Investigation of Biogeophysical Feedback on the African Climate Using a Two-Dimensional Model
Investigation of Biogeophysical Feedback on the African Climate Using a Two-Dimensional Model
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使用二维模型研究非洲气候的生物地球物理反馈
DOI：
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发表时间：
1990
期刊：
影响因子：
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通讯作者：
A. Kasahara
中科院分区：
文献类型：
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作者：
Y. Xue;K. Liou;A. Kasahara
摘要为了研究非洲气候的地球物理反馈，建立了一个二维纬向平均的时变气候模式。一个数值方案已被专门设计的模式，以确保质量，动量，能量和水蒸气的守恒。在6月15日至7月30日进行了太阳天顶角变化的控制实验。模拟结果使用过去30天的平均值呈现。模拟的温度，湿度和风7月平均条件比较合理，以及与纬向平均，观测值。植被层已被纳入目前的2-D气候模式。使用耦合的气候-植被模型，我们进行了两个测试，涉及撒哈拉沙漠的移除和扩展。结果表明，地表条件的变化对气候系统产生了显著的反馈。从陆地表面到大气的反馈不仅影响降水和云量，而且还...
Abstract A 2-D zonally averaged, time-dependent climate model has been developed to study the biogeophysical feedback for the climate of Africa. A numerical scheme has been specifically designed for the model to ensure the conservation of mass, momentum, energy, and water vapor. A control experiment has been carried out in which the solar zenith angle was varied from 15 June to 30 July. The simulated results are presented using averages over the last 30 days. The simulated temperature, humidity, and winds for July mean conditions compare reasonably, well with zonally averaged, observed values. A vegetation layer has been incorporated in the present 2-D climate model. Using the coupled climate-vegetation model, we performed two tests involving the removal and expansion of the Sahara Desert. Results show that variations in the surface conditions produce a significant feedback to the climate system. The feedback from the land surface to the atmosphere affects not only precipitation and cloud cover, but also ...