Science of dating events using ice bound datagridview not updating datasource
They were able to assign more accurate dates to 238 eruptions, including two particularly dramatic ones in the 6th century that triggered lower temperatures and possibly contributed to plagues, famines and other woes at the dawn of the Middle Ages.
The work, published this week in the journal Nature, reinforces scientists' understanding of how volcanoes influence variations in climate and confirms that they have a significant cooling effect, some experts said.
The findings, described in the journal Geophysical Review Letters, reveal that our nearest planetary neighbor could be far more active than previously thought. Hidden beneath a thick atmosphere, volcanoes may still be erupting on the surface of Venus, a new study finds.
The one that, three times in the last 2 million years, spewed enormous amounts of ash over the North American continent?
The study also helps resolve a long-standing discrepancy about the timing of eruptions as measured by ice cores (which record them via sulfate deposits) and tree rings (which bear signatures of the subsequent cooling), they said."Before this work, the tree rings and the ice core records diverged.
In the new dating, they line right up," said hydrologist and study coauthor Joe Mc Connell of the Desert Research Institute in Reno.
The findings, described in the journal Geophysical Review Letters, reveal that our nearest planetary neighbor could be far more active than previously thought. (Amina Khan)What set the new study apart from ice core analyses performed in the past, Mc Connell said, was the team's ability to make higher-resolution measurements of the sulfates deposited by eruptions and the decision to analyze a larger-than-usual number of cores.
The team also calibrated its data by studying signatures of a "cosmic ray event" in space, dated to around the year 775, in both the ice cores and the tree rings.