Climate Change Processes

Climate change arises from a persistent imbalance in Earth’s energy budget caused by the accumulation of greenhouse gases in the atmosphere. Incoming short-wave radiation from the Sun is partially absorbed at the surface and re-emitted as long-wave (infrared) radiation, which molecules such as carbon dioxide and methane retain, warming the lower atmosphere. Feedbacks—water-vapour amplification, ice-albedo loss and changes in cloud properties—modulate this warming. The ocean absorbs over 90 % of excess heat and about one-third of anthropogenic carbon, altering stratification and circulation, while the cryosphere records these changes through shrinking ice sheets, thawing permafrost and declining sea-ice cover. Land processes—vegetation growth under elevated CO₂, soil microbial responses and shifts in hydrology—affect carbon and water cycles. Atmosphere–ocean–land interactions govern large-scale circulation patterns, teleconnections and extreme-event statistics, from heatwaves and droughts to heavy rainfall and storm-track shifts. Under continued emissions, global mean surface temperature is projected to rise further, intensifying these processes and testing the capacity of natural and human systems to adapt. Monitoring cumulative carbon budgets and implementing rapid emissions reductions are essential to stabilise climate drivers and avert the most severe outcomes.

Research from Nature Portfolio

Recent studies leveraging in situ measurements of North African mineral dust reveal that its absorption of solar radiation is substantially lower than assumed in many climate and chemical-transport models. Revised single-scattering albedo values and particle-size distributions indicate that overestimated refractive indices have led to biases in absorption aerosol optical depth and its radiative forcing.

A synthesis of stratosphere–troposphere coupling demonstrates that variations in the polar vortex and sudden stratospheric warmings exert a major influence on surface extremes. Disruptions of stratospheric circulation have been linked to clusters of cold outbreaks, heatwaves, wildfire smoke incursions and shifts in mid-latitude storm tracks, underscoring the importance of high-altitude processes for sub-seasonal predictability.

Analysis of lower-stratospheric variability shows that weak polar-vortex conditions disproportionately heighten the risk of severe cold-air outbreaks in East Asia and Europe, through enhanced inter-hemispheric transport of cold air masses. These findings highlight predictable pathways by which stratospheric state modulates regional temperature extremes.

Research from all publishers

In a mature temperate oak forest subjected to free-air CO₂ enrichment, gross nitrogen mineralisation and microbial immobilisation increased by roughly 20 %, supporting enhanced canopy CO₂ uptake but also elevating soil N₂O emissions, signalling a potential positive feedback on greenhouse warming and a constraint on long-term carbon sequestration.

Long-term experiments in a species-rich grassland demonstrate that elevated CO₂ effects on root-associated bacterial communities depend on plant diversity and nitrogen availability. Functional gene analyses indicate that combined CO₂ and N enrichment alters the abundance of nitrogen-fixation, nitrate-reduction and phosphorus-solubilisation taxa, revealing the contingent nature of belowground responses under interacting global-change drivers.

Climate Change Processes publication trend

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

Technical terms

Greenhouse effect: The trapping of infrared radiation by atmospheric gases, leading to surface warming.

Radiative forcing: The net change in Earth’s energy balance at the top of the atmosphere, measured in watts per square metre.

Single-scattering albedo: The fraction of incident light scattered (rather than absorbed) by an aerosol particle.

Stratosphere–troposphere coupling: The downward influence of stratospheric circulation anomalies on weather patterns in the lower atmosphere.

Gross nitrogen mineralisation: The sum of organic nitrogen conversion to ammonium in soil via microbial processes.

Free-air CO₂ enrichment (FACE): A field experiment that raises atmospheric CO₂ around vegetation plots to study ecosystem responses without enclosure effects.

References

1. Observations suggest that North African dust absorbs less solar radiation than models estimate. Communications Earth & Environment (2023).
2. Stratospheric drivers of extreme events at the Earth’s surface. Communications Earth & Environment (2020).
3. Northern hemisphere cold air outbreaks are more likely to be severe during weak polar vortex conditions. Communications Earth & Environment (2021).
4. Stimulation of soil gross nitrogen transformations and nitrous oxide emission under Free air CO2 enrichment in a mature temperate oak forest at BIFoR-FACE. Soil Biology and Biochemistry (2023).
5. Plant diversity and functional identity drive grassland rhizobacterial community responses after 15 years of CO2 and nitrogen enrichment. Journal of Ecology (2024).
6. Climate Change Overview.