Heat transport, deep waters, and thermal gradients: Coupled simulation of an Eocene Greenhouse Climate
Heat transport, deep waters, and thermal gradients: Coupled simulation of an Eocene Greenhouse Climate
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DOI：
10.1029/2001gl012943
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发表时间：
2001-09-15
影响因子：
5.2
通讯作者：
Sloan, LC
中科院分区：
文献类型：
--
作者：
Huber, M;Sloan, LC
第一次，耦合大气环流模式与互动和动态的大气，海洋和海冰组件，是用来模拟始新世（类似于50马）的“温室”气候。我们介绍了有效的海洋自旋耦合古气候建模方法。海洋表面温度（SST）和盐度的演变不受约束，产生这些始新世气候参数的第一个代理数据独立的估计。热带和温带模式预测的SST分别比现代值高3和5摄氏度。盐度驱动的深水形成发生在北大西洋和特提斯。纬向平均翻转环流弱于现代。始新世海洋热输送在北方半球比现代少0.6 PW，在南半球比现代多0.4 PW。模型预测的近现代垂直和纬向始新世温度梯度意味着，占主导地位的理论，保持低梯度增加海洋热传输是不正确的或不完整的，其他机制应加以探讨。
For the first time, a coupled general circulation model with interactive and dynamical atmospheric, oceanic, and sea-ice components, is used to simulate an Eocene (similar to 50 Ma) "greenhouse" climate. We introduce efficient ocean spin-up methods for coupled paleoclimate modeling. Sea surface temperatures (SSTs) and salinities evolve unconstrained, producing the first proxy data-independent estimates for these Eocene climate parameters. Tropical and extratropical model-predicted SSTs are warmer than modern values, by 3 and 5 degreesC, respectively. Salinity-driven deep water formation occurs in the North Atlantic and Tethys. The zonal average overturning circulation is weaker than modern. Eocene ocean heat transport is 0.6 PW less than modern in the Northern Hemisphere and 0.4 PW greater in the Southern Hemisphere. The model-predicted near-modern vertical and meridional Eocene temperature gradients imply that the dominant theory for maintaining low gradients-increased ocean heat transport-is incorrect or incomplete and other mechanisms should be explored.