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Fire plays a pivotal role in shaping terrestrial ecosystems and the chemical composition of the atmosphere and thus influences Earth’s climate. The trend and magnitude of fire activity over the past few centuries are controversial, which hinders understanding of preindustrial to present-day aerosol radiative forcing. Here, we present evidence from records of 14 Antarctic ice cores and 1 central Andean ice core, suggesting that historical fire activity in the Southern Hemisphere (SH) exceeded present-day levels. To understand this observation, we use a global fire model to show that overall SH fire emissions could have declined by 30% over the 20th century, possibly because of the rapid expansion of land use for agriculture and animal production in middle to high latitudes. Radiative forcing calculations suggest that the decreasing trend in SH fire emissions over the past century largely compensates for the cooling effect of increasing aerosols from fossil fuel and biofuel sources. ....

South Africa , United States , Assimilation Office , Goddard Institute For Space Studies , Desert Research Institute , Southern Hemisphere , Northern Hemisphere , Sixth Coupled Model Intercomparison , Little Ice Age , North America , Single Particle Soot Photometer , Droplet Measurement Technologies , Modern Era Retrospective , West Antarctic Ice Sheet Divide , Goddard Institute , Space Studies , Argentine Patagonia , ஒன்றுபட்டது மாநிலங்களில் , கோடார்ட் நிறுவனம் க்கு இடம் ஆய்வுகள் , பாலைவனம் ஆராய்ச்சி நிறுவனம் , தெற்கு அரைக்கோளம் , வடக்கு அரைக்கோளம் , கொஞ்சம் பனி வாழ்நாள் , வடக்கு அமெரிக்கா , நவீன சகாப்தம் சுயபரிசோதனை , மேற்கு அண்டார்டிக் பனி தாள் பிரி ,