The long-term evolution of deep-sea turbidity current activity is closely related to climate and sea level changes; however, the impact of abrupt climate change (e.g. millennial-scale events in high northern latitudes) is poorly known. In this paper, deep-sea turbidite records in the western part of the lower Bengal Fan were identified since the Last Glacial Maximum (LGM) to investigate the effects of abrupt climate change on the development of the Earth's largest deep-sea fan. Our records show a termination of turbidite activity in the western lower fan at 16.6 ka–15.4 ka almost contemporaneous with Heinrich 1 event (a cooling stadial in high northern latitudes). The trigger of this termination in turbidite activity may have been a sharp decrease in erosion rates during a time of relatively stable sea level and rapid source-sink processes. The subsequent episodes of the Bolling/Allerod warm interstadial and Younger Dryas cold stadial and the rapid sea level rise event that followed possibly induced adjustment of turbidity current activities in the Bengal Fan, as indicated by other published records. In summary, we show that close links exist between abrupt climate changes in the high-latitude Northern Hemisphere and deep-sea turbidity current activity in the low-latitude South Asia.

中文翻译：

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末次盛冰期以来孟加拉扇深海浊流活动记录

深海浊流活动的长期演变与气候和海平面变化密切相关；然而，气候突变（例如北高纬度地区发生的千禧年规模事件）的影响却鲜为人知。本文确定了自末次盛冰期（LGM）以来孟加拉扇下部西部的深海浊积岩记录，以研究气候突变对地球最大深海扇发展的影响。我们的记录显示，西部低扇区浊积岩活动在 16.6 ka–15.4 ka 几乎与 Heinrich 1 事件（北高纬度地区的冷却场）同时终止。浊积岩活动终止的触发因素可能是海平面相对稳定和快速源汇过程期间侵蚀率急剧下降。正如其他已发表的记录所示，随后发生的博林/阿勒罗德暖间层和新仙女木冷层间事件以及随之而来的海平面快速上升事件可能引起了孟加拉扇浊流活动的调整。总之，我们表明北半球高纬度气候突变与低纬度南亚深海浊流活动之间存在密切联系。