Climatic Variability and Surface Temperature Trends

Climatic variability and surface temperature trends encompass the patterns and drivers of change in Earth’s surface warmth over interannual to centennial timescales. Observational records derived from land stations, ocean buoys and ship‐based measurements reveal a sustained rise in global mean surface temperature since the mid-twentieth century, punctuated by periods of accelerated warming, hiatus and regional divergence. Natural internal variability, manifesting as ocean–atmosphere oscillations, interacts with external forcings such as greenhouse gas accumulation, aerosol emissions and volcanic eruptions to shape decadal to multidecadal variability. Palaeoclimate proxies extend this record back centuries, providing pre-industrial baselines against which modern change is assessed. Recent advances in bias correction and data homogenisation have refined early instrumental records, while emerging ensemble and reconstruction techniques have improved spatial completeness. Understanding these trends is vital for climate model evaluation, impact assessment and informing adaptation and mitigation strategies worldwide.

Research from Nature Portfolio

Recent studies have reconstructed and corrected early ocean temperature records, revealing that twentieth-century sea‐surface temperatures were underestimated by about 0.25 °C during 1900–1930. Correcting this cold bias refines estimates of early warming rates, reduces inferred decadal variability and improves agreement between observations and climate model simulations. Complementary palaeothermometry spanning three centuries, derived from marine carbonate archives, demonstrates that industrial-era warming began in the 1860s and that by 2020 the global mean had already exceeded 1.5 °C above pre-industrial levels, highlighting a more rapid and earlier onset of anthropogenic warming than previously recognised. In parallel, filtered analyses of the past 50 years of surface temperature series confirm a steady global warming trend of approximately 0.18 °C per decade, with a clear step increase in the rate around 1990, underscoring the need to account for internal variability patterns when detecting changes in long-term warming trajectories.

Climatic Variability and Surface Temperature Trends publication trend

The graph below shows the total number of articles in climatic variability and surface temperature trends across all publications each year (not limited to Nature Index journals).

Technical terms

Global mean surface temperature: the average temperature of Earth’s land and ocean surfaces, used as a primary metric for climate change.

Internal variability: natural fluctuations arising from internal dynamics of the climate system, such as ocean–atmosphere oscillations.

External forcing: factors external to the climate system, including greenhouse gas concentrations, aerosol loading and volcanic activity, that drive changes in energy balance.

Bias correction: statistical or physics-based adjustments applied to raw temperature observations to remove systematic measurement errors or methodological changes.

References

1. Early-twentieth-century cold bias in ocean surface temperature observations. Nature (2024).
2. 300 years of sclerosponge thermometry shows global warming has exceeded 1.5 °C. Nature Climate Change (2024).
3. Steady global surface warming from 1973 to 2022 but increased warming rate after 1990. Communications Earth & Environment (2023).
4. Contributions of external forcing and internal variability to the multidecadal warming rate of East Asia in the present and future climate. npj Climate and Atmospheric Science (2024).
5. A Dynamically Consistent ENsemble of Temperature at the Earth surface since 1850 from the DCENT dataset. Scientific Data (2024).
6. ICOADS Release 3.0: a major update to the historical marine climate record. International Journal of Climatology (2016).