Topic: Arctic Ocean
Written by Tony Phillips
Washington, D.C. – Climate change is a global phenomenon, yet Earth scientists are keeping a wary eye on one place in particular–the Arctic.
“Polar regions are important for us to study right now,” explains Tom Wagner of NASA’s Earth Science Division in Washington DC. “They are changing rapidly.”
One of the most visible of signs of warming is the retreat of Arctic sea ice. Every year, sea ice waxes and wanes in a normal response to the changing of seasons; the annual sea ice minimum occurs near the end of northern summer. Since the 1970s, researchers carefully watched to see if the rhythm of Arctic sea ice would respond to global warming.
Written by Kate Ramsayer
Greenbelt, MD – Sea ice surrounding Antarctica reached a new record high extent this year, covering more of the southern oceans than it has since scientists began a long-term satellite record to map sea ice extent in the late 1970s.
The upward trend in the Antarctic, however, is only about a third of the magnitude of the rapid loss of sea ice in the Arctic Ocean.
The new Antarctic sea ice record reflects the diversity and complexity of Earth’s environments, said NASA researchers. Claire Parkinson, a senior scientist at NASA’s Goddard Space Flight Center, has referred to changes in sea ice coverage as a microcosm of global climate change.
Written by Tony Phillips
Washington, D.C. – Arctic sea ice coverage continued its below-average trend this year as the ice declined to its annual minimum on September 17th, according to the NASA-supported National Snow and Ice Data Center (NSIDC) at the University of Colorado, Boulder.
“Arctic sea ice coverage in 2014 is the sixth lowest recorded since 1978,” said Walter Meier, a research scientist at NASA’s Goddard Space Flight Center in Greenbelt, Maryland.
NASA researchers and National Snow and Ice Data Center reports Melting Season in Arctic lasting longer
Written by Maria-José Viñas
Washington, D.C. – The length of the melt season for Arctic sea ice is growing by several days each decade, and an earlier start to the melt season is allowing the Arctic Ocean to absorb enough additional solar radiation in some places to melt as much as four feet of the Arctic ice cap’s thickness, according to a new study by National Snow and Ice Data Center (NSIDC) and NASA researchers.
Arctic sea ice has been in sharp decline during the last four decades. The sea ice cover is shrinking and thinning, making scientists think an ice-free Arctic Ocean during the summer might be reached this century. The seven lowest September sea ice extents in the satellite record have all occurred in the past seven years.
Written by Carol Rasmussen
Pasadena, CA – Vigorous mixing in the air above large cracks in Arctic sea ice that expose seawater to cold polar air pumps atmospheric mercury down to the surface, finds a NASA field campaign. This process can lead to more of the toxic pollutant entering the food chain, where it can negatively affect the health of fish and animals who eat them, including humans.
Scientists measured increased concentrations of mercury near ground level after sea ice off the coast of Barrow, Alaska, cracked, creating open seawater channels called leads. The researchers were in the Arctic for the NASA-led Bromine, Ozone, and Mercury Experiment (BROMEX) in 2012.
Written by Alan Buis and Whitney Clavin
Pasadena, CA – NASA and British Antarctic Survey scientists have reported the first direct evidence that marked changes to Antarctic sea ice drift caused by changing winds are responsible for observed increases in Antarctic sea ice cover in the past two decades.
The results help explain why, unlike the dramatic sea ice losses being reported in the Arctic, Antarctic sea ice cover has increased under the effects of climate change.
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