Water, water everywhere, nor any drop to drink

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jserraglio
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Water, water everywhere, nor any drop to drink

Post by jserraglio » Thu May 17, 2018 2:49 pm

CBS News — Earth has experienced significant shifts in freshwater distribution across the globe thanks to climate change, water management and natural cycles, among other factors, according to a NASA study.
"What we are witnessing is major hydrologic change," said Jay Famiglietti of NASA's Jet Propulsion Laboratory in Pasadena, California. "We see a distinctive pattern of the wetland areas of the world getting wetter -- those are the high latitudes and the tropics -- and the dry areas in between getting dryer. Embedded within the dry areas we see multiple hotspots resulting from groundwater depletion."
Researchers tracked global freshwater trends in nearly three dozen regions worldwide using 14 years of data and imagery from the Gravity Recovery and Climate Experiment (GRACE) mission, which consists of two spacecrafts orbiting Earth. They analyzed the information alongside irrigation maps, precipitation data from the Global Precipitation Climatology Project, Landsat imagery from the NASA/U.S. Geological Survey and published reports of human activity related to agriculture, mining and reservoir operations, according to a news release.
The findings of the first-of-its-kind study were published Wednesday in Nature, a scientific journal.
"This is the first time that we've used observations from multiple satellites in a thorough assessment of how freshwater availability is changing, everywhere on Earth," Matt Rodell of NASA's Goddard Space Flight Center, said in the news release.
"A key goal was to distinguish shifts in terrestrial water storage caused by natural variability -- wet periods and dry periods associated with El Niño and La Niña, for example -- from trends related to climate change or human impacts, like pumping groundwater out of an aquifer faster than it is replenished," he said.
In some regions, like those with melting alpine glaciers and ice sheets, climate change is a clear driver of water loss, according to Famiglietti.
Agricultural practices also have a big impact. Pumping groundwater for agriculture significantly contributed to freshwater depletion around the world during the period studied, which could explain a decline in freshwater that was observed in Saudi Arabia, for example.
Levels of groundwater are also impacted by drought cycles and persistent rain, according to NASA.

RebLem
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Re: Water, water everywhere, nor any drop to drink

Post by RebLem » Thu May 17, 2018 2:57 pm

40% of the world's fresh water lies in the Great Lakes. But, in my view, we made a big mistake when we built the St Lawrence Seaway, which has allowed non-native salt water species to invade the Great Lakes and destroy most of the native stocks of fresh water fish. Its a shame.
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jserraglio
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Location: Cleveland, Ohio

Re: Water, water everywhere, nor any drop to drink

Post by jserraglio » Thu May 17, 2018 5:29 pm

Lake Erie still has outstanding walleye and small bass sport fisheries; some rank the walleye fishing as the best in the world. But yes, there have also been many environmental problems, not all of which were caused by the Seaway. Erie once was considered the top fishing lake in the world.

lennygoran
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Re: Water, water everywhere, nor any drop to drink

Post by lennygoran » Fri May 18, 2018 5:59 am

jserraglio wrote:
Thu May 17, 2018 5:29 pm
Lake Erie still has outstanding walleye
I've never seen this fish on a menu so I googled and found this:

People also ask
Is the walleye fish good to eat?
Walleye Fishing Is Awesome, But Walleye Eating Is Better. There are many types of fish out there, and most are edible if cooked right. ... There are many ways to catch walleye, and many places to fish for them, but once you eat one for dinner, you'll be hooked. Here is one of my favorite ways to cook then eat walleye.Jul 17, 2012

Regards, Len [getting hungry]

jserraglio
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Location: Cleveland, Ohio

Re: Water, water everywhere, nor any drop to drink

Post by jserraglio » Fri May 18, 2018 6:07 am

Image

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