Last Glacial Maximum ocean thermohaline circulation: PMIP2 model intercomparisons and data constraints
Last Glacial Maximum ocean thermohaline circulation: PMIP2 model intercomparisons and data constraints
复制标题
DOI：
10.1029/2007gl029475
复制
发表时间：
2007-06
影响因子：
5.2
通讯作者：
B. Otto‐Bliesner;C. D. Hewitt;T. Marchitto;E. Brady;A. Abe‐Ouchi;M. Crucifix;S. Murakami;S. Weber
中科院分区：
文献类型：
--
作者：
B. Otto‐Bliesner;C. D. Hewitt;T. Marchitto;E. Brady;A. Abe‐Ouchi;M. Crucifix;S. Murakami;S. Weber
海洋温盐环流对热量输送和碳循环具有重要意义。我们介绍了PMIP 2耦合大气-海洋模拟的结果，其中四个气候模型也用于未来的评估。这些模型给出了非常不同的冰川温盐环流，即使目前的环流具有可比性。一个综合的方法，使用这些模拟结果的末次冰期最大（LGM）与代理的冰川表面和深大西洋的状态支持营养示踪剂的解释，北大西洋深水和南极底层水之间的边界在此期间要浅得多。关于末次盛冰期北大西洋翻转环流的强度，这种综合重建的限制较少，尽管它们共同表明它既不明显强于现代也不明显弱于现代。两个模型模拟确定了两个半球的海冰在驱动海洋对冰川强迫的反应中的作用。
The ocean thermohaline circulation is important for transports of heat and the carbon cycle. We present results from PMIP2 coupled atmosphere‐ocean simulations with four climate models that are also being used for future assessments. These models give very different glacial thermohaline circulations even with comparable circulations for present. An integrated approach using results from these simulations for Last Glacial Maximum (LGM) with proxies of the state of the glacial surface and deep Atlantic supports the interpretation from nutrient tracers that the boundary between North Atlantic Deep Water and Antarctic Bottom Water was much shallower during this period. There is less constraint from this integrated reconstruction regarding the strength of the LGM North Atlantic overturning circulation, although together they suggest that it was neither appreciably stronger nor weaker than modern. Two model simulations identify a role for sea ice in both hemispheres in driving the ocean response to glacial forcing.