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Wednesday, May 15, 2013

Cassini Shapes First Global Topographic Map of Titan

MEDIA RELATIONS OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109 PHONE 818-354-5011
http://www.jpl.nasa.gov

Jia-Rui Cook 818-354-0850
Jet Propulsion Laboratory, Pasadena, Calif.
jccook@jpl.nasa.gov

Michael Buckley 240-228-7536
Johns Hopkins Applied Physics Laboratory, Laurel, Md.
Michael.buckley@jhuapl.edu

News feature: 2013-161 May 15, 2013

Cassini Shapes First Global Topographic Map of Titan

The full version of this story with accompanying images is at:
http://www.jpl.nasa.gov/news/news.php?release=2013-161&cid=release_2013-161

Scientists have created the first global topographic map of Saturn's moon Titan, giving researchers a valuable tool for learning more about one of the most Earth-like and interesting worlds in the solar system. The map was just published as part of a paper in the journal Icarus.

Titan is Saturn's largest moon – at 1,600 miles (2,574 kilometers) across it's bigger than planet Mercury – and is the second-largest moon in the solar system. Scientists care about Titan because it's the only moon in the solar system known to have clouds, surface liquids and a mysterious, thick atmosphere. The cold atmosphere is mostly nitrogen, like Earth's, but the organic compound methane on Titan acts the way water vapor does on Earth, forming clouds and falling as rain and carving the surface with rivers. Organic chemicals, derived from methane, are present in Titan's atmosphere, lakes and rivers and may offer clues about the origins of life.

"Titan has so much interesting activity – like flowing liquids and moving sand dunes – but to understand these processes it's useful to know how the terrain slopes," said Ralph Lorenz, a member of the Cassini radar team based at the Johns Hopkins University Applied Physics Laboratory, Laurel, Md., who led the map-design team. "It's especially helpful to those studying hydrology and modeling Titan's climate and weather, who need to know whether there is high ground or low ground driving their models."

Titan's thick haze scatters light in ways that make it very hard for remote cameras to "see" landscape shapes and shadows, the usual approach to measuring topography on planetary bodies. Virtually all the data we have on Titan comes from NASA's Saturn-orbiting Cassini spacecraft, which has flown past the moon nearly 100 times over the past decade. On many of those flybys, Cassini has used a radar imager, which can peer through the haze, and the radar data can be used to estimate the surface height.

"With this new topographic map, one of the most fascinating and dynamic worlds in our solar system now pops out in 3-D," said Steve Wall, the deputy team lead of Cassini's radar team, based at NASA's Jet Propulsion Laboratory in Pasadena, Calif. "On Earth, rivers, volcanoes and even weather are closely related to heights of surfaces – we're now eager to see what we can learn from them on Titan."

There are challenges, however. "Cassini isn't orbiting Titan," Lorenz said. "We have only imaged about half of Titan's surface, and multiple 'looks' or special observations are needed to estimate the surface heights. If you divided Titan into 1-degree by 1-degree [latitude and longitude] squares, only 11 percent of those squares have topography data in them."

Lorenz's team used a mathematical process called splining – effectively using smooth, curved surfaces to "join" the areas between grids of existing data. "You can take a spot where there is no data, look how close it is to the nearest data, and use various approaches of averaging and estimating to calculate your best guess," he said. "If you pick a point, and all the nearby points are high altitude, you'd need a special reason for thinking that point would be lower. We're mathematically papering over the gaps in our coverage."

The estimations fit with current knowledge of the moon – that its polar regions are "lower" than areas around the equator, for example – but connecting those points allows scientists to add new layers to their studies of Titan's surface, especially those modeling how and where Titan's rivers flow, and the seasonal distribution of its methane rainfall. "The movement of sands and the flow of liquids are influenced by slopes, and mountains can trigger cloud formation and therefore rainfall. This global product now gives modelers a convenient description of this key factor in Titan's dynamic climate system," Lorenz said.

The most recent data used to compile the map is from 2012; Lorenz says it could be worth revising when the Cassini mission ends in 2017, when more data will have accumulated, filling some of the gaps in present coverage. "We felt we couldn't wait and should release an interim product," he says. "The community has been hoping to get this for a while. I think it will stimulate a lot of interesting work."

The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and ASI, the Italian Space Agency. JPL, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington. The radar instrument was built by JPL and the Italian Space Agency, working with team members from the United States and several European countries.

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Monday, May 13, 2013

Satellites See Double Jeopardy For Socal Fire Season

Thursday, May 9, 2013

NASA Curiosity Rover Team Selects Second Drilling Target on Mars

MEDIA RELATIONS OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109. PHONE 818-354-5011
http://www.jpl.nasa.gov

Guy Webster 818-354-6278
Jet Propulsion Laboratory, Pasadena, Calif.
guy.webster@jpl.nasa.gov

Dwayne Brown 202-358-1726
NASA Headquarters, Washington
dwayne.c.brown@nasa.gov

News release: 2013-159 May 9, 2013

NASA Curiosity Rover Team Selects Second Drilling Target on Mars

The full version of this story with accompanying images is at:
http://www.jpl.nasa.gov/news/news.php?release=2013-159&cid=release_2013-159

PASADENA, Calif. -- The team operating NASA's Curiosity Mars rover has selected a second target rock for drilling and sampling. The rover will set course to the drilling location in coming days.

This second drilling target, called "Cumberland," lies about nine feet (2.75 meters) west of the rock where Curiosity's drill first touched Martian stone in February. Curiosity took the first rock sample ever collected on Mars from that rock, called "John Klein." The rover found evidence of an ancient environment favorable for microbial life. Both rocks are flat, with pale veins and a bumpy surface. They are embedded in a layer of rock on the floor of a shallow depression called "Yellowknife Bay."

This second drilling is intended to confirm results from the first drilling, which indicated the chemistry of the first powdered sample from John Klein was much less oxidizing than that of a soil sample the rover scooped up before it began drilling.

"We know there is some cross-contamination from the previous sample each time," said Dawn Sumner, a long-term planner for Curiosity's science team at the University of California at Davis. "For the Cumberland sample, we expect to have most of that cross-contamination come from a similar rock, rather than from very different soil."

Although Cumberland and John Klein are very similar, Cumberland appears to have more of the erosion-resistant granules that cause the surface bumps. The bumps are concretions, or clumps of minerals, which formed when water soaked the rock long ago. Analysis of a sample containing more material from these concretions could provide information about the variability within the rock layer that includes both John Klein and Cumberland.

Mission engineers at NASA's Jet Propulsion Laboratory in Pasadena, Calif., recently finished upgrading Curiosity's operating software following a four-week break. The rover continued monitoring the Martian atmosphere during the break, but the team did not send any new commands because Mars and the sun were positioned in such a way the sun could have blocked or corrupted commands sent from Earth.

Curiosity is about nine months into a two-year prime mission since landing inside Gale Crater on Mars in August 2012. After the second rock drilling in Yellowknife Bay and a few other investigations nearby, the rover will drive toward the base of Mount Sharp, a 3-mile-tall (5-kilometers) layered mountain inside the crater.

JPL, a division of the California Institute of Technology, Pasadena, manages the Mars Science Laboratory Project, of which Curiosity is the centerpiece, for NASA's Science Mission Directorate in Washington.

For more information about the mission, visit: http://www.jpl.nasa.gov/msl , http://www.nasa.gov/msl and http://mars.jpl.nasa.gov/msl . To follow the mission on Facebook and Twitter visit: http://www.facebook.com/marscuriosity and http://www.twitter.com/marscuriosity .

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NASA Curiosity Rover Wins Prestigious Awards

Sifting Through the Atmospheres of Far-off Worlds

MEDIA RELATIONS OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109 PHONE 818-354-5011
http://www.jpl.nasa.gov

Whitney Clavin 818-354-4673
Jet Propulsion Laboratory, Pasadena, Calif.
whitney.clavin@jpl.nasa.gov

News feature: 2013-157 May 8, 2013

Sifting Through the Atmospheres of Far-off Worlds

The full version of this story with accompanying images is at:
http://www.jpl.nasa.gov/news/news.php?release=2013-157&cid=release_2013-157

Gone are the days of being able to count the number of known planets on your fingers. Today, there are more than 800 confirmed exoplanets -- planets that orbit stars beyond our sun -- and more than 2,700 other candidates. What are these exotic planets made of? Unfortunately, you cannot stack them in a jar like marbles and take a closer look. Instead, researchers are coming up with advanced techniques for probing the planets' makeup.

One breakthrough to come in recent years is direct imaging of exoplanets. Ground-based telescopes have begun taking infrared pictures of the planets posing near their stars in family portraits. But to astronomers, a picture is worth even more than a thousand words if its light can be broken apart into a rainbow of different wavelengths.

Those wishes are coming true as researchers are beginning to install infrared cameras on ground-based telescopes equipped with spectrographs. Spectrographs are instruments that spread an object's light apart, revealing signatures of molecules. Project 1640, partly funded by NASA's Jet Propulsion Laboratory, Pasadena, Calif., recently accomplished this goal using the Palomar Observatory near San Diego.

"In just one hour, we were able to get precise composition information about four planets around one overwhelmingly bright star," said Gautam Vasisht of JPL, co-author of the new study appearing in the Astrophysical Journal. "The star is a hundred thousand times as bright as the planets, so we've developed ways to remove that starlight and isolate the extremely faint light of the planets."

Along with ground-based infrared imaging, other strategies for combing through the atmospheres of giant planets are being actively pursued as well. For example, NASA's Spitzer and Hubble space telescopes monitor planets as they cross in front of their stars, and then disappear behind. NASA's upcoming James Webb Space Telescope will use a comparable strategy to study the atmospheres of planets only slightly larger than Earth.

In the new study, the researchers examined HR 8799, a large star orbited by at least four known giant, red planets. Three of the planets were among the first ever directly imaged around a star, thanks to observations from the Gemini and Keck telescopes on Mauna Kea, Hawaii, in 2008. The fourth planet, the closest to the star and the hardest to see, was revealed in images taken by the Keck telescope in 2010.

That alone was a tremendous feat considering that all planet discoveries up until then had been made through indirect means, for example by looking for the wobble of a star induced by the tug of planets.

Those images weren't enough, however, to reveal any information about the planets' chemical composition. That's where spectrographs are needed -- to expose the "fingerprints" of molecules in a planet's atmosphere. Capturing a distant world's spectrum requires gathering even more planet light, and that means further blocking the glare of the star.

Project 1640 accomplished this with a collection of instruments, which the team installs on the ground-based telescopes each time they go on "observing runs." The instrument suite includes a coronagraph to mask out the starlight; an advanced adaptive optics system, which removes the blur of our moving atmosphere by making millions of tiny adjustments to two deformable telescope mirrors; an imaging spectrograph that records 30 images in a rainbow of infrared colors simultaneously; and a state-of-the-art wave front sensor that further adjusts the mirrors to compensate for scattered starlight.

"It's like taking a single picture of the Empire State Building from an airplane that reveals a bump on the sidewalk next to it that is as high as an ant," said Ben R. Oppenheimer, lead author of the new study and associate curator and chair of the Astrophysics Department at the American Museum of Natural History, N.Y., N.Y.

Their results revealed that all four planets, though nearly the same in temperature, have different compositions. Some, unexpectedly, do not have methane in them, and there may be hints of ammonia or other compounds that would also be surprising. Further theoretical modeling will help to understand the chemistry of these planets.

Meanwhile, the quest to obtain more and better spectra of exoplanets continues. Other researchers have used the Keck telescope and the Large Binocular Telescope near Tucson, Ariz., to study the emission of individual planets in the HR8799 system. In addition to the HR 8799 system, only two others have yielded images of exoplanets. The next step is to find more planets ripe for giving up their chemical secrets. Several ground-based telescopes are being prepared for the hunt, including Keck, Gemini, Palomar and Japan's Subaru Telescope on Mauna Kea, Hawaii.

Ideally, the researchers want to find young planets that still have enough heat left over from their formation, and thus more infrared light for the spectrographs to see. They also want to find planets located far from their stars, and out of the blinding starlight. NASA's infrared Spitzer and Wide-field Infrared Survey Explorer (WISE) missions, and its ultraviolet Galaxy Evolution Explorer, now led by the California Institute of Technology, Pasadena, have helped identify candidate young stars that may host planets meeting these criteria.

"We're looking for super-Jupiter planets located faraway from their star," said Vasisht. "As our technique develops, we hope to be able to acquire molecular compositions of smaller, and slightly older, gas planets."

Still lower-mass planets, down to the size of Saturn, will be targets for imaging studies by the James Webb Space Telescope.

"Rocky Earth-like planets are too small and close to their stars for the current technology, or even for James Webb to detect. The feat of cracking the chemical compositions of true Earth analogs will come from a future space mission such as the proposed Terrestrial Planet Finder," said Charles Beichman, a co-author of the P1640 result and executive director of NASA's Exoplanet Science Institute at Caltech.

Though the larger, gas planets are not hospitable to life, the current studies are teaching astronomers how the smaller, rocky ones form.

"The outer giant planets dictate the fate of rocky ones like Earth. Giant planets can migrate in toward a star, and in the process, tug the smaller, rocky planets around or even kick them out of the system. We're looking at hot Jupiters before they migrate in, and hope to understand more about how and when they might influence the destiny of the rocky, inner planets," said Vasisht.

NASA's Exoplanet Science Institute manages time allocation on the Keck telescope for NASA. JPL manages NASA's Exoplanet Exploration program office. Caltech manages JPL for NASA.

A visualization from the American Museum of Natural History showing where the HR 8799 system is in relation to our solar system is online at http://www.youtube.com/watch?v=yDNAk0bwLrU .

More information about exoplanets and NASA's planet-finding program is at http://planetquest.jpl.nasa.gov .

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Tuesday, May 7, 2013

Educators Invited to Attend Two-Day STEM Service-Learning Institute

Educator Workshop May 7, 2013

This is a feature from the NASA/JPL Education Office.

Southern California STEM Service-Learning Institute: Earth and Beyond.

Date: June 11-12, 2013, 8 a.m. - 4:45 p.m.

Target audience: Teachers, administrators and community leaders who work with grades 4-12 and have an interest in enhancing STEM education, environmental education and service-learning programs. This includes alternative education, AVID, gifted and talented and after school programs.

Location:
Day 1: June 11
Crafton Hills College
Performing Arts Center
11711 San Canyon Rd.
Yucaipa, Calif. 92399

Day 2: June 12
Planes of Fame Air Museum
7000 Merrill Ave.
Chino, Calif. 91710

* These facilities are accessible to individuals with disabilities

Overview: Explore science, technology, engineering and mathematics and their relationship to Earth and space exploration as part of an engaging two-day institute designed to promote and support STEM education programs. The institute will explore such topics as recruitment and retention of underrepresented youth, project management, building and sustaining school and community partnerships, gender equity, green careers, environmental education, and evaluation and assessment. California Common Core and connections to "A Framework for K-12 Science Education" will also be covered. Keynote speakers include former astronaut Ellen Ochoa, director of the Johnson Space Center; David Seidel, deputy education director and manager of STEM elementary and secondary education at NASA's Jet Propulsion Laboratory; and Angela Mason, director of Community Gardening and Green Youth Farm at the Chicago Botanic Garden.

The cost to attend is $50 per person and includes educational materials and some meals. (Limited scholarships are available to cover registration costs.) Visit http://oms.sbcss.k12.ca.us/31-68981 to sign up today! The deadline to register is June 3. Space is limited to 200 participants. Questions? Contact Rasamee Jaycox at 909-777-0879 or rasamee_jaycox@sbcss.k12.ca.us.

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Reminder: Upcoming NASA/JPL Educator Workshop on Engineering Careers

Educator Workshop May 7, 2013

This is a feature from the NASA/JPL Education Office.

Engineering Careers

Date: Saturday, May 11, 2013, 10 a.m. - 12:30 p.m.

Target audience: Suggested for educators for grades 5 and above, but all K-12 formal and informal educators are welcome

Location: NASA/JPL Educator Resource Center, Pomona, Calif.

Overview: Open students' eyes to a world of exciting careers in engineering and technology that they probably never even knew existed! This workshop gives educators the tools and tips to engage students about careers in engineering as well as a host of other possibilities. Group work turns into a whole class conversation!

The workshop will be held at the JPL Educator Resource Center in Pomona, Calif. To sign up, please call the Resource Center at 909-397-4420.

For more information and directions, visit: http://www.jpl.nasa.gov/education/index.cfm?page=115

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Monday, May 6, 2013

NASA's Spitzer Puts Planets in a Petri Dish

MEDIA RELATIONS OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109 PHONE 818-354-5011
http://www.jpl.nasa.gov

Whitney Clavin 818-354-4673
Jet Propulsion Laboratory, Pasadena, Calif.
whitney.clavin@jpl.nasa.gov

News feature: 2013-155 May 6, 2013

NASA's Spitzer Puts Planets in a Petri Dish

The full version of this story with accompanying images is at:
http://www.jpl.nasa.gov/news/news.php?release=2013-155&cid=release_2013-155

Our galaxy is teeming with a wild variety of planets. In addition to our solar system's eight near-and-dear planets, there are more than 800 so-called exoplanets known to circle stars beyond our sun. One of the first "species" of exoplanets to be discovered is the hot Jupiters, also known as roasters. These are gas giants like Jupiters, but they orbit closely to their stars, blistering under the heat.

Thanks to NASA's Spitzer Space Telescope, researchers are beginning to dissect this exotic class of planets, revealing raging winds and other aspects of their turbulent nature. A twist to come out of the recent research is the planets' wide range of climates. Some are covered with a haze, while others are clear. Their temperature profiles, chemistries and densities differ as well.

"The hot Jupiters are beasts to handle. They are not fitting neatly into our models and are more diverse than we thought," said Nikole Lewis of the Massachusetts Institute of Technology, Cambridge, lead author of a new Spitzer paper in the Astrophysical Journal examining one such hot Jupiter called HAT-P-2b. "We are just starting to put together the puzzle pieces of what's happening with these planets, and we still don't know what the final picture will be."

The very first exoplanet discovered around a sun-like star was, in fact, a hot Jupiter, called 51 Pegasi b. It was detected in 1995 by Swiss astronomers using the radial velocity technique, which measures the wobble of a star caused by the tug of a planet. Because hot Jupiters are heavy and whip quickly around their stars quickly, they are the easiest to find using this strategy. Dozens of hot Jupiter discoveries soon followed. At first, researchers thought they might represent a more common configuration for other planetary systems in our galaxy beyond our own solar system. But new research, including that from NASA's Kepler space telescope, has shown that they are relatively rare.

In 2005, scientists were thrilled when Spitzer became the first telescope to detect light emitted by an exoplanet. Spitzer monitored the infrared light coming from a star and its planet -- a hot Jupiter -- as the planet disappeared behind the star in an event known as a secondary eclipse. Once again, this technique works best for hot Jupiters, because they are the biggest and hottest planets.

In addition to watching hot Jupiters slip behind their stars, researchers also use Spitzer to monitor the planets as they orbit all the way around a star. This allows them to create global climate maps, revealing how the planets' atmospheres vary from their hot, sun-facing sides to their cooler, night sides, due in part to fierce winds. (Hot Jupiters are frequently tidally locked, with one side always facing the star, just as our moon is locked to Earth.)

Since that first observation, Spitzer has probed the atmospheres of dozens of hot Jupiters, and some even smaller planets, uncovering clues about their composition and climate.

"When Spitzer launched in 2003, we had no idea it would prove to be a giant in the field of exoplanet science," said Michael Werner, the Spitzer project scientist at NASA's Jet Propulsion Laboratory, Pasadena, Calif. "Now, we're moving farther into the field of comparative planetary science, where we can look at these objects as a class, and not just as individuals."

In the new study, Lewis and colleagues made the longest Spitzer observation yet of a hot Jupiter. The infrared telescope stared at the HAT-P-2 system continuously for six days, watching it cross in front of its star, slip behind, and then reappear on the other side, making a full orbit. What makes the observation even more exciting to scientists is that the planet has a comet-like eccentric orbit, carrying it as close as 2.8 million miles (4.5 million kilometers) to the star and out to as far as 9.3 million miles (15 million kilometers). For reference, Mercury is about 28.5 million miles from our sun.

"It's as if nature has given us a perfect lab experiment with this system," said Heather Knutson, a co-author of the new paper at the California Institute of Technology, Pasadena, Calif. "Because the planet's distance to the sun changes, we can watch how fast it takes to heat up and cool down. It's as though we're turning the heat knob up on our planet and watching what happens." Knutson led the first team to create a global "weather" map of a hot Jupiter, called HD 189733 b, in 2007.

The new HAT-P-2b study is also one of the first to use multiple wavelengths of infrared light, instead of just one, while watching a full orbit of a hot Jupiter. This enables the scientists to peer down into different layers of the planet.

The results reveal that HAT-P-2b takes about a day to heat up as it approaches the hottest part of its orbit, and four to five days to cool down as it swings away. It also exhibits a temperature inversion -- a hotter, upper layer of gas -- when it is closest to its star. What's more, the carbon chemistry of the planet seems to be behaving in unexpected ways, which the astronomers are still trying to understand.

"These planets are much hotter and more dynamic than our own Jupiter, which is sluggish by comparison. Strong winds are churning material up from below, and the chemistry is always changing," said Lewis.

Another challenge in understanding hot Jupiters lies in parsing through the data. Lewis said her team's six-day Spitzer observation left them with 2 million data points to map out while carefully removing instrument noise.

"Theories are being shot down right and left," said Nick Cowan of Northwestern University, Evanston, Ill., a co-author of the HAT-P-2b study. "Right now, it's like the wild, wild west."

NASA's Jet Propulsion Laboratory, Pasadena, Calif., manages the Spitzer Space Telescope mission for NASA's Science Mission Directorate, Washington. Science operations are conducted at the Spitzer Science Center at the California Institute of Technology in Pasadena. Data are archived at the Infrared Science Archive housed at the Infrared Processing and Analysis Center at Caltech. Caltech manages JPL for NASA. For more information about Spitzer, visit http://spitzer.caltech.edu and http://www.nasa.gov/spitzer .

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Thursday, May 2, 2013

NASA Opens New Era in Measuring Western U.S. Snowpack

MEDIA RELATIONS OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109 PHONE 818-354-5011
http://www.jpl.nasa.gov

Alan Buis 818-354-0474
Jet Propulsion Laboratory, Pasadena, Calif.
Alan.buis@jpl.nasa.gov

Steve Cole 202-358-0918
NASA Headquarters, Washington
Stephen.e.cole@nasa.gov

Elizabeth Scott 916-712-3904
California Department of Water Resources, Sacramento
Elizabeth.Scott@water.ca.gov

News release: 2013-154 May 2, 2013

NASA Opens New Era in Measuring Western U.S. Snowpack

The full version of this story with accompanying images is at:
http://www.jpl.nasa.gov/news/news.php?release=2013-154&cid=release_2013-154

PASADENA, Calif. – A new NASA airborne mission has created the first maps of the entire snowpack of two major mountain watersheds in California and Colorado, producing the most accurate measurements to date of how much water they hold.

The data from NASA's Airborne Snow Observatory mission will be used to estimate how much water will flow out of the basins when the snow melts. The data-gathering technology could improve water management for 1.5 billion people worldwide who rely on snowmelt for their water supply.

"The Airborne Snow Observatory is on the cutting edge of snow remote-sensing science," said Jared Entin, a program manager in the Earth Science Division at NASA Headquarters in Washington. "Decision makers like power companies and water managers now are receiving these data, which may have immediate economic benefits."

The mission is a collaboration between NASA's Jet Propulsion Laboratory, Pasadena, Calif., and the California Department of Water Resources in Sacramento.

A Twin Otter aircraft carrying NASA's Airborne Snow Observatory began a three-year demonstration mission in April that includes weekly flights over the Tuolumne River Basin in California's Sierra Nevada and monthly flights over Colorado's Uncompahgre River Basin. The flights will run through the end of the snowmelt season, which typically occurs in July. The Tuolumne watershed and its Hetch Hetchy Reservoir are the primary water supply for San Francisco. The Uncompahgre watershed is part of the Upper Colorado River Basin that supplies water to much of the western United States.

The mission's principal investigator, Tom Painter of JPL, said the mission fills a critical need in an increasingly thirsty world, initially focusing on the western United States, where snowmelt provides more than 75 percent of the total freshwater supply.

"Changes in and pressure on snowmelt-dependent water systems are motivating water managers, governments and others to improve understanding of snow and its melt," Painter said. "The western United States and other regions face significant water resource challenges because of population growth and faster melt and runoff of snowpacks caused by climate change. NASA's Airborne Snow Observatory combines the best available technologies to provide precise, timely information for assessing snowpack volume and melt."

The observatory's two instruments measure two properties most critical to understanding snowmelt runoff and timing. Those two properties had been mostly unmeasured until now.

A scanning lidar system from the Canadian firm Optech Inc. of Vaughan, Ontario, measures snow depth with lasers to determine the first property, snow water equivalent. Snow water equivalent represents the amount of water in the snow on a mountain. It is used to calculate the amount of water that will run off.

An imaging spectrometer built by another Canadian concern, ITRES of Calgary, Alberta, measures the second property, snow albedo. Snow albedo represents the amount of sunlight reflected and absorbed by snow. Snow albedo controls the speed of snowmelt and timing of its runoff.

By combining these data, scientists can tell how changes in the absorption of sunlight cause snowmelt rates to increase.

The Airborne Snow Observatory flies at an altitude of 17,500 to 22,000 feet (5,334 to 6,705 meters) to produce frequent maps that scientists can use to monitor changes over time. It can calculate snow depth to within about 4 inches (10 centimeters) and snow water equivalent to within five percent. Data are processed on the ground and made available to participating water managers within 24 hours.

Before now, Sierra Nevada snow water equivalent estimates have been extrapolated from monthly manual ground snow surveys conducted from January through April. These survey sites are sparsely located, primarily in lower to middle elevations that melt free of snow each spring, while snow remains at higher elevations. Water managers use these survey data to forecast annual water supplies. The information affects decisions by local water districts, agricultural interests and others. The sparse sampling can lead to large errors. In contrast, the NASA observatory can map all the snow throughout the entire snowmelt season.

"The Airborne Snow Observatory is providing California water managers the first near-real-time, comprehensive determination of basin-wide snow water equivalent," said Frank Gehrke, mission co-investigator and chief of the California Cooperative Snow Surveys Program for the California Department of Water Resources. "Integrated into models, these data will enhance the state's reservoir operations, permitting more efficient flood control, water supply management and hydroelectric power generation."
Gehrke said the state will continue to conduct manual surveys while it incorporates the Airborne Snow Observatory data. "The snow surveys are relatively inexpensive, help validate observatory data and provide snow density measurements that are key to reducing errors in estimating snow water equivalent," he said.

Painter plans to expand the airborne mapping program to the entire Upper Colorado River Basin and Sierra Nevada.

"We believe this is the future of water management in the western United States," he said.

For more information about the Airborne Snow Observatory, visit: http://aso.jpl.nasa.gov/ . For more on NASA's Airborne Science program, visit: http://airbornescience.nasa.gov .

The California Institute of Technology in Pasadena manages JPL for NASA.

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Wednesday, May 1, 2013

Mars Rover Social Media, JPL Website Win Webby Awards

MEDIA RELATIONS OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIFORNIA 91109 PHONE 818-354-5011
http://www.jpl.nasa.gov

Stephanie L. Smith 818-393-5464
Jet Propulsion Laboratory, Pasadena, Calif.
slsmith@jpl.nasa.gov

News feature: 2013-152 May 1, 2013

Mars Rover Social Media, JPL Website Win Webby Awards

The full version of this story with accompanying images is at:
http://www.jpl.nasa.gov/news/news.php?release=2013-152&cid=release_2013-152

PASADENA, Calif. — NASA's Curiosity Mars rover social media and Solar System Exploration site have won four Webby Awards, the leading international honor for technical achievement and creativity online.

Curiosity social media won both the judges' Webby Award and People's Voice for "Overall Social Presence." The Solar System Exploration website won the People's Voice in two categories: government and science.

The International Academy of Digital Arts and Sciences presents the Webby Awards. This year, the academy added categories for work in social Web; Curiosity's wins are two of the first in these categories. The Solar System Exploration site win in government keeps up a five-year streak for NASA in that category.

"NASA's Solar System Exploration site is the leading source of planet information, attracting 8 million unique visitors per year," said Alice Wessen, the manager of the website from NASA's Jet Propulsion Laboratory, Pasadena, Calif. "Many of our 30 million annual page views are from students seeking information on the planets for their schoolwork. We even have a section dedicated to homework help."

Visiting a NASA website is just one way to get information from the agency.

"We also engage the public in the social networks where they spend the most time," said Veronica McGregor, JPL's news manager and lead for the Curiosity social media campaign. "Through Facebook, Twitter and Reddit, we speak with millions. The public was invited to watch the rover's construction, launch, landing and news briefings live on Ustream.tv, and participate in real-time chats with each other and mission experts.

Other NASA sites commended by the Webby Awards this year include NASA's main website, http://www.nasa.gov , an honoree in government; JPL's Space Images, http://www.jpl.nasa.gov/spaceimages/ , a nominee in government; and NASA's "Eyes on the Earth," http://eyes.jpl.nasa.gov/earth/ , an honoree in science.

Members of The International Academy of Digital Arts and Sciences select winners for the Webby Awards. A popular vote conducted online determines the winners of the People's Voice Awards.

Winners were announced online on April 30. Trophies will be awarded on May 21 at a ceremony in New York.

For more information about the Webby Awards, including the full list of winners, nominees and honorees, visit: http://www.webbyawards.com/ .

JPL, a division of the California Institute of Technology in Pasadena, manages the Mars Science Laboratory and its Curiosity rover for NASA's Science Mission Directorate, Washington.

Interact with the Curiosity rover on Facebook and Twitter at:
http://facebook.com/marscuriosity and http://twitter.com/marscuriosity .

Find Solar System Exploration at http://solarsystem.nasa.gov , http://twitter.com/NASASolarSystem and https://facebook.com/oursolarssytem .
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