There’s no question that nuisance flooding is increasing along U.S. coasts due to sea level rise, and some coastal residents got their feet frequently during the past year, according to a new report from the National Oceanic and Atmospheric Administration.
In some cities, the days of nuisance flooding during the past meteorological year (May 2015 to April 2016) flooding exceeded trends and broke records, especially in the southeastern U.S and Gulf Coast. For those areas, the strong El Niño may have exacerbated the effects of rising sea level.
Wilmington, North Carolina, saw an all-time high of 90 days of nuisance flooding, nearly one quarter of the year. Other cities with record numbers of flooding days are Charleston, South Carolina; Port Isabel, Texas; Mayport, Virginia Key, Key West, and Fernandina Beach, Florida, the report said. Continue reading “El Niño & rising seas bring record nuisance flooding”→
June storms highlight impacts of rising seas, shifting storm patterns
Just after the Australian government announced massive cuts to the country’s science agency, researchers are warning that there’s more of a need then ever to track climate change impacts.
A series of recent storms that lashed Australia’s east coast are reminder that rising sea level presents a growing threat to coastal communities, according scientists with the University of New South Wales.
New research suggests that Antarctica’s contribution to sea level rise over the next few decades has been underestimated
By Bob Berwyn
When it comes to the question of how much sea levels will rise in the global warming era, Antarctica is the big, frozen, enchilada.
Just a partial meltdown of the ice shelves along the western fringe of the continent could raise sea level two to three feet in a few hundred years, and more extensive melting of inland ice sheets would send seas surging upward higher and faster than most coastal communities could adapt for.
Until recently, Antarctica’s inland ice fields were deemed as relatively stable, andrecent NASA research even suggested that global warming will increase snowfall over Antarctica and build more ice mass—a process that could slow melting and offset sea level rise.
ESA satellites offer clues about climate change consequences
An analysis of data from European Space Agency satellites shows that Antarctic ice shelves may be losing their buttressing role as they get thinner and retreat inland.
The findings, announced in February, used ice velocity data to show that there is a critical tipping point at which the shelves act like a restraining band, holding back the the ice that flows toward the sea. In a dramatic press release, the ESA said that, if the ice is lost, it could be “point of no return” for Antarctica’s ice.
The edges of Antarctic ice sheets may crumble and collapse much faster than most existing climate models suggest, potentially raising global sea level by as much as 50 feet in the next 500 years, according to researchers from Penn State and University of Massachusetts, Amherst.
Scientists are tracking yet another global warming feedback mechanism that will have dire consequences for coastal communities around the world. Melting sea ice and overall rapid warming in the Arctic are factors in the development of so-called blocking high pressure systems — air masses spinning clockwise that block cold, dry Canadian air from reaching Greenland.
The highs tend to enhance the flow of warm, moist air over Greenland, contributing to increased extreme heat events and surface ice melting, according to the study. That circulation pattern leads to more melting of the Greenland Ice Sheet, according to new research published online in the Journal of Climate last month, co-authored by Jennifer Francis, one of the pioneers in studying how global warming is affecting the jet stream. Continue reading “Climate: Jet stream shifts may speed Greenland meltdown”→
Erosion from beneath could lead to more sea-level rise
Oceans warming under a thickening blanket of greenhouse gases are licking at the edge of Antarctica and carving new channels in the bottom of ice shelves all around the frozen continent, researchers said this week in a new study led by scientists with the National Snow and Ice Data Center.
Those channels, characterized as “upside-down rivers” by the scientists, may make the ice shelves more prone to collapsing, which could speed up the flow of ice and the increase the rate of sea-level rise. Overall, some Antarctic ice sheets have thinned by about 18 percent and the rate of melting is accelerating, other research shows.