The ocean floor sedimentological signature of Heinrich event 3 (H3) is markedly different from that of other Heinrich events that are known to have originated in Hudson Strait. It has therefore been suggested that the H3 contribution to iceberg flux may have been delivered by ice streams located in the eastern sector of the North Atlantic, from the Fennoscandian or British Isles ice sheets. To investigate this possibility and whether the instability involved may have been tidally induced, as seems to have been the case for H1, we consider several eastern Atlantic sector possibilities: a hypothetical Barents Sea ice stream, the Norwegian ice stream, and the Irish Sea ice stream. We find that the extremely high amplitude of the M2 tidal constituent in the western North Atlantic that appears to have forced H1 did not exist in the northeastern Atlantic. This suggests that, with one possible exception, if destabilized ice streams in this region did contribute to H3, tidal forcing was most probably not the cause. The single exception to this general conclusion may be the Irish Sea ice stream, and we comment on the probability of a contribution to H3 from this source.

中文翻译：

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对海因里希事件 3 的非劳伦泰德冰流贡献的可能性的调查

海因里希事件 3 (H3) 的海底沉积学特征明显不同于已知起源于哈德逊海峡的其他海因里希事件。因此有人提出，H3 对冰山通量的贡献可能来自位于北大西洋东部的冰流，来自 Fennoscandian 或不列颠群岛的冰盖。为了研究这种可能性以及所涉及的不稳定性是否可能是潮汐引起的，就像 H1 的情况一样，我们考虑了几个东大西洋扇区的可能性：假设的巴伦支海冰流、挪威冰流和爱尔兰海冰溪流。我们发现北大西洋西部的 M2 潮汐成分的极高振幅似乎迫使 H1 在大西洋东北部不存在。这表明，除了一个可能的例外，如果该地区不稳定的冰流确实促成了 H3，那么潮汐强迫很可能不是原因。这个一般结论的唯一例外可能是爱尔兰海冰流，我们评论了这个来源对 H3 贡献的可能性。