Ma冰期-间冰期旋回期间北半球各纬度带的地表温度,并以65°N的地表温度为代表与南极冰芯记录进行了比较.通过敏感性试验,分析了日射量、温室气体、沙尘气溶胶强迫和水汽反馈的辐射-气候效应.结果显示,日射量变化不足以解释冰期-间冰期旋回期间北半球的地表温度变化,大气温室气体(...

Simulation of Surface Temperature over the Past 0.8 Ma

The surface temperature in Northern Hemisphere over the past 0.8 Ma was simulated using an improved 2-D energy balance model, and the simulated 65°N surface temperature was compared with the Antarctic ice core record. The climatic effects of integrated insolation, greenhouse gases and dusts, and feedback process of water vapor were investigated via five sensitivity experiments, respectively. The results suggest that the insolation variability given by the Milankovitch theory can’t fully explain the surface temperature changes of the glacial-interglacial cycles in the Northern Hemisphere in the past 0.8 Ma. The influences of the radiative forcing of greenhouse gases and dust, and water vapor on the climate changes since late Pleistocene were very significant. After considering these factors, the correlation coefficient between simulated 65°N surface temperatures and Antarctic temperatures increased from 0.24 in the first test to 0.60 in the fifth one. Finally, the climate system in the model responded to the above forcings and feedbacks nonlinearly.