Sentences with phrase «data over sea ice»

It's hard to imagine how Cowtan and Way could determine with any degree of certainty how «the hybrid method works best over land and most importantly sea ice» when there is so little surface air temperature data over sea ice.

Not exact matches

«We can also combine that data with projections of sea ice, to predict how much more or less it will cost these animals to make a living over the next century,» Fischbach says.

That corresponds to a roughly 3 1/2 week shift at either end — and seven weeks of total loss of good sea ice habitat for polar bears — over the 35 years of Arctic sea ice data.

Pettersen is hopeful that, with more data analysis over longer periods of time, researchers will find more answers yet to account for the melting ice sheet and the subsequent sea level rise that has already had an impact on regions across the planet.

«The unmanned SRB buoy we built made it possible for the first time to generate continuous data on albedo and other properties of sea ice over a long period,» says Dr Gerland.

Satellites from NASA and other agencies have been tracking sea ice changes since 1979, and the data show that Arctic sea ice has been shrinking at an average rate of about 20,500 square miles (53,100 square kilometers) per year over the 1979 - 2015 period.

Scientists have decades of data documenting the bears, and Lentfer says that the bears» weights have been dropping over the past 25 years, indicating that they're having trouble hunting seals on sea ice.

The GRACE observations over Antarctica suggest a near - zero change due to combined ice and solid earth mass redistribution; the magnitude of our GIA correction is substantially smaller than previous models have suggested and hence we produce a systematically lower estimate of ice mass change from GRACE data: we estimate that Antarctica has lost 69 ± 18 Gigatonnes per year (Gt / yr) into the oceans over 2002 - 2010 — equivalent to +0.19 mm / yr globally - averaged sea level change, or about 6 % of the sea - level change during that period.

Data taken over the past decade indicate that when a lot of Arctic sea ice disappears in the summer, the vortex has a tendency to weaken over the subsequent winter.»

Over the past three decades, the summer Arctic sea ice extent has declined roughly 40 percent, and the ice has lost significant volume, according to data from the Polar Science Center.

A new paper that combines paleoclimatology data for the last 56 million years with molecular genetic evidence concludes there were no biological extinctions [of Arctic marine animals] over the last 1.5 M years despite profound Arctic sea ice changes that included ice - free summers: polar bears, seals, walrus and other species successfully adapted to habitat changes that exceeded those predicted by USGS and US Fish and Wildlife polar bear biologists over the next 100 years.

NEW evidence has cast doubt on claims that the world's ice - caps are melting, it emerged last night. Satellite data shows that concerns over the levels of sea ice may have been premature. It was feared that the polar caps were vanishing because of the effects of global warming. But figures from the respected US National -LSB-...]

And remember, the satellite data are one small part of a vast amount of data that overwhelmingly show our planet is warming up: retreating glaciers, huge amounts of ice melting at both poles, the «death spiral» of arctic ice every year at the summer minimum over time, earlier annual starts of warm weather and later starts of cold weather, warming oceans, rising sea levels, ocean acidification, more extreme weather, changing weather patterns overall, earlier snow melts, and lower snow cover in the spring...

In addition to extending ICESat's data record over land and sea ice, IceBridge will also help set the stage for ICESat - 2 by measuring ice the satellite will fly over.

Meanwhile, global sea ice has remained virtually unchanged for the last 30 years of satellite data, and has increased in the arctic over the last three years, making one wonder where the «enormous» heating is taking place.

They applied a new method that fills in missing temperatures over sea ice by combining satellite data for missing areas with a method known as «kriging,» which calculates missing data by checking nearby temperature station readings.

Actually Fielding's use of that graph is quite informative of how denialist arguments are framed — the selected bit of a selected graph (and don't mention the fastest warming region on the planet being left out of that data set), or the complete passing over of short term variability vs longer term trends, or the other measures and indicators of climate change from ocean heat content and sea levels to changes in ice sheets and minimum sea ice levels, or the passing over of issues like lag time between emissions and effects on temperatures... etc..

Arctic «sea ice extent has varied naturally over the decades with some Russian data suggesting similar or even greater ice loss in some local areas in the 1930s» — Analysis of Arctic ice: «Russian data shows that the [Arctic] ice was just as thin in 1940 as it is now.

The area of Arctic sea ice was nearly 30 % greater in August than a year ago, according to recent satellite data, though projections based on longer - term trends suggest the sea ice will continue its decline over time.

Only about 818,000 square miles of the ocean around Antarctica was frozen over with sea ice on March 1, according to data analyzed and published by the National Snow and Ice Data Center (NSIDice on March 1, according to data analyzed and published by the National Snow and Ice Data Center (NSIdata analyzed and published by the National Snow and Ice Data Center (NSIDIce Data Center (NSIData Center (NSIDC).

Snow depth over sea ice data You might be surprised to find out how few data on snow depth over sea ice exists (i.e., actual observations or measurements), apart from measurements that ringed seal researchers have collected.

Satellite data reveal how the new record low Arctic sea ice extent, from Sept. 16, 2012, compares to the average minimum extent over the past 30 years (in yellow).

Snow depth over sea ice in spring affects the hunting success of polar bears on ringed seal (Phoca hispida) pups, but the relationship is more complicated than you might think and there is less data on this phenomenon than you would believe.

Onshore measurements had to be used as a proxy for on - ice snow depth, since there are no data for snow depth over sea ice on Hudson Bay.

However the model structure, assumptions, and data assimilation methods, whatever their uncertainties and differences, are better than extrapolation or kriging over long distances or across land / sea / ice boundaries.

A look at the plotted data over the past 20 years tells us that the mean Antarctic sea ice has been solidly above the long - term mean:

This is such an utter non-story — amounting to no more than «NSIDC have another year's worth of winter Arctic ice data» — that the only reason we can see for the BBC giving it the time of day is to guard against the possibility that people start filling their pretty heads with silly notions that the extent of summer Arctic sea ice varies from year to year, and that while it seems to have been reducing a bit over the last few decades, it hardly follows that it spells the end of the world as we know it.

While Goddard's anecdotes are interesting there's plenty of more concrete compiled data covering the last 100 years, which suggest sea ice levels today are lowest for over 100 years:

The issue, beyond the core data representing but a single geospacial location and thus by itself not representative of the whole (and much larger) region in which it resides, is that the core is near the Greenland summit (in order to get the deepest profile of the ice possible) and therefore at an elevation of over 2 miles above sea level.

For example, satellite data provides estimates of the sea ice cover on the Arctic Ocean as well as weather patterns over the Arctic.

Historically, lack of satellite data directly over the North Pole has not concerned scientists; they have always assumed that the area underneath is covered with sea ice.

Using Envisat radar altimeter data, scientists from the Centre for Polar Observation and Modelling at University College London (UCL) measured sea ice thickness over the Arctic from 2002 to 2008 and found that it had been fairly constant until the record loss of ice in the summer of 2007.

Despite its areas of inaccuracy, near - real - time data are still useful for assessing changes in sea ice coverage, particularly when averaged over an entire month.

However, detecting acceleration is difficult because of (i) interannual variability in GMSL largely driven by changes in terrestrial water storage (TWS)(7 ⇓ — 9), (ii) decadal variability in TWS (10), thermosteric sea level, and ice sheet mass loss (11) that might masquerade as a long - term acceleration over a 25 - y record, (iii) episodic variability driven by large volcanic eruptions (12), and (iv) errors in the altimeter data, in particular, potential drifts in the instruments over time (13).

Ignoring the possible increase of «methane from permafrost» with warming for now, it appears that NSIDC data tell us a) that northern hemisphere snow cover has not shown any statistical change since the 1980s, b) that Arctic sea ice has shrunk since measurements started in 1979 and c) that Antarctic sea ice has grown gradually over this period.

The AARI charts therefore add significantly to our understanding of the variability of Arctic sea ice over the last 8 decades, and we recommend their inclusion in future historical data sets of Arctic sea ice.

OT, but just read (over at Neven's ASIB) that Walsh and co, at the University of Alaska Fairbanks, have done a massive data rescue, digitization and preparation job, to create an historical sea ice atlas of Alaskan waters.

IMO, the strongest argument for sea ice decline over the last decade for being unusual and at least in part attributable to global warming is this (from Polyakov et al.): The severity of present ice loss can be highlighted by the breakup of ice shelves at the northern coast of Ellesmere Island, which have been stable until recently for at least several thousand years based on geological data.