Posted on January 15, 2015 by Bob Berwyn
New study shows acceleration in past 20 years
Coastal flooding along the Gulf Coast. bberwyn photo.
Sea level is going up, up … up.
FRISCO — Estimating the pace of global sea level rise isn’t easy, but a team of Harvard researchers say their new study helps fill in some of the data gaps, showing that the acceleration in the rise global sea level from the 20th century to the last two decades has been significantly larger than scientists previously thought.
Part of the reason for that is because scientists may have been over-estimating sea level rise between 1900 and 1990, according to co-authors Carling Hay, a post-doctoral fellow in the Department of Earth and Planetary Sciences, and Eric Morrow, a recent PhD graduate of EPS. Continue reading
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Posted on January 13, 2015 by Bob Berwyn
Massive flows contribute to sea level rise
How fast will the Greenland Ice Sheet melt?
Credit: NASA Goddard’s Scientific Visualization Studio.
FRISCO — After criss-crossing the Greenland Ice Sheet with a helicopter and deploying a remote-operated boat, a team of UCLA-led scientists say they’ve mapped an intricate network of rivers and streams flowing on top of the ice sheet.
The water from those rivulets and rivers could be responsible for as much, if not more, sea-level rise that the ice sheet’s ephemeral lakes and the monster chunks of ice that slide into the ocean to become icebergs. Continue reading
Filed under: Arctic, climate and weather, global warming, Greenland | Tagged: climate change, global warming, Greenland ice sheet, Greenland snowmelt rivers, sea level rise, UCLA | Leave a comment »
Posted on December 19, 2014 by Bob Berwyn
High water at the mouth of the Mississippi River, near Venice, Louisiana. bberwyn photo.
Study eyes flood ‘tipping’ points
FRISCO — Rising sea levels will subject many coastal areas in the U.S. to frequent flooding by the middle of the century, according to a new NOAA study aimed at identifying flood “tipping points.” By 2050, a majority of U.S. coastal areas are likely to be threatened by 30 or more days of flooding each year the study concluded.
The research was led by NOAA scientists William Sweet and Joseph Park and published this week in the American Geophysical Union’s online peer-reviewed journal Earth’s Future. Continue reading
Filed under: climate and weather, extreme weather, global warming | Tagged: climate change, flooding, global warming, global warming tipping points, sea level rise | Leave a comment »
Posted on December 15, 2014 by Bob Berwyn
How fast will the Greenland ice sheet melt?
243 gigatons of ice per year …
FRISCO — The most detailed look yet at the dynamics of the Greenland ice sheet suggests that current climate models may not be capturing the full extent of melting.
A team of scientists tracking the behavior of the ice sheet said they found unexpected shrinking in southeastern Greenland, and other signs suggesting that current models may underestimate ice loss in the near future. Continue reading
Filed under: Arctic, climate and weather, climate change, global warming, Greenland | Tagged: climate change, global warming, Greenland ice sheet, sea level rise | Leave a comment »
Posted on November 12, 2014 by Bob Berwyn
Detailed measurements to help pinpoint rate of ice shelf melt
Melting Antarctica ice shelves are raising global sea level. bberwyn photo.
FRISCO — The Southern Ocean, surrounding Antarctica, is mostly separated from the rest of the world’s oceans by a sharp temperature boundary and swift currents. But the border between the different masses of water is regularly blurred by giant swirls of water that may be transporting warmer water to the edge of the frozen continent.
Knowing how that process works could help scientists understand how fast Antarctic ice shelves will melt and raise global sea level, according to Caltech scientists who used robotic gliders to track the movement of water in the region. Continue reading
Filed under: Antarctica, climate and weather, Environment, global warming | Tagged: climate change, global warming, sea level rise, Southern Ocean, West Antarctic ice shelf | Leave a comment »
Posted on October 2, 2014 by Bob Berwyn
How fast will the Greenland Ice Sheet melt? Credit: NASA Goddard’s Scientific Visualization Studio.
New study probes role of subglacial runoff channels
FRISCO — Scientists continue to probe and poke at the Greenland Ice Sheet to try and figure out exactly how fast it will melt as global temperatures rise. In one of the newest studies, an international team drilled boreholes to measure melt rates and ice movements, finding that the story is even more complicated than we thought.
“Although the Greenland Ice Sheet initially speeds up each summer in its slow-motion race to the sea, the network of meltwater channels beneath the sheet is not necessarily forming the slushy racetrack that had been previously considered,” said Matthew Hoffman, a Los Alamos National Laboratory scientist on the project, which clarifies the evolution of the meltwater flow rates over the seasons. Continue reading
Filed under: climate and weather, global warming, Greenland | Tagged: climate change, global warming, Greenland ice sheet, sea level rise | 1 Comment »
Posted on August 29, 2014 by Bob Berwyn
Sea level is rising, and will continue to rise for centuries even if we cut greenhouse gas emissions.
Addressing non-climatic impacts will improve long-term resilience
FRISCO — From mountains, forests and rivers down to the seashore, a common theme among researchers is that, in many places, human impacts stemming from land use and development still outweigh the global warming signal.
That includes coastal regions, were there is an immediate need to tackle the threats from non-climatic changes, an international research team said this week after a detailed review of Intergovernmental Panel on Climate Change assessments. Continue reading
Filed under: climate and weather, Environment, global warming | Tagged: climate change, coastal adaptation, global warming, sea level rise | Leave a comment »