Tag: satellites

Filter By:

Filter

Tsunami detection network uses navigation systems on ships

Researchers, funded by NOAA, are partnering with Matson, Maersk Line and the World Ocean Council to equip 10 ships with real-time geodetic GPS systems and satellite communications. The newly built pilot network of GPS-equipped ships enables each vessel to act as an open-ocean tide gauge. Data from these new tsunami sensors are streamed, via satellite, to a land-based data center where they are processed and analyzed for tsunami signals.

Read more

Ocean currents to be tracked from space

 A new method of tracking ocean currents from space has been developed by NASA scientists and verified using data from the National Oceanography Centre (NOC).The importance of these ocean currents as a driving force in the global climatic system is increasingly being recognised. By helping to monitor changes in currents, this new method could help improve long-term forecasts. 

Researchers at NASA have developed a means of measuring the flow rate of water masses in deep ocean currents by detecting the tiny changes they cause to Earth’s gravity field. A study, published in the journal of Geophysical Research letters, reveals how gravitational data from the twin satellites of NASA's Gravity Recovery and Climate Experiment (GRACE) mission, has been used to calculate the flow rate of a current system in the Atlantic. 

This system is known as the Atlantic Meridional Overturning Circulation (AMOC). It is responsible for the transfer of a great deal of heat and nutrients from the tropics to North West Europe, contributing to our relatively mild climate. 
 
“In principle, you’d think you’d have to measure every ten yards or so across the ocean to know the whole flow. In fact if you can measure the farthest eastern and western points very accurately ...

Read more

Cool summer of 2013 boosted Arctic sea ice

  The volume of Arctic sea ice increased by a third after the summer of 2013 as the unusually cool air temperatures prevented the ice from melting, according to UCL and University of Leeds scientists. This suggests that the ice pack in the Northern hemisphere is more sensitive to changes in summer melting than it is to winter cooling, a finding which will help researchers to predict future changes in its volume. The study, published in Nature Geoscience and funded by the Natural Environment Research Council (NERC), used 88 million measurements of sea ice thickness recorded by the European Space Agency's CryoSat-2 mission between 2010 and 2014. It showed that there was a 14% reduction in the volume of summertime Arctic sea ice between 2010 and 2012, but the volume of ice jumped by 41% in 2013 (relative to the previous year), when the summer was 5% cooler than the previous year. Lead author and PhD student, Rachel Tilling from the Centre for Polar Observation and Modelling (CPOM), UCL Earth & Planetary Sciences, said: "The summer of 2013 was much cooler than recent years with temperatures typical of those seen in the late 1990s. This allowed thick sea ice to persist ...

Read more

NASA satellite data helps protect endangered whales

(Image Credit: Craig Hayslip/Oregon State University) Bruce Mate has been tagging blue whales since 1979. After 35 years, he has yet to lose his sense of wonder. "The term 'awesome' is almost trite nowadays, people use it a lot. But for blue whales it's an appropriate term," said Mate, director of the Marine Mammal Institute at Oregon State University. "They're the biggest animal that's ever lived on Earth, over 100 feet long, over 100 tons in weight, and their color is a sort of iridescent blue. When you see them rising to the surface you start seeing this glimmer that keeps getting bigger and bigger. They're just amazing," he said. A new online tool funded by NASA that helps protect this endangered whales is set to be released this year by the National Oceanic and Atmospheric Administration (NOAA). The WhaleWatch tool will help decrease whale mortality due to collisions with shipping and fishing gear. About a fourth of the roughly 12,000 blue whales in the world today live in the Pacific Ocean, said Mate. Most of them, along with other endangered whale species, migrate up and down the California coast – along with heavy fishing and shipping traffic to and from the ...

Read more
Page 17 of 25 1 16 17 18 25