Arctic ice loss amplified Superstorm Sandy violence

March 5th, 2013 by Blaine Friedlander in Earth / Earth Sciences
Arctic ice loss amplified Superstorm Sandy violence
Professor Charles Greene connects Superstorm Sandys to the severe loss of summertime Arctic sea ice.


Professor Charles Greene connects Superstorm Sandys to the severe loss of summertime Arctic sea ice.

(Phys.org) —If you believe that last October's Superstorm Sandy was a freak of nature—the confluence of unusual meteorological, atmospheric and celestial events—think again.

Cornell and Rutgers researchers report in the March issue of Oceanography that the severe loss of summertime —attributed to greenhouse warming—appears to enhance jet stream meandering, intensify mass invasions toward middle latitudes, and increase the frequency of atmospheric blocking events like the one that steered Hurricane Sandy west into the densely populated New York City area.

The article, "Superstorm Sandy: A Series of Unfortunate Events?" was authored by Charles H. Greene, Cornell professor of earth and atmospheric sciences and director of Cornell's Ocean Resources and Ecosystems program; Jennifer A. Francis of Rutgers University's Institute of Marine and ; and Bruce C. Monger, Cornell senior research associate, earth and atmospheric sciences.

The researchers assert that the record-breaking sea ice loss from summer 2012, combined with the unusual observed in late October, appear to be linked to global warming.

A strong atmospheric, high-pressure blocking pattern over Greenland and the northwest Atlantic prevented Hurricane Sandy from steering northeast and out to sea like most October hurricanes and tropical storms from the Caribbean. In fact, Sandy traveled up the Atlantic coast and turned left "toward the most populated area along the eastern seaboard" and converged with an extratropical cyclone; this, in turn, fed the weakening Hurricane Sandy and transformed it into a monster tempest.

Superstorm Sandy's extremely low atmospheric pressure and the strong high-pressure block to the north created violent east winds that pushed storm surge against the eastern seaboard. "To literally top it off, the storm surge combined with full-moon high tides and huge to produce record high water levels that exceeded the worst-case predictions for parts of New York City," write the researchers.

Greene, Francis and Monger add: "If one accepts this evidence and ... takes into account the record loss of Arctic sea ice this past September, then perhaps the likelihood of greenhouse warming playing a significant role in Sandy's evolution as an extratropical is at least as plausible as the idea that this storm was simply a freak of nature."

Provided by Cornell University

"Arctic ice loss amplified Superstorm Sandy violence." March 5th, 2013. http://phys.org/news/2013-03-arctic-ice-loss-amplified-superstorm.html