It is proven that large eruptions can create clouds with the potential to block some of the sunlight for a year or two. These types of situations reduce the summer warming of the land in Asia, so there will be weaker monsoons with less rainfall and, therefore, a reduction in harvests. Alan Robock, Professor in the Department of Environmental Sciences at the School of Biological and Environmental Sciences states: “We have confirmed for the first time that the collapse of dynasties in China during the last 2000 years are most likely in the years after volcanic eruptions.” . But there are other variables that make the study complex, “because if there are wars and conflicts, dynasties are more susceptible to collapse.” However, we find possible feedback, since “the impact of a cold climate on crops can make conflicts more likely”.
The Rutgers team has analyzed 156 explosive volcanic eruptions since 1 AD. C. until the year 1915. It has found high levels of sulfate in the ice cores extracted from Greenland and Antarctica. But they did not stay in the field and laboratory study: they investigated the historical documentation of China on 68 dynasties and the wars that occurred between 850 and 1911. They took major volcanic eruptions and saw in an approximation window of between -10 and 2 years if there were some collapse occurred. It occurred in 62 of the 68 cases. As we well know, correlation does not imply causality, however, both data and causes are, at least, plausible. Using the Monte Carlo method, they generated random volcanic eruptions and, indeed, the average number of eruptions that actually occurred in the chosen time window was higher than that expected by chance, with a confidence interval of 99.95%, while the Average across adjacent windows was uniformly lower.
It is really difficult to demonstrate a direct correlation between volcanic eruptions and changes in government regimes, since the number of variables is enormous. More when we talk about people. Even with religious or supernatural beliefs. The “mandate of heaven” was a concept widely used in traditional Chinese philosophy that served to maintain stability between so many coming and going of rulers, contributing to a certain continuity between the dynasties. Both elites and commoners were more accepting of a change of situation if the order was of extraterrestrial origin than if it occurred through a violent seizure of power. Some of the collapses occurred rather quickly, in the context of intense conflict, significant socioeconomic disruption, and population loss. But others occurred as less disruptive transitions, with considerable continuity from a bureaucratic and economic point of view. These periods are situated in the “dynastic cycles”, in which there is a period of splendor, followed by a decline and a final collapse, traditionally attributed to the immorality or corruption of the ruling family. Although controversial, climatic stresses have begun to take a major role in historical study. The collapses of the Tang (907), Yuan (1368) and Ming (1644) dynasties are linked to periods of drought and cold. Explosive volcanism is proposed as a reinforcing element associated with specific individual collapses. Cold and drought impacts from volcanic eruptions can, in turn, lead to livestock deaths, accelerated land degradation, and additional damage to crops due to the survival of agricultural pests.
This original work has recently been published in the journal Communications Earth & Environment, under the title Volcanic climate impacts can act as ultimate and proximate causes of Chinese dynastic collapse . The historical-scientific finding presented places special emphasis on the need for a good preparation for future eruptions. Especially in regions with economically vulnerable populations, such as the Ming and Tang dynasties, or with poor resource management. The eruptions of the 20th and 21st centuries have been smaller than historical ones in Imperial China. However, moderate eruptions may also have affected Sahel droughts in some way in the 1970s and 1990s, contributing to the death of 250,000 people and the displacement of 10 million refugees. It is quite possible that climate change coupled with major eruptions will dramatically affect the most populated and marginalized regions of the planet.
However, the article not only mentions the direct effects of volcanic eruptions, but also those that have occurred on citizens. The dynasties could have taken advantage of any type of natural phenomenon to take refuge in the “mandate of heaven”. And the truth is that the change of government has sometimes been beneficial, as discussed in the article itself:
“In fact, instead of being a failure of society, the collapse in this context could be understood more as an adaptation to environmental, political and other threatening situations, as a consequence of a deeply ingrained cultural (socio-ecological) conception of the nature of government, dynastic legitimacy and change ”.
This article has been adapted from: Volcanic eruptions contributed to collapse of China dynasties and from the original article.
