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See how Sparse the Sierra Nevada Snowpack Looks Compared to Last Year

/in , /by /The Mercury Newsby Paul Rogers

Two NASA satellite images released late Monday by the National Weather Service office in Sacramento starkly illustrate how much less snow is covering the Sierra Nevada this week compared to the same time a year ago.

The images, taken from roughly 438 miles above Earth, show California’s Sierra Nevada range. In the first, from Feb. 18, 2019, the region is blanketed with snow. On that day, the snowpack, which is the source of about one-third of the state’s annual water supply, was at 147% of its historical statewide average for that date.

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NASA Is Tracking One Of Earth’s Most Valuable Resources — Water

/in , , /by /Space.com (New York)by Elizabeth Howell

Water is a complex problem on Earth: Some places get far too little of it and some get far too much. That’s why NASA and its international partners are tracking the flow of freshwater across the world in hopes of improving access to it for the billions of us who depend on it. Satellites study how water moves through its cycle. Sometimes it evaporates from warm oceans in the tropics, condenses into clouds and then falls back into the ground as snow or rain. The water might stay in a river or lake — or freeze, locked within ice or snow. It can either evaporate into the atmosphere or soak into the ground, moistening the soil or filling an aquifer.

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NASA Study Says Freshwater Shortages Will Be Biggest Challenge Of This Century

/in , /by /Clean Technicaby Steve Hanley

Researchers have examined data collected by NASA’s Gravity Recovery and Climate Experiment (GRACE)  satellite mission during the period 2002 to 2016 to track freshwater trends worldwide. In a new report, they claim that data shows access to freshwater will be the biggest challenge to humanity in the 21st century. The GRACE data made it possible for the researchers to track changes in freshwater resources around the world even in areas where local data has been scarce or unavailable, according to a report in The Guardian.

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