Atlantic thermohaline circulation and its response to increasing CO2 in a coupled atmosphere‐ocean model
Atlantic thermohaline circulation and its response to increasing CO2 in a coupled atmosphere‐ocean model
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大气-海洋耦合模型中大西洋温盐环流及其对二氧化碳增加的响应
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
R. Bleck
中科院分区：
文献类型：
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作者：
Shan Sun;R. Bleck
本文利用一个海洋-大气耦合环流模式(AOGCM)讨论了大西洋温盐环流(THC)及其对温室气体浓度增加的响应。进行了两个200年的模式积分--一个是假设大气成分固定的控制运行，另一个是假设二氧化碳逐渐加倍的扰动运行。我们没有在海-气界面使用通量校正，也没有在耦合之前使海洋自转。控制运行中的表面条件在几十年后稳定下来。当二氧化碳以每年1%的速度增加一倍时，该模式的响应是200年后全球平均地表气温(SAT)增加2℃，大西洋经向翻转环流几乎没有变化。后者是通过盐度的增加来维持的，这抵消了全球变暖对表面浮力的影响。
We discuss aspects of the Atlantic thermohaline circulation (THC) and its response to increased greenhouse gas concentration, using a coupled atmosphere‐ocean general circulation model (AOGCM) whose oceanic component is a new hybrid‐isopycnal model. Two 200‐year model integrations are carried out—a control run assuming fixed atmospheric composition and a perturbation run assuming gradual doubling of CO2. We employ no flux corrections at the air‐sea interface, nor do we spin up the ocean prior to coupling. The surface conditions in the control run stabilize after several decades. When doubling CO2 at the rate of 1% per year, the model responds with a 2°C increase in global mean surface air temperature (SAT) after 200 years and a virtually unchanged Atlantic meridional overturning circulation. The latter is maintained by a salinity increase that counteracts the effect of global warming on the surface buoyancy.