Ocean-atmosphere interactions and climate drift in a coupled general circulation model
Ocean-atmosphere interactions and climate drift in a coupled general circulation model
复制标题
耦合大气环流模型中的海洋-大气相互作用和气候漂移
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
T. Fichefet
中科院分区：
文献类型：
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作者：
H. Grenier;H. Treut;T. Fichefet
摘要：我们分析了使用全球 3D 耦合大气-海洋模型进行的数值模拟，重点关注大气过程导致热带海面温度 (SST) 漂移的作用。根据强制海表温度模拟诊断，负海表温度误差在空间和时间上一致出现，热带海气界面的潜热和动量通量存在较大的正误差。经过几年的模拟，西太平洋的暖池消失了。强烈的海温梯度导致赤道以北地区降水量稀薄且静止。我们详细介绍了深对流位置的这种剧变对海洋大气系统的影响。一项经验性地制定海气阻力系数的敏感性实验表明，暖池的快速侵蚀对海洋表面阻力系数的制定变化并不敏感，因为湍流热通量和LW冷却的相应变化几乎相互抵消。在东太平洋，海温的改善是惊人的，这是由海温、表面湍流通量和边界层云分数之间的反馈引起的，随着海温变暖，边界层云分数减少。
Abstract We have analysed numerical simulations performed with a global 3D coupled atmosphere-ocean model to focus on the role of atmospheric processes leading to sea surface temperature (SST) drift in the tropics. Negative SST errors occur coherently in space and time with large positive errors in latent heat and momentum fluxes at the tropical air-sea interface, as diagnosed from forced SST simulations. The warm pool in the western Pacific disappears after a few years of simulation. Strong SST gradients enforce regions of high precipitation that are thin and stationary north of the equator. We detail the implications for the ocean-atmosphere system of such upheaval in the deep convection location. A sensitivity experiment to empirically formulate air-sea drag coefficient shows that the rapid warm pool erosion is not sensitive to changes in the formulation of the surface drag coefficient over the oceans because the corresponding changes in turbulent heat fluxes and LW cooling approximately cancel one another. In the eastern Pacific, the improvement in SST is striking and caused by feedbacks between SST, surface turbulent fluxes and boundary layer cloud fraction, which decreases as SST warms.