Climate Variability and Palaeoclimate Dynamics in the North Atlantic

The North Atlantic basin exerts a pivotal influence on global climate through its role in heat and salt redistribution via the Atlantic Meridional Overturning Circulation (AMOC). Variations in sea‐surface temperatures, sea‐ice cover and deep‐water formation drive fluctuations on orbital (10^4–10^5 yr), millennial and decadal timescales. Palaeoarchive proxies from marine sediments, ice cores and terrestrial records reveal recurring Dansgaard–Oeschger cycles and Heinrich events during glacial periods, reflecting rapid shifts between cold stadials and warm interstadials. Orbital forcing by precession, obliquity and eccentricity modulates insolation and thereby glacial–interglacial pacing. Coupled atmosphere–ocean feedbacks amplify these variations, with meltwater pulses and changing sea‐ice extent altering density gradients and overturning strength. High‐resolution reconstructions off the Iberian margin and subpolar sites illustrate the sensitivity of moisture transport, westerly winds and iceberg discharge to North Atlantic sea‐surface anomalies. Understanding past abrupt changes refines projections of future AMOC stability, informs sea‐level rise assessments and underpins strategies for climate resilience in Europe and beyond.

Research from Nature Portfolio

Recent studies have combined high‐resolution proxy records and climate modelling to elucidate the Late Pleistocene transition in the North Atlantic. Analyses of sea‐surface temperature and pollen assemblages from Iberian‐margin cores demonstrate that anomalously warm glacial sea‐surface conditions sustained enhanced moisture transport by westerly winds, fuelling ice‐sheet growth during Marine Isotope Stage 18. Complementary model experiments indicate that persistent oceanic warmth can maintain winter precipitation at mid‐latitudes, highlighting the linkage between glacial thermohaline variations and continental moisture budgets.

Climate Variability and Palaeoclimate Dynamics in the North Atlantic publication trend

The graph below shows the total number of articles in climate variability and palaeoclimate dynamics in the north atlantic across all publications each year (not limited to Nature Index journals).

Technical terms

Palaeoclimate: The study of Earth’s past climate using natural archives such as sediments, ice cores and tree rings.

Proxy: A preserved physical or biological datum that reflects past environmental or climatic conditions.

AMOC (Atlantic Meridional Overturning Circulation): A system of currents in the Atlantic that transports warm surface water northwards and cold deep water southwards.

Dansgaard–Oeschger cycle: Rapid warming events followed by gradual cooling, detected in ice‐core records during the last glacial period.

Heinrich event: Sudden ice‐rafting episodes depositing large numbers of ice‐rafted debris in North Atlantic sediments during glacial times.

Marine Isotope Stage (MIS): A numbered interval of warm or cold global climate inferred from oxygen‐isotope ratios in marine sediment cores.

References

1. Moist and warm conditions in Eurasia during the last glacial of the Middle Pleistocene Transition. Nature Communications (2023).
2. Pollen from the Deep-Sea: A Breakthrough in the Mystery of the Ice Ages. Frontiers in Plant Science (2018).
3. Interglacial and glacial variability from the last 800 ka in marine, ice and terrestrial archives. Climate of the Past (2011).
4. Marine Isotope Stage 11c: An unusual interglacial. Quaternary Science Reviews (2022).