Atlantic Deep-water Response to the Early Pliocene Shoaling of the Central American Seaway

摘要: The early Pliocene shoaling of the Central American Seaway (CAS), ~4.7–4.2 million years ago (mega annum-Ma), is thought to have strengthened Atlantic Meridional Overturning Circulation (AMOC). associated increase in northward flux heat and moisture may significantly influenced evolution climate. While some evidence for predicted North Deep Water (NADW) formation exists Caribbean Western Atlantic, similar missing wider Atlantic. Here, we present stable carbon (δ13C) oxygen (δ18O) isotope records from Southeast Atlantic-a key region monitoring southern extent NADW. Using these data, together with other δ13C δ18O assess impact CAS phase on deep-water circulation. We find that NADW was vigorous prior 4.7 Ma showed limited subsequent change. Hence, overall structure deep largely unaffected by shoaling, corroborating indicates larger changes resulted earlier deeper phases. This finding implies had no profound