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World’s melting glaciers making large contribution to sea rise

By Guest PostMay 29, 2013Environmentalaska, alex gardner, antarctic ice sheets, arctic canada, clark university, climate experiment, coastal greenland, columbia glacier, contribution, glacier mass changes, grace, gravity recovery, greenland, icesat, john wahr, melting glaciers, NASA, sea rise, sea-level rise, tad pfeffer, the himalayas, the southern andes, university colorado boulder, university of michigan, world

While 99 percent of Earth’s land ice is locked up in the Greenland and Antarctic ice sheets, the remaining ice in the world’s glaciers contributed just as much to sea rise as the two ice sheets combined from 2003 to 2009, says a new study led by Clark University and involving the University Colorado Boulder.

The new research found that all glacial regions lost mass from 2003 to 2009, with the biggest ice losses occurring in Arctic Canada, Alaska, coastal Greenland, the southern Andes and the Himalayas. The glaciers outside of the Greenland and Antarctic sheets lost an average of roughly 260 billion metric tons of ice annually during the study period, causing the oceans to rise 0.03 inches, or about 0.7 millimeters per year. (more…)

‘A better path’ toward projecting, planning for rising seas on a warmer Earth

By Guest PostApril 30, 2013Environment21st century, Antarctica, basins, behavior, christopher little, climate change, climate change policy, coastal planning, computer algorithms, continental ice sheets, geosciences, greenland, ice sheet dynamics, ipcc, massive ice sheets, methodology, michael oppenheimer, monte carlo simulations, nathan urban, Nature, polar ice sheets, princeton university, projection, risk tolerance, sea level, sea level change, sparse data, upper bounds

More useful projections of sea level are possible despite substantial uncertainty about the future behavior of massive ice sheets, according to Princeton University researchers.

In two recent papers in the journals Nature Climate Change and the Proceedings of the National Academy of Sciences (PNAS), the researchers present a probabilistic assessment of the Antarctic contribution to 21st-century sea-level change. Their methodology folds observed changes and models of different complexity into unified projections that can be updated with new information. This approach provides a consistent means to integrate the potential contribution of both continental ice sheets — Greenland and Antarctica — into sea-level rise projections. (more…)

CryoSat-2 Mission Reveals Major Arctic Sea-Ice Loss

By Guest PostFebruary 18, 2013Environmentalfred wegener institute, aperture radar altimeter, Arctic, Arctic sea ice, assimilation system, autumn, canadian archipelago, cracks, cryosat 2 satellite, data, energy, european space agency, german aerospace center, greenland, high resolution, ice ocean modelling, ice thickness, icesat satellite, jet propulsion laboratory, katharine giles, microwave, modelling, NASA, pan arctic, piomas, polar observation, pulse, sea ice, seymour laxon, svalbard, synthetic, uk, university of washington, volume, york university

Arctic sea ice volume has declined by 36 per cent in the autumn and 9 per cent in the winter between 2003 and 2012, a UK-led team of scientists has discovered.

Researchers from the Centre for Polar Observation and Modelling at UCL used new data from the European Space Agency’s CryoSat-2 satellite spanning 2010 to 2012, and data from NASA’s ICESat satellite from 2003 to 2008 to estimate the volume of sea ice in the Arctic. (more…)

Study Shows Rapid Warming on the West Antarctic Ice Sheet

By Guest PostDecember 25, 2012Environmentandrew monaghan, Antarctic, Antarctica, below sea level, byrd station, climate change, contribution, data, david bromwich, discovery, earth, greenland, ice sheet, ice shelf, ice shelves, julien nicolas, larsen b, meteorological observation, ocean, ohio state university, polar night, sea-level rise, solar panels, southern hemisphere, surface melting, temperature, wais, wais glaciers, warming, west antarctic

COLUMBUS, Ohio — In a discovery that raises further concerns about the future contribution of Antarctica to sea level rise, a new study finds that the western part of the ice sheet is experiencing nearly twice as much warming as previously thought.

The temperature record from Byrd Station, a scientific outpost in the center of the West Antarctic Ice Sheet (WAIS), demonstrates a marked increase of 4.3 degrees Fahrenheit (2.4 degrees Celsius) in average annual temperature since 1958—that is, three times faster than the average temperature rise around the globe. (more…)

Fire and Ice: Wildfires Darkening Greenland Snowpack, Increasing Melting

By Guest PostDecember 13, 2012Environmentaerosols, Arctic, arctic wildfires, calipso, calipso data, colorado, computer models, dark snow project, environmental effect, evidence of smoke, greenland, greenland ice sheet, greenland landscape, high temperatures, ice melts, jason box, mckenzie skiles, melting in greenland, ohio state university, particle trajectories, polar ice, satellite observations, smoke clouds, summer, temperatures rise, thermal images, thomas painter, tundra fires

SAN FRANCISCO — Satellite observations have revealed the first direct evidence of smoke from Arctic wildfires drifting over the Greenland ice sheet, tarnishing the ice with soot and making it more likely to melt under the sun.

At the American Geophysical Union meeting this week, an Ohio State University researcher presented images from NASA’s Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) satellite, which captured smoke from Arctic fires billowing out over Greenland during the summer of 2012. (more…)

Climate Dialogue

By Guest PostNovember 19, 2012Environmentabrupt, adam rome, cleaner environment, climate authority, climate change, climate condition, climate dialogue, climate history, climate pattern, david w titley, earth future, earth past, environmental, environmental historian, future, geoscientist, greenland, ice core, indicator, mitchell hall, national security, pennsylvania state university, prediction, public awareness, rear admiral, richard alley, university of delaware

Renowned geoscientist Richard Alley shares climate history, predictions

About the video: Ice sheet expert Richard Alley told a UD audience about the past and future of Earth’s changing climate when he spoke as part of the DENIN Dialogue Lecture Series.

Richard Alley, Evan Pugh Professor of Geosciences at Pennsylvania State University, appeared at the University of Delaware’s Mitchell Hall on Nov. 8 to discuss his breakthrough findings about abrupt climate changes in Earth’s past and the implications of his research for Earth’s future. (more…)

On The Front Lines

By Guest PostSeptember 4, 2012Environmentandreas muenchow, Arctic, blog, canada, canadian icebreaker, delaware, extent, front lines, greenland, henry larsen, ice, ice cover, ice island, ice loss, icy seas, manhattan, marine scientist, melt cycle, multi year, nares strait, nsidc, petermann fjord, petermann glacier, sea ice, ud scientist, university

UD scientist sees Arctic ice loss firsthand

The extent of sea ice in the Arctic has reached a record low, according to data released Aug. 26 by the U.S. National Snow and Ice Data Center (NSIDC).

A University of Delaware marine scientist can confirm some of that ice loss firsthand. In a short video he produced, Andreas Muenchow, aboard the Canadian icebreaker Henry Larsen, shows the ice-free sea off Petermann Fjord that he and his colleagues were sailing in — an area that for ages had been covered by floating ice shelves. (more…)

American Eels Return to Mountain Streams after Dam Removal

By Guest PostAugust 1, 2012Environment, Naturealan weaver, american eel, anguilla rostrata, atlantic coast, dam, dam removal, embrey dam, endangered species, fredericksburg, freshwater eel, freshwater stream, greenland, hydroelectric power, jeb wofford, life cycle, migration barrier, mountain streams, nathaniel hitt, rappahannock river, sargasso sea, sheila eyler, shenandoah national park, south america, usgs, virginia

Shenandoah National Park, Va. – American eels are declining across their range but are showing indications of a population revival following the removal of a large dam in Virginia.

The removal of Embrey Dam on the Rappahannock River increased American eel numbers in headwater streams nearly 100 miles away, according to research just published by U.S. Geological Survey, U.S. Fish and Wildlife Service, and National Park Service researchers.

American eels undergo long-distance migrations from their ocean spawning grounds in the Sargasso Sea to freshwater streams along the Atlantic coast from northern South America to Greenland. Dams may slow or even stop upstream eel migrations. However, prior to this research, little was known about American eel responses to dam removal. (more…)

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