Sentences with phrase «radar observations of»

They expected to find a decline in ice thickness when they embarked on a study of radar observations of 402 lakes near Barrow in Alaska from the European earth resources satellites ERS - 1 and ERS - 2.

Homeyer's research is the first concept of its kind to take ground - based radar observations of storms and link them to satellite observations of trace gases to better understand the characteristics of storms and how they modify the atmospheric composition.

Radar observations of individual rain drops in the free atmosphere, Proceedings of the National Academy of Sciences, doi: 10.1073 / pnas.1117776109.

Recently, truck - borne Doppler radar observations of tornadoes (readers who watch tornado TV shows would be familiar with such devices) have identified a number of cases in which the radar - measured winds are considerably faster than the official NWS rating implies.

There is also some unconfirmed evidence of recent volcanism on Mercury, and radar observations of Mercury's north pole show evidence of water ice in the protected shadows of some craters.

Baggaley, W. J. Advanced meteor orbit radar observations of interstellar meteoroids.

«Radar observations of a relict ice stream margin traversing Siple Dome, Antarctica,»» Antarctic Journal of the United States, XXX (5), (in press).

The team is already using a preliminary shape model, produced from radar observations of the asteroid.

Not exact matches

Radar began with the observation that lightning gives off a radio signal, and Scottish engineer Robert Watson - Watt, working as a meteorologist, thought he could exploit this phenomenon to warn pilots of approaching storms.

Using satellite radar and helicopter observations, scientists at Laval University in Quebec and the University of Alaska at Fairbanks discovered that the more - than -150-square-mile Ward Hunt Ice Shelf on the north coast of Canada's Nunavut territory has split in half.

Moreover, the partnership with China will likely continue, and the two nations are considering the development of a new family of satellites using radar instead of optical instruments, enabling the observation of forests even through clouds.

However radar observations have shown that lakes cover only a few per cent of the surface and are concentrated near the poles, making Titan much drier than Earth.

The scarps directly expose bright glimpses into vast underground ice previously detected with spectrometers on NASA's Mars Odyssey (MRO) orbiter, with ground - penetrating radar instruments on MRO and on the European Space Agency's Mars Express orbiter, and with observations of fresh impact craters that uncover subsurface ice.

Instruments are now so precise that radar observations can spot a single bee at about 30 miles away, and scientists can combine thermal imaging cameras, acoustic monitoring devices and small portable radars with weather radar data to get a complete picture of a region's ecology.

«These scientists combined citizen science observations with data from radar, satellites and weather predictions to understand the cues birds use in their migrations across continents,» said Liz Blood, program director in the National Science Foundation's Division of Environmental Biology, which funded the research through NSF's MacroSystems Biology Program.

The Deep Space Network, managed by JPL, is an international network of antennas that supports interplanetary spacecraft missions and radio and radar astronomy observations for the exploration of the solar system and the universe.

The best explanation for these observations, says Butler, is that the radar - absorbing regions are vast plains of volcanic ash or pumice.

Twenty years ago, radar observations from Earth revealed small, highly reflective areas close to Mercury's poles, suggesting the presence of ice.

French credited modern technology with making the detailed cloud - seeding observations possible, citing the use of ground - based radar as well as radar on UW's King Air research aircraft and multiple flights over the mountains near Boise.

Visible light can't pierce Venus's thick shroud of clouds, so most of what astronomers know about the planet's surface comes from observations in radar and other wavelengths.

Concurrently with the radar imaging, the scientists also used the radar transmitter at the Arecibo Observatory in Puerto Rico and a portion of the antennas that are part of the National Radio Astronomy Observatory's (NRAO) Very Long Baseline Array (VLBA) to perform an observation known as radar speckle tracking.

In radar observations a few weeks apart it found evidence that methane showers had soaked the soil, then evaporated — the first proof of precipitation beyond Earth.

By comparing the repeat - pass radar observations, scientists hope to measure any crustal deformations that may occur between observations, allowing them to «see» the amount of strain building up on fault lines, and giving them a clearer picture of which faults are active and at what rates they're moving, both before earthquakes and after them.

«A lot of what we depend on is experience, but we need tools of the industry, such as Doppler radar and good observations» to solve mysteries related to weather, Lombardo says.

But previous radar observations viewed the apparent lakes at an angle, and therefore did not see bright radar glints reflected back from their surface, leaving open the possibility that the features were dry lake beds or patches of soot.

The find, based on new radar observations, adds to a deluge of evidence that the moon's lakes are indeed filled with liquid, rather than dried mud.

From satellite observations such as radar interferometry, Rignot and his colleagues conclude a common cause underlies the retreat of West Antarctica's largest glaciers, including Pine Island Glacier, known for cleaving massive icebergs, and its neighbor, Thwaites Glacier.

Finnish Meteorological Institute makes observations of the atmosphere, sea and space at over 400 stations around Finland, and using remote sensing instruments such as radars and satellites.

Water ice strongly reflects radar, and observations reveal that there are patches of very high radar reflection near the poles.

That maneuver, NASA told USA Today will be the probe's «final opportunity for up - close observations of the lakes and seas of liquid hydrocarbons that spread across the moon's northern polar region, and the last chance to use its powerful radar to pierce the haze and make detailed images of the surface.»

For example, the agency is partnering with the Indian Space Research Organization to develop the NASA ISRO Synthetic Aperture Radar (NISAR) mission that will routinely provide systematic observations of Earth's land and ice - covered surfaces at least twice every 12 days, enabling greater scientific understanding of the dynamic processes that drive the Earth system and natural hazards, as well as providing actionable support for disaster response and recovery.

Finnish Meteorological Institute has been doing estimates of two essential sea ice parameters — namely, sea ice concentration (SIC) and sea ice thickness (SIT)-- for the Bohai Sea using a combination of a thermodynamic sea ice model and Earth observation (EO) data from synthetic aperture radar (SAR) and microwave radiometer.

Radar observations find that about 80 percent of the surface is covered by lava flows with a few Australia - size uplands of two to five km (1.2 to 3.1 miles) high, and there are large shield volcanoes that rise above the plains as high as 11 km (6.8 miles)-- higher than Mount Everest's eight km (five miles) above Earth sea - level.

The densities and chemical compositions of the two rocky planets are also similar, and radar observations found that Venus has relatively few craters indicating a relatively young or quickly changing surface like Earth.

On May 3, 2007, team of astronomers (including Jean - Luc Margot; Stan Peale; Igor V. Holin; Raymond F. Jurgens; and Martin A. Slade) announced new evidence that Mercury has a partially molten core using new observations of fluctuations in Mercury's spin obtained with radar signals bounced off the planet from Earth (with the 305 - meter Arecibo, the 34 - meter Goldstone, and the 100 - meter Robert C. Byrd Green Bank radio telescopes).

Subtle dynamical motions measured by Earth - based radar, the observed parameters of its gravity field, and observations of the magnetic field indicate that Mercury's core is at least partially liquid with an active core dynamo.

The effort uses innovative ARM radar observations from the MC3E field campaign to evaluate a series of high - resolution simulations, which results in an improved understanding of cloud transitions and how to diagnose these transitions in models.

«Validation of GMI Snowfall Observations by Using a Combination of Weather Radar and Surface Measurements.»

The machine behind those observations is the Arecibo Observatory Planetary Radar, which is the most powerful device of its kind.

In 1965, Pettengill and Dyce determined Mercury's period of rotation to be 59 + - 5 days based upon radar observations.

Radar observations in the 1970s revealed details of Venus» surface for the first time.

Using satellite radar interferometry observations of Greenland, we detected widespread glacier acceleration below 66 - north between 1996 and 2000, which rapidly expanded to 70 - north in 2005.

The authors present the study as a test of Europe's earth observation satellite Sentinel - 1 and its ability to deliver radar measurements to accuracies of millimetres.

Radar systems; radar equation and applications; multiple Doppler observation and processing; radar studies of mesoscale syRadar systems; radar equation and applications; multiple Doppler observation and processing; radar studies of mesoscale syradar equation and applications; multiple Doppler observation and processing; radar studies of mesoscale syradar studies of mesoscale systems

Here, satellite radar observations are used to produce a composite picture of the life cycle of convection in these two regions.

A study using Earth Remote Sensing satellite radar interferometry (EERS - 1 and -2) observations from 1992 through 2011 finds «a continuous and rapid retreat of the grounding lines of Pine Island, Thwaites, Haynes, Smith, and Kohler» Glaciers, and the authors conclude that «this sector of West Antarctica is undergoing a marine ice sheet instability that will significantly contribute to sea level rise in decades to centuries to come» (Rignot et al. 2014).

Scientists from the University of Erlangen - Nuremberg Institute of Geography and from the Laboratoire de Glaciologie et Gophysique de l'Environnement in Grenoble, France, used radar data from satellites such as ESA's Envisat and observations of ice thickness from airborne surveys in a complex model to demonstrate, for the first time, how the buttressing role of the ice shelves is being compromised as the shelves decline.

Microwave radars of the European Remote - Sensing Satellites (ERS), radiometers of the Defense Meteorological Satellite Program (DMSP) and the dual - frequency altimeter TOPEX - POSEIDON have shown their ability to improve the description and location of storms, especially in the case of tropical cyclones for which very few traditional observations exist.

A comparison to observations (gauge and radar data) shows that the high - resolution (3 km) model generates better rainfall distributions on time scales from monthly to hourly than the coarse - resolution (9 km) model, especially along the west slopes of the Sierra Madre Occidental.

It costs little to field the observations — the satellites and the radars, the surface in situinstruments, etc. to monitor conditions and their changes; to assimilate the data into variety of numerical models, to run these and form ensemble averages; to disseminate the findings.