Austrian climate models underestimated warming

Austria's initial climate scenarios, released in 2015, modeled the effects of climate change until 2100 but have since been shown to underestimate the actual warming trend. While the core predictions about shifting precipitation patterns, wetter winters and drier summers, remain valid, observed temperatures have risen more sharply than the models predicted.

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The temperatures in the model simulations, which formed the basis for the Austrian scenarios, are significantly below those we have observed in recent decades up to now.

Experts suggest that a significant factor contributing to this discrepancy is the reduction in aerosols, fine particles in the air that have a cooling effect by scattering solar radiation and promoting cloud formation. As air pollution has decreased in Europe, this natural cooling mechanism has weakened, leading to a more pronounced warming effect than anticipated. This factor is expected to be integrated into future climate models.

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Aerosols have a cooling effect on the Earth's surface, as they scatter solar radiation and promote cloud formation. This was not sufficiently considered in the models; however, the factor will be integrated into the next generation of models.

The development of new Austrian climate scenarios, due in 2027, involves re-evaluating the 2015 models and identifying areas for improvement. Climate scientists emphasize the need to consider longer timeframes, as climate states are typically described over 30-year periods. Short-term deviations, known as internal climate variability, can cause fluctuations from year to year, making it challenging to assess long-term trends after only a decade. The next generation of models will aim to better account for these complex interactions.

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Climate states are often described over 30 years. You cannot say after ten years that the calculated course 'fits' or 'does not fit'.