摘要
本文使用含有陆面过程的 9层大气环流谱模式 (AGCM+SSi B) ,在地球轨道参数和下垫面边界条件驱动下 ,对 2 1ka BP的气候进行模拟试验 .结果表明 ,2 1ka BP时中国东部干旱 ,西部和青藏高原湿润 ,全国普遍降温 .该模拟结果基本捕捉了由古湖泊资料和孢粉资料重建的气候特征 .对模式输出的大气环流场和降水场的分析揭示出 ,2 1ka BP东亚夏季风环流明显减弱 ,而青高原夏季风环流增强 ;冬季风环流较现在略有增强 .该模拟结果的意义在于 :(1)率先用具有物理机制的数值化模型再现了末次盛冰期中国的气候状况 ,结果与地质资料基本一致 ;(2 )从动力机制的角度解释了 2 1ka BP气候与现代气候存在巨大差别的原因在于辐射变化。
In this paper, we report a simulation of climate at 21kaBP using AGCM+SSiB with forcing boundary conditions and orbital forcing insolation anomalies. The results show that there were significant decreases in temperature in large scale. The climate at 21kaBP was cold and dry in eastern China and cold and wet in Tibetan Plateau. This simulation catches the basic climate features reconstructed from palaeo lake data and pollen data, and predicts the climate of China at 21ka B.P. The atmospheric circulation and precipitation by model experiments reveal that summer monsoon circulation at 21kaBP in eastern Asia was weakened significantly but the Tibetan Plateau summer circulation system was strengthen. The winter monsoon at 21kaBP was little stronger than today. The simulation is able to sever: (1) It is first time to use a AGCM with physical processes and mechanism to simulate last maximum glacial climate in China and that is consistent with geological evidence basically. (2) The cause of climate significant changes between 21kaBP and present could be understood in dynamical mechanisms, such as changes of solar radiation, ice sheet, surface conditions and feedback interactions among these factors.
出处
《湖泊科学》
EI
CAS
CSCD
2000年第2期154-164,共11页
Journal of Lake Sciences
基金
中国科学院 1 998年"百人计划"(南京地理与湖泊研究所"古湖泊与古气候模拟"课题 )资助
