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Pastimes : Severe weather events, climate change and economics
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From: Sam8/31/2017 11:38:10 PM
   of 566
 
edf.org Extreme weather gets a boost from climate change

Scientists are detecting a stronger link between the planet’s warming and its changing weather patterns.

Though it can be hard to pinpoint whether climate change intensified a particular weather event, we’re learning more.

Heat and drought The dangerous effects of heat waves, including death, occur as a result of both temperature and humidity – especially if those conditions persist for more than two days.

With temperature records being smashed month after month, year after year, it’s likely that human-caused global warming is making extreme heat events more frequent.

Higher temperatures also boost evaporation, which dries out the soil in summer – intensifying drought over many areas.

Storms and floods As more evaporation leads to more moisture in the atmosphere, rainfall intensifies.

While scientists aren’t certain about whether climate change has led to more hurricanes, or more destructive ones, they are confident that rising sea levels are leading to higher storm surges and more floods.

Clouds that can dump a lot of rain are more common in a warmer atmosphere.

Ilissa Ocko Climate Scientist
Most of the sea-level rise comes from the expansion of warming oceans, triggered by human-caused global warming. (Like all liquids, water generally expands as it heats up.) The rest of the rise comes from melting glaciers and ice sheets.

Snow and frigid weather


A warmer atmosphere holds more moisture and can bring record snowfall.

It may seem counterintuitive, but more snowfall during winter storms indicates climate change.

Remember – a warmer atmosphere holds more moisture. So when the temperatures are below freezing, snowfall can break records.

And scientists are studying a possible connection between a warming Arctic and cold winters in the eastern United States. The idea is that melting sea ice in the Arctic can weaken the jet stream, allowing frigid polar air to travel farther south.
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