A new investigation suggests that the combination of various natural climatic cycles may have been a determining factor in the decline of several Bronze Age civilizations, which occurred approximately 3,200 years ago in the Mediterranean area. The study, published in the journal Science Advances, establishes a link between periods of extreme drought and the weakening of societies that were already fragile.
Climatic Research Methodology
Scientists from Stockholm University conducted this research using an advanced climate model capable of recreating the environmental conditions of the last eight millennia. The analysis demonstrated that progressive climatic changes added to shorter-duration natural fluctuations, resulting in an intensification of water scarcity.
The researchers concluded that this scenario reduced the amount of available water, putting pressure on agricultural production and compromising food security, elements that may have led to the simultaneous collapse of distinct civilizations in the eastern Mediterranean.
Detailed Analysis of Droughts
To investigate the causes of droughts in the eastern Mediterranean, PhD student Katherine Power and Professor Qiong Zhang applied the EC-Earth 3.3.1 climate model, usually used in future climate predictions. This time, the tool was used to reconstruct the environment of the last eight thousand years and map long-term patterns.
Katherine Power explained in a note released by Stockholm University that the most severe drought episodes were not the result of a single climatic event. She stated that the most severe droughts occurred when natural climatic cycles operating on different timescales converged, which helps justify the severity of droughts linked to the Late Bronze Age collapse.
Environmental and Historical Impacts
The findings also indicate that the Mediterranean experienced a slow process of drying over millennia, driven by slow changes in Earth's orbit. In parallel, smaller oscillations related to the Atlantic Ocean and the atmosphere affected the intensity of these climatic conditions. While long-term changes allowed some capacity for population adaptation, faster variations could affect vast regions unexpectedly, increasing impacts on communities dependent on agriculture and generating cascading effects.
The scientists identified three major phases of prolonged drought in the eastern Mediterranean, caused by the coincidence of these natural cycles. The most recent occurred concurrently with the decline of several civilizations during the Late Bronze Age. Climate reconstruction shows that the reduction in rainfall began in parts of the Balkans about 3,400 years ago. Around 1100 BC, the decrease in precipitation was already more widespread, and approximately in 1050 BC, the region recorded lower temperatures.
The authors mention that these results are consistent with indirect evidence found in geological formations, such as stalactites, which signal drops of 15% to 30% in rainfall in certain locations. According to Katherine Power, the combination of these processes exceeded a critical limit for water availability in the region, decreasing water and increasing pressure on agriculture and food security in already vulnerable societies.
Additional Factors and Current Relevance
The study also highlights that small changes in the balance between evaporation and precipitation can cause disproportionate consequences for vegetation, food production, and the stability of natural resources, especially when ecosystems and agricultural systems operate near their moisture limits. In addition to climatic influence, the work recalls that other factors, such as technological transformations and invasions attributed to the Sea Peoples, are also linked to the collapse of the civilizations of that era. However, the authors observe that even these population displacements may have been influenced by the climatic conditions faced in their origins.
The researchers emphasize that the findings are important for the present, given that the Mediterranean is considered one of the areas most susceptible to climate change, with projections indicating a hotter and drier future. Katherine Power concludes that understanding the interaction between warming caused by human actions and the natural variability of the Atlantic Ocean will be crucial for assessing drought risks in the coming decades, although more research is needed.
