Modeling the Miocene Climatic Optimum. Part I: Land and Atmosphere
Modeling the Miocene Climatic Optimum. Part I: Land and Atmosphere
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DOI：
10.1175/2011jcli4035.1
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发表时间：
2011-12-15
影响因子：
4.9
通讯作者：
Mueller, R. D.
中科院分区：
文献类型：
--
作者：
Herold, N.;Huber, M.;Mueller, R. D.
本研究介绍了社区气候系统模型3（CCSM 3）的结果，迫使早中新世中期（类似于20-14马）植被，地形，水深，和现代二氧化碳。与用现代边界条件强迫的控制模拟相比，模拟了6.5 ℃的赤道温度梯度的降低和1.5 ℃的全球平均温度的增加。季节性极向位移的副热带急流和风暴路径相比，控制模拟与哈德利环流和显着冷却极地平流层的变化，与以前预测的全球变暖的影响相一致。能量收支的计算表明，减少CO2和地形负责中新世温暖的高纬度北方半球，而海洋热传输的增加和减少CO2的组合负责相对温暖的高纬度南半球，与现在相比。模型数据分析表明，中新世的气候明显比这里模拟的温暖和潮湿，与以前的非耦合中新世模型一致，并支持最近重建的中新世CO2大大高于现在。
This study presents results from the Community Climate System Model 3 (CCSM3) forced with early to middle Miocene (similar to 20-14 Ma) vegetation, topography, bathymetry, and modern CO2. A decrease in the meridional temperature gradient of 6.5 degrees C and an increase in global mean temperature of 1.5 degrees C are modeled in comparison with a control simulation forced with modern boundary conditions. Seasonal poleward displacements of the subtropical jet streams and storm tracks compared to the control simulation are associated with changes in Hadley circulation and significant cooling of the polar stratosphere, consistent with previously predicted effects of global warming. Energy budget calculations indicate that reduced albedo and topography were responsible for Miocene warmth in the high-latitude Northern Hemisphere while a combination of increased ocean heat transport and reduced albedo was responsible for relative warmth in the high-latitude Southern Hemisphere, compared to the present. Model-data analysis suggests Miocene climate was significantly warmer and wetter than simulated here, consistent with previous uncoupled Miocene models and supports recent reconstructions of Miocene CO2 substantially higher than present.