North Atlantic Holocene climate evolution recorded by high-resolution terrestrial and marine biomarker records

摘要: Abstract Holocene climatic change is driven by a plethora of forcing mechanisms acting on different time scales, including: insolation, internal ocean (e.g. Atlantic Meridional Overturning Circulation; AMOC) and atmospheric North Oscillation; NAO) variability. However, it unclear how these driving interact with each other. Here we present five, biomarker based, paleoclimate records (air-, sea surface temperature precipitation), from fjordic sediment core, revealing terrestrial marine climate in unprecedented detail. The Early (10.7–7.8 kyrs BP) characterised relatively high air temperatures while SSTs are dampened melt water events, low precipitation. Middle (7.8–3.2 peak SSTs, declining A pronounced thermal maximum occurs between ∼7–5.5 BP, 3000 years after the maximum, cessation an accelerating AMOC. neoglacial cooling, 5.8 3.2 BP leads into late Holocene. We demonstrate that observed modern link Icelandic precipitation variability during NAO phases, may have existed ∼7.5 BP. simultaneous decoupling both air, insolation at ∼3.2 indicate threshold, which feedback mechanisms, namely evolved to be primary drivers centennial time-scales.