Sentences with phrase «ice data study»

Not exact matches

The researchers studied temperature measurements over the last 150 years, ice core data from Greenland from the interglacial period 12,000 years ago, for the ice age 120,000 years ago, ice core data from Antarctica, which goes back 800,000 years, as well as data from ocean sediment cores going back 5 million years.

The study uses data from two NASA missions — Operation IceBridge, which measures ice thickness and gravity from aircraft, and Oceans Melting Greenland, or OMG, which uses sonar and gravity instruments to map the shape and depth of the seafloor close to the ice front.

«The fact that now a large, ice - free area can be observed in the Weddell Sea confirms our theory and gives us another data point for further model studies,» says Dr. Martin.

«The study gives us a really good handle on how to approximate how much ice Greenland is going to lose in the coming century,» says Ted Scambos of the US National Snow and Ice Data Center in Boulder, Coloraice Greenland is going to lose in the coming century,» says Ted Scambos of the US National Snow and Ice Data Center in Boulder, ColoraIce Data Center in Boulder, Colorado.

«In any case, the results of our model study give a clear indication that the bipolar variability of sulfate deposits must be taken into consideration if the traces of large volcanic eruptions are to be deduced from ice cores,» says Dr. Krüger, «Several research groups that deal with this issue have already contacted us to verify their data through our model results.»

A new University of Washington study, with funding and satellite data from NASA and other agencies, finds a trend toward earlier sea ice melt in the spring and later ice growth in the fall across all 19 polar bear populations, which can negatively impact the feeding and breeding capabilities of the bears.

Overland recently co-authored a study predicting an ice - free Arctic summer in the first half of this century and said he will soon be releasing additional data projecting that an area 100 miles north of Alaska will witness open water five months out of the year by 2030, as opposed to the current two months.

Our study is significant because, while there are various different estimates for the start and end of the Little Ice Age in different regions of the world, our data show that the most extreme phases occurred at the same time in both the Northern and Southern Hemispheres.

Julienne Stroeve of the National Snow and Ice Data Center said the new study reaches the same basic conclusion she and her colleagues did in work published in 2007, although it relies on a new data Data Center said the new study reaches the same basic conclusion she and her colleagues did in work published in 2007, although it relies on a new data data set.

«Many people look at this ice - shelf data and will fit a straight line to the data, but we're looking at all the wiggles that go into that linear fit, and trying to understand the processes causing them,» said Fricker, who was Paolo's PhD adviser at the time the study was conceived.

Whereas most studies look to the last 150 years of instrumental data and compare it to projections for the next few centuries, we looked back 20,000 years using recently collected carbon dioxide, global temperature and sea level data spanning the last ice age.

A 2012 study in Nature, using satellite data from the ICESat mission from 2003 to 2008, sounded the alarm, reporting that ice shelves in the EAIS were now losing volume.

In effect, this UAV survey across the ablation zone of the ice sheet perfectly bridges the gap between people on the ground studying what's under their feet in just one part of the ice sheet, and the satellite data that shows what's going on across the entire ice sheet.

«This new, huge data volume records how the ice sheet evolved and how it's flowing today,» said Joe MacGregor, the study's lead author, a glaciologist at The University of Texas at Austin Institute for Geophysics (UTIG), a unit of the Jackson School of Geosciences.

(A separate group at the University of Texas published figures extrapolated from GRACE data showing that Greenland lost as much as 57 cubic miles of ice each year between 2002 and 2005; NASA shortly plans to publish data reconciling the two studies.)

«We analysed the satellite data to determine how far the ice in that particular area has travelled,» says AWI biologist and co-author of the study, Hauke Flores.

In addition, both studies have yielded valuable data that can be integrated into ecosystem models — which are in turn essential to forecasts of how the retreat of sea ice will affect the Arctic ecosystem.

The researchers studied water samples taken during cruises by Chinese ice breaker XueLong, (meaning «snow dragon») in summer 2008 and 2010 from the upper ocean of the Arctic's marginal seas to the basins as far north as 88 degrees latitude, just below the North Pole, as well as data from three other cruises.

In a complementary study, planetary scientists Terrence Johnson of NASA's Jet Propulsion Laboratory in Pasadena, California, and Jonathan Lunine of the University of Arizona, Tucson, used Cassini data to calculate the relative proportions of rock and ice inside Phoebe.

By combining satellite images of the ice sheet and wind stress data from observations and computer modeling, Greene and his collaborators were able to study the chain of events that brings the warm water to Totten.

«In our study we used satellite data for sea ice and sea surface temperatures to run some coordinated hindcast experiments with five different atmospheric models,» Ogawa says.

The retreat of sea ice in the Arctic Ocean is diminishing Earth's albedo, or reflectivity, by an amount considerably larger than previously estimated, according to a new study that uses data from instruments that fly aboard several NASA satellites.

In addition, Hugelius and Schaedel are members of a network of scientists studying permafrost carbon in the Arctic, and Griffith is leading a new project by NASA in which scientists will fan out across the Arctic over the next decade to obtain more data on soil carbon and ice.

The study, by an international team of scientists led by the University of Cambridge, examined how changes in ocean currents in the Atlantic Ocean were related to climate conditions in the northern hemisphere during the last ice age, by examining data from ice cores and fossilised plankton shells.

Marine geologist Karin Andreassen at CAGE, the study's lead author, says the data could hold lessons for retreating ice sheets in West Antarctica and Greenland, although her team could not determine how much methane actually escaped into the atmosphere from blowouts in the distant past.

Although the robot didn't offer a glimpse of anything living there — it's not equipped with cameras or a sampling arm — it did provide invaluable data for scientists studying the swift - moving Pine Island Glacier ice shelf, which might be thought of as ground zero for the biggest Antarctic mystery of all, in the minds of many scientists: What is happening to the ice?

Scientists are involved in the evaluation of global - scale climate models, regional studies of the coupled atmosphere / ocean / ice systems, regional severe weather detection and prediction, measuring the local and global impact of the aerosols and pollutants, detecting lightning from space and the general development of remotely - sensed data bases.

For the new study, Thomas Rackow and his colleagues fed actual position and size data of 6,912 Antarctic icebergs into the Finite Element Sea Ice - Ocean Model FESOM, which they combined with a dynamic - thermodynamic iceberg model (both of which were developed at the AWI).

Data is also related to new manuscript being submitted to Annals of Glaciology titled: «Instruments and Methods: A case study of ice - core bubbles as strain indicators» (John M. Fegyveresi, Richard.

«As more studies are done in Iceland, with better equipment (and hence better data), I would not be surprised to see more robust and convincing evidence of increases in magma production and / or eruptions in Iceland as the current ice caps shrink further.

In the first comprehensive satellite study of its kind, a University of Colorado at Boulder - led team used NASA data to calculate how much Earth's melting land ice is adding to global sea level rise.

The new estimates are reasonable considering the rates of glacier change scientists are seeing at the moment, says Dr Ted Scambos, lead scientist at the National Snow and Ice Data Center, who wasn't involved in the study.

These data are part of a survey of interstellar ices in a sample of low - mass YSOs studied in earlier papers in this series.

One of the limitations to understanding exactly how and why Antarctic sea ice is changing is the relatively short length of satellite data records, says Dr Jonathan Day, co-author of the new study published in The Cryosphere.

A 2008 study led by James Hansen found that climate sensitivity to «fast feedback processes» is 3 °C, but when accounting for longer - term feedbacks (such as ice sheet disintegration, vegetation migration, and greenhouse gas release from soils, tundra or ocean), if atmospheric CO2 remains at the doubled level, the sensitivity increases to 6 °C based on paleoclimatic (historical climate) data.

The temperatures at and near the equator are generally too high to support ice at the surface for a long time, study authors say, but data from Dawn's next orbit will reveal more details.

It is important to regard the LGM studies as just one set of points in the cloud yielded by other climate sensitivity estimates, but the LGM has been a frequent target because it was a period for which there is a lot of data from varied sources, climate was significantly different from today, and we have considerable information about the important drivers — like CO2, CH4, ice sheet extent, vegetation changes etc..

The authors of a new study reviewing the volume data, detailed on Monday in the journal Nature Geoscience, are quick to caution, though, that one single year of rebound doesn't suggest any sea ice recovery, as the overall trend is still downward.

Using satellite images and other data, the team studied the edge of the former Laurentide Ice Sheet, a vast expanse of ice that covered two - thirds of North America during the last ice aIce Sheet, a vast expanse of ice that covered two - thirds of North America during the last ice aice that covered two - thirds of North America during the last ice aice age.

Be that as it may, all these studies, despite the large variety in data used, model structure and approach, have one thing in common: without the role of CO2 as a greenhouse gas, i.e. the cooling effect of the lower glacial CO2 concentration, the ice age climate can not be explained.

Conservative tracer studies using stable oxygen isotopic data from 307 sites show that while the entire surface of this area receives abundant freshwater from meteoric sources, freshwater from sea ice melt is most closely linked to the areas of carbonate mineral undersaturation.

al conducted an extensive study on the Vostok ice core data examining centennial events.

This study concluded the sample resolution of the Vostok ice core data can detect centennial scale cycles.

Data from the study found that 74 percent of single Americans believe small talk is worthwhile because it helps break the ice and provides basic information about a potential date.

Amidst the continuous chatter in the blogosphere about the strengths and limitations about «multiproxy» studies, these studies may be a refreshing return to simpler methods relying on just one type of «proxy»: data from ice cores.

The data (back to 1979) suggest that snow cover has not been declining at the rate of sea ice and this study could be an explanation of that.

Mike's work, like that of previous award winners, is diverse, and includes pioneering and highly cited work in time series analysis (an elegant use of Thomson's multitaper spectral analysis approach to detect spatiotemporal oscillations in the climate record and methods for smoothing temporal data), decadal climate variability (the term «Atlantic Multidecadal Oscillation» or «AMO» was coined by Mike in an interview with Science's Richard Kerr about a paper he had published with Tom Delworth of GFDL showing evidence in both climate model simulations and observational data for a 50 - 70 year oscillation in the climate system; significantly Mike also published work with Kerry Emanuel in 2006 showing that the AMO concept has been overstated as regards its role in 20th century tropical Atlantic SST changes, a finding recently reaffirmed by a study published in Nature), in showing how changes in radiative forcing from volcanoes can affect ENSO, in examining the role of solar variations in explaining the pattern of the Medieval Climate Anomaly and Little Ice Age, the relationship between the climate changes of past centuries and phenomena such as Atlantic tropical cyclones and global sea level, and even a bit of work in atmospheric chemistry (an analysis of beryllium - 7 measurements).

Not to mention that we KNOW levels of CO2 are higher than they have been in hundreds of thousands of years, and data from dendrochronology and ice core studies prove that high levels of CO2 are correlated with higher temperatures.

Ignatius Rigor of the University of Washington notes that the animation from the University of Colorado illustrating my earlier post — like his own ice studies — is a simulation drawing on limited buoy data, so specific features (like a transient blob of open water in 1999) are not cast in stone.

The highly accurate ice core data sets rathr precise dates for three major (and tropical) eruptions for which previous studies by traditional methods of paleogeology gave only poorer approximations.