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More storms like Sandy? Arctic ice loss amplified Superstorm Sandy violence

Date:
March 5, 2013
Source:
Cornell University
Summary:
Researchers have shown that the severe loss of summertime Arctic sea ice – attributed to greenhouse warming – appears to increase the frequency of atmospheric blocking events like the one that steered Hurricane Sandy into the US Northeast.

Hurricane Sandy destruction. Professor Charles Greene connects Superstorm Sandy to the severe loss of summertime Arctic sea ice.
Credit: Leonard Zhukovsky / Fotolia

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 Arctic sea ice -- attributed to greenhouse warming -- appears to enhance Northern Hemisphere jet stream meandering, intensify Arctic air 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 Coastal Sciences; 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 atmospheric phenomena 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 ocean waves 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 superstorm is at least as plausible as the idea that this storm was simply a freak of nature."


Story Source:

The above story is based on materials provided by Cornell University. The original article was written by Blaine Friedlander. Note: Materials may be edited for content and length.


Cite This Page:

Cornell University. "More storms like Sandy? Arctic ice loss amplified Superstorm Sandy violence." ScienceDaily. ScienceDaily, 5 March 2013. <www.sciencedaily.com/releases/2013/03/130305145133.htm>.
Cornell University. (2013, March 5). More storms like Sandy? Arctic ice loss amplified Superstorm Sandy violence. ScienceDaily. Retrieved July 31, 2014 from www.sciencedaily.com/releases/2013/03/130305145133.htm
Cornell University. "More storms like Sandy? Arctic ice loss amplified Superstorm Sandy violence." ScienceDaily. www.sciencedaily.com/releases/2013/03/130305145133.htm (accessed July 31, 2014).

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