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首页> 外文期刊>Paleoceanography >Large sensitivity to freshwater forcing location in 8.2ka simulations
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Large sensitivity to freshwater forcing location in 8.2ka simulations

机译：在8.2ka模拟中对淡水强迫位置具有较大的敏感性

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摘要

The 8.2 ka event is a key test case for simulating the coupled climate response to changes in the Atlantic Meridional Overturning Circulation (AMOC). Recent advances in quantifying freshwater fluxes at 8.2 ka from the proxy record have improved the realism of the forcing magnitude in model simulations, yet this forcing is still generally applied in an unrealistic geographic manner, across most of the Labrador Sea rather than just along the Labrador coast. Previous simulations with eddy- resolving ocean models have come to conflicting conclusions regarding the ability of such a coastally confined flow to impact the AMOC. These simulations have also not incorporated full atmosphere models nor have they used the new meltwater forcing values for 8.2 ka. We use the Community Climate SystemModel, version 3, with an ocean model resolution only slightly coarser than that used in previous eddy-resolving simulations, to test the sensitivity to freshwater forcing location. When revised freshwater forcing is applied across the Labrador Sea, the AMOC is reduced by ~40% and climate anomalies compare well with proxy records of the 8.2 ka event in terms of magnitude and duration. When the forcing is added just along the Labrador coast, however, most meltwater joins the subtropical gyre and travels to the subtropics with minor impact to the AMOC (~10% decrease). It is likely that model biases in the placement of the North Atlantic Current remain an important limitation for correctly simulating the 8.2 ka event.
机译：8.2 ka事件是模拟气候对大西洋子午俯覆环流（AMOC）变化的耦合响应的关键测试案例。从代理记录对8.2 ka淡水通量进行量化的最新进展改善了模型模拟中强迫量的真实性，但这种强迫通常仍以不切实际的地理方式应用在整个拉布拉多海地区，而不仅仅是沿拉布拉多地区海岸。先前使用涡旋解析海洋模型进行的模拟得出了这样的结论，即这种沿海密闭流影响AMOC的能力。这些模拟也没有合并全大气层模型，也没有使用8.2 ka的新的融水强迫值。我们使用版本3的“社区气候系统模型”，其海洋模型分辨率仅比以前的涡旋解析模拟中使用的分辨率稍粗一些，以测试对淡水强迫位置的敏感性。当在拉布拉多海上应用经过修正的淡水强迫时，AMOC减少了约40％，并且气候异​​常在强度和持续时间方面与8.2 ka事件的代用记录相比非常好。但是，当仅在拉布拉多海岸沿线添加强迫时，大多数融水会加入亚热带回旋管并流向亚热带，而对AMOC的影响较小（下降约10％）。对于正确模拟8.2 ka事件，北大西洋洋流布置中的模型偏差可能仍然是一个重要限制。

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