Simulations of two Last Glacial Maximum ocean states
Simulations of two Last Glacial Maximum ocean states
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两次末次盛冰期海洋状态的模拟
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
J. Johnson
中科院分区：
文献类型：
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作者：
G. Bigg;M. Wadley;D. Stevens;J. Johnson
在对最后一次冰川最大(LGM)海洋的模拟中，产生了两个稳定的温盐环流状态，两者都是由相同的规定大气强迫的。这种大气的直接应用导致了具有强大的北大西洋深水形成(北部下沉状态(NSS))的平衡状态。在北大西洋短期施加弱淡水通量异常后，进入一个北大西洋很少，但南大洋显著的深水形成(南部下沉状态(SSS))的状态。建立了一个完全动力学和热力学的冰山轨迹模型，并在两种状态下都加入了冰山。发现了明显不同的路径，特别是在大西洋东部，SSS冰山倾向于沿着欧洲海岸向南移动，而在NSS向北移动。虽然这两个海洋状态都不是LGM海洋的最终模型，但古气候数据更符合NSS的特征。
Two stable thermohaline circulation states were produced in simulations of the last glacial maximum (LGM) ocean, both forced by the same prescribed atmosphere. Direct application of this atmosphere led to an equilibrium state with strong North Atlantic Deep Water formation (northern sinking state (NSS)). Upon applying a weak freshwater flux anomaly to the North Atlantic for a short time a state was entered with little North Atlantic, but significant Southern Ocean, Deep Water formation (southern sinking state (SSS)). A fully dynamic and thermodynamic iceberg trajectory model was developed, and icebergs were seeded into both states. Distinctly different pathways were found, particularly in the eastern Atlantic where the SSS icebergs tend to move south along the European coast while they move north in the NSS. While neither ocean state is claimed to be a definitive model for the LGM ocean, paleoclimate data are more consistent with the characteristics of the NSS.