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Barnstorming Linne Crater February 5, 2013

Posted by jtintle in Planets.
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Description:

This flyover was generated from 3D model of Linne Crater with the image draped on top. The 3D model uses the DTM derived from LROC NAC stereo images.

Credit:

NASA/GSFC/Arizona State University

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PIA13954: NASA Spacecraft Images Some of Earth’s Newest “Real Estate” January 24, 2012

Posted by jtintle in Planets, Space Fotos.
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In December, 2011, NASA's Terra spacecraft captured this image of a new volcanic island forming in the Red Sea. This region is part of the Red Sea Rift where the African and Arabian tectonic plates are pulling apart.
Description:

In December 2011, a new volcanic island began forming in the Red Sea, accompanied by lava fountains reaching up to 30 meters (95 feet) tall. By Jan. 14, 2012, when the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) instrument on NASA’s Terra spacecraft captured this image (left), the island clearly showed a central crater, similar to the surrounding islands, and was well above the wave height. The right image is from Google Earth and shows the area before the creation of this new island. This region is part of the Red Sea Rift where the African and Arabian tectonic plates are pulling apart. The image covers an area of 5.6 by 9.3 kilometers (3.5 by 5.8 miles), and is located at 15.1 degrees north latitude, 42.1 degrees east longitude.

With its 14 spectral bands from the visible to the thermal infrared wavelength region and its high spatial resolution of 15 to 90 meters (about 50 to 300 feet), ASTER images Earth to map and monitor the changing surface of our planet. ASTER is one of five Earth-observing instruments launched Dec. 18, 1999, on Terra. The instrument was built by Japan’s Ministry of Economy, Trade and Industry. A joint U.S./Japan science team is responsible for validation and calibration of the instrument and data products.

The broad spectral coverage and high spectral resolution of ASTER provides scientists in numerous disciplines with critical information for surface mapping and monitoring of dynamic conditions and temporal change. Example applications are: monitoring glacial advances and retreats; monitoring potentially active volcanoes; identifying crop stress; determining cloud morphology and physical properties; wetlands evaluation; thermal pollution monitoring; coral reef degradation; surface temperature mapping of soils and geology; and measuring surface heat balance.

The U.S. science team is located at NASA’s Jet Propulsion Laboratory, Pasadena, Calif. The Terra mission is part of NASA’s Science Mission Directorate, Washington, D.C.

More information about ASTER is available at http://asterweb.jpl.nasa.gov/.

Image Credit:

NASA/GSFC/METI/ERSDAC/JAROS, and U.S./Japan ASTER Science Team

Image Addition Date:

2012-01-20

Cloud Streets over the Bering Sea January 11, 2012

Posted by jtintle in Planets, Space Fotos.
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Cloud Streets over the Bering Sea
acquired January 4, 2012 download large image (4 MB, JPEG, 5501×2358)

Explanation:

Most of us prefer our winter roads free of ice, but one kind of road depends on it: a cloud street. Such streets formed over the Bering Sea in early January 2012, thanks to snow and ice blanketing the nearby land, and sea ice clinging to the shore. The Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra satellite captured this natural-color image of the cloud streets on January 4, 2012.

Air blowing over frigid ice then warmer ocean water can lead to the development of parallel cylinders of spinning air. Above the upward cycle of these cylinders (rising air), small clouds form. Along the downward cycle (descending air), skies are clear. The resulting cloud formations resemble streets.

This image shows that some of the cloud streets begin over the sea ice, but most of the clouds hover over the open ocean water. These streets are not perfectly straight, but curve to the east and west after passing over the sea ice. By lining up along the prevailing wind direction, the tiny clouds comprising the streets indicate the wind patterns around the time of their formation.

Credit:

NASA images courtesy LANCE/EOSDIS MODIS Rapid Response Team at NASA GSFC. Caption by Michon Scott.

Instrument: Terra – MODIS

Frozen Franz Josef Land January 8, 2012

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Frozen Franz Josef Land

Description:

Located just 600 miles (970 kilometers) from the North Pole, Franz Josef Land is perpetually coated with ice. Glaciers cover roughly 85 percent of the archipelago’s land masses, and sea ice floats in the channels between islands even in the summertime.

The Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) on NASA’s Terra satellite observed the islands of central Franz Josef Land on August 16 and 19, 2011. (Another sensor on Terra captured a wider view on August 17, 2011.)

The image above was made from a combination of visible and near-infrared wavelengths, and ice appears in shades of white and pale blue. The amount of sea ice filling the channels between the islands of Franz Josef Land varies from summer to summer. Captured toward the end of the Northern Hemisphere melt season, this shot shows a modest amount of sea ice on the ocean surface. Some of the ice has accumulated in bays like the one near northeastern Zieger Island.

Most of the ice in this scene is anchored to land, as large glaciers blanket the islands. Yet today’s glaciers are tiny compared to the ice sheet that dominated the region about 20,000 years ago. Studies of Franz Josef Land have actually contributed to a larger understanding of when that massive ice sheet began its slow retreat. Raised beaches, which preserve evidence of land rising as the crushing weight of overlying glaciers eases (known as isostatic rebound), were first recognized on the islands in the late nineteenth century. Researchers estimate that the giant ice sheet had retreated by about 10,000 years ago.

References

Formana, S.L., Lubinski, D.J., Ingólfsson, Ó., Zeeberg, J.J., Snyder, J.A., Siegert, M.J., Matishov, G.G. (2004). A review of postglacial emergence on Svalbard, Franz Josef Land and Novaya Zemlya, northern Eurasia. Quaternary Science Reviews, 23, 1391–1434.

Credit:

NASA, Jesse Allen, GSFC/METI/ERSDAC/JAROS, ASTER Science Team, Michon Scott, Walt Meier and Ted Scambos, National Snow and Ice Data Center

Instrument:

Terra – ASTER

Download:

large image (3 MB, JPEG, 4531×6005)

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