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Related: About this forumClimate Change Has Intensified the Global Water Cycle
Climate scientists have been saying for years that one of the many downsides of a warming planet is that both droughts and torrential rains are both likely to get worse. Thats what climate models predict, and thats what observers have noted, most recently in the IPCCs report on extreme weather, released last month. It makes physical sense, too. A warmer atmosphere can absorb more water vapor, and what goes up must come down and thanks to prevailing winds, it wont come down in the same place.The idea of changes to the so-called hydrologic cycle, in short, hangs together pretty well. According to a new paper just published in Science, however, the picture is flawed in one important and disturbing way. Based on measurements gathered around the world from 1950-2000, a team of researchers from Australia and the U.S. has concluded that the hydrologic cycle is indeed changing. Wet areas are getting wetter and dry areas are getting drier. But its happening about twice as fast as anyone thought, and that could mean big trouble for places like Australia, which has already been experiencing crushing drought in recent years.
The reason for this disconnect between expectation and reality is that the easiest place to collect rainfall data is on land, where scientists and rain gauges are located. About 71 percent of the world is covered in ocean, however. Most of the action, however, takes place over the sea, lead author Paul Durack, a postdoctoral fellow at Lawrence Livermore National Laboratory, said in a telephone interview. In order to get a more comprehensive look at how water is exchanged between the surface and the atmosphere, thats where Durack and his colleagues went to look.
Nobody has rainfall data from the ocean, so Durack and his collaborators looked instead at salinity that is, saltiness in ocean waters. The reasoning is straightforward enough. When water evaporates from the surface of the ocean, it leaves the salt behind. That makes increased saltiness a good proxy for drought. When fresh water rains back down on the ocean, it dilutes the seawater, so decreased saltiness is the equivalent of a land-based flood.
More: http://www.climatecentral.org/news/climate-change-has-intensified-the-global-water-cycle/
Paper (sub): http://www.sciencemag.org/content/336/6080/455
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Climate Change Has Intensified the Global Water Cycle (Original Post)
Dead_Parrot
Apr 2012
OP
Bigmack
(8,020 posts)1. This is the kind of news that SHOULD be
HUGE front page headlines and read by ALL of the Great Unwashed, but, alas, it won't be. I don't claim to be any genius, but I sure DO resent being locked into the consequences of mass willful ignorance. Ms Bigmack
Dead_Parrot
(14,478 posts)3. So many shiny things, so little time.
Sigh.
joshcryer
(62,270 posts)4. Yeah, but climate change has left the headlines.
People just don't want to hear about it.
Sadly Inconvenient Truth was 5 years ahead of its time, imho.
pscot
(21,024 posts)5. I'm not so sure about that
There's a broad general awareness that the weather is really acting strange. It may be just background noise, but it's getting louder. Public concern is growing. Shit, even the President is talking about it, so you know something is changing.
joshcryer
(62,270 posts)6. Yeah, but it was a lot bigger 5 years ago. Remember Live Earth?
GliderGuider
(21,088 posts)2. Like, who cares if it rains over the oceans?
Water is wet, right? Film at 11:00.
Or in other words,
Oh, shit. Twice as fast? ??