Edward Lorentz, an American mathematician, famously asked whether a butterfly flapping its wings in Brazil could cause a tornado in Texas through a chaotic domino effect.
The question might have gained the same amount of notoriety had he instead inquired as to whether or not sufficient locusts flapping their wings could propel the air with the force of a thunderstorm. He didn't, but we now know why.
The flapping of a lot of tiny wings can electrify the air in the same way that swirling clouds of water vapor can charge the air inside a storm, according to a new study on how flying insects can affect atmospheric electric fields.
This does not necessitate worrying about biblical plagues of lightning-shooting locusts, but it may indicate that biological phenomena must be taken into account when modeling localized patterns in the electric field of the atmosphere.
Electrons are being jostled like loose change in a runner's pocket when you zoom in close to the atoms that make up dust, moisture, and insect body parts that are zipping about in the air above.
A difference known as a potential gradient can be created when those negatively charged particles are jostled enough to spill out of their positively charged pockets.
Small ice fragments rising in air columns can rub against larger fragments falling toward the ground during a storm, resulting in a conveyer belt of charges that magnifies potential gradients between cloud tops, cloud bottoms, and the ground below.
While the effects are not, the charge buildup is virtually invisible. Ionized channels form when the gradient reaches a tipping point, effectively evening out the balance in a flurry that can be seen as lightning.
Zones with opposite charges can influence the movement of ions, including various pollutants and dust particles, even in the absence of lightning.
Although cloud movements, precipitation, and even cosmic ray showers can all have an impact on the magnitude and location of potential gradients, no one has really considered the impact of biological phenomena up until this point.
According to Ellard Hunting, the study's first author and a biologist at the University of Bristol in the United Kingdom, "at some point, we realized that biology might also be influencing physics." "We always looked at how physics influenced biology," Hunting says.
"We're interested in how various organisms make use of the static electric fields that are almost everywhere in the environment," the researchers say.
In recent years, it has become abundantly clear that insects and other invertebrates are capable of carrying charges that provide them with a small potential against the atmosphere.This trick might even be used by young spiders to shoot themselves into the air.
However, no measurements have been made of how this tiny potential assembles in swarms. So Hunting and his team went to a field station run by the University of Bristol School of Veterinary Sciences to wait for a honeybee swarm.
The researchers monitored the density of the bees with an electric field monitor and a camera to determine the local potential gradient of a swarm traveling.The insects sped by for three minutes, raising the potential gradient above by up to one hundred volts per meter.
The researchers were able to predict with some degree of confidence how a certain number of bees buzzing through a particular patch of air might affect the atmosphere's charge after a subsequent analysis confirmed that the voltage was related to the concentration of the swarm.
The team applied the same logic to other swarming insects because they were aware that their estimates stood up to testing for bees.
The researchers estimated that a significant locust swarm could potentially generate densities of charge similar to those found in electrical storms by scaling up the individual charges of locusts to plague-sized numbers.
According to atmospheric physicist Giles Harrison of the University of Reading, "interdisciplinarity is valuable here – electric charge can appear to live solely in physics, but it is important to know how aware the whole natural world is of electricity in the atmosphere."
At the other end of the scale, the butterfly, a chaotic agent that could cause a tornado, would need a lot of people to work together to change the voltage of the atmosphere in a big way.
That probably works out well.
This research was published in iScience.
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