Climate Change Could Lead To More Violent Thunderstorms

by VR Sreeraman on  July 14, 2012 at 8:10 PM Environmental Health   - G J E 4
A researcher has predicted that for every single degree of warming, there will be approximately 10 percent rise in lightning activity.
 Climate Change Could Lead To More Violent Thunderstorms
Climate Change Could Lead To More Violent Thunderstorms

According to Prof. Colin Price, Head of the Department of Geophysics, Atmospheric and Planetary Sciences at Tel Aviv University, this could have negative consequences in the form of flash floods, wild fires, or damage to power lines and other infrastructure.

In an ongoing project to determine the impact of climate change on the world's lightning and thunderstorm patterns, he and his colleagues have run computer climate models and studied real-life examples of climate change, such as the El Nino cycle in Indonesia and Southeast Asia, to determine how changing weather conditions impact storms.

An increase in lightning activity will have particular impact in areas that become warmer and drier as global warming progresses, including the Mediterranean and the Southern United States, according to the 2007 United Nations report on climate change.

When running their state-of-the-art computer models, Price and his fellow researchers assess climate conditions in a variety of real environments.

First, the models are run with current atmospheric conditions to see how accurately they are able to depict the frequency and severity of thunderstorms and lightning in today's environment.

Then, they input changes to the model atmosphere, including the amount of carbon dioxide in the atmosphere, which is a major cause of global warming, to see how storms are impacted.

To test the lightning activity findings, Price compared their results with vastly differing real-world climates, such as dry Africa and the wet Amazon, and regions where climate change occurs naturally, such as Indonesia and Southeast Asia, where El Nino causes the air to become warmer and drier.

The El Nino phenomenon is an optimal tool for measuring the impact of climate change on storms because the climate oscillates radically between years, while everything else in the environment remains constant.

"During El Nino years, which occur in the Pacific Ocean or Basin, Southeast Asia gets warmer and drier. There are fewer thunderstorms, but we found fifty percent more lightning activity," Price said.

Typically, he says, we would expect drier conditions to produce less lightning. However, researchers also found that while there were fewer thunderstorms, the ones that did occur were more intense.

An increase in lightning and intense thunderstorms can have severe implications for the environment, Price said.

More frequent and intense wildfires could result in parts of the US, such as the Rockies, in which many fires are started by lightning.

A drier environment could also lead fires to spread more widely and quickly, making them more devastating than ever before. These fires would also release far more smoke into the air than before.

The study has been published in the Journal of Geophysical Research and Atmospheric Research, and has been presented at the International Conference on Lightning Protection.

Source: ANI

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