SIMULATING QUATERNARY PALEOCLIMATE WITH THE LLN 2─D MODEL
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摘要: 本文着重介绍LLN模式对中晚第四纪大陆冰量变迁的模拟研究。由于天文学研究已经推算出大气层顶部太阳辐射过去和将来的长期变化，因而对本文的LLN二维模式而言，能否有效地进行古气候模拟在很大程度上取决于对古CO2浓度的重建。随着对第四纪CO2历史研究的不断深入，LLN模式对古气候长期变迁的模拟已从最初的末次冰期－间冰期延伸到0.6Ma B.P..。模拟的大陆冰量变化与地质记录对比良好，二者在与地球轨道要素有关的天文频率上的波动具有很高的相关性。Abstract: To test the Milankovitch climate theory, a two dimensional climate model was designed at Louvain-la-Neuve[11]. It is a latitude-altitude model.In each latitudinal belt (5 degrees), the surface is divided into 5 oceanic or continental surfaCe types (oceanic surfaces free of ice or covered by ice, continental surfaces with or without snow cover, and ice sheet). The atmospheric dynandcs is represented by a zonally averaged quasi-geostrophic model; The atmosphere interacts with the other components of the climate system through vertical fluxes of momentums, heat and water vapor.The model explicitly incorporates detailed radiative transfer, surface energy balances, and snow and sea-ice budgets.
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