Palaeoclimatology

Palaeoclimatology reconstructs Earth’s past climates by analysing natural archives—such as ice cores, speleothems, lake and marine sediments, loess deposits, corals and tree rings—that preserve chemical and biological signatures of temperature, precipitation and atmospheric composition. These records extend our view far beyond the instrumental era and reveal the full spectrum of climate variability from seasonal cycles to glacial–interglacial swings. Key methods include measurement of stable-water-isotope ratios to infer temperature and hydrological changes; radiocarbon and uranium–thorium dating to establish chronologies; trace-element and aerosol analyses to track volcanic, dust and biogenic inputs; and pollen and fossil assemblages to map shifts in vegetation linked to moisture and warmth. By integrating multiple proxies, it is possible to distinguish natural modes of variability—such as orbital forcing, monsoon strength and abrupt events—from human-driven changes in greenhouse-gas concentrations and land use. Palaeoclimatic data underpin climate-model calibration, improve understanding of feedbacks and thresholds, and inform projections of future change, including sea-level rise, shifts in rainfall patterns and the likelihood of extreme events.

Research from Nature Portfolio

Recent high-resolution records from Antarctic ice demonstrate that orbital-scale climate variability over the past 800 000 years was punctuated by abrupt shifts in Southern Ocean wind strength and heat transport. These findings refine our view of how changes in atmospheric circulation contributed to glacial intensification and the onset of Northern Hemisphere glaciation. In tropical East Africa, speleothem geochemistry spanning the last 75 000 years reveals a reversal of the temperature–moisture relationship at the Holocene onset, indicating that warming beyond a critical threshold shifted the balance from precipitation-driven to evaporation-dominated moisture budgets. Coral Sr/Ca records from the western Indian Ocean show that mid-Holocene sea-surface temperature seasonality was markedly reduced compared with today, implying a westward expansion of the warm pool under altered insolation and enhanced ocean–atmosphere feedbacks.

Palaeoclimatology publication trend

The graph below shows the total number of articles in palaeoclimatology across all publications each year (not limited to Nature Index journals).

Technical terms

Proxy: A physical, chemical or biological indicator preserved in natural archives that can be calibrated to infer past environmental variables such as temperature or precipitation.

Marine Isotope Stage (MIS): Numbered intervals of warm (interglacial) and cold (glacial) climate, defined by oxygen-isotope ratios in foraminifera from marine sediment cores.

Speleothem: A mineral deposit (e.g. stalagmite) formed in limestone caves by precipitation of calcite from drip water, recording geochemical variations linked to surface climate.

Loess: Wind-blown silt deposited in thick sequences that alternate with palaeosols, reflecting glacial dust fluxes and interglacial soil formation under warmer, wetter conditions.

Radiative forcing: The change in energy balance at the top of the atmosphere, expressed in watts per square metre, due to factors such as greenhouse-gas changes or aerosol loading.

Radiocarbon dating: A geochronological method based on the decay of carbon-14 in organic matter, providing calendar ages for sediments and biological remains up to ~50 000 years old.

References

1. Rapid strengthening of westerlies accompanied intensification of Northern Hemisphere glaciation. Nature Communications (2023).
2. Reversed Holocene temperature–moisture relationship in the Horn of Africa. Nature (2023).
3. Mid-Holocene expansion of the Indian Ocean warm pool documented in coral Sr/Ca records from Kenya. Scientific Reports (2023).
4. A Late Pleistocene sea level stack. Climate of the Past (2016).
5. Last Glacial loess in Europe: luminescence database and chronology of deposition. Earth System Science Data (2023).
6. SISALv3: a global speleothem stable isotope and trace element database. Earth System Science Data (2024).