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Oceanic processes as potential trigger and amplifying mechanisms for Heinrich events

机译：海洋过程是海因里希事件的潜在触发和放大机制

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摘要

Marine sediments recorded a series of Heinrich events during the last glacial period, massive ice surges that deposited prominent layers of ice-rafted debris in the North Atlantic. Here we explore oceanic mechanisms that can potentially trigger and amplify the observed ice calving events. Simulations of abrupt glacial climate change with a coupled ocean-atmosphere- sea ice model show a substantial regional sea level rise in the North Atlantic in response to a collapse of the Atlantic meridional overturning circulation (MOC). The increased heat uptake of the global ocean after the MOC collapse leads to an additional rise in global sea level. We hypothesize that these sea level changes have the potential to destabilize Northern Hemisphere ice shelves and ice sheets and to trigger ice surges. Sea level rise due to ice calving and subsurface ocean warming provides two positive feedback mechanisms contributing to further destabilization of ice shelves and ice sheets.
机译：海洋沉积物记录了在上一个冰川期发生的一系列海因里希事件，大量的冰涌使北大西洋的浮冰残骸沉积了明显的层。在这里，我们探讨了可能触发和放大观测到的产冰事件的海洋机制。利用耦合的海洋-大气-海冰模型对冰川的突然气候变化进行的模拟显示，北大西洋响应大西洋经向翻转环流（MOC）的崩溃，导致区域性海平面大幅上升。 MOC崩溃后，全球海洋吸收的热量增加，导致全球海平面进一步上升。我们假设这些海平面变化有可能破坏北半球冰架和冰盖的稳定性，并引发冰激增。由于产冰和地下海洋变暖引起的海平面上升提供了两个积极的反馈机制，这进一步加剧了冰架和冰盖的不稳定。

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