Sustainability

Category Archives: extreme weather

One of the most worrisome predictions about climate change may be coming true

Two years ago, former NASA climate scientist James Hansen and a number of colleagues laid out a dire scenario in which gigantic pulses of fresh water from melting glaciers could upend the circulation of the oceans, leading to a world of fast-rising seas and even superstorms.

Hansen’s scenario was based on a computer simulation, not hard data from the real world, and met with skepticism from a number of other climate scientists. But now, a new oceanographic study appears to have confirmed one aspect of this picture — in its early stages, at least.

The new research, based on ocean measurements off the coast of East Antarctica, shows that melting Antarctic glaciers are indeed freshening the ocean around them. And this, in turn, is blocking a process in which cold and salty ocean water sinks below the sea surface in winter, forming “the densest water on the Earth,” in the words of study lead author Alessandro Silvano, a researcher with the University of Tasmania in Hobart.

https://www.washingtonpost.com/news/energy-environment/wp/2018/04/23/one-of-the-most-worrisome-predictions-about-climate-change-may-be-coming-true/?noredirect=on&utm_term=.350ee40a21c8

The ‘nightmare’ California flood more dangerous than a huge earthquake

California’s drought-to-deluge cycle can mask the dangers Mother Nature can have in store.

During one of the driest March-through-February time periods ever recorded in Southern California, an intense storm dumped so much rain on Montecito in January that mudflows slammed into entire rows of homes. Hundreds of homes were damaged or destroyed, and at least 21 people died.

It was a grim reminder that in a place so dry, sudden flooding can bring disaster.

Eighty years ago this month, epic storms over just six days caused widespread destruction across Southern California.

Rain fell as fast as 2 inches for a one-hour period. Wide swaths of the San Fernando Valley were inundated; floodwaters in the Los Angeles River mowed down bridges and pulled apart railroads.

Government officials responded with a major flood control campaign, building dams and deepening rivers and lining them with concrete to flush water out to sea before floodwaters could rise.

But even those protections have limits. And history shows there is precedent for even more devastation.

Several weeks of monumental storms would be all it would take to overwhelm California’s flood control system and cause widespread flooding and destruction.

http://www.latimes.com/la-me-california-flood-20180325-htmlstory.html

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