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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、冰流变化和下垫面植被变化的影响
In this paper, we simulate the climate of 2 1ka BP driven by the 9-layer atmospheric circulation spectrum model (AGCM + SSi B) with land surface processes driven by the orbital parameters and underlying surface boundary conditions. The results show that at 21 ka BP The drought in eastern China, humid in the west and the Qinghai-Tibet Plateau, and the general cooling down in the whole country.The results of the simulation basically capture the climatic characteristics reconstructed from ancient lake and sporopollen. The analysis of the atmospheric circulation field and the precipitation field revealed by model 2 1ka BP East Asian summer monsoon circulation weakened significantly, while the Qinghai-Tibet Plateau summer monsoon circulation increased; winter monsoon circulation slightly enhanced now. The significance of the simulation results: (1) the first with the physical mechanism of the numerical model to reproduce the last ice age The climate condition in China is basically consistent with the geological data. (2) The reasons for the huge difference between climate and modern climate in 21 ka BP are explained by the dynamical mechanism due to the influence of radiation change, ice flow change and underlying vegetation change