Clarksville, TN Online: News, Opinion, Arts & Entertainment.


Topic: NASA GRACE-FO Satellites

NASA study brings new insights into causes of Sea Level Rise Since 1900

 

NASA - National Aeronautics and Space AdministrationPasadena, CA – To make better predictions about the future impacts of sea level rise, new techniques are being developed to fill gaps in the historic record of sea level measurements.

We know the factors that play a role in sea level rise: Melting glaciers and ice sheets add water to the seas, and warmer temperatures cause water to expand.

Other factors are known to slow the rise, such as dams impounding water on the land, stymying its flow into the sea.

This aerial photograph shows fast-moving meltwater rivers flowing across the Greenland Ice Sheet, a region that, combined with Antarctic meltwater and thermal expansion, accounts for two-thirds of observed global mean sea level rise. (NASA)

This aerial photograph shows fast-moving meltwater rivers flowing across the Greenland Ice Sheet, a region that, combined with Antarctic meltwater and thermal expansion, accounts for two-thirds of observed global mean sea level rise. (NASA)

«Read the rest of this article»

Sections: Technology | No Comments
 

NASA Study shows Record Loss of Greenland Ice in 2019

 

NASA - National Aeronautics and Space AdministrationPasadena, CA – NASA says Greenland has set a new record for ice loss in 2019, shedding the most mass from its giant ice sheet in any year since at least 1948.

The large loss – 532 billion tons -is a stark reversal of the more moderate rate of melt seen in the previous two years. And it exceeds Greenland’s previous record of 464 billion tons, set in 2012. The record melt will likely raise average global sea level by 1.5 millimeters.

Using a hypothetical comparison, all the water combined would cover the entire state of California in more than 4 feet (1.2 meters) of water.

An iceberg in Disko Bay, near Ilulissat, Greenland. The massive Greenland ice sheet shed a record amount of ice in 2019, ending a brief period of more moderate ice loss. (NASA/Saskia Madlener)

An iceberg in Disko Bay, near Ilulissat, Greenland. The massive Greenland ice sheet shed a record amount of ice in 2019, ending a brief period of more moderate ice loss. (NASA/Saskia Madlener)

«Read the rest of this article»

Sections: Technology | No Comments
 

NASA reports Arctic Regions Ice Melts speed up Freshwater Depletion

 

NASA - National Aeronautics and Space AdministrationPasadena, CA – Seven of the regions that dominate global ice mass losses are melting at an accelerated rate, a new study shows, and the quickened melt rate is depleting freshwater resources that millions of people depend on.

The impact of melting ice in Greenland and Antarctica on the world’s oceans is well documented. But the largest contributors to sea level rise in the 20th century were melting ice caps and glaciers located in seven other regions: Alaska, the Canadian Arctic Archipelago, the Southern Andes, High Mountain Asia, the Russian Arctic, Iceland and the Norwegian archipelago Svalbard. The five Arctic regions accounted for the greatest share of ice loss.

A small glacier in the Arctic region of Norwegian archipelago Svalbard, as photographed by NASA's Airborne Tropical Tropopause Experiment (ATTREX). This is one of the seven regions where ice loss is accelerating, causing the depletion of freshwater resources. (NASA/John Sonntag)

A small glacier in the Arctic region of Norwegian archipelago Svalbard, as photographed by NASA’s Airborne Tropical Tropopause Experiment (ATTREX). This is one of the seven regions where ice loss is accelerating, causing the depletion of freshwater resources. (NASA/John Sonntag)

«Read the rest of this article»

Sections: Technology | No Comments
 


NASA keeps tabs on Rising Seas, Flooding Mitigation, Disaster Response

 

NASA - National Aeronautics and Space AdministrationPasadena, CA – Greenland and coastal Louisiana may not seem to have a lot in common. An autonomous territory of Denmark, Greenland is covered in snow most of the year and is home to about 56,000 people. On the other hand, more than 2 million people call coastal Louisiana home and the region rarely sees snow.

But their economies, though 3,400 miles (5,400 kilometers) apart, share a dependence on the sea. The majority of Greenland’s residents rely on the territory’s robust Arctic fishing industry. And in Louisiana, the coasts, ports and wetlands provide the basis for everything from shipping to fishing to tourism. As a result, both locales and the people who live in them are linked by a common environmental thread: melting ice and consequent sea level rise.

The Mississippi River Delta contains vast areas of marshes, swamps and barrier islands - important for wildlife and as protective buffers against storms and hurricanes. Rapid land subsidence due to sediment compaction and dewatering increases the rate of submergence in this system. (K.L. McKee / U.S. Geological Survey)

The Mississippi River Delta contains vast areas of marshes, swamps and barrier islands – important for wildlife and as protective buffers against storms and hurricanes. Rapid land subsidence due to sediment compaction and dewatering increases the rate of submergence in this system. (K.L. McKee / U.S. Geological Survey)

«Read the rest of this article»

Sections: Technology | No Comments
 

NASA Scientists use GRACE, GRACE-FO Satellite Data to examine Ice Loss in Greenland, Antarctica

 

NASA - National Aeronautics and Space AdministrationPasadena, CA – According to NASA, during the exceptionally warm Arctic summer of 2019, Greenland lost 600 billion tons of ice – enough to raise global sea levels by nearly a tenth of an inch (2.2 millimeters) in just two months, a new study shows.

Led by scientists at NASA’s Jet Propulsion Laboratory and the University of California, Irvine, the study also concludes that Antarctica continues to lose mass, particularly in the Amundsen Sea Embayment and the Antarctic Peninsula on the western part of the continent; however, those losses have been partially offset by gains from increased snowfall in the northeast.

Greenland's Steenstrup Glacier, with the midmorning sun glinting off the Denmark Strait in the background. The image was taken during a NASA IceBridge airborne survey of the region in 2016. (NASA/Operation IceBridge)

Greenland’s Steenstrup Glacier, with the midmorning sun glinting off the Denmark Strait in the background. The image was taken during a NASA IceBridge airborne survey of the region in 2016. (NASA/Operation IceBridge)

«Read the rest of this article»

Sections: Technology | No Comments
 

NASA’s Grace satellites data reveals how Water moves on Earth

 

NASA - National Aeronautics and Space AdministrationWashington, D.C. – NASA says when you hear news about an aquifer in California that is getting depleted, ice loss from Greenland or Antarctica,  or a new explanation for a wobble in Earth’s rotation, you might not realize that all these findings may rely on data from one single mission: the U.S.-German Gravity Recovery and Climate Experiment (GRACE).

GRACE data, collected from 2002 to 2017 while the mission was active, are still being used to improve our understanding of water in motion and its sometimes surprising effects on our planet.

Illustration of the twin GRACE satellites. (NASA/JPL-Caltech)

Illustration of the twin GRACE satellites. (NASA/JPL-Caltech)

«Read the rest of this article»

Sections: Technology | No Comments
 

NASA’s GRACE-FO mission switches to backup system, resumes collecting data

 

Written by Carol Rasmussen
NASA’s Earth Science News Team

NASA - National Aeronautics and Space AdministrationWashington, D.C. – The Gravity Recovery and Climate Experiment Follow-On (GRACE-FO) mission has resumed collecting science-quality data and planned in-orbit checks after successfully completing a switchover to a backup system in the microwave instrument (MWI) on one of the mission’s twin spacecraft.

The in-orbit checks include calibrations and other system tests, and are expected to continue until January, when GRACE-FO will enter the science phase of its mission.

Illustration of the twin GRACE Follow-On Satellites. (NASA/JPL-Caltech)

Illustration of the twin GRACE Follow-On Satellites. (NASA/JPL-Caltech)

«Read the rest of this article»

Sections: Technology | No Comments
 


NASA’s GRACE-FO Satellite to Switch to Backup Instrument Processing Unit

 

NASA’s Jet Propulsion Laboratory

NASA - National Aeronautics and Space AdministrationPasadena, CA – The Gravity Recovery and Climate Experiment Follow-On (GRACE-FO) mission team plans to switch to a backup system in the Microwave Instrument (MWI) on one of the twin spacecraft this month. Following the switch-over, GRACE-FO is expected to quickly resume science data collection.

A month after launching this past May, GRACE-FO produced its first preliminary gravity field map. The mission has not acquired science data since mid-July due to an anomaly with a component of the Microwave Instrument on one of the GRACE-FO spacecraft. The mission team is completing its investigation into the cause of the anomaly.

Artist's illustration of the NASA/German Research Centre for Geosciences Gravity Recovery and Climate Experiment Follow-On (GRACE-FO) mission, which will track changes in the distribution of Earth's mass, providing insights into climate, Earth system processes and the impacts of some human activities. (NASA/JPL-Caltech)

Artist’s illustration of the NASA/German Research Centre for Geosciences Gravity Recovery and Climate Experiment Follow-On (GRACE-FO) mission, which will track changes in the distribution of Earth’s mass, providing insights into climate, Earth system processes and the impacts of some human activities. (NASA/JPL-Caltech)

«Read the rest of this article»

Sections: Technology | No Comments
 

NASA’s GRACE-FO satellites switch on Laser Ranging Interferometer

 

NASA’s Jet Propulsion Laboratory

NASA - National Aeronautics and Space AdministrationPasadena, CA – The laser ranging interferometer (LRI) instrument has been successfully switched on aboard the recently launched twin U.S./German Gravity Recovery and Climate Experiment Follow-On (GRACE-FO) satellites.

The LRI, which is being flown as a technology demonstration, has made its first measurements in parallel with GRACE-FO’s main microwave ranging instrument, and initial comparisons of the data from the two types of instruments show that they agree as expected.

Artist's rendering of the twin spacecraft of the Gravity Recovery and Climate Experiment Follow-On (GRACE-FO) mission, scheduled to launch in May. GRACE-FO will track the evolution of Earth's water cycle by monitoring changes in the distribution of mass on Earth. (NASA/JPL-Caltech)

Artist’s rendering of the twin spacecraft of the Gravity Recovery and Climate Experiment Follow-On (GRACE-FO) mission, scheduled to launch in May. GRACE-FO will track the evolution of Earth’s water cycle by monitoring changes in the distribution of mass on Earth. (NASA/JPL-Caltech)

«Read the rest of this article»

Sections: Technology | No Comments
 

NASA’s GRACE-FO Satellites complete first mission

 

NASA’s Jet Propulsion Laboratory

NASA - National Aeronautics and Space AdministrationPasadena, CA – Less than three weeks after launch, the Gravity Recovery and Climate Experiment Follow-On (GRACE-FO) mission has successfully completed its first mission phase and demonstrated the performance of the precise microwave ranging system that enables its unique measurements of how mass migrates around our planet.

The twin spacecraft launched May 22nd from California’s Vandenberg Air Force Base. NASA and German Research Centre for Geosciences (GFZ) engineers and mission controllers at the German Space Operations Center in Oberpfaffenhofen then spent the first few days completing the mission’s launch and early operations phase and moving into an 85-day in-orbit checkout period. Science operations will begin when that period has been successfully completed.

Along the satellites' ground track (top), the inter-spacecraft distance between them changes as the mass distribution underneath (i.e., from mountains, etc.) varies. The small changes measured by the Microwave Ranging Instrument (middle) agree well with topographic features along the orbit (bottom). (NASA/JPL-Caltech/GFZ)

Along the satellites’ ground track (top), the inter-spacecraft distance between them changes as the mass distribution underneath (i.e., from mountains, etc.) varies. The small changes measured by the Microwave Ranging Instrument (middle) agree well with topographic features along the orbit (bottom). (NASA/JPL-Caltech/GFZ)

«Read the rest of this article»

Sections: Technology | No Comments
 



  • Visit Us On FacebookVisit Us On TwitterVisit Us On PinterestVisit Us On YoutubeCheck Our FeedVisit Us On Instagram
  • Personal Controls

    Archives